Enterprise Integration Pattern= s

Camel supports most of the Enterprise Integration Patterns from th= e excellent book by Gregor Hohpe a= nd 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.

The EIP icons library is available as a Visio stencil file adapted to re= nder the icons with the Camel color : sand. See resources section to download them for your presentation, functio= nal and technical documents.

Messagin= g Systems

	Message Channel	How does one application communicate with anoth= er 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 mess= age while maintaining independence and flexibility?
	Message Router	How can you decouple individual processing step= s so that messages can be passed to different filters depending on a set of= conditions?
	Message Translator	How can systems using different data formats co= mmunicate with each other using messaging?
=	Message Endpoint	How does an application connect to a messaging = channel to send and receive messages?

Messagi= ng Channels

	Point to Point Channel <= /td>	How can the caller be sure that exactly one rec= eiver will receive the document or perform the call?
=	Publish Subscribe Chan= nel	How can the sender broadcast an event to all in= terested receivers?
	Dead Letter Channel	What will the messaging system do with a messag= e it cannot deliver?
	Guaranteed Delivery	How can the sender make sure that a message wil= l be delivered, even if the messaging system fails?
	Message Bus	What is an architecture that enables separate a= pplications to work together, but in a de-coupled fashion such that applica= tions can be easily added or removed without affecting the others?

Messa= ge Construction

	Event Message	How can messaging be used to transmit events fr= om one application to another?
	Request Reply	When an application sends a message, how can it= get a response from the receiver?
	Correlation Identifier <= /td>	How does a requestor that has received a reply = know which request this is the reply for?

Message Ro= uting

	Content Based Router	How do we handle a situation where the implemen= tation of a single logical function (e.g., inventory check) is spread acros= s multiple physical systems?
	Message Filter	How can a component avoid receiving uninteresti= ng 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 mul= tiple elements, each of which may have to be processed in a different way? =
	Aggregator	How do we combine the results of individual, bu= t related messages so that they can be processed as a whole?
	Resequencer	How can we get a stream of related but out-of-s= equence messages back into the correct order?
	Composed Message Pro= cessor	How can you maintain the overall message flow w= hen processing a message consisting of multiple elements, each of which may= require different processing?
<= /td>	Scatter-Gather	How do you maintain the overall message flow wh= en a message needs to be sent to multiple recipients, each of which may sen= d 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 de= sign-time and may vary for each message?
<= /td>	Throttler	How can I throttle messages to ensure that a sp= ecific endpoint does not get overloaded, or we don't exceed an agreed SLA w= ith some external service?
<= /td>	Delayer	How can I delay the sending of a message?
<= /td>	Load Balancer	How can I balance load across a number of endpo= ints?
<= /td>	Multicast	How can I route a message to a number of endpoi= nts at the same time?
<= /td>	Loop	How can I repeat processing a message in a loop= ?

Mes= sage Transformation

	Content Enricher	How do we communicate with another system if th= e message originator does not have all the required data items available? <= /td>
	Content Filter	How do you simplify dealing with a large messag= e, when you are interested only in a few data items?
<= /td>	Claim Check	How can we reduce the data volume of message se= nt across the system without sacrificing information content?
	Normalizer	How do you process messages that are semantical= ly equivalent, but arrive in a different format?
<= /td>	Sort	How can I sort the body of a message?

Messag= ing Endpoints

<= /td>	Messaging Mapper	How do you move data between domain objects and= the messaging infrastructure while keeping the two independent of each oth= er?
	Event Driven Consumer	How can an application automatically consume me= ssages as they become available?
=	Polling Consumer	How can an application consume a message when t= he application is ready?
	Competing Consumers	How can a messaging client process multiple mes= sages concurrently?
	Message Dispatcher	How can multiple consumers on a single channel = coordinate their message processing?
=	Selective Consumer	How can a message consumer select which message= s it wishes to receive?
	Durable Subscriber	How can a subscriber avoid missing messages whi= le it's not listening for them?
<= /td>	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 i= nvoked both via various messaging technologies and via non-messaging techni= ques?

System M= anagement

	Detour	How can you route a message through intermediat= e steps to perform validation, testing or debugging functions?
	Wire Tap	How do you inspect messages that travel on a po= int-to-point channel?

Resources

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