org.camunda.bpm.engine.impl.bpmn.behavior.ServiceTaskExpressionActivityBehavior Maven / Gradle / Ivy
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* Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
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* ownership. Camunda licenses this file to you under the Apache License,
* Version 2.0; you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
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package org.camunda.bpm.engine.impl.bpmn.behavior;
import java.util.concurrent.Callable;
import org.camunda.bpm.engine.delegate.Expression;
import org.camunda.bpm.engine.impl.pvm.delegate.ActivityExecution;
/**
* ActivityBehavior that evaluates an expression when executed. Optionally, it
* sets the result of the expression as a variable on the execution.
*
* @author Tom Baeyens
* @author Christian Stettler
* @author Frederik Heremans
* @author Slawomir Wojtasiak (Patch for ACT-1159)
* @author Falko Menge
*/
public class ServiceTaskExpressionActivityBehavior extends TaskActivityBehavior {
protected Expression expression;
protected String resultVariable;
public ServiceTaskExpressionActivityBehavior(Expression expression, String resultVariable) {
this.expression = expression;
this.resultVariable = resultVariable;
}
@Override
public void performExecution(final ActivityExecution execution) throws Exception {
executeWithErrorPropagation(execution, new Callable() {
@Override
public Void call() throws Exception {
//getValue() can have side-effects, that's why we have to call it independently from the result variable
Object value = expression.getValue(execution);
if (resultVariable != null) {
execution.setVariable(resultVariable, value);
}
leave(execution);
return null;
}
});
}
}