This section explains, through an example scenario, how the Normalizer EIP can be implemented using WSO2 ESB. The following topics are covered:
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- 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 Installation Guide in the WSO2 ESB documentation.
- Start the sample Axis2 server. For instructions, refer to the section Setting Up the ESB Samples Setup - Starting Sample Back-End Servicesthe Axis2 server in the WSO2 ESB documentation.
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Simulating the sample scenario
You can test this configuration for JSON, SOAP, and POX messages using the sample Axis2 client that comes with WSO2 ESB. You can find examples below.
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- filter [line 9 in ESB config] - The Filter mediator looks for a particular XPath expression inside the request message. If the expression evaluates successfully, it is assumed to be a SOAP or POX message, and the mediation continues through the sequence
sendSeq. If the expression does not evaluate, it is assumed to be a JSON message, and the mediation continues via thejsonInTransformSeqsequence. - localEntry [line 30 in ESB config] - The local entry holds an XSL transformation that converts JSON requests to XML.
- xslt [line 47 in ESB config] - The XSLT mediator applies the defined XSLT to the payload.
- address [line 55 in ESB config] - The address element of the endpoint defines the back-end service and the message format that back-end service prefers. This format is used to normalize a message further, but only when there can be a 1-to-1 mapping between two different formats, for example, between SOAP 1.1 and SOAP 1.2.