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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.

The EIP icons library is available as a Visio stencil file adapted to render the icons with the Camel color : sand. Download it here for your presentation, functional and technical analysis documents. The original EIP stencil is also available in OpenOffice 3.x Draw (thanks to Marco Garbelini) , Microsoft Visio, or Omnigraffle.

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?

Return Address

How does a replier know where to send the reply?

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?

Composed Message Processor

How can you maintain the overall message flow when processing a message consisting of multiple elements, each of which may require different processing?

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?

Sampling

How can I sample one message out of many in a given period to avoid downstream route does not get overloaded?

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?

Claim Check

How can we reduce the data volume of message sent across the system without sacrificing information content?

Normalizer

How do you process messages that are semantically equivalent, but arrive in a different format?

Sort

How can I sort the body of a message?

Validate

How can I validate a message?

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

ControlBus

How can we effectively administer a messaging system that is distributed across multiple platforms and a wide geographic area?

Detour

How can you route a message through intermediate steps to perform validation, testing or debugging functions?

Wire Tap

How do you inspect messages that travel on a point-to-point channel?

Message History

How can we effectively analyze and debug the flow of messages in a loosely coupled system?

Log

How can I log processing a message?

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