These mediators act as predefined filters. Messages which are in the in path of the ESB will traverse through the child mediators of the in mediator. Messages which are in the out path of ESB will traverse through the child mediators of out mediator.
In
<in> mediator+ </in>
Out
<out> mediator+ </out>
None.
<syn:sequence name="main" xmlns:syn="http://ws.apache.org/ns/synapse"> <syn:in> <syn:log level="full"/> <syn:filter source="get-property('To')" regex="http://localhost:9000.*"> <syn:send/> </syn:filter> </syn:in> <syn:out> <syn:send/> </syn:out> </syn:sequence>
Main sequence with in and out mediators. Messages coming to the ESB will be sent using wsa:to address and responses will be sent back to the requester.
These mediators are pointless to be used in proxy service sequences. Proxy services has predefined sequences for in messages and out message.