Page Comparison

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Code Block

language	javascript

{"array":[1,2]}

XML (RJsonStreamBuilder):

Code Block

language	html/xml

<jsonObject>
   <array>1</array>
   <array>2</array>
</jsonObject>

XML (JsonBuilder):

Code Block

language	html/xml

<jsonObject>
   <?xml-multiple array?>
   <array>1</array>
   <array>2</array>
</jsonObject>

...

Code Block

language	javascript

{"array":[]}

XML (RJsonStreamBuilder):

Code Block

language	html/xml

<jsonObject></jsonObject>

XML (JsonBuilder):

Code Block

language	html/xml

<jsonObject>
   <?xml-multiple array?>
</jsonObject>

...

Code Block

language	javascript

[1,2]

XML (RJsonStreamBuilder):

Code Block

language	html/xml

<jsonArray>
   <jsonElement>1</jsonElement>
   <jsonElement>2</jsonElement>
</jsonArray>

XML (JsonBuilder):

Code Block

language	html/xml

<jsonArray>
   <?xml-multiple jsonElement?>
   <jsonElement>1</jsonElement>
   <jsonElement>2</jsonElement>
</jsonArray>

...

Code Block

language	javascript

[1, []]

XML (RJsonStreamBuilder):

Code Block

language	html/xml

<jsonArray>
   <jsonElement>1</jsonElement>
   <jsonElement>
       <jsonArray></jsonArray>
   </jsonElement>
</jsonArray>

XML (JsonBuilder):

Code Block

language	html/xml

<jsonArray>
   <?xml-multiple jsonElement?>
   <jsonElement>1</jsonElement>
   <jsonElement>
       <jsonArray>
           <?xml-multiple jsonElement?>
       </jsonArray>
   </jsonElement>
</jsonArray>

...

Code Block

language	html/xml
linenumbers	true

<proxy xmlns="http://ws.apache.org/ns/synapse"
     name="singleresponse"
     transports="https,http"
     statistics="disable"
     trace="disable"
     startOnLoad="true">
     <target>
         <outSequence>
             <payloadFactory media-type="json">
                 <format>{
                             "location_response" : {
                                 "name" : "$1",
                                 "tags" : $2
                         }}
                 </format>
                 <args>
                     <arg evaluator="json" expression="$.name"/>
                     <arg evaluator="json" expression="$.types"/>
                 </args>
             </payloadFactory>
             <send/>
         </outSequence>
         <endpoint>
             <address uri="http://localhost:828018280/location"/>
         </endpoint>
     </target>
 <description/>
</proxy>

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Code Block

language	html/xml
linenumbers	true

<proxy xmlns="http://ws.apache.org/ns/synapse"
       name="locations"
       transports="https,http"
       statistics="disable"
       trace="disable"
       startOnLoad="true">
   <target>
      <outSequence>
         <script language="js"
                 key="conf:/repository/esb/transform.js"
                 function="transform"/>
         <send/>
      </outSequence>
      <endpoint>
         <address uri="http://localhost:828018280/locations"/>
      </endpoint>
   </target>
   <description/>
</proxy>

The registry resource transform.js contains the JavaScript function that perfoms performs the transformation:

Code Block

language	javascript
linenumbers	true

function transform(mc) {
    payload = mc.getPayloadJSON();
    results = payload.results;
    var response = new Array();
    for (i = 0; i < results.length; ++i) {
        location_object = results[i];
        l = new Object();
        l.name = location_object.name;
        l.tags = location_object.types;
        l.id = "ID:" + (location_object.id);
        response[i] = l;
    }
    mc.setPayloadJSON(response);
}

...

Code Block

language	html/xml

<locations>
   <location>
      <id>7eaf7</id>
      <name>Biaggio Cafe</name>
      <tags>bar,restaurant,food,establishment</tags>
   </location>
   <location>
      <id>3ef98</id>
      <name>Doltone House</name>
      <tags>food,establishment</tags>
   </location>
</locations>

Finally, the next section describes how to let's look at how you can perform delete, modify, and add new fields field operations on JSON payloads with the Script Mediator mediator in JavaScript. If we Let's send the JSON message returned by the "the locations" proxy service as the request for the below following proxy service, transformjson:

Code Block

language	html/xml
linenumbers	true

<proxy xmlns="http://ws.apache.org/ns/synapse"
       name="transformjson"
       transports="https,http"
       statistics="disable"
       trace="disable"
       startOnLoad="true">
   <target>
      <inSequence>
         <script language="js"><![CDATA[
           payload = mc.getPayloadJSON();
           for (i = 0; i &lt; payload.length; ++i) {
               payload[i].id_str = payload[i].id;
               delete payload[i].id;
               payload[i].tags[payload[i].tags.length] = "pub";
           }
           mc.setPayloadJSON(payload);
         ]]></script>
         <log>
            <property name="JSON-Payload" expression="json-eval($.)"/>
         </log>
         <respond/>
      </inSequence>
   </target>
   <description/>
</proxy>

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Note that the transformation (line 9 through 17) has added a new field 'id_str' and removed the old field 'id' from the request, and it has added a new tag 'pub' to the existing tags list of the payload.

Following samples For additional examples that demonstrate different ways to manipulate JSON payloads within the ESB mediation flow., see the following samples:

Anchor

	troubleshooting
	troubleshooting

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