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Figure 1: Message Bus EIP
How WSO2 ESB
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implements the EIP
The architecture of the WSO2 ESB is discussed in ESB Architecture of the WSO2 ESB documentation. It illustrates how application logic is layered, and how each of the application logic is separated as a mediator where the message processing is done in a decoupled manner. The mediation process is explained in Message Mediation section of the WSO2 ESB documentation.
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According to the configuration above, the ESB routes an incoming message to a back-end server if the conditions mentioned in the filer section are met. Note how each application's logic is decoupled. It uses one component for filtering, and another to send a message to the endpoint. If a user decides to remove the filtering step, s/he can remove the filter mediator segment from the XML. This will not affect the application's logic on sending the message to the back-end.
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