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MTOM and SwA Optimizations and Request/Response Correlation

This sample demonstrates how you can use content optimization mechanisms such as Message Transmission Optimization Mechanism (MTOM) and SOAP with Attachments (SwA) with the Micro Integrator.

By default, the Micro Integrator serializes binary data as Base64 encoded strings and sends them in the SOAP payload. MTOM and SwA define mechanisms over which files with binary content can be transmitted over SOAP web services.

The configuration sets a local message context property, and forwards the message to http://localhost:9000/services/MTOMSwASampleService optimizing the binary content as MTOM. You can see the actual message sent over the http transport if required by sending this message through TCPMon.

During response processing, the Micro Integrator can identify the past information (by checking the local message property) about the current message context, and use this knowledge to transfer the response back to the client in the same format as the original request.

Synapse configuration

Following are the integration artifacts that we can used to implement this scenario. See the instructions on how to build and run this example.

<sequence name="main">
    <in>
        <filter source="get-property('Action')" regex="urn:uploadFileUsingMTOM">
            <property name="example" value="mtom"/>
            <send>
                <endpoint>
                    <address uri="http://localhost:9000/services/MTOMSwASampleService" optimize="mtom"/>
                </endpoint>
            </send>
        </filter>
        <filter source="get-property('Action')" regex="urn:uploadFileUsingSwA">
            <property name="example" value="swa"/>
            <send>
                <endpoint>
                    <address uri="http://localhost:9000/services/MTOMSwASampleService" optimize="swa"/>
                </endpoint>
            </send>
        </filter>
    </in>
    <out>
        <filter source="get-property('example')" regex="mtom">
            <property name="enableMTOM" value="true" scope="axis2"/>
        </filter>
        <filter source="get-property('example')" regex="swa">
            <property name="enableSwA" value="true" scope="axis2"/>
        </filter>
        <send/>
    </out>
</sequence>

Build and run

Create the artifacts:

  1. Set up WSO2 Integration Studio.
  2. Open the deployment.toml file (stored in the MI_HOME/conf directory) and add the following configurations:

    • To enable MTOM:

      [server]
      enable_mtom = true
      When this is enabled, all outgoing messages will be serialized and sent as MTOM optimized MIME messages.You can override this configuration per service in the services.xml configuration file.

    • To enable SwA:

      [server]
      enable_swa = true
      When this is enabled, incoming SwA messages are automatically identified by the Micro Integrator.

  3. Create an ESB Solution project.

  4. Create the main sequence with the configurations given above.
  5. Deploy the artifacts in your Micro Integrator.

When your client executes successfully, it will upload a file containing the ASF logo, receive its response, and save the response to a temporary file.

If you use TCPMon and send the message through it, you will see that the requests and responses sent are MTOM/SwA optimized or sent as http attachments as follows:

  • MTOM

    POST http://localhost:9000/services/MTOMSwASampleService HTTP/1.1
    Host: 127.0.0.1
    SOAPAction: urn:uploadFileUsingMTOM
    Content-Type: multipart/related; boundary=MIMEBoundaryurn_uuid_B94996494E1DD5F9B51177413845353; type="application/xop+xml";
    start="<0.urn:uuid:B94996494E1DD5F9B51177413845354@apache.org>"; start-info="text/xml"; charset=UTF-8
    Transfer-Encoding: chunked
    Connection: Keep-Alive
    User-Agent: Synapse-HttpComponents-NIO
    
    --MIMEBoundaryurn_uuid_B94996494E1DD5F9B51177413845353241
    Content-Type: application/xop+xml; charset=UTF-8; type="text/xml"
    Content-Transfer-Encoding: binary
    Content-ID:
       <0.urn:uuid:B94996494E1DD5F9B51177413845354@apache.org>221b1
          <?xml version='1.0' encoding='UTF-8'?>
             <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
                <soapenv:Body>
                   <m0:uploadFileUsingMTOM xmlns:m0="http://www.apache-synapse.org/test">
                      <m0:request>
                         <m0:image>
                            <xop:Include href="cid:1.urn:uuid:78F94BC50B68D76FB41177413845003@apache.org" xmlns:xop="http://www.w3.org/2004/08/xop/include" />
                         </m0:image>
                      </m0:request>
                   </m0:uploadFileUsingMTOM>
                </soapenv:Body>
             </soapenv:Envelope>
    --MIMEBoundaryurn_uuid_B94996494E1DD5F9B51177413845353217
    Content-Type: image/gif
    Content-Transfer-Encoding: binary
    Content-ID:
             <1.urn:uuid:78F94BC50B68D76FB41177413845003@apache.org>22800GIF89a... << binary content >>
  • SWA

    POST http://localhost:9000/services/MTOMSwASampleService HTTP/1.1
    Host: 127.0.0.1
    SOAPAction: urn:uploadFileUsingSwA
    Content-Type: multipart/related; boundary=MIMEBoundaryurn_uuid_B94996494E1DD5F9B51177414170491; type="text/xml";
    start="<0.urn:uuid:B94996494E1DD5F9B51177414170492@apache.org>"; charset=UTF-8
    Transfer-Encoding: chunked
    Connection: Keep-Alive
    User-Agent: Synapse-HttpComponents-NIO
    
    --MIMEBoundaryurn_uuid_B94996494E1DD5F9B51177414170491225
    Content-Type: text/xml; charset=UTF-8
    Content-Transfer-Encoding: 8bit
    Content-ID:
       <0.urn:uuid:B94996494E1DD5F9B51177414170492@apache.org>22159
          <?xml version='1.0' encoding='UTF-8'?>
             <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
                <soapenv:Body>
                   <m0:uploadFileUsingSwA xmlns:m0="http://www.apache-synapse.org/test">
                      <m0:request>
                         <m0:imageId>urn:uuid:15FD2DA2584A32BF7C1177414169826</m0:imageId>
                      </m0:request>
                   </m0:uploadFileUsingSwA>
                </soapenv:Body>
             </soapenv:Envelope>22--34MIMEBoundaryurn_uuid_B94996494E1DD5F9B511774141704912
    17
    Content-Type: image/gif
    Content-Transfer-Encoding: binary
    Content-ID:
             <urn:uuid:15FD2DA2584A32BF7C1177414169826>22800GIF89a... << binary content >>
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