/*
* Copyright 2011 Red Hat Inc.
*
* 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.drools.persistence.jta;
import bitronix.tm.TransactionManagerServices;
import org.drools.core.base.MapGlobalResolver;
import org.drools.core.command.impl.ExecutableCommand;
import org.drools.core.command.impl.RegistryContext;
import org.drools.core.impl.EnvironmentFactory;
import org.drools.persistence.infinispan.marshaller.InfinispanPlaceholderResolverStrategy;
import org.infinispan.Cache;
import org.infinispan.manager.DefaultCacheManager;
import org.kie.api.runtime.Context;
import org.kie.api.runtime.Environment;
import org.kie.api.runtime.EnvironmentName;
import org.kie.api.runtime.KieSession;
import org.kie.internal.KnowledgeBase;
import org.kie.internal.KnowledgeBaseFactory;
import org.kie.internal.persistence.infinispan.InfinispanKnowledgeService;
import org.kie.internal.runtime.StatefulKnowledgeSession;
import java.io.Serializable;
import java.util.HashMap;
import static org.drools.persistence.jta.JtaTransactionManagerTest.COMMAND_ENTITY_MANAGER;
import static org.drools.persistence.jta.JtaTransactionManagerTest.COMMAND_ENTITY_MANAGER_FACTORY;
/**
* Please make sure you understand foreign keys
* and how they work with regards to JPA before continuing further:
* - http://download.oracle.com/javaee/5/tutorial/doc/bnbqa.html#bnbqj
* - http://en.wikipedia.org/wiki/Foreign_key
*
*
*/
public class TransactionTestCommand implements ExecutableCommand<Void> {
private static final long serialVersionUID = -7640078670024414748L;
private Object mainObject;
private Object subObject;
private Cache<Serializable, Object> cache;
private DefaultCacheManager cm;
public TransactionTestCommand(Object mainObject, Object subObject, HashMap<String, Object> env) {
this.mainObject = mainObject;
this.subObject = subObject;
setPersistenceFields(env);
}
public TransactionTestCommand(Object mainObject, HashMap<String, Object> env) {
this.mainObject = mainObject;
this.subObject = null;
setPersistenceFields(env);
}
@SuppressWarnings("unchecked")
private void setPersistenceFields(HashMap<String, Object> env) {
this.cache = (Cache<Serializable, Object>) env.get(COMMAND_ENTITY_MANAGER);
this.cm = (DefaultCacheManager) env.get(COMMAND_ENTITY_MANAGER_FACTORY);
}
private HashMap<String, Object> getPersistenceEnvironment() {
HashMap<String, Object> env = new HashMap<String, Object>();
env.put(COMMAND_ENTITY_MANAGER, this.cache);
env.put(COMMAND_ENTITY_MANAGER_FACTORY, this.cm);
return env;
}
public Void execute(Context context ) {
//cache.joinTransaction();TODO
TransactionTestObject obj = (TransactionTestObject) mainObject;
if (obj.getId() == null) {
obj.setId(generateId());
}
cache.put(InfinispanPlaceholderResolverStrategy.getClassIdValue(mainObject), mainObject);
if( subObject != null ) {
KieSession ksession = ((RegistryContext) context).lookup( KieSession.class );
// THe following 3 lines are the important ones! (See below for an explanation)
KnowledgeBase cleanKBase = KnowledgeBaseFactory.newKnowledgeBase();
cleanKBase.addKnowledgePackages(((KnowledgeBase)ksession.getKieBase()).getKnowledgePackages());
StatefulKnowledgeSession commandKSession = InfinispanKnowledgeService.newStatefulKnowledgeSession( cleanKBase, null, initializeEnvironment() );
/**
* Here's what's going on:
* If the SingleSessionCommandService (SSCS) & JtaTransactionManager (JTM) were _not_ aware of transactions,
* -> then inserting the mainObject _before_ having inserted the subObject
* would cause the operation/persist to fail and the transaction to fail.
* - This is because the mainObject contains a foreign key referring to the subObject.
*
* However, the SSCS & JTM check whether or not they're owners of the transaction
* when starting and when committing the transaction they use.
* -> So that when we insert the mainObject here (via a _new_ CommandBasedStatefulKnowledgeSession),
* it does _not_ mess with the transaction state and the operation succeeds.
*/
TransactionTestCommand transactionTestSubCommand
= new TransactionTestCommand(this.subObject, getPersistenceEnvironment()); commandKSession.execute(transactionTestSubCommand);
}
return null;
}
private static long value = 1;
private static Long generateId() {
return ++value;
}
private Environment initializeEnvironment() {
Environment env = EnvironmentFactory.newEnvironment();
env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, cm);
env.set(EnvironmentName.GLOBALS, new MapGlobalResolver());
env.set(EnvironmentName.TRANSACTION_MANAGER,
TransactionManagerServices.getTransactionManager());
return env;
}
}