We can't talk about Java messaging without talking about Enterprise integration. Below are some EAI patterns from the EAI patterns bible.
Messaging Systems
Introduction to 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
Introduction to 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?
Datatype Channel
How can the application send a data item such that the receiver will know how to process it?
Invalid Message Channel
How can a messaging receiver gracefully handle receiving a message that makes no sense?
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?
Channel Adapter
How can you connect an application to the messaging system so that it can send and receive messages?
Messaging Bridge
How can multiple messaging systems be connected so that messages available on one are also available on the others?
Message Bus
What is an architecture that enables separate applications to work together, but in a decoupled fashion such that applications can be easily added or removed without affecting the others?Message Construction
Introduction to Message Construction
Command Message
How can messaging be used to invoke a procedure in another application?
Document Message
How can messaging be used to transfer data between applications?
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?
Return Address
How does a replier know where to send the reply?
Correlation Identifier
How does a requestor that has received a reply know which request this is the reply for?
Message Sequence
How can messaging transmit an arbitrarily large amount of data?
Message Expiration
How can a sender indicate when a message should be considered stale and thus shouldn’t be processed?Format Indicator
How can a message’s data format be designed to allow for possible future changes?Interlude: Simple Messaging
Introduction to Simple Messaging Examples
Message Routing
Introduction to 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 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?
Process Manager
How do we route a message through multiple processing steps when the required steps may not be known at design-time and may not be sequential?
Message Broker
How can you decouple the destination of a message from the sender and maintain central control over the flow of messages?Message Transformation
Introduction to Message Transformation
Envelope Wrapper
How can existing systems participate in a messaging exchange that places specific requirements on the message format, such as message header fields or encryption?
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?Canonical Data Model
How can you minimize dependencies when integrating applications that use different data formats?Interlude: Composed Messaging
Introduction to Composed Messaging Examples
Synchronous Implementation using Web Services
Asynchronous Implementation with MSMQ
Asynchronous Implementation with TIBCO ActiveEnterprise
Messaging Endpoints
Introduction to Messaging Endpoints
Messaging Gateway
How do you encapsulate access to the messaging system from the rest of the application?Messaging Mapper
How do you move data between domain objects and the messaging infrastructure while keeping the two independent of each other?
Transactional Client
How can a client control its transactions with the messaging system?
Polling Consumer
How can an application consume a message when the application is ready?
Event-Driven Consumer
How can an application automatically consume messages as they become available?
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 Receiver
How can a message receiver deal with duplicate messages?
Service Activator
How can an application design a service to be invoked both via various messaging technologies and via non-messaging techniques?
1 comment:
Have you seen Apache Camel?. Its a great way of implementing the Enterprise Integration Patterns with ActiveMQ
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