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Point-to-Point Channel

How the caller can be sure that exactly one receiver will receive the document or perform the call.


How the sender broadcasts an event to all interested receivers.


How the application sends a data item such that the receiver will know how to process it.

Invalid Message Channel

How a messaging receiver gracefully handles a message that makes no sense.

What the messaging system does with a message it cannot deliver.

How the sender ensures delivery of a message, even if the messaging system fails.

How to connect an application to the messaging system to send/receive messages.

Messaging Bridge

How multiple messaging systems can be connected so that messages available on one are also available on the others.

Message Bus

An architecture enabling separate applications to work together in a decoupled fashion such that applications can be easily added or removed without affecting the others.

Message Construction

Command Message

How messaging can be used to invoke a procedure in another application.

Document Message

How messaging can be used to transfer data between applications.

How messaging can be used to transmit events from one application to another.

Request-Reply

How an application that sends a message gets a response from the receiver.

How a replier knows where to send the reply.

How a requester that has received a reply knows which request the reply is for.

How messaging can transmit an arbitrarily large amount of data.

Message Expiration

How a sender indicates when a message should be considered stale and therefore should not be processed.


Format Indicator How a message’s data format can be designed to allow for possible future changes.

Message Routing

Content-Based Router

How to handle a situation when the implementation of a single logical function (such as an inventory check) is spread across multiple physical systems.

Message Filter

How a component avoids receiving uninteresting messages.

Dynamic Router

How to avoid the dependency of a router in all possible destinations, while maintaining its efficiency.

How to route a message to a list of dynamically specified recipients.

How to process a message if it contains multiple elements, each of which may have to be processed in a different way.

Aggregator

How to combine the results of individual but related messages so that they can be processed as a whole.

Composed Msg. Processor

How to maintain the overall flow when processing a message consisting of multiple elements, each of which may require different processing.



How to maintain the overall flow when a message needs to be sent to multiple recipients, each of which may send a reply.

Routing Slip

How to route a message consecutively through a series of steps when the sequence of the steps is not known at design time and may vary for each message.

Process Manager

How to 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 to decouple the destination of a message from the sender and maintain central control over the flow of messages.

Resequencer

How to put a stream of related but out-of-sequence messages back into the correct order.

Warning

Currently, you can use this resequencing pattern only through the Management Console of WSO2 Enterprise Service Bus 4.9.0. In future, this will be implemented with Tooling support in latter WSO2 ESB versions.

Message Transformation

How existing systems participate in a messaging exchange, which places specific requirements in the message format, such as message header fields or encryption.

How to communicate with another system if the message originator does not have all the required data items available.

Content Filter

How to simplify dealing with a large message when you are interested only in a few data items.

Claim Check

How to reduce the data volume of a message sent across the system without sacrificing information content.

How to process messages that are semantically equivalent but arrive in a different format.


How to minimize dependencies when integrating applications that use different data formats.

Messaging Endpoints

How to encapsulate access to the messaging system from the rest of the application.



Messaging Mapper How to move data between domain objects and the messaging infrastructure, while keeping the two independent of each other.

Transactional Client

How a client controls its transactions with the messaging system.

Polling Consumer

How an application consumes a message when the application is ready.

How an application automatically consumes messages as they become available.

Competing Consumers

How a messaging client processes multiple messages concurrently.

Message Dispatcher

How multiple consumers on a single channel coordinate their message processing.

Selective Consumer

How a message consumer selects which messages to receive.

How a subscriber avoids missing messages while it is not listening for them.



Idempotent Receiver
How a message receiver deals with duplicate messages.

How an application designs a service to be invoked via both messaging and non-messaging techniques.

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