/*
* Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors.
*
* 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.switchyard.component.bpm.runtime;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import javax.persistence.EntityManagerFactory;
import org.jbpm.services.task.HumanTaskServiceFactory;
import org.jbpm.services.task.lifecycle.listeners.TaskLifeCycleEventListener;
import org.kie.api.runtime.Environment;
// SWITCHYARD-1755: internal api usage still required (until jbpm services usage is resolved)
import org.kie.internal.task.api.ContentMarshallerContext;
import org.kie.internal.task.api.EventService;
import org.kie.internal.task.api.InternalTaskService;
import org.kie.internal.task.api.UserGroupCallback;
import org.switchyard.component.bpm.transaction.AS7TransactionHelper;
import org.switchyard.component.common.knowledge.util.Environments;
/**
* The BPM task service.
*
* @author David Ward <<a href="mailto:dward@jboss.org">dward@jboss.org</a>> © 2013 Red Hat Inc.
*/
public interface BPMTaskService extends InternalTaskService, EventService<TaskLifeCycleEventListener> {
/**
* The BPM task service factory.
*/
public static final class Factory {
/**
* Creates a new BPM task service.
* @param environment the environment
* @param entityManagerFactory the entity manager factory
* @param userGroupCallback the user group callback
* @param loader the classloader
* @return the bpm task service
*/
public static final BPMTaskService newTaskService(
Environment environment,
EntityManagerFactory entityManagerFactory,
UserGroupCallback userGroupCallback,
ClassLoader loader) {
InternalTaskService internalTaskService;
if (entityManagerFactory != null) {
internalTaskService = (InternalTaskService)HumanTaskServiceFactory.newTaskServiceConfigurator()
.environment(environment)
.entityManagerFactory(entityManagerFactory)
.userGroupCallback(userGroupCallback)
.getTaskService();
String deploymentId = (String)environment.get(Environments.DEPLOYMENT_ID);
internalTaskService.addMarshallerContext(deploymentId, new ContentMarshallerContext(environment, loader));
} else {
internalTaskService = null;
}
InvocationHandler invocationHandler = new TaskServiceInvocationHandler(internalTaskService);
return (BPMTaskService)Proxy.newProxyInstance(BPMTaskService.class.getClassLoader(), new Class[]{BPMTaskService.class}, invocationHandler);
}
private static final class TaskServiceInvocationHandler implements InvocationHandler {
private final InternalTaskService _internalTaskService;
private TaskServiceInvocationHandler(InternalTaskService internalTaskService) {
_internalTaskService = internalTaskService;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (_internalTaskService == null) {
return null;
} else if (Object.class.equals(method.getDeclaringClass())) {
return method.invoke(_internalTaskService, args);
} else {
Object ret;
AS7TransactionHelper utx = new AS7TransactionHelper(true);
try {
utx.begin();
ret = method.invoke(_internalTaskService, args);
utx.commit();
} catch (Throwable t) {
utx.rollback();
throw t;
}
return ret;
}
}
}
}
}