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Camel supports most of the Enterprise Integration Patterns from the excellent book by Gregor Hohpe and Bobby Woolf.
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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.
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| Message Channel | How does one application communicate with another using messaging? |
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| Message | How can two applications connected by a message channel exchange a piece of information? |
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| Pipes and Filters | How can we perform complex processing on a message while maintaining independence and flexibility? |
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| Message Router | How can you decouple individual processing steps so that messages can be passed to different filters depending on a set of conditions? |
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| Message Translator | How can systems using different data formats communicate with each other using messaging? |
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| Message Endpoint | How does an application connect to a messaging channel to send and receive messages? |
Messaging Channels |
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| Point to Point Channel | How can the caller be sure that exactly one receiver will receive the document or perform the call? |
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| Dead Letter Channel | What will the messaging system do with a message it cannot deliver? |
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| Guaranteed Delivery | How can the sender make sure that a message will be delivered, even if the messaging system fails? |
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| 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 |
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| Event Message | How can messaging be used to transmit events from one application to another? |
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| Request Reply | When an application sends a message, how can it get a response from the receiver? |
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| Correlation Identifier | How does a requestor that has received a reply know which request this is the reply for? |
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| Return Address | How does a replier know where to send the reply? |
Message Routing |
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| 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? |
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| Message Filter | How can a component avoid receiving uninteresting messages? |
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| Dynamic Router | How can you avoid the dependency of the router on all possible destinations while maintaining its efficiency? |
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| Recipient List | How do we route a message to a list of (static or dynamically) specified recipients? |
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| Splitter | How can we process a message if it contains multiple elements, each of which may have to be processed in a different way? |
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| Aggregator | How do we combine the results of individual, but related messages so that they can be processed as a whole? |
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| Resequencer | How can we get a stream of related but out-of-sequence messages back into the correct order? |
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| 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? | Image Modified
| 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? |
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| 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? | Image Modified
| 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? | Image Modified
| Sampling | How can I sample one message out of many in a given period to avoid downstream route does not get overloaded? | Image Added
| Delayer | How can I delay the sending of a message? | Image Modified
| Load Balancer | How can I balance load across a number of endpoints? | | Hystrix | To use Hystrix Circuit Breaker when calling an external service. | | Service Call | To call a remote service in a distributed system where the service is looked up from a service registry of some sorts. | Image Modified
| Multicast | How can I route a message to a number of endpoints at the same time? | Image Modified
| Loop | How can I repeat processing a message in a loop? |
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| Content Enricher | How do we communicate with another system if the message originator does not have all the required data items available? |
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| Content Filter | How do you simplify dealing with a large message, when you are interested only in a few data items? |
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| Claim Check | How can we reduce the data volume of message sent across the system without sacrificing information content? |
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| Normalizer | How do you process messages that are semantically equivalent, but arrive in a different format? | Image Modified
| Sort | How can I sort the body of a message? | | Script | How do I execute a script which may not change the message? | Image Added
| Validate | How can I validate a message? |
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| Messaging Mapper | How do you move data between domain objects and the messaging infrastructure while keeping the two independent of each other? |
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| Event Driven Consumer | How can an application automatically consume messages as they become available? |
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| Polling Consumer | How can an application consume a message when the application is ready? |
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| Competing Consumers | How can a messaging client process multiple messages concurrently? |
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| Message Dispatcher | How can multiple consumers on a single channel coordinate their message processing? |
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| Selective Consumer | How can a message consumer select which messages it wishes to receive? |
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| Durable Subscriber | How can a subscriber avoid missing messages while it's not listening for them? | Image Modified
| Idempotent Consumer | How can a message receiver deal with duplicate messages? |
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| Messaging Gateway | How do you encapsulate access to the messaging system from the rest of the application? |
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| Service Activator | How can an application design a service to be invoked both via various messaging technologies and via non-messaging techniques? |
System Management |
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| ControlBus | How can we effectively administer a messaging system that is distributed across multiple platforms and a wide geographic area? | Image Added
| Detour | How can you route a message through intermediate steps to perform validation, testing or debugging functions? |
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| Wire Tap | How do you inspect messages that travel on a point-to-point channel? |
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| Message History | How can we effectively analyze and debug the flow of messages in a loosely coupled system? | Image Added
| Log | How can I log processing a message? |
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