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Synapse supports Mediators implemented in a variety of scripting languages such as JavaScript, Python or Ruby. There are two ways of defining the Script Mediators:

1. With the script program statements stored in a separate file, referenced via the Local or Remote Registry entry.

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For both types of script mediator definitions, the MessageContext passed into the script has additional methods over the standard Synapse MessageContext to enable working with XML natural to the scripting language. Example are when using JavaScript getPayloadXML and setPayloadXML, E4X XML objects and when using Ruby, REXML documents.

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Syntax

Script Mediator Using a Script of the Registry

<script key="string" language="string" [function="script-function-name"]/>

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Script mediator using a In-lined script

<script language="string">...script source code...<script/>

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Example

1.

<script language="js">mc.getPayloadXML()..symbol != "IBM";<script/>

The above configuration is an example of an inline mediator using JavaScript/E4X which returns false if the SOAP message body contains an element named symbol, which has a value of IBM.

2.

<script language="js"
    key="repository/conf/sample/resources/script/test.js"
    function="testFunction"/>

In the above example, script is loaded from the registry by using the key repository/conf/sample/resources/script/test.js. The script is written in Java script. The function to be invoked is testFunction. An example of test.js is shown bellow:

3.

function testFunction(mc) {
     var symbol = mc.getPayloadXML()..*::Code.toString();
     mc.setPayloadXML(
        <m:getQuote xmlns:m="http://services.samples/xsd">
           <m:request>
              <m:symbol>{symbol}</m:symbol>
           </m:request>
        </m:getQuote>);
}