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This section explains, through an example scenario, how the Detour EIP can be implemented using WSO2 ESB. The following topics are covered:

Table of Contents

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  • localEntry [line 2 in ESB config] - Specifies a local entry containing the XML schema to use for validation. 
  • sequence [line 31 in ESB config] - The main sequence for the ESB, which is the default sequence. 
  • filter [line 33 in ESB config] - The filter mediator that is used to provide content based routing. In this case, the SOAP Header field To is matched against a regular expression that checks to see whether the To field contains StockQuote. 
  • validate [line 34 in ESB config] - Performs validation on the SOAP body using the XML Schema defined in the localEntry (line 2 in ESB config). 
  • on-fail [line 36 in ESB config] - If the validation fails, the on-fail element provides a detour, which can be used to channel the message through a different route and ultimately passed on to the intended service. In the example scenario, a fault is produced and the fault is sent back to the requesting client. 
  • send [line 44 in ESB config] - the send mediator is used to send the message to the intended receiver - however if the makeFault inside the on-fail element (line 37 in ESB config) is executed before this mediator is reached, then the fault is returned to the requesting client.