Pattern: Correlation Identifier  How does a requestor that has received a reply know which request this is the reply for? But Messaging is asynchronous, so from the caller’s point of view, it makes the call, then sometime later a result appears. The caller may not even remember making the request, or may have made so… Read More Pattern: Correlation Identifier

Pattern: Return Address Each consumer has its own reply queue How does the provider know where to send the reply? Could send to all consumers -> very inefficient Hard code -> violates principle of context-free service Consumer specifies Return Address(reply channel) in the request message Service provider sends reply message to specified channel  This way, the replier… Read More Pattern: Return Address

Messaging Pattern: Request-Reply Request-Reply has two participants: Consumer – Sends a request message and waits for a reply message. Provider – Receives the request message and responds with a reply message Example: SOAP 1.1 Messages SOAP messages come in Request-Reply pairs. A SOAP request message indicates a service the sender wishes to invoke on the… Read More Messaging Pattern: Request-Reply

Catalog of 65 Patterns Integration Styles document different ways applications can be integrated, providing a historical account of integration technologies.  Channel Patterns describe how messages are transported across a Message Channel.  Message Construction Patterns describe the intent, form and content of the messages that travel across the messaging system. The base pattern for this section is the Message pattern. Routing Patterns discuss… Read More Messaging Patterns