Media Type Metadata Selector (.^mediaType)

Returns the MIME type of a value that includes parameters (for example, application/json;charset=UTF-16). The expression in the value of { “myMediaType” : payload.^mediaType } might return “myMediaType”: “/; charset=UTF-8″ for an input POJO.

In the following Mule app flow, the Logger uses payload.^mediaType to select the media type of 2014-10-12T11:11:19-00:03 set in the Set Payload (set-payload) component.

Mule App XML in Anypoint Studio:

<flow name=”setpayloadobjectFlow” >

  <scheduler doc:name=”Scheduler” >

    <scheduling-strategy >

      <fixed-frequency frequency=”15″ timeUnit=”SECONDS”/>

    </scheduling-strategy>

  </scheduler>

  <set-payload value=’#[|2014-10-12T11:11:19-00:03| as DateTime]’ doc:name=”Set Payload” />

  <logger level=”INFO” doc:name=”Logger” message=”#[payload.^mediaType]”/>

</flow>

The Studio console output shows that the DateTime payload has the application/java; charset=UTF-8 media type.

Console Output in Anypoint Studio:

INFO  2019-04-20 16:41:01,276 [[MuleRuntime].cpuLight.04:

 [setpayloadobject].setpayloadobjectFlow.CPU_LITE @7e991c71]

 [event: c0e96860-63c5-11e9-bcff-8c8590a99d48]

 rg.mule.runtime.core.internal.processor.LoggerMessageProcessor:

 application/java; charset=UTF-8

In the following Mule app flow, the Loggers use payload.^mediaType to select a string “my string”, then to select a string that is set within an fx expression (#[“my string as String type” as String]) in the Set Payload (set-payload) component.

Mule App XML in Anypoint Studio:

<flow name=”setpayloadobjectFlow” >

  <scheduler doc:name=”Scheduler” >

    <scheduling-strategy >

      <fixed-frequency frequency=”15″ timeUnit=”SECONDS”/>

    </scheduling-strategy>

  </scheduler>

  <!– Set the payload to “my string”. –>

  <set-payload value='”my string”‘ doc:name=”Set Payload” />

  <!– Select the media type of “my string”. –>

  <logger level=”INFO” doc:name=”Logger” message=’#[payload.^mediaType]’/>

  <!– Set the payload using the fx expression “my string” as String. –>

  <set-payload value=’#[“my string as String type” as String]’ doc:name=”Set Payload” />

  <!– Select the media type of a Java string. –>

  <logger level=”INFO” doc:name=”Logger” message=’#[payload.^mediaType]’/>

</flow>

The Studio console output shows that the simple string has the media type /, while the string that is set in the fx expression has the media type application/java; charset=UTF-8.

Console Output in Anypoint Studio:

INFO  2019-04-20 16:52:50,801 [[MuleRuntime].cpuLight.01:

 [setpayloadobject].setpayloadobjectFlow.CPU_LITE @5d914abe]

 [event: 68121cd0-63c7-11e9-bcff-8c8590a99d48]

 org.mule.runtime.core.internal.processor.LoggerMessageProcessor:

 */*

INFO  2019-04-20 16:52:51,085 [[MuleRuntime].cpuLight.01:

 [setpayloadobject].setpayloadobjectFlow.CPU_LITE @5d914abe]

 [event: 68121cd0-63c7-11e9-bcff-8c8590a99d48]

 org.mule.runtime.core.internal.processor.LoggerMessageProcessor:

 application/java; charset=UTF-8

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