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Message Exchange
To support various message exchange patterns
like one way Event Message and
Request Reply messages Camel
uses an Exchange interface which has an Exchange Pattern
property which can be set to InOnly for an
Event Message which has a single inbound Message,
or InOut for a Request Reply
where there is an inbound and outbound Message.
Implementation Details
There are concrete classes that implement the Exchange interface for each Camel-supported communications technology. For example, the JmsExchange class provides a JMS-specific implementation of the Exchange interface. The public API of the Exchange interface is limited intentionally: we expect that each class that implements this interface will provide its own technology-specific operations.
Application-level programmers rarely access the Exchange interface (or classes that implement it) directly. However, many classes in Camel are generic types that are instantiated on (a class that implements) Exchange. Because of this, the Exchange interface appears a lot in the generic signatures of classes and methods.