Camel Concepts
A number of Camel architectural concepts are used throughout this book and are briefly explained here to provide a quick reference. Full details can be found on the Apache Camel website at http://camel.apache.org.
A Camel Exchange is a holder object that encapsulates the state of a conversation between systems. It contains properties, a variety of flags, a message exchange pattern or MEP (InOnly or InOut), and two messages (an In message and an Out message). Properties are expressed as a map of Strings to Objects, and are typically used by Camel and its components to store information pertaining to the processing of the exchange.
A message contains the payload to be processed by a processing step, as well as headers that are expressed ...
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