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9.16. Batch-execution and Command Examples


  1. There is currently no XML schema to support schema validation. This is the basic format. The root element is <batch-execution> and it can contain zero or more commands elements:
    <batch-execution>
    ...
    </batch-execution>
    
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  2. The insert element features an "out-identifier" attribute so the inserted object will be returned as part of the result payload:
    <batch-execution>
       <insert out-identifier='userVar'>
          ...
       </insert>
    </batch-execution>
    
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  3. It's also possible to insert a collection of objects using the <insert-elements> element. This command does not support an out-identifier. The org.domain.UserClass is just an illustrative user object that XStream would serialize:
    <batch-execution>
       <insert-elements>
          <org.domain.UserClass>
             ...
          </org.domain.UserClass>
          <org.domain.UserClass>
             ...
          </org.domain.UserClass>
          <org.domain.UserClass>
             ...
          </org.domain.UserClass>
       </insert-elements>
    </batch-execution>
    
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  4. The <set-global> element sets a global for the session:
    <batch-execution>
       <set-global identifier='userVar'>
          <org.domain.UserClass>
             ...
          </org.domain.UserClass>
       </set-global>
    </batch-execution>
    
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  5. <set-global> also supports two other optional attributes: out and out-identifier. A true value for the boolean out will add the global to the <batch-execution-results> payload, using the name from the identifier attribute. out-identifier works like out but additionally allows you to override the identifier used in the <batch-execution-results> payload:
    <batch-execution>
       <set-global identifier='userVar1' out='true'>
          <org.domain.UserClass>
             ...
          </org.domain.UserClass>
       </set-global>
       <set-global identifier='userVar2' out-identifier='alternativeUserVar2'>
          <org.domain.UserClass>
             ...
          </org.domain.UserClass>
       </set-global>
    </batch-execution>
    
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  6. There is a <get-global> element without contents. It only has an out-identifier attribute. There is no need for an out attribute because retrieving the value is the sole purpose of a <get-global> element:
    <batch-execution>
       <get-global identifier='userVar1' />
       <get-global identifier='userVar2' out-identifier='alternativeUserVar2'/>
    </batch-execution>
    
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  7. The query command supports both parameter and parameterless queries. The name attribute is the name of the query to be called, and the out-identifier is the identifier to be used for the query results in the <execution-results> payload:
    <batch-execution>
       <query out-identifier='cars' name='cars'/>
       <query out-identifier='cars2' name='carsWithParams'>
          <string>red</string>
          <string>blue</string>
       </query>
    </batch-execution>
    
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  8. The <start-process> command accepts optional parameters:
    <batch-execution>
       <startProcess processId='org.drools.actions'>
          <parameter identifier='person'>
             <org.drools.TestVariable>
                <name>John Doe</name>
             </org.drools.TestVariable>
          </parameter>
       </startProcess>
    </batch-execution
    
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  9. The signal event command allows you to identify processes:
    <signal-event process-instance-id='1' event-type='MyEvent'>
       <string>MyValue</string>
    </signal-event>
    
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  10. The complete work item command notifies users when a process is completed:
    <complete-work-item id='" + workItem.getId() + "' >
       <result identifier='Result'>
          <string>SomeOtherString</string>
       </result>
    </complete-work-item>
    
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  11. The abort work item command lets you cancel a process while it is running:
    <abort-work-item id='21' />
    
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