/* Licensed under the Apache License, Version 2.0 (the "License");
* 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,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.camunda.bpm.engine.impl.bpmn.behavior;
import static org.camunda.bpm.engine.impl.util.ClassDelegateUtil.applyFieldDeclaration;
import java.util.List;
import java.util.concurrent.Callable;
import org.camunda.bpm.application.ProcessApplicationReference;
import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.delegate.BpmnError;
import org.camunda.bpm.engine.delegate.Expression;
import org.camunda.bpm.engine.delegate.JavaDelegate;
import org.camunda.bpm.engine.impl.bpmn.delegate.ActivityBehaviorInvocation;
import org.camunda.bpm.engine.impl.bpmn.delegate.JavaDelegateInvocation;
import org.camunda.bpm.engine.impl.bpmn.helper.ErrorPropagation;
import org.camunda.bpm.engine.impl.bpmn.parser.FieldDeclaration;
import org.camunda.bpm.engine.impl.context.Context;
import org.camunda.bpm.engine.impl.context.ProcessApplicationContextUtil;
import org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity;
import org.camunda.bpm.engine.impl.pvm.delegate.ActivityBehavior;
import org.camunda.bpm.engine.impl.pvm.delegate.ActivityExecution;
import org.camunda.bpm.engine.impl.pvm.delegate.SignallableActivityBehavior;
/**
* {@link ActivityBehavior} used when 'delegateExpression' is used
* for a serviceTask.
*
* @author Joram Barrez
* @author Josh Long
* @author Slawomir Wojtasiak (Patch for ACT-1159)
* @author Falko Menge
*/
public class ServiceTaskDelegateExpressionActivityBehavior extends TaskActivityBehavior {
protected Expression expression;
private final List<FieldDeclaration> fieldDeclarations;
public ServiceTaskDelegateExpressionActivityBehavior(Expression expression, List<FieldDeclaration> fieldDeclarations) {
this.expression = expression;
this.fieldDeclarations = fieldDeclarations;
}
@Override
public void signal(final ActivityExecution execution, final String signalName, final Object signalData) throws Exception {
ProcessApplicationReference targetProcessApplication = ProcessApplicationContextUtil.getTargetProcessApplication((ExecutionEntity) execution);
if (!ProcessApplicationContextUtil.requiresContextSwitch(targetProcessApplication)) {
Object delegate = expression.getValue(execution);
applyFieldDeclaration(fieldDeclarations, delegate);
ActivityBehavior activityBehaviorInstance = getActivityBehaviorInstance(execution, delegate);
if (activityBehaviorInstance instanceof SignallableActivityBehavior) {
try {
((SignallableActivityBehavior) activityBehaviorInstance).signal(execution, signalName, signalData);
}
catch (BpmnError error) {
ErrorPropagation.propagateError(error, execution);
}
catch (Exception exception) {
ErrorPropagation.propagateException(exception, execution);
}
}
} else {
Context.executeWithinProcessApplication(new Callable<Void>() {
public Void call() throws Exception {
try {
signal(execution, signalName, signalData);
}
catch (BpmnError error) {
ErrorPropagation.propagateError(error, execution);
}
catch (Exception exception) {
ErrorPropagation.propagateException(exception, execution);
}
return null;
}
}, targetProcessApplication);
}
}
public void execute(ActivityExecution execution) throws Exception {
try {
// Note: we can't cache the result of the expression, because the
// execution can change: eg. delegateExpression='${mySpringBeanFactory.randomSpringBean()}'
Object delegate = expression.getValue(execution);
applyFieldDeclaration(fieldDeclarations, delegate);
if (delegate instanceof ActivityBehavior) {
Context.getProcessEngineConfiguration()
.getDelegateInterceptor()
.handleInvocation(new ActivityBehaviorInvocation((ActivityBehavior) delegate, execution));
} else if (delegate instanceof JavaDelegate) {
Context.getProcessEngineConfiguration()
.getDelegateInterceptor()
.handleInvocation(new JavaDelegateInvocation((JavaDelegate) delegate, execution));
leave(execution);
} else {
throw new ProcessEngineException("Delegate expression " + expression
+ " did neither resolve to an implementation of " + ActivityBehavior.class
+ " nor " + JavaDelegate.class);
}
} catch (Exception exc) {
Throwable cause = exc;
BpmnError error = null;
while (cause != null) {
if (cause instanceof BpmnError) {
error = (BpmnError) cause;
break;
}
cause = cause.getCause();
}
if (error != null) {
ErrorPropagation.propagateError(error, execution);
} else {
ErrorPropagation.propagateException(exc, execution);
}
}
}
protected ActivityBehavior getActivityBehaviorInstance(ActivityExecution execution, Object delegateInstance) {
if (delegateInstance instanceof ActivityBehavior) {
return determineBehaviour((ActivityBehavior) delegateInstance, execution);
} else if (delegateInstance instanceof JavaDelegate) {
return determineBehaviour(new ServiceTaskJavaDelegateActivityBehavior((JavaDelegate) delegateInstance), execution);
} else {
throw new ProcessEngineException(delegateInstance.getClass().getName() + " doesn't implement " + JavaDelegate.class.getName() + " nor "
+ ActivityBehavior.class.getName());
}
}
// Adds properties to the given delegation instance (eg multi instance) if needed
protected ActivityBehavior determineBehaviour(ActivityBehavior delegateInstance, ActivityExecution execution) {
if (hasMultiInstanceCharacteristics()) {
((AbstractBpmnActivityBehavior) delegateInstance).setMultiInstanceActivityBehavior(multiInstanceActivityBehavior);
}
return delegateInstance;
}
}