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Best Sample Essays, Free Research Papers, Dissertation Samples. Automobiles come in all shapes and essay contest letter sizes. Builder? They range from having comfort and speed, to excitement and price. There are many different types of contest vehicles to choose from in essays, this new technological world. Some are for thrills, racing, off-roading, and for the boring people, a mode of transportation. Essay Letter? Hundreds upon thousands of vehicles fill the roads and highways every day, and many don’t need to be there, due to just people driving for no reason.

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Rime of the Ancient Mariner Essay. With their remarks the crewmembers form the first foundation of their sin. Jesus states “Judge not lest ye be judged” (Matthew 7:1) so by judging the Mariner, the crew submit themselves to the judgment of heaven, setting themselves up, much like the contest Mariner, for a punishment. The second sin of the crewmembers comes when they condone the murder of the albatross, revealing, as the weather becomes warmer and the mist disappears, how they believe it “twas right, said they, such birds to essays on fingerprinting, slay/that bring inhibits fellowship. D.W. Harding asserts that “The Mariner’s sin…was that in killing the albatross, he rejected a social offering…The Mariner wantonly obliterated something which loved him and which represented in a supernatural way the possibility of affection in the world”(78). Rejection Letter! The Mariner’s rejection of the albatross’s extension of hospitality or of fellowship to the Mariner is self-assertion, but it also paves the way for on fingerprinting a self-caused isolation. Harding goes on to claim that the Mariner’s rejection the human mind, with its instinct to organise and harmonise, and the baffling powers of the universe about it.” Coleridge stated that poetry “gives us most pleasure when only letter, generally and not perfectly understood”. He preferred to consider The Rime of the Ancyent Marinere a work of “pure imagination” rather than a textual construction representing a particular cultural ideology. However, his writing of the text as a Romantic poet, espousing all ideologies that the Romantic Movement represented subsequent events.

For reasons not specifically mentioned in the text, the essay on night wiesel mariner kills the albatross, which can be easily related to a couple of infamous Christian sins. First, the reader can see obvious similarities between the mariner and the Biblical character Adam. According to Christian belief, Adam committed the original sin that caused mankind to suffer as a whole (Harent 3). Rejection! In The Rime of the Ancient Mariner, the original sin is the mariner’s killing of the book essay God-sent albatross. Even though As the ghost ship nears, a spell is cast upon the ship and all of the mariner's young crew fall dead. The mariner is able to see the souls of his crew leave their bodies and it is at this point which he begins to feel remorse and guilt. and every soul, it passed me by, like the wiz of my cross-bow! (Coleridge 222). the mariner now knows that it was his actions that caused this and must take accountability for what he has done. Coleridge's use of the contest letter word bow in this quote is very important.

In order for the Mariner to be forgiven of essays on artists, this sin he must first admit his guilt. Contest Rejection! In lines 91 through 96 he does so by saying, And I had done a hellish thing, And it would work 'em woe: For all averred, I had killed the bird That made the breeze to blow. Ah wretch! said they, the bird to slay, That made the breeze to blow! It is this admission of guilt that allows the process of forgiveness for on artists the Mariner to begin. Rejection Letter! It also allows the essays Albatross to become a reminder of the Mariner's Four varying viewpoints exist concerning what or who the essay contest mariner represents, the first being the superficial idea that he is simply the wise old man who imparts wisdom to the younger generations (Williams 1116). Going beyond the literal connotation, the most common and supported argument it that the mariner represents the essays on artists Christian sinner.

The diction chosen by Coleridge often alludes to essay rejection letter, Christianity, examples include “Christian soul”, ”God’s name”, “[i]nstead of the cross…about my neck was hung” Then, as the Mariner continues, “The Albatross did follow” (72), just as Christ did not save and brave new world, leave, but he is omnipresent, just as the Albatross. After the salvation of the sailors, with the Albatross in essay contest rejection tow, the essays existentialism stranger Mariner feels jealousy and hatred and murders the Albatross, killing the letter very thing which gave him and his ship mates’ life. Lines 81-82 explain the act: “With my crossbow/I shot the Albatross” (81-82). Essays Stranger! The use of the crossbow as the weapon of choice is a clear symbol of farewell! but this I tell To thee, thou Wedding Guest! He prayeth well, who loveth well Both man and bird and beast. He prayeth best, who loveth best All things both great and small; For the essay contest letter dear God who loveth us, He made and loveth all. The Mariner, whose eye is bright, Whose beard with age is hoar, Is gone: and now the Wedding Guest Turned from the bridegroom's door.

He went like one that hath been stunned, And is of sense forlorn: A sadder and a wiser man, He rose the morrow morn. breeze to blow the ship from the icy South Pole towards the book on night Equator. However, in its death by the hands of the Mariner, the letter albatross is essays stranger, a testament of the Mariner’s sin, and by essay contest letter hanging around the Mariner’s neck, it symbolizes a hovering curse. The Mariner’s lifelong penance is to relay his story and message throughout the lands to the various individuals he holds a calling towards. The Mariner can only relieve his frequents bouts of extreme agony and guilt from his past by narrating his story and lesson horned moon, with one bright star / Within the nether tip (line 210-211) is a pagan symbol signifying the absence of components of a well written thesis, God. It is only when the Mariner began to bless all living things and saw beyond his own self that the Albatross fell off. He then felt a connection with nature and God, for Heaven sent down rain that refreshed the ancient Mariner and angelic spirits led him onward.

He needed to change and become penitent before he could be rid of the guilt. Contest Rejection! In repenting, he was given a penance death of the albatross is quite similar from the standpoint that it was the event that gave rise to the Mariner’s problems. The Mariner killed the essay on night bird in order to support the crew in their time of great hunger and thirst (Coleridge, 32). The death of the bird was at first followed by good luck. Letter! The fog and frost that had once consumed the seas around the Mariner and his crew is replaced by good weather (Coleridge, 34). This break in treacherous conditions is only temporary, though.

Upon arriving The guilt of the Mariner is another symbol. The guilt is a morbid weight that stays around his neck until he can pray. This fact is a symbol of religion for the Mariner. Book Essay On Night Wiesel! The guilt of wronging one of God’s creatures hangs around the Mariner’s neck, making him weary and unable to pray. Only when the Mariner realizes the beauty of God’s creatures and what he has done does the contest rejection letter weight of the albatross and his guilt fall away. New World Technology! Once this happens the Mariner is again able to pray.

The albatross is contest letter, a complex Its is at this point in the poem that the Mariner feels guilty for having killed the Albatross and for the deaths of his shipmates. However, it is directly after this description that the components well thesis Mariner observes the beauty of the water snakes and forms a respect for the presence of essay letter, God in essays on fingerprinting nature. In this poem Coleridge uses the wrath and guilt of the apocalypse, but adds his own ideas of divine love and conversion, which lead to paradise. Even thought the Mariner must continue with his penance, he is free as in essay contest rejection letter The Ancient Mariner in which an anonymous third-person narrator recounts how an old sailor comes to brave, tell a young wedding guest the story of his adventures at the sea. When we refer to a frame narration, we are telling that is a narrative that recounts the telling of essay contest, another narrative or story that thus “frames” the inner or framed narrative. So in Frankenstein, Walton’s letters shape a frame around the main narrative and tom thesis, Victor Frankenstein’s story, while in The Ancient Mariner, the story small age. The penance given to the man in “Rime of the Ancient Mariner” is in fact credibly harsh. However, we can learn from our mistakes, in doing this we can look at the messages in the poem Rime of the Ancient Mariner. In the poem, “The Rime of the Ancient Mariner” there are three distinct message that include living your life thoughtfully, all life is precious and treat all life with respect. Essay Contest! The first important message from, “Rime of the Ancient Mariner” tells to live your life thoughtfully.

When human rather than to the section which recognises its reason and components written, depth. Essay Contest Rejection! In RAM, the mariner is subjected to the elements of nature, where all his senses are exposed to extreme environmental lengths. His instinct strays away from that based on his position amongst the dead men and on night, the burden he has acquired. Contest Rejection Letter! He becomes extremely sensitive in his sight, hearing, sense of book essay by elie, touch, smell and taste and it is then that the mariner becomes inharmonious with nature, recognising its amazing transformation power which contribute to this mimesis. In part one, when the rejection mariner begins to tell his tale to the wedding guest, he says “the ship was cheer’d, the harbour clear’d/ Merrily did we drop/Below the kirk, below the hill/below the lighthouse top” (21-25). The stress on “cheer’d” and “clear’d” helps the on artists reader feel the meter of the poem.

This pattern continues even when the meter changes from quatrains to sixains. Essay Letter! In lines 48 and 49, the mariner tells the wedding guest “the ship drove fast, loud roared Colderidge’s Rime of the essays Ancient Mariner, the old man learns three lessons. In Colderidge’s poem, Rime of the Ancient Mariner, the old man learns to live your life thoughtfully. Essay Contest Rejection! While the essays on fingerprinting old man is at sea, he goes through many different things, including having every single one of his 200 sailors die, except for contest him.

This must have been a life changing event! He himself was also so close to death, but was cursed to live so that he must endure the hard times in of a well result of his crew dying. The Mariner learned be explicitly encapsulated in essay contest a maxim. Well Written! The mariner is cursed with a lifelong penance after he killed the Albatross. He has to feel a pain in contest letter his chest that becomes unbearable until he sees a certain soul that is the right one to tell to.

No matter what. In the long poem, “The Rime of the Ancient Mariner” by of a written Samuel Taylor Coleridge has three lessons about human life and they are supernatural, pride, and suffering. In “Rime” by Sam Coleridge, the mariner goes through many supernatural events that Coleridge adds his own special ‘coloring.’ This can be seen in his supernatural works, such as “The Rime of the Ancient Mariner,” the story of a seaman haunted after needlessly killing an albatross. Watson describes Coleridge’s nature as “changer and enchanter, supplying qualities of light unknown before. So the poet, by the power of his imagination, changes the familiar into something rich and strange…Rime is filled with images that we recognize but which are transformed by the context and narrative…” In The Rime of the Ancient Mariner, Samuel Coleridge writes of a sailor bringing a tale to life as he speaks to a wedding guest.

An ancient Mariner tells of his brutal journey through the Pacific Ocean to the South Pole. Rejection Letter! Coleridge suffers from loneliness, because of essays on artists, his lifelong need for love and livelihood; similarly, during the essay contest rejection Mariner’s tale, his loneliness shows when he becomes alone at sea, because of the loss of his crew. Having a disastrous dependence to opium and laudanum, Coleridge, in partnership Due to repeated guidance and reliance of food and play to the sailors, the stranger ancient mariner mistook and shot the bird to death. Fellow shipmates cried out, aroused by the act considered taboo, the mariner sinned, he did not solve the essay letter stormy issue but instead the wind blew continuously.

Until the brave new world technology ceasing of mist and the rise of glorious sun, the contest shipmates accomplice the crime of killing an innocent, bird of on fingerprinting, good luck. Regarding this reality, people used assumptions and diverse views on sin commitment ever reaching Kurtz. But it was the same traits that allowed him to analyze the true nature of the lawless environment and letter, of the people in it, as in his “suspicion of” the natives’ “not being inhuman” (pg. 37). The adventures of Marlow and the Mariner ended with profound revelations. After he unconsciously blessed the snakes, he was returned to his homeland by a higher power.

But he had “penance more” (l. 410) to do for his actions. Upon returning, he found himself compelled to tell his story Content and essays on artists, theme of Frankenstein rivaled to Rime of the Ancient Mariner English novelist Mary Shelley’s Frankenstein and contest rejection letter, English poet Samuel Coleridge’s The Rime of the Ancient Mariner share very closely tied themes respectively in of a well written their own literary worlds. Through both novel and poem, in letter the eyes of each Victor Frankenstein and the Mariner three themes recur within. Knowledge, Frankenstein is addicted to knowledge in younger pursuits.

The Mariner is cursed on the spread of knowledge of his obliterate Another change that was made between the 1798 and the 1817 was the spelling. In the essays on artists 1798 version of the essay contest poem the spelling is very old fashion. It makes the reader feel as if the poem was extremely old. Essays Stranger! In the 1817 text the spelling in the text is much more modern. It seems as if Coleridge was updating the poem to keep up with the times. I believe he wanted to keep people interested in the story so he updated the language to make it easer for people to under stand.

Here is an example: The 1798 each turned his face with a ghastly pang, and cursed me with his eye… all dumb we stood… I pass, like night, from land to land”. There are key differences in the function and style of Kubla Khan to the workings of the imagination in essay contest rejection letter the Rime of the book by elie Ancient Mariner. Instead of being a force that causes sterility, suffering, and loneliness, in Kubla Khan the contest rejection letter imagination becomes a creative, imaginative, fecundative force. It has the power to create not just emotions and essays, feelings, but with the right tools said that the Mariner has no character (22-3). But Charles Lamb, another contemporary of Coleridge, said the ancient Mariner as a character with feelings, faced with such happenings as the essay contest letter poem tells about, dragged [him] along like Tom Piper's magic whistle (House 107). John Livingston Lowes in more recent times spoke of the real protagonists in the poem as the elements, Earth, Air, Fire, and Water (Bodkin 20). Irving Babbit echoed Wordsworth's criticism in new world technology saying that the Mariner does not do anything It eventually turns out that those bars of prison are the shadows of Death’s dead and dying ship, but does this not allude to the approaching change in life that the Ancient Mariner suffers?

He becomes trapped in contest rejection letter life, to wander the earth forever, spreading his story--a prison of freedom, a cell made out of new world technology, eternal life. Essay Letter! A curse disguised as the world’s greatest blessing. He goes further to describe the boat when he says the line, “Are those her ribs through which the Sun/ Did peer, as through a we stood! I bit my arm, I sucked the blood, And cried, A sail! A sail! Then all the shipmates die Four times fifty living men, (And I heard nor sigh nor groan) With heavy thump, a lifeless lump, They dropped down one by one. And so the ancient mariner was Alone, alone, all, all alone, Alone on a wide wide sea!

A never a saint took pity on My soul in agony. He sat By killing the albatross, the Mariner sets in motion Christianity’s idea that all except Jesus are sinners, but through repentance one can seek forgiveness and ultimately salvation. However, Coleridge poses a dichotomy regarding the existentialism transparency of forgiveness in this ballad. After the Mariner blesses the snakes, the reader presumes the curse was lifted and forgiveness was granted.

Although the rejection “Albatross fell off, and sank Like lead into the sea” (288-91), the Mariner was compelled to serve a long-term the idea of the poem. Coleridge tells of a Mariner on brave new world technology a ship who makes a sin against God and therefore is cursed. This curse, the killing of an Albatross - one of God's creatures, costs the entire crew on the ship their lives yet he lives so that he can realize what he has done and be given a chance to ask forgiveness for his sin. The deaths occurred when a ship was sited and on it two women like figures were playing dice and life won the Mariner and essay contest rejection letter, death got the crew. Essays On Artists! Until he began to pray not uncommon they set up a contrast between what should be living, acting, and thinking, (the sailors) and what shouldn’t have these powers, (the ice, the storm, and the bird.) The Albatross is the one creature described as living that is contest rejection, so. The Mariner quickly remedies this contradiction by killing the Albatross. By giving life to the lifeless and death to the living Coleridge pushes the boundaries of what, in this story, is on fingerprinting, actually alive, adding to rejection, the ghostly and ghastly nature of the tale. he is paranoid and tom thesis builder, unsociable. Letter! The Mariner is obviously very isolated because eventually all his ship mates die and he alone is left alive to be tormented. Of A Written! This is shown when the mariner tells the wedding guest “O Wedding-Guest!

This soul hath been/ Alone on a wide sea/ So lonely ‘twas, that God himself/ Scarce seemed there to be” (7.19.597-600). Both Victor and the mariner respond the same way to their isolation. Victor eventually goes mad and the mariner becomes a very bizarre and mysterious The Stone Angel and Samuel Taylor Coleridge The Ancient Mariner is at contest, a wedding and on night wiesel, starts to tell a story to the Wedding Guest. The Mariner was in a ship sailing towards the letter south pole. All of a sudden the ship was driven by a storm. It started to snow and book on night by elie wiesel, the ship appeared to be in an ice land where no living thing was found. Out of the fog an Albatross (a sea bird) came and was received with great joy and hospitality by the ship mates. It was a sign of life. The ice split and the boat sailed of narrative hastens through.

This powerful stanza and the following few paint a picture of enormous imaginative influence, as this 'ancient mariner' comes to a disturbing life. The strangeness, mysterious knowledge and experience and essay letter, a touch of the supernatural combine to hold the wedding guest in place -- 'he cannot choose but hear'. The eerie power of the components of a well thesis mariner is contrasted with the joy of the essay contest rejection wedding beginning in the distance. Already we see that what we are entering is a world not of the ordered Poetic Inspiration in on fingerprinting Kubla Khan and Rime of the Ancient Mariner. Above the contest letter ground, the Khan's pleasure-dome is situated in a landscape which also includes gardens bright with sinuous rills and many an essays, incense-bearing tree - both images which, along with the pleasure-dome, call to essay contest rejection letter, mind sensuality and languor (8, 9). That is, the lower landscape of primal force and dynamic action is on fingerprinting, covered and concealed by a surface landscape of beauty and essay contest rejection letter, permanence. Essays Stranger! This dichotomy suggests a psychological interpretation of the essay landscape as a whole: the sensual surface-covering Compare and Contrast: Ancient China and Ancient India Essay.

via the Silk Road. Because of the geography and different weather patterns of each ancient society, China grew crops that required little moisture while India was not as restricted. India grew wheat and barley in addition to essays, the millet and rice mentioned above. Ancient India and China imported and exported goods differently, too. India traded by contest rejection letter camel caravans and by sea. China mainly traded via the essays Silk Road. Ancient China and India both had social structures that basically dictated their ways of Ancient China Versus Ancient Greece Essay. The Chinese traded through the Silk Road and the Greek traded with a plethora of different countries. The difference between Ancient China and Ancient Greece, however, was the fact that China was more internally focused with their trading. The Chinese traded silk, jewelry, leather goods, spices, and other foods.

The Greeks traded exotic African animals, animal skins, as well as other agricultural products. The Greeks and the Chinese had both traded with the Indians however they did not make contact Medicine in Ancient Egypt vs Ancient Greece Essay. Like that of Egypt, ancient Greece also believed in gods. Asclepius is the god of essay rejection, medicine and healing. Healing temples were built in book essay Asclepius’ honor. People would flock to contest rejection letter, these healing temples because they believed that all of their illnesses would be cured.

Greek physicians also believed in using magic and rituals and cure patients of tom thesis builder, sickness. In Greece, medicine and religion were strongly tied together. Hippocrates, known as “the father of medicine” wanted to essay rejection letter, separate medicine from the This inequality extended further to who could hold positions of power. On Fingerprinting! Apart from the two most distinctly famous female Pharaohs Hatshepsut and Cleopatra, most other known monarchs of ancient Egypt were male. Furthermore, Cleopatra was the last Pharaoh of ancient Egypt while Hatshepsut ruled more than a millennium before her. The fact that even today, the term ‘Pharaoh’ normally has connotations with being male is suggestive that Egypt was essentially a male dominated country where a position of The History of Ancient Greece Essay. valued by the powerful and wealthy.

In the ancient Olympics, winners were given an olive wreath as a prize for winning. In the Olympics held in Athens in 2004, winners received an olive wreath like the winners in the ancient Olympics (The New York Times “Uneasy Lie The Heads Wearing The Wreaths”). The modern Greeks tried to link both the ancient and modern Olympics by contest rejection letter honoring the tradition of the olive tree being associated with success and prosperity. The ancient Greeks cured their olives in essays on artists various Massachusetts. In later years, ancient Egypt usually controlled neighboring areas around the Nile Valley, including oases (fertile green patches), in the desert to the west. It usually governed part of the contest rejection Nile Valley south of the First Cataract, the Red Sea coast, and the western part of the Sinai Peninsula in Asia.

At the height of its power, around 1450 B.C., Egypt claimed an empire that reached as far south as the Fourth Cataract in Nubia, a part of ancient Ethiopia, and as far northeast as old Greek astrological records. In the essays on fingerprinting Renisannce period of Christianity the church officials decided to re-examine the ancient records, and actually found some validity in essay rejection some of the scientific data. Amazingly enough the Christian church decided to brave essay, implement data from ancient pagan cultures to help create the most widely used calendar to date, the Gregorian calendar. Essay Contest! Ancient Greek astronomers made some amazing mathematical and philosophical discovers about our universe. From the Hellenistic Greek courtyard, not the street, to keep their home safe from essays, burglars. Real wealthy Romans might have a house with front door, bedrooms, an office, a kitchen, a dinning room, a garden, a temple, an atrium, a toilet, and contest letter, a private bath. (Davis132) The ancient Romans started their day with breakfast. Of A Written! The lower class Romans or plebeians might have a breakfast of contest, dry bread or dipped in wine, and technology, water. Sometimes olives, cheese or raisins were sprinkled on the bread. Essay Rejection Letter! “It became a custom to distribute bread Ancient Egyptian Portraitures Essay. collection contains a large selection of components of a thesis, Egyptian, Classical, Ancient Near Eastern Art sculptures, or paintings in relief.

Many statues are generally idealized and incorporated into animal form, since the contest rejection intention of Ancient Egyptians was often to illustrate as much of a traditional king as possible. Realistic features had greater possibility in the non-royal portraits than in book essay by elie wiesel the one for royal purposes . The assumption that Ancient Egyptian royal portraits were accurate is based loosely on the Contributions of essay letter, Ancient Civilizations Essay. particularly important in medicine during modern times. Ancient Greece was an incredible civilization that made contributions that are crucial to modern day life.

Athens, a city-state in well written thesis ancient Greece, was the first to use direct democracy, a system in which male citizens took part in government every day. Many democratic ideas from Greece were used in later times such as Rome and even in the United States today. Also, the ornate columns that the ancient Greeks developed are still used in different types be seen in genre of burlesque, which involved elaborate, risque parodies of well-known operas, plays, and ballets. Modern comedies, which typically involve practical jokes, sexual humour, and drunkenness, are inspired by satyr plays as well. Essay Letter! Ancient Greece was one of the first democratic societies and has greatly influenced modern day governments. Although the Greek idea of democracy is different from what is practiced today, their ideas formed the basis for modern democratic governments.

Prior The Divinity of Ancient Greece Essay. monotheism, the belief that there is only one god, and polytheism, the belief that there is essays, more than one god. Nowadays, one third of the world population is monotheistic (“World Religious Statistics”). Nonetheless, it was not like that at all in ancient times because the majority of cultures were polytheistic.

Greece, a country located in southeast Europe, is essay, well known today due to the Greek gods and goddesses, the divine power in which the Greeks believed. The Greek gods and goddesses were a group

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Extending WCF’s Client and Dispatcher Runtimes. Published: October 2009. Introduction Extending the essay contest letter WCF Channel Model Extending the WCF Client-Dispatcher Runtimes Extending the WCF Security Model Extending the brave technology WCF Hosting Model Extending the WCF Metadata Model Extending the essay contest rejection WCF Web Programming Model Extending Dublin Application Server Building Custom Binding Elements and Behaviors. The Client and Dispatcher runtimes together represent a fundamental architectural element of WCF. These runtimes are responsible for orchestrating a set of essays, components that implement the message processing and operation invocation in the client and service side respectively. Specifically, functional areas such as message encoding, filtering, operation selection, and operation invocation are implemented within the client and service runtimes, diminishing the complexity from the developer. From a WCF programming model standpoint, the client and dispatcher runtimes expose various extensibility points that can be used to modify their default behavior. Developers can leverage these extensibility points to customize various WCF capabilities such as encoding messages, intercepting parameters or selecting the operation to invoke on rejection, the service side. It is important to recognize that client and essays on artists dispatcher runtimes don’t present identical feature sets. Essay Contest Rejection. For instance, some capabilities, like message filtering, are only relevant on the service (dispatcher) side. However, other components, such as message or parameter inspectors, can be executed on both runtimes.

The following figure provides a view of some of the fundamental components of the WCF client and dispatcher runtimes: Figure 1: Client-Dispatcher runtimes extensibility model. In a calling application, the client runtime is responsible for translating method invocations in application code into outbound messages, pushing them to the underlying channels, and translating results back into return values and out parameters. Essays Existentialism. This runtime model presents different service model extensions to modify or implement execution or communication behavior and features client or dispatcher functionality such as message and rejection parameter interception, operation selection, message encoding and new world essay other extensibility functionality. In the service application, the dispatcher runtime is responsible for pulling incoming messages out of the underlying channels, translating them into method invocations in application code, and sending the rejection results back to the caller. This runtime model presents different service model extensions to modify or implement execution or communication behavior and features client or dispatcher functionality such as message and parameter interception, message filtering, encoding and new world essay other extensibility functionality. In this chapter we explore the specifics of implementing the rejection letter different extensibility points of WCF’s client and book essay on night dispatcher runtimes. Following the contest letter style presented throughout this paper, we have included an overview of the essays on fingerprinting functionality of the different extensibility components as well as some of the essay contest rejection letter real world scenarios on tom thesis, which they can be applied. Finally, we provide a sample implementation of the different extensibility points that developers can use as the basics of essay contest, their own extensibility projects.

Message Encoders are the new world technology essay WCF components responsible for converting a Message object (SOAP, XML, JSON) into a wire representation (bytes). On the WCF stack, encoders sit right above the transport channel and essay rejection letter below the rest of the WCF pipeline components. By default, WCF includes different message encoders that interpret some the essays on fingerprinting most common Web Services encoding formats such as Text, MTOM or Binary. Additionally, developers can incorporate new encoding techniques by extending the System.ServiceModel.Channels.MessageEncoder class which abstracts the basic functionalities of a message encoder. Developers should consider implementing custom encoders in scenarios that require a specific message encoding mechanism that can’t be addressed by the default bindings. The following list includes some of those scenarios:

Message Compression: Some scenarios require the use of proprietary algorithms to compress the messages exchanged between client and services. Let us take the example of essay rejection, a bank that has developed a custom binary format for tom thesis encoding the transaction history of a client. In order to accept a message encoded in that format as part of their WCF services, developers can implement a custom message encoder that translates the proprietary binary format into a WCF message object. Optimized file type encoding: The transmission of some binary file types such as Adobe PDF can be highly optimized by using a native encoding format instead of WCF’s binary encoder. Essay Contest Letter. Those custom encoding formats can be incorporated as part of a custom message encoder that can be natively used by WCF services. The fundamental steps of building a new message encoder relies on implementing the ReadMessage and WriteMessage methods of the System.ServiceModel.Channels.MessageEncoder abstract class. When a message is essays, received by the transport channel, the runtime calls the ReadMessage operation to translate the received byte[] into a WCF Message object that can be processed by the other elements of the WCF pipeline.

Similarly, when a message is contest rejection, ready to be sent, the runtime calls a WriteMessage operation in order to serialize the Message object into book essay wiesel, the corresponding byte[] that can be used by the transport channel. The following code illustrates the implementation of a custom encoder (for the simplicity of this sample, we have omitted the details regarding the essay letter bytes[]-Message transformation): public class SampleMessageEncoder: MessageEncoder. private SampleMessageEncoderFactory factory; public SampleMessageEncoder(SampleMessageEncoderFactory factory) public override Message ReadMessage(Stream stream, int maxSizeOfHeaders, string contentType) //implementation omitted for brevity. Message message= Message.CreateMessage(. ); public override ArraySegmentbyte WriteMessage(Message message, int maxMessageSize, BufferManager bufferManager, //implementation omitted for brevity. ArraySegmentbyte byteArray = Encode message into a byte array… public override void WriteMessage(Message message, Stream stream) //implementation omitted for brevity. …Rest of the implementation omitted for brevity. Figure 2: Custom message encoder (the complete implementation can be found in the code samples attached to essays on fingerprinting this paper) In order to instantiate the custom encoder, we need to implement a custom System.ServiceModel.Channels.MessageEncoderFactory and contest rejection override the Encoder property: public class SampleMessageEncoderFactory: MessageEncoderFactory. private MessageEncoder encoder; internal SampleMessageEncoderFactory(string mediaType, string charSet, MessageVersion version) this.encoder = new SampleMessageEncoder(this); public override MessageEncoder Encoder. …Rest of the implementation omitted forbrevity. Figure 3: Custom message encoder factory Figure: Custom message encoder (the complete implementation can be found in the code samples attached to builder this paper)

Once we have implemented the contest rejection message encoder factory, we need to add it to the WCF runtime. We can accomplish this by implementing a binding element that inherits from the System.ServiceModel.Channels.MessageEncodingBindingElement class and overriding the CreateMessageEncoderFactory operation: public class SampleMessageEncoderBindingElement:MessageEncodingBindingElement. public override MessageEncoderFactory CreateMessageEncoderFactory() return new SampleMessageEncoderFactory(); public override BindingElement Clone() return new SampleMessageEncoderBindingElement(this); …The rest of the implementation has been omitted for brevity. Figure 4: Initializing a custom message encoder factory (the complete implementation can be found in the code samples attached to this paper) At this point we can programmatically add the binding element as illustrated in the following code: ICollectionBindingElement bindingElements = new ListBindingElement(); HttpTransportBindingElement httpBindingElement = new HttpTransportBindingElement(); SampleMessageEncoderBindingElement sampleEncodingBindingElement = new SampleMessageEncoderBindingElement();

CustomBinding binding = new CustomBinding(bindingElements); Figure 5: Adding a custom message encoder programmatically. Alternatively, we can implement a binding extension element in order to enable a declarative mechanism to add the message encoding binding element: public class SampleMessageEncoderBindingExtensionElement: public override Type BindingElementType. protected override BindingElement CreateBindingElement() return new SampleMessageEncoderBindingElement(); Figure 6: Custom message encoding binding extension element. The binding extension element can be added declaratively as illustrated in the following code: add name=customMessageEncoding type=Tellago.ServiceModel.Samples.MessagingExt.SampleMessageEncoderBindingExtensionElement, Tellago.ServiceModel.Samples.MessagingExt, Version=, Culture=neutral, PublicKeyToken=null / Figure 7: Registering a custom message encoder declaratively. WCF filters are components that inspect an on artists incoming message and contest letter evaluate a set of Boolean predicates in order to on artists make operational decisions about the message processing. Given the semantics of essay letter, its functionality, message filters only execute on the service side and have no equivalent on essays, the client side. WCF provides a set of rejection, default filters that address some of the most common filtering scenarios. For instance, the ActionMessageFilter evaluates a message based on a list of actions while the XPathMessageFilter uses a set of XPath predicates to filter the message base on new world essay, its contents. Filters are orchestrated by contest, the WCF filtering system which is optimized for performance.

More specifically, filters are grouped in filter tables that indicate what actions need to be executed in case the message matches a specific filter. New World. A filter table is another WCF extensibility component abstracted by essay contest rejection letter, the IMessageFilterTable interface. Custom filters are a great fit for scenarios that require executing custom logic that assert whether a message should be processed by the runtime. Message validation: Some services require levels of message validation that go beyond what can be expressed in book on night a contract. For instance, a WCF service that processes a financial transaction can use a filter that validates the transaction based on rejection letter, rules deployed in a business rules server.

This type of scenario is particularly important in essays RESTful services that don’t expose any static contract validation. We can address these types of scenarios by essay, implementing a custom message filter that implements the required message validation. In our example, the existentialism custom filter will interact with the business rules server in order to execute certain policies against the message. Routing: Combining filters and essay contest filter tables developers can implement intelligent routing logic that distributes messages to services based on the criteria implemented by specific filters. On Artists. For instance, we can use filter tables to letter route an tom thesis builder incoming message to different endpoints based on the output of specific message filters. An example of essay, this technique is the forwarding service included as part of of a well thesis, WCF 4.0. WCF message filters are abstracted by contest, the System.ServiceModel.Dispatcher.MessageFilter class. Specifically, the WCF runtime calls the Match method of this class in order to determine if a Message is compliant with the filter criteria.

The following code illustrates a sample implementation of components thesis, a filter: public class SampleMessageFilter: MessageFilter. public override bool Match(Message message) …Implementation has been omitted for brevity… public override bool Match(MessageBuffer buffer) …Implementation has been omitted for brevity… Figure 8: Sample WCF message filter. As you can see, both overrides of contest rejection letter, Match returns a single Boolean parameter indicating whether a message is valid according to the filter’s criteria. Depending of the functionality implemented by on artists, the filter, a message filter can be deployed using different mechanisms. Essay Contest Rejection. A very common technique is to initialize message filters as part of a WCF service or endpoint behavior. The following code shows a WCF Endpoint Behavior that replaces the default action filter by of a thesis, our sample filter: public class MsgExtensibilityEndpointBehavior: IEndpointBehavior.

public void AddBindingParameters(ServiceEndpoint endpoint, public void ApplyClientBehavior(ServiceEndpoint endpoint, public void ApplyDispatchBehavior(ServiceEndpoint endpoint, Console.WriteLine(Adding custom message filter. ); endpointDispatcher.AddressFilter = new SampleMessageFilter(); public void Validate(ServiceEndpoint endpoint) Figure 9: Adding a WCF filter in an endpoint behavior. We can use similar mechanisms for contest initializing other types of message filters. Following the on fingerprinting same techniques demonstrated in this paper, we can deploy our sample behavior either programmatically or declaratively by rejection, implementing a custom behavior extension element. Message inspectors are a WCF extensibility element that can be used in the service model's client runtime and dispatch runtime programmatically or through configuration. Message inspectors can inspect and alter messages after they are received or before they are sent.

From a programming model standpoint, they are abstracted by the System.ServiceModel.Dispatcher.IClientMessageInspector and System.ServiceModel.Dispatcher.IDispatchMessageInspector interfaces respectively. By implementing these symmetric interfaces we can develop message inspectors that work seamlessly across the tom thesis builder client and contest dispatcher runtimes. Given its generic functionality and the versatility of its programming model, WCF message inspectors can be applied ubiquitously across a large variety of scenarios like the essay ones listed below: Tracking: Developers can implement WCF message inspectors for essay contest rejection instrumenting services and clients by implementing custom tracking mechanisms. For instance, the WCF Business Activity Monitoring (BAM) interceptor included as part of BizTalk Server R2 is essays on artists, implemented as a WCF message inspector. Essay Contest Rejection. Transformation: WCF message interceptors are an ideal place to apply custom transformations to the incoming and outgoing message by executing XSLT or XQuery scripts. As explained in the previous section, the fundamental steps for building client or service message interceptors are implementing the System.ServiceModel.Dispatcher.IClientMessageInspector and System.ServiceModel.Dispatcher.IDispatchMessageInspector respectively. A client inspector intercepts the request message before it is sent to the service and the response message before it gets processed by the client application. On Artists. In that case, the programming logic is contest, expressed as part of the book on night by elie wiesel BeforeSendRequest and essay contest rejection letter AfterReceiveReply methods of the System.ServiceModel.Dispatcher.IClientMessageInspector interface. Similarly, a dispatch inspector enables the interception of inbound or outbound messages either prior to tom thesis builder dispatching a request message to an operation or before returning a reply message to a caller.

Programmatically, developers should implement the AfterReceiveRequest and essay contest BeforeSendReply methods of the book on night by elie wiesel System.ServiceModel.Dispatcher.IDispatchMessageInspector interface. The following code shows an implementation of a custom dispatch and client message inspector: public class SampleDispatchMessageInspector: IDispatchMessageInspector, public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext) …Implementation has been omitted for brevity… public void BeforeSendReply(ref Message reply, object correlationState) …Implementation has been omitted for brevity… public object BeforeSendRequest(ref Message request, …Implementation has been omitted for brevity… public void AfterReceiveReply(ref Message reply, …Implementation has been omitted for brevity… Figure 10: Custom message inspector. The WCF runtime will call the Before… and essay rejection After… methods to intercept the well thesis messages that are processed by the client and service applications. Similar to other WCF extensibility components, we can inject this message interceptor into contest letter, the WCF dispatcher runtime by on fingerprinting, implementing the corresponding behavior as illustrated in letter the following code: public class MsgExtensibilityEndpointBehavior: IEndpointBehavior. public void AddBindingParameters(ServiceEndpoint endpoint, public void ApplyClientBehavior(ServiceEndpoint endpoint, public void ApplyDispatchBehavior(ServiceEndpoint endpoint, public void Validate(ServiceEndpoint endpoint) Figure 11: Instantiating a message inspector using an components well thesis endpoint behavior. Following the essay rejection letter same techniques demonstrated in this paper, we can deploy our sample behavior either programmatically or declaratively by implementing a custom behavior extension element.

As a message gets processed by WCF’s client and dispatcher runtimes it has to eventually be translated into objects that can be manipulated by the service or client application. These processes are commonly known as serialization and deserialization and are handled by a component of WCF’s runtime known as message formatters. Typically, message formatters rely on an existing serializer such as DataContractSerializer or the XmlSerializer to transform an incoming or outgoing message into brave new world, objects that can be interpreted by essay contest rejection, WCF’s applications. However there are scenarios on tom thesis, which we need specialized conversions between messages and objects that can’t be accomplished by the default serializers. Contest Letter. We can address those scenarios by extending WCF’s serialization runtime implementing a custom message formatter.

From a programming model standpoint, message formatters are abstracted by the System.ServiceModel.Dispatcher.IDispatchMessageFormatter and existentialism System.ServiceModel.Dispatcher.IClientMessageFormatter depending on whether the formatting logic executes on the service or client side respectively. Developers can consider using these interfaces for implementing additional mechanisms for converting a WCF message into objects that cannot be achieved with the default serializers. Implementing custom message formatters allows developers to extend the WCF infrastructure to accept different message schemes. In that sense, custom message formatters are applicable in a variety of rejection letter, scenarios as illustrated in the following list: Custom message formats: By implementing a custom message formatter developers can abstract the translation from objects to specific message formats different from the traditional XML or SOAP. For instance a custom message formatter can serialize-deserialize objects into a .pdf document that can be encoded in essays stranger a WCF message object. Extending default serializers: Even when using the default serializers (Xml, Data Contract), there are scenarios that require an extra level of essay contest letter, customization in essays on artists terms of the message-to-object transformation. For instance, some scenarios might require some alteration of the value of a certain object’s properties based on the contents of the corresponding message.

Scenarios like those can be easily addressed by contest, the use of a custom message formatter that extends one of the default formatters. As explained in the previous sections, WCF abstracts a message formatter by using the essays System.ServiceModel.Dispatcher.IDispatchMessageFormatter and System.ServiceModel.Dispatcher.IClientMessageFormatter interfaces depending on essay contest letter, whether the formatting logic should be executed on essays existentialism stranger, the service or client side respectively. Both interfaces include methods for converting a WCF Message into objects and vice versa. The following code illustrates a sample implementation of a dispatch message formatter: public class SampleDispatchMessageFormatter: IDispatchMessageFormatter. public void DeserializeRequest(Message message, object[] parameters) XmlDictionaryReader reader = message.GetReaderAtBodyContents();

XDocument xBodyDoc= XDocument.Parse(reader.ReadOuterXml()); public Message SerializeReply(MessageVersion messageVersion, object[] parameters, object result) Console.WriteLine(Message Formatter: Executing SerializeReply. XmlNodeReader bodyReader = WriteResponseMessage((string)result); Message response= Message.CreateMessage(messageVersion, Figure 12: Sample dispatch message formatter implementation (the complete implementation can be found in the code samples attached to this paper) At runtime, WCF invokes the DeserializeRequest method to transform an contest rejection letter incoming message into existentialism stranger, a set of objects that should be passed to contest rejection letter the service’s operation. Similarly, the SerializeReply method isused by the WCF runtime to on night by elie construct the message that should be sent back the client based on the output of an essay contest rejection letter operation.

WCF provides an brave new world equivalent programming model for the client message formatter. We can inject our custom message formatter into the WCF runtime by assigning it to the Formatter property of the essay letter DispatchOperation object. Essays On Fingerprinting. We can accomplish this by implementing the corresponding type of behavior. The following sample shows how to accomplish this by implementing a WCF endpoint behavior: public class MsgExtensibilityEndpointBehavior: IEndpointBehavior. public void AddBindingParameters(ServiceEndpoint endpoint, public void ApplyClientBehavior(ServiceEndpoint endpoint, public void ApplyDispatchBehavior(ServiceEndpoint endpoint, SampleDispatchMessageFormatter formatter = new. foreach (DispatchOperation operation in. public void Validate(ServiceEndpoint endpoint)

Figure 13: Adding a message formatter using a WCF endpoint behavior. Through the technique illustrated above, we are instructing WCF to use our custom message formatter when a message is contest letter, sent or received by the WCF service. Following the tom thesis same techniques demonstrated in rejection this paper, we can deploy our sample behavior either programmatically or declaratively by builder, implementing a custom behavior extension element. Until this point, we have explored a series of rejection, WCF extensibility points that fundamentally manipulate the message representations on the client or dispatcher runtimes. After the WCF runtimes translate a message into objects by using a message formatter, there are other WCF components that interact with the objects that are ultimately processed by the client or service application.

These components represent another set of tom thesis builder, WCF extensibility points which are closer to the service and client definition as they manipulate CLR specific components such as objects, parameters or operations. Rejection Letter. By leveraging these extensibility points, developers can customize key functionalities such as parameter inspection or operation selection and invocation all of which are the subject of our next section. WCF parameter inspectors are extensibility components that allow inspecting the parameters of a service or client call. These types of components can be seen as providing complementary functionality to the message inspectors explored in components of a well thesis previous sections. Essay Contest Rejection Letter. Similar to message inspectors, parameter inspectors implement message filtering and inspection on operation parameters and result types.

WCF abstracts the concept of a parameter inspector by using the System.ServiceModel.Dispatcher.IParameterInspector interface. On Fingerprinting. This interface is used for essay letter parameter inspectors executed in the client and essay on night by elie dispatcher runtimes. Parameter inspectors are one of the most general WCF components which can be applied ubiquitously across a large variety of scenarios. By implementing these components, developers can add additional levels of contest rejection, parameter validations and filtering in a completely orthogonal manner to components of a well written thesis the service or client functionality. The following list illustrates some of the most common functionalities that can be implemented with parameters inspectors: Parameter Validation: Parameter inspectors can be used as a vehicle for injecting complex validation logic against the operation parameters and result types that complement the service and client code.

For instance, a parameter inspector can validate the parameters of an operation by using Windows Workflow Foundation rules. The fundamental task of implementing a WCF parameter inspector is implementing the System.ServiceModel.Dispatcher.IParameterInspector interface. From the WCF’s programming model standpoint, the experience of essay letter, implementing a parameter inspector is identical whether the inspector is components well written, hosted in the client or service side. Essay Rejection. The following code illustrates sample implementation of a parameter inspector. public class SampleDispatchParameterInspector: IParameterInspector. public void AfterCall(string operationName, object[] outputs, object returnValue, object correlationState) …Implementation has been omitted by brevity…. public object BeforeCall(string operationName, object[] inputs)

Console.WriteLine(Custom parameter inspector: Executing operation BeforeCall); …Implementation has been omitted by brevity…. Figure 14: Custom parameter inspector. The BeforeCall and AfterCall methods are invoked by the WCF runtime to intercept the parameters before and after a client or service operation is invoked. In order to inject the parameter inspector into the WCF client or dispatcher runtimes we need to add it to the ParameterInspectors property of the book on night by elie DispatchOperation object. This can be achieved in the context of the essay letter WCF behavior as illustrated in builder the following code: public class CustomExtensibilityEndpointBehavior: IEndpointBehavior. public void AddBindingParameters(ServiceEndpoint endpoint, public void ApplyClientBehavior(ServiceEndpoint endpoint, public void ApplyDispatchBehavior(ServiceEndpoint endpoint, foreach (DispatchOperation operation in. public void Validate(ServiceEndpoint endpoint)

Figure 15: Initializing custom parameter inspector. Following the same techniques demonstrated in this paper, we can deploy our sample behavior either programmatically or declaratively by implementing a custom behavior extension element. One of the fundamental tasks of any Web Service runtime in object oriented technologies is to essay contest determine what operation to invoke on the service side based on the contents of a message. WCF implements this functionality by using operation selectors which are other extensibility points of the dispatcher runtime. Essentially, operation selectors are responsible for book on night by elie wiesel inspecting the message and indicating to the WCF runtime what operation to invoke in the service’s class. From a programming model standpoint, operation selectors are abstracted by essay contest letter, the System.ServiceModel.Dispatcher.IDispatchOperationSelector interface. As you already know, WCF includes a set of components well thesis, default operation selectors that implement the most common operation selection models in the SOAP and REST styles. However, some scenarios require an extra level of customization on essay, this functionality. You can consider implementing a custom operation selector in scenarios that require a specific logic for components of a well thesis determining the operation to invoke on the service instance that is not covered by the default selectors. Essay Contest Rejection. The following list includes some of the most common cases for considering implementing a custom operation selector:

Content based selection: Certain scenarios might require inspecting the contents of the message in essays order to determine the service operation that needs to essay contest be invoked. Builder. Custom Action Mapping: In some scenarios the essay letter dispatcher runtime might need a more sophisticated algorithm to map a SOAP or WS-Addressing action to a service operation. For instance, a custom implementation can use a simple and highly customizable rules engine to map the WS-Addressing headers to a specific operation. The fundamental step of building a custom operation selector consists of implementing the System.ServiceModel.Dispatcher.IDispatchOperationSelector interface and builder specifically the SelectOperation method. This operation outputs the name of the method that should be invoked in essay contest rejection the service instance based on essays, the details of the incoming message. The following figure illustrates a sample implementation of an operation selector: public class SampleOperationSelector: IDispatchOperationSelector. public string SelectOperation(ref Message message) …Implementation has been omitted for brevity… return Operation’s Name; Figure 16: Operation selector sample implementation. We can initialize our custom operation select by setting the OperationSelector property of the dispatcher runtime. Similarly to contest letter other extensibility components, we can access the dispatcher runtime by implementing a custom behavior: public class MsgExtensibilityEndpointBehavior: IEndpointBehavior. public void AddBindingParameters(ServiceEndpoint endpoint, public void ApplyClientBehavior(ServiceEndpoint endpoint, public void ApplyDispatchBehavior(ServiceEndpoint endpoint, foreach (DispatchOperation operation in.

public void Validate(ServiceEndpoint endpoint) Figure 17: Adding an operation selector using an endpoint behavior. Following the same techniques demonstrated in this paper, we can deploy our sample behavior either programmatically or declaratively by implementing a custom behavior extension element. After executing a set of the book essay on night by elie wiesel components explored in previous sections, the rejection dispatcher runtime needs to invoke the service operation by passing it the corresponding parameters. This capability is abstracted by WCF using operation invokers which are another important component of the WCF extensibility programming model.

Fundamentally, WCF models operation invokers by using the brave new world System.ServiceModel.Dispatcher.IOperationInvoker interface. By implementing that interface, developers can gain control over how the service operation is invoked and essay contest rejection letter the results (if any) are initially processed. Custom operation invokers allow developers to control the process of invoking an operation in a WCF service instance. This capability enables a variety of scenarios like the ones included in the following list: Dependency Injection: A custom operation selector can dynamically inject custom logic that extends the implementation of a service operation. For instance, a custom operation invoker can execute an operation of a specific interface extracted from a dependency injection container such as Microsoft's Unity right before the service operation is invoked. Pre and essays Post operation logic: We can implement a custom operation selector to execute logic that executes right before and after a service operation is invoked. Essay Letter. This feature could be really useful to enable capabilities such as tracking operation execution metrics or incorporating compensation logic. The fundamental step of essay by elie, implementing a WCF operation invoker is to implement the System.ServiceModel.Dispatcher.IOperationInvoker interface which abstracts the mechanisms for invoking an operation synchronously and asynchronously. The following code illustrates a sample implementation of this interface: public class SampleOperationInvoker: IOperationInvoker.

private IOperationInvoker innerOperationInvoker; public SampleOperationInvoker(IOperationInvoker innerinvoker) public bool IsSynchronous. public object Invoke(object instance, object[] inputs, out object[] outputs) …Implementation has been omitted for rejection letter brevity… return innerOperationInvoker.Invoke(instance, inputs, public object[] AllocateInputs() public IAsyncResult InvokeBegin(object instance, object[] inputs, AsyncCallback callback, object state) …Implementation has been omitted for brevity… return innerOperationInvoker.InvokeBegin(instance, inputs, public object InvokeEnd(object instance, out object[] outputs, …Implementation has been omitted for brevity… return innerOperationInvoker.InvokeEnd(instance, out outputs, Figure 18: Custom operation invoker. As illustrated in the previous code, our custom operation invoker implements the methods for calling a service’s method synchronously and asynchronously. We can initialize our operation invoker by essays, setting the Invoker property of the essay rejection letter operation runtime object. Essays Stranger. One of the easiest ways to accomplish that is by implementing a custom operation behavior as illustrated in the following code: public class CustomExtensibilityOperationBehavior: Attribute, public void AddBindingParameters(OperationDescription. operationDescription, BindingParameterCollection bindingParameters) public void ApplyClientBehavior(OperationDescription.

operationDescription, ClientOperation clientOperation) public void ApplyDispatchBehavior(OperationDescription. operationDescription, DispatchOperation dispatchOperation) …Implementation has been omitted for brevity… public void Validate(OperationDescription operationDescription) Figure 19: Instantiating a custom operation invoker. We can use the previous behavior by simply applying it as an attribute to the service operation we are trying to essay contest rejection letter customize the invocation from. Creating a custom WCF error handler. Error handling is one of the most important aspects of distributed systems and particularly those that follow the of a written thesis principles of service orientation. Most of the contest Web Services technology stacks enable sophisticated mechanisms for mapping native exceptions to representation formats such as SOAP faults or HTTP error codes that can be transmitted over the wire.

Quite often, developers need to extend or customize these mechanisms in order to support some of the Web Services error handling capabilities required by service oriented scenarios. WCF provides a versatile programming model that transforms managed exceptions into SOAP faults and vice-versa. Using this model, developers can handle declared (part of the service contract) and new world technology essay undeclared operations as part of WCF solutions. Additionally, WCF’s exception handling model presents a series of essay, extensibility points that allow developers to incorporate custom error handling mechanisms directly at the infrastructure level. The fundamental element of essays on artists, this extensibility model is the System.ServiceModel.Dispatcher.IErrorHandler which allows developers to essay contest manipulate application-level exceptions and send the corresponding fault messages to the client side. Using this interface, we can implement error handling mechanisms that can be used ubiquitously across multiple services. For instance, let’s assume we are building a set of Web Services that implement a B2B standard. Tom Thesis Builder. As part of the implementation we can incorporate different error handlers that transform the rejection service’s exceptions into a format compliant to the B2B standard. Custom error handlers are a very common extensibility point used in WCF solutions. Fundamentally, developers should consider implementing custom error handlers to extend the fundamental WCF programming model by implementing infrastructure-level exception handling mechanisms. The following list includes some of the scenarios that can be enhanced by the use of custom error handlers:

Standard error messages: Error standardizationis a common practice in service-oriented enterprise applications. For instance, a financial institution could standardize the specific SOAP faults formats that should be followed by the different WCF services in the enterprise. This scenario can be addressed by implementing a custom WCF error handler that transforms the generated exceptions in brave new world technology essay a message compliant by the enterprise standards. Monitoring: WCF error handlers are often used to track and monitor the contest rejection letter exceptions generated by WCF services. For instance, we can implement a custom WCF error handler that logs service’s exceptions to book essay on night wiesel a custom database in order to enable capabilities such as error reporting and essay rejection analysis. WCF abstracts error handlers by using the components of a well System.ServiceModel.Dispatcher.IErrorHandler interface. Developers can implement this interface in contest order to essays implement custom error handling mechanisms. Specifically, the WCF runtime will call the ProvideFault method of a custom event handler in order to build the fault message that should be sent to the client applications.

Additionally, custom event handlers should implement the HandleError operation to essay contest rejection ensure error-related behaviors, including error logging, shutting down the application, etc. On Fingerprinting. The following code illustrates the implementation of a custom error handler: public class SampleErrorHandler : IErrorHandler. public bool HandleError(Exception error) . Implementation has been omitted for brevity. public void ProvideFault( ref Message msg. = new FaultExceptionGreetingFault(new SampleFault(error.Message));

MessageFault fault = fe.CreateMessageFault(); Figure 20: Custom error handler. When an error occurs, the WCF runtime will invoke the error handlers included in contest letter the error handler’s collection of the of a System.ServiceModel.Dispatcher.ChannelDispatcher object. We can add our custom error handler to that collection by implementing a custom behavior as illustrated in the following code: public class SampleErrorBehavior : IServiceBehavior. void IServiceBehavior.Validate(ServiceDescription description, ServiceHostBase serviceHostBase) description, ServiceHostBase serviceHostBase) SampleErrorHandler errorHandler = new SampleErrorHandler(); foreach (ChannelDispatcherBase channelDispatcherBase in. ChannelDispatcher channelDispatcher = channelDispatcherBase as. . The rest of the essay contest implementation has been omitted for brevity. Figure 21: Initializing a custom event handler using a service behavior. As illustrated in existentialism the previous code, the contest rejection custom service behavior creates an instance of our custom error handler and adds it to the channel dispatcher so that it can be used by the WCF runtime.

Similar techniques can be implemented with endpoint behaviors. One of the existentialism stranger great capabilities of WCF is the flexible model that controls how services are instantiated in response to messages processed by the dispatcher runtime. In its current version, WCF includes the default instancing models listed below: PerCall: A new service object is created for each client request. PerSession: A new service object is created for each new client session and maintained for the lifetime of that session (this requires a binding that supports sessions). Single: A single service object handles all client requests for the lifetime of the contest letter application. Internally, WCF delegates the creation of a service instance onto a component known as instance providers. Tom Thesis. These components are abstracted by the System.ServiceModel.Dispatcher.IInstanceProvider interface and are responsible for controlling the service’s instances in the WCF’s dispatcher runtime. Developers can build custom instance providers in order to implement additional instancing patterns that can be used by WCF services. Custom instance providers are frequently used in scenarios in which the contest number of service instances that can be created is determined by builder, certain constraints. The following are some of the most common scenarios for essay contest rejection letter implementing a custom instance provider.

Instance pooling: In this scenario, the on fingerprinting dispatcher runtime can only run a specific number of concurrent service instances. In order to rejection address this scenario and builder minimize the service creation overhead we can implement a custom instance provider that keeps a pool of rejection, service instances which are passed to the WCF runtime using a specific distribution algorithm. Well. In that sense, service instances are placed in a pool as created. Essay Contest. Once the maximum number of concurrent instances is builder, reached, the runtime will dispatch subsequent requests to one of the instances in the pool. Letter. Custom initialization: By implementing a custom instance provider developers can initialize a service with a custom state based on well, the incoming message. WCF instance providers are abstracted by the System.ServiceModel.Dispatcher.IInstanceProvider interface which includes the required methods for creating new service instances. Specifically, the overloaded versions of the essay GetInstance method are responsible for providing the dispatcher runtime with the technology service instance that should be used to process the incoming request. In a similar manner, the essay rejection letter ReleaseInstance method is invoked by the runtime in tom thesis order to release the essay rejection resources associated with a specific service instance. The following code illustrates a sample instance provider: public class SamplePoolInstanceProvider: IInstanceProvider. public SamplePoolInstanceProvider(Type servicetype) public object GetInstance(InstanceContext instanceContext) …Implementation has been omitted for brevity… return service instance; public object GetInstance(InstanceContext instanceContext, …Implementation has been omitted for essays existentialism stranger brevity… return service instance; public void ReleaseInstance(InstanceContext instanceContext, …Implementation has been omitted for brevity… Figure 22: Custom instance provider.

This instance provider can be enabled by implementing a custom behavior as illustrated in contest letter the following code: public class SampleInstanceProviderBehavior: IServiceBehavior. private Type serviceType; public void AddBindingParameters( public void ApplyDispatchBehavior( foreach(ChannelDispatcher channelDispatcher in. foreach (EndpointDispatcher endpointDispatcher in. public void Validate(ServiceDescription serviceDescription, Figure 23: Instantiating a custom instance provider. Following the essays same techniques demonstrated in this paper, we can deploy our sample behavior either programmatically or declaratively by implementing a custom behavior extension element. This chapter has explained about letter a dozen of the essays on fingerprinting fundamental extensibility points of essay rejection letter, WCF’s client and dispatcher runtimes. Developers can use the essays existentialism stranger code samples and techniques illustrated in this chapter to extend essential capabilities of contest letter, WCF’s client and essays on artists dispatcher runtimes such as message encoding, filter, inspection, operation selection, instancing, among many others. Additionally, we’ve provided examples of essay contest rejection, real world scenarios that can directly benefit from the extensibility model of WCF’s client and dispatcher runtimes. Jesus Rodriguez: Jesus Rodriguez is the Chief Architect of Tellago, Inc.

He is also a Microsoft BizTalk Server MVP, an Oracle ACE and one of a few Architects worldwide to be a member of the Microsoft Connected Systems Advisor team. As a member, Jesus has been selected to participate in a variety of Software Design Reviews with Microsoft's Product Teams including Windows Communication Foundation, Windows Workflow Foundation and tom thesis builder BizTalk Server. Jesus derived his extensive experience with business process integration and contest messaging through numerous implementations of disparate systems founded on tom thesis, the principles of SOA and essay rejection BPM. Jesus is an active contributor to the .NET and J2EE communities and book essay an internationally recognized speaker and author with contributions that include several articles for various publications including MSDN Magazine, Microsoft Architecture Journal, SOAWorld and Web Services Journal as well as speaking engagements at top industry conferences such as Microsoft TechEd, SOAWorld, Microsoft SOA and BPM Conference, Oracle Open World, software Architect Conference, Web Services Security Conference and the Microsoft MVP Summit. Additionally, Jesus has conducted a number of essay contest rejection, Web Casts on varying SOA technologies. Jesus is a prolific blogger on builder, all subjects related to integration and has a true passion for technology. You can gain valuable insight on rejection letter, leading edge technologies through his blog at Pablo Cibraro: Pablo is essays stranger, a senior architect in Tellago Inc, and an internationally reconigzed expert with over 10 years of experience in architecting and implementing large distributed systems with Microsoft Technnologies. He has spent the contest letter past few years working directly with the Microsoft Patterns Practices team on essays on artists, sample applications, patterns and guidance for building service-oriented applications with Web Services, Web Services Enhacements (WSE) and Windows Communication Foundation (WCF).

The biggest contributions with this team were the contest Web Services Security patterns, and the implementation of a Secure Token Service quickstart for essays on fingerprinting WSE 3.0 and WCF. He now focuses on technologies that enable developers to build large scale systems such as WCF, WF, Dublin, OSLO and Windows Azure. The community knows Pablo mainly for his weblog and contest active participation in conferences and forums.