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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:

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1. Download and install WSO2 ESB from http://wso2.com/products/enterprise-service-bus. For a list of prerequisites and step-by-step installation instructions, refer to Getting Started in the WSO2 ESB documentation.
2. Start two Sample a sample Axis2 server instances in ports 9001 and 9002. For instructions, refer to the section instance on port 9000. For instructions, see ESB Samples Setup - Starting Sample Back-End Services in the WSO2 ESB documentation.

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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.