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Publish Event Mediator

The Publish Event mediator constructs events and publishes them to different systems such as BAM and CEP. This is done via event sinks.

Info

The Publish Event mediator is a content-aware mediator.

Syntax

<publishEvent>
    <eventSink>String</eventSink>
    <streamName>String</streamName>
    <streamVersion>String</streamVersion>
    <attributes>
        <meta>
            <attribute name="string" type="dataType" default="" (value="literal" | expression="[XPath") />
        </meta>
        <correlation>
             <attribute name="string" type="dataType" default="" (value="literal" | expression="[XPath") />
        </correlation>
        <payload>
             <attribute name="string" type="dataType" default="" (value="literal" | expression="[XPath") />
        </payload>
    <arbitrary>
             <attribute name="string" type="dataType" default="" value="literal" />
        </arbitrary>
    </attributes>
</publishEvent>

Configuration

Parameters that can be configured for the Publish Event mediator are as follows.

Parameter Name Description
Stream Name The name of the stream to be used for sending data.
Stream Version The version of the stream to be used for sending data.
EventSink The name of the event sink to which the events should be published.

You can add the following four types of attributes to a Publish Event mediator configuration.

Meta Attributes : The list of attributes which are included in the Meta section of the event.
Correlated Attributes : The list of attributes that are included in the Correlated section of the event.
Payload Attributes : The list of attributes that are included in the Payload section of the event.
Arbitrary Attributes : The list of attributes that are included in the Arbitrary section of the event.

The parameters that are available to configure an individual attribute are as follows.

Parameter Name Description
Attribute Name The name of the attribute.
Attribute Value

This parameter specifies whether the value of the attribute should be a static value or an expression.

  • Value : Select this if the attribute value should be a static value, and enter the relevant value in the Value/Expression parameter.
  • Expression : Select this if the attribute value should be evaluated via an XPath expression, and enter the relevant expression in the Value/Expression parameter.
Value/Expression The value of the attribute. You can enter a static value, or an expression to evaluate the value depending on the selection made in the Attribute Value parameter.
Type The data type of the attribute.
Action Click Delete in the relevant row to delete an attribute.

Example

In this configuration, the Publish Event mediator uses four attributes to extract information from the Micro Integrator. This information is published in an event sink in the Micro Integrator named sample_event_sink.

<publishEvent>
  <eventSink>sample_event_sink</eventSink>
  <streamName>stream_88</streamName>
  <streamVersion>1.1.2</streamVersion>
  <attributes>
     <meta>
        <attribute name="http_method"
                   type="STRING"
                   defaultValue=""
                   expression="get-property('axis2', 'HTTP_METHOD')"/>
        <attribute name="destination"
                   type="STRING"
                   defaultValue=""
                   expression="get-property('To')"/>
     </meta>
     <correlation>
        <attribute name="date"
                   type="STRING"
                   defaultValue=""
                   expression="get-property('SYSTEM_DATE')"/>
     </correlation>
     <payload>
        <attribute xmlns:m0="http://services.samples"
                   name="symbol"
                   type="STRING"
                   defaultValue=""
                   expression="$body/m0:getQuote/m0:request/m0:symbol"/>
     </payload>
  </attributes>
</publishEvent>
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