/* 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.activiti.engine.impl.bpmn.behavior;
import java.util.List;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.delegate.BpmnError;
import org.activiti.engine.delegate.Expression;
import org.activiti.engine.delegate.JavaDelegate;
import org.activiti.engine.impl.bpmn.helper.ClassDelegate;
import org.activiti.engine.impl.bpmn.helper.ErrorPropagation;
import org.activiti.engine.impl.bpmn.parser.FieldDeclaration;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.delegate.ActivityBehaviorInvocation;
import org.activiti.engine.impl.delegate.JavaDelegateInvocation;
import org.activiti.engine.impl.pvm.delegate.ActivityBehavior;
import org.activiti.engine.impl.pvm.delegate.ActivityExecution;
import org.activiti.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(ActivityExecution execution, String signalName, Object signalData) throws Exception {
Object delegate = expression.getValue(execution);
if( delegate instanceof SignallableActivityBehavior){
((SignallableActivityBehavior) delegate).signal( execution , signalName , signalData);
}
}
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);
ClassDelegate.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 ActivitiException("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 {
throw exc;
}
}
}
}