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Variables Performance
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created by <a href="http://community.jboss.org/people/andre.muniz">Andre Muniz</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/534048#534048">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi!</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My use case is very simple: I need to load all the pending tasks and show information about them (including variables). But I'm having some performance problems when loading those variables.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Basically my code is like this:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java"><font color="darkgreen">// Builds the process engine</font>
ProcessEngine processEngine = <font color="navy"><b>new</b></font> Configuration().buildProcessEngine();
 
<font color="darkgreen">// Creates the services</font>
TaskService taskService = processEngine.getTaskService();
ExecutionService executionService = processEngine.getExecutionService();
 
<font color="darkgreen">// Loads all the pending tasks</font>
List < Task > tasks = taskService.createTaskQuery().list();
 
<font color="darkgreen">// Loads the variables for each task</font>
<font color="navy"><b>for</b></font> (Task t : tasks) <font color="navy">{</font>
 
     <font color="darkgreen">// Variable names</font>
     Set < String > variableNames = <font color="navy"><b>new</b></font> TreeSet < String >();
     variableNames.add(<font color="red">"var1"</font>);
     variableNames.add(<font color="red">"var2"</font>);
     variableNames.add(<font color="red">"var3"</font>);
     variableNames.add(<font color="red">"var4"</font>);
     variableNames.add(<font color="red">"var5"</font>);
 
     <font color="darkgreen">// Loads the variables</font>
     Map < String, Object > variables = executionService.getVariables(t.getExecutionId(), variableNames);
           
     <font color="darkgreen">// Shows variables information</font>
     System.out.println(variables);
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The "taskService.createTaskQuery().list()" method is very fast, but the processing time to load the variables is very high.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My question is:</p><p>Am I going in the right direction or there is another way to implement this use case with better performance?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span>PS: I've seen the JIRA request to include searching for process instances by variables (</span><a class="jive-link-external-small" href="https://jira.jboss.org/jira/browse/JBPM-2505" target="_blank">https://jira.jboss.org/jira/browse/JBPM-2505</a><span>) and there are some comments about variable performance, but I'm not sure that in my use case I should have this kind of problem.</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks!</p></div>
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