[CONF] Apache Camel: Enterprise Integration Patterns (page edited)

[confluence]

Page Edited : CAMEL : Enterprise Integration Patterns Enterprise Integration Patterns has been edited by Jonathan Anstey (Feb 02, 2009). (View changes) Content: Enterprise Integration Patterns Camel supports most of the Enterprise Integration Patterns from the excellent book by Gregor Hohpe and Bobby Woolf. If you are new to Camel you might want to try the Getting Started in the User Guide before attempting to implement these patterns. Messaging Systems Message Channel How does one application communicate with another using messaging? Message How can two applications connected by a message channel exchange a piece of information? Pipes and Filters How can we perform complex processing on a message while maintaining independence and flexibility? Message Router How can you decouple individual processing steps so that messages can be passed to different filters depending on a set of conditions? Message Translator How can systems using different data formats communicate with each other using messaging? Message Endpoint How does an application connect to a messaging channel to send and receive messages? Messaging Channels Point to Point Channel How can the caller be sure that exactly one receiver will receive the document or perform the call? Publish Subscribe Channel How can the sender broadcast an event to all interested receivers? Dead Letter Channel What will the messaging system do with a message it cannot deliver? Guaranteed Delivery How can the sender make sure that a message will be delivered, even if the messaging system fails? Message Bus What is an architecture that enables separate applications to work together, but in a de-coupled fashion such that applications can be easily added or removed without affecting the others? Message Construction Event Message How can messaging be used to transmit events from one application to another? Request Reply When an application sends a message, how can it get a response from the receiver? Correlation Identifier How does a requestor that has received a reply know which request this is the reply for? Message Routing Content Based Router How do we handle a situation where the implementation of a single logical function (e.g., inventory check) is spread across multiple physical systems? Message Filter How can a component avoid receiving uninteresting messages? Dynamic Router How can you avoid the dependency of the router on all possible destinations while maintaining its efficiency? Recipient List How do we route a message to a list of (static or dynamically) specified recipients? Splitter How can we process a message if it contains multiple elements, each of which may have to be processed in a different way? Aggregator How do we combine the results of individual, but related messages so that they can be processed as a whole? Resequencer How can we get a stream of related but out-of-sequence messages back into the correct order? Scatter-Gather How do you maintain the overall message flow when a message needs to be sent to multiple recipients, each of which may send a reply? Routing Slip How do we route a message consecutively through a series of processing steps when the sequence of steps is not known at design-time and may vary for each message? Throttler How can I throttle messages to ensure that a specific endpoint does not get overloaded, or we don't exceed an agreed SLA with some external service? Delayer How can I delay the sending of a message? Load Balancer How can I balance load across a number of endpoints? Multicast How can I route a message to a number of endpoints at the same time? Loop How can I repeat processing a message in a loop? Message Transformation Content Enricher How do we communicate with another system if the message originator does not have all the required data items available? Content Filter How do you simplify dealing with a large message, when you are interested only in a few data items? Normalizer How do you process messages that are semantically equivalent, but arrive in a different format? Messaging Endpoints Messaging Mapper How do you move data between domain objects and the messaging infrastructure while keeping the two independent of each other? Event Driven Consumer How can an application automatically consume messages as they become available? Polling Consumer How can an application consume a message when the application is ready? Competing Consumers How can a messaging client process multiple messages concurrently? Message Dispatcher How can multiple consumers on a single channel coordinate their message processing? Selective Consumer How can a message consumer select which messages it wishes to receive? Durable Subscriber How can a subscriber avoid missing messages while it's not listening for them? Idempotent Consumer How can a message receiver deal with duplicate messages? Transactional Client How can a client control its transactions with the messaging system? Messaging Gateway How do you encapsulate access to the messaging system from the rest of the application? Service Activator How can an application design a service to be invoked both via various messaging technologies and via non-messaging techniques? System Management Wire Tap How do you inspect messages that travel on a point-to-point channel?

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