Table of Contents
Camel supports most of the Enterprise Integration Patterns from the excellent book of the same name by Gregor Hohpe and Bobby Woolf. Its a highly recommended book, particularly for users of Camel.
There now follows a list of the Enterprise Integration Patterns from the book along with examples of the various patterns using Apache Camel
![]() | 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? |
![]() | 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? |
![]() | Correlation Identifier | How does a requestor that has received a reply know which request this is the reply for? |
![]() | 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? |
![]() | Recipient List | How do we route a message to a list of 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? |
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? |
![]() | 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 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? |
![]() | Wire Tap | How do you inspect messages that travel on a point-to-point channel? |
For a full breakdown of each pattern see the Book Pattern Appendix
There now follows a list of the Enterprise Integration Patterns from the book along with examples of the various patterns using Apache Camel
For a full breakdown of each pattern see the Book Pattern Appendix