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JPA implementation for Drools
/*
* Copyright 2011 Red Hat, Inc. and/or its affiliates.
*
* 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;
import org.drools.core.SessionConfiguration;
import org.drools.core.command.CommandService;
import org.drools.core.command.Interceptor;
import org.drools.core.command.impl.AbstractInterceptor;
import org.drools.core.command.impl.ContextImpl;
import org.drools.core.command.impl.DefaultCommandService;
import org.drools.core.command.impl.FixedKnowledgeCommandContext;
import org.drools.core.command.impl.KnowledgeCommandContext;
import org.drools.core.command.runtime.DisposeCommand;
import org.drools.core.command.runtime.UnpersistableCommand;
import org.drools.core.common.EndOperationListener;
import org.drools.core.common.InternalKnowledgeRuntime;
import org.drools.core.common.InternalWorkingMemory;
import org.drools.core.marshalling.impl.KieSessionInitializer;
import org.drools.core.marshalling.impl.MarshallingConfigurationImpl;
import org.drools.core.runtime.process.InternalProcessRuntime;
import org.drools.core.time.impl.CommandServiceTimerJobFactoryManager;
import org.drools.core.time.impl.TimerJobFactoryManager;
import org.drools.persistence.info.SessionInfo;
import org.drools.persistence.jpa.JpaPersistenceContextManager;
import org.drools.persistence.jpa.processinstance.JPAWorkItemManager;
import org.kie.api.KieBase;
import org.kie.api.command.BatchExecutionCommand;
import org.kie.api.command.Command;
import org.kie.api.marshalling.ObjectMarshallingStrategy;
import org.kie.api.runtime.Environment;
import org.kie.api.runtime.EnvironmentName;
import org.kie.api.runtime.KieSession;
import org.kie.api.runtime.KieSessionConfiguration;
import org.kie.internal.command.Context;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Constructor;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedList;
public class SingleSessionCommandService
implements
org.drools.core.command.SingleSessionCommandService {
private static Logger logger = LoggerFactory.getLogger( SingleSessionCommandService.class );
private SessionInfo sessionInfo;
private SessionMarshallingHelper marshallingHelper;
private KieSession ksession;
private Environment env;
private KnowledgeCommandContext kContext;
private CommandService commandService;
private TransactionManager txm;
private PersistenceContextManager jpm;
private volatile boolean doRollback;
private LinkedList interceptors = new LinkedList();
public void checkEnvironment(Environment env) {
if ( env.get( EnvironmentName.ENTITY_MANAGER_FACTORY ) == null &&
env.get( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER ) == null ) {
throw new IllegalArgumentException( "Environment must have an EntityManagerFactory " +
"or a PersistenceContextManager instance" );
}
}
public SingleSessionCommandService(KieBase kbase,
KieSessionConfiguration conf,
Environment env) {
if ( conf == null ) {
conf = SessionConfiguration.newInstance();
}
this.env = env;
checkEnvironment( this.env );
initTransactionManager( this.env );
initNewKnowledgeSession(kbase, conf);
// Use the App scoped EntityManager if the user has provided it, and it is open.
// - open the entity manager before the transaction begins.
PersistenceContext persistenceContext = jpm.getApplicationScopedPersistenceContext();
boolean transactionOwner = false;
try {
transactionOwner = txm.begin();
registerRollbackSync();
persistenceContext.joinTransaction();
this.sessionInfo = persistenceContext.persist( this.sessionInfo );
registerUpdateSync();
txm.commit( transactionOwner );
} catch ( RuntimeException re ) {
rollbackTransaction( re,
transactionOwner );
throw re;
} catch ( Exception t1 ) {
rollbackTransaction( t1,
transactionOwner );
throw new RuntimeException( "Wrapped exception see cause",
t1 );
}
// update the session id to be the same as the session info id
((InternalKnowledgeRuntime) ksession).setId( this.sessionInfo.getId());
}
protected void initNewKnowledgeSession(KieBase kbase, KieSessionConfiguration conf) {
this.sessionInfo = new SessionInfo();
// create session but bypass command service
this.ksession = kbase.newKieSession( conf,
this.env );
this.marshallingHelper = new SessionMarshallingHelper( this.ksession, conf );
MarshallingConfigurationImpl config = (MarshallingConfigurationImpl) this.marshallingHelper.getMarshaller().getMarshallingConfiguration();
config.setMarshallProcessInstances( false );
config.setMarshallWorkItems( false );
this.sessionInfo.setJPASessionMashallingHelper( this.marshallingHelper );
((InternalKnowledgeRuntime) this.ksession).setEndOperationListener( new EndOperationListenerImpl(this.txm, this.sessionInfo ) );
this.kContext = new FixedKnowledgeCommandContext( new ContextImpl( "ksession", null),
null,
null,
this.ksession,
null );
this.commandService = new TransactionInterceptor(kContext);
TimerJobFactoryManager timerJobFactoryManager = ((InternalKnowledgeRuntime) ksession ).getTimerService().getTimerJobFactoryManager();
if (timerJobFactoryManager instanceof CommandServiceTimerJobFactoryManager) {
( (CommandServiceTimerJobFactoryManager) timerJobFactoryManager ).setCommandService( this );
}
}
public SingleSessionCommandService( Long sessionId,
KieBase kbase,
KieSessionConfiguration conf,
Environment env) {
if ( conf == null ) {
conf = SessionConfiguration.newInstance();
}
this.env = env;
checkEnvironment( this.env );
initTransactionManager( this.env );
// Open the entity manager before the transaction begins.
PersistenceContext persistenceContext = jpm.getApplicationScopedPersistenceContext();
boolean transactionOwner = false;
try {
transactionOwner = txm.begin();
registerRollbackSync();
persistenceContext.joinTransaction();
initExistingKnowledgeSession( sessionId,
kbase,
conf,
persistenceContext );
registerUpdateSync();
txm.commit( transactionOwner );
} catch (SessionNotFoundException e){
// do not rollback transaction otherwise it will mark it as aborted
// making the whole operation to fail if not transaction owner
if (transactionOwner) {
rollbackTransaction( e, transactionOwner, false );
}
throw e;
} catch ( RuntimeException re ) {
rollbackTransaction( re,
transactionOwner );
throw re;
} catch ( Exception t1 ) {
rollbackTransaction( t1,
transactionOwner );
throw new RuntimeException( "Wrapped exception see cause",
t1 );
}
}
protected void initExistingKnowledgeSession(Long sessionId,
KieBase kbase,
KieSessionConfiguration conf,
PersistenceContext persistenceContext) {
if ( !doRollback && this.ksession != null ) {
return;
// nothing to initialise
}
this.doRollback = false;
try {
// if locking is active, this will also lock the (found) SessionInfo instance
this.sessionInfo = persistenceContext.findSessionInfo( sessionId );
} catch ( Exception e ) {
throw new SessionNotFoundException( "Could not find session data for id " + sessionId,
e );
}
if ( sessionInfo == null ) {
throw new SessionNotFoundException( "Could not find session data for id " + sessionId );
}
if ( this.marshallingHelper == null ) {
// this should only happen when this class is first constructed
this.marshallingHelper = new SessionMarshallingHelper( kbase,
conf,
env );
MarshallingConfigurationImpl config = (MarshallingConfigurationImpl)
this.marshallingHelper.getMarshaller().getMarshallingConfiguration();
config.setMarshallProcessInstances( false );
config.setMarshallWorkItems( false );
}
this.sessionInfo.setJPASessionMashallingHelper(this.marshallingHelper);
// if this.ksession is null, it'll create a new one, else it'll use the existing one
this.ksession = this.marshallingHelper.loadSnapshot( this.sessionInfo.getData(), this.ksession, new JpaSessionInitializer(this) );
// update the session id to be the same as the session info id
InternalKnowledgeRuntime kruntime = ((InternalKnowledgeRuntime) ksession);
kruntime.setId( this.sessionInfo.getId() );
kruntime.setEndOperationListener( new EndOperationListenerImpl( this.txm, this.sessionInfo ) );
if ( this.kContext == null ) {
// this should only happen when this class is first constructed
this.kContext = new FixedKnowledgeCommandContext( new ContextImpl( "ksession", null),
null,
null,
this.ksession,
null );
}
this.commandService = new TransactionInterceptor(kContext);
// apply interceptors
Iterator iterator = this.interceptors.descendingIterator();
while (iterator.hasNext()) {
addInterceptor(iterator.next(), false);
}
}
public class JpaSessionInitializer implements KieSessionInitializer {
private final SingleSessionCommandService commandService;
public JpaSessionInitializer( SingleSessionCommandService commandService ) {
this.commandService = commandService;
}
@Override
public void init( KieSession ksession ) {
// The CommandService for the TimerJobFactoryManager must be set before any timer jobs are scheduled.
// Otherwise, if overdue jobs are scheduled (and then run before the .commandService field can be set),
// they will retrieve a null commandService (instead of a reference to this) and fail.
TimerJobFactoryManager timerJobFactoryManager = ((InternalKnowledgeRuntime) ksession ).getTimerService().getTimerJobFactoryManager();
if (timerJobFactoryManager instanceof CommandServiceTimerJobFactoryManager) {
( (CommandServiceTimerJobFactoryManager) timerJobFactoryManager ).setCommandService( commandService );
}
}
}
public void initTransactionManager(Environment env) {
Object tm = env.get( EnvironmentName.TRANSACTION_MANAGER );
if ( env.get( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER ) != null &&
env.get( EnvironmentName.TRANSACTION_MANAGER ) != null ) {
this.txm = (TransactionManager) tm;
this.jpm = (PersistenceContextManager) env.get( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER );
} else {
if ( tm != null && isSpringTransactionManager(tm.getClass()) ) {
try {
logger.debug( "Instantiating KieSpringTransactionManager" );
Class< ? > cls = Class.forName( "org.kie.spring.persistence.KieSpringTransactionManager" );
Constructor< ? > con = cls.getConstructors()[0];
this.txm = (TransactionManager) con.newInstance( tm );
env.set( EnvironmentName.TRANSACTION_MANAGER, this.txm );
cls = Class.forName( "org.kie.spring.persistence.KieSpringJpaManager" );
con = cls.getConstructors()[0];
this.jpm = (PersistenceContextManager) con.newInstance( this.env );
} catch ( Exception e ) {
//fall back for drools5-legacy spring module
logger.warn( "Could not instantiate KieSpringTransactionManager. Trying with DroolsSpringTransactionManager." );
try {
logger.debug( "Instantiating DroolsSpringTransactionManager" );
Class< ? > cls = Class.forName( "org.drools.container.spring.beans.persistence.DroolsSpringTransactionManager" );
Constructor< ? > con = cls.getConstructors()[0];
this.txm = (TransactionManager) con.newInstance( tm );
env.set( EnvironmentName.TRANSACTION_MANAGER, this.txm );
// configure spring for JPA and local transactions
cls = Class.forName( "org.drools.container.spring.beans.persistence.DroolsSpringJpaManager" );
con = cls.getConstructors()[0];
this.jpm = (PersistenceContextManager) con.newInstance( this.env );
} catch ( Exception ex ) {
logger.warn( "Could not instantiate DroolsSpringTransactionManager" );
throw new RuntimeException( "Could not instantiate org.kie.container.spring.beans.persistence.DroolsSpringTransactionManager", ex );
}
}
} else {
logger.debug( "Instantiating JtaTransactionManager" );
this.txm = TransactionManagerFactory.get().newTransactionManager(env);
env.set( EnvironmentName.TRANSACTION_MANAGER, this.txm );
try {
Class< ? > jpaPersistenceCtxMngrClass = Class.forName( "org.jbpm.persistence.JpaProcessPersistenceContextManager" );
Constructor< ? > jpaPersistenceCtxMngrCtor = jpaPersistenceCtxMngrClass.getConstructors()[0];
this.jpm = (PersistenceContextManager) jpaPersistenceCtxMngrCtor.newInstance( this.env );
} catch ( ClassNotFoundException e ) {
this.jpm = new JpaPersistenceContextManager( this.env );
} catch ( Exception e ) {
throw new RuntimeException( "Error creating JpaProcessPersistenceContextManager",
e );
}
}
env.set( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER,
this.jpm );
env.set( EnvironmentName.TRANSACTION_MANAGER,
this.txm );
}
}
private static String SPRING_TM_CLASSNAME = "org.springframework.transaction.support.AbstractPlatformTransactionManager";
public static boolean isSpringTransactionManager( Class clazz ) {
if ( SPRING_TM_CLASSNAME.equals(clazz.getName()) ) {
return true;
}
// Try to find from the ancestors
if (clazz.getSuperclass() != null)
{
return isSpringTransactionManager(clazz.getSuperclass());
}
return false;
}
public static class EndOperationListenerImpl
implements
EndOperationListener {
private TransactionManager txm;
private SessionInfo info;
public EndOperationListenerImpl(TransactionManager txm, SessionInfo info) {
this.info = info;
this.txm = txm;
}
public void endOperation(InternalKnowledgeRuntime kruntime) {
this.info.setLastModificationDate( new Date( kruntime.getLastIdleTimestamp() ) );
TransactionManagerHelper.addToUpdatableSet(txm, info);
}
}
public Context getContext() {
return this.kContext;
}
public CommandService getCommandService() {
return this.commandService;
}
public synchronized T execute(Command command) {
return commandService.execute(command);
}
private void rollbackTransaction(Exception t1, boolean transactionOwner) {
rollbackTransaction(t1, transactionOwner, true);
}
private void rollbackTransaction(Exception t1,
boolean transactionOwner, boolean logstack) {
try {
if (logstack) {
logger.warn( "Could not commit session", t1 );
} else {
logger.warn( "Could not commit session due to {}", t1.getMessage() );
}
txm.rollback( transactionOwner );
} catch ( Exception t2 ) {
logger.error( "Could not rollback",
t2 );
throw new RuntimeException( "Could not commit session or rollback",
t2 );
}
}
public void dispose() {
if ( ksession != null ) {
ksession.dispose();
}
this.interceptors.clear();
}
@Override
public void destroy() {
PersistenceContext persistenceContext = this.jpm.getApplicationScopedPersistenceContext();
boolean transactionOwner = false;
try {
transactionOwner = txm.begin();
persistenceContext.joinTransaction();
initExistingKnowledgeSession( this.sessionInfo.getId(),
this.marshallingHelper.getKbase(),
this.marshallingHelper.getConf(),
persistenceContext );
persistenceContext.remove(this.sessionInfo);
txm.commit( transactionOwner );
} catch ( RuntimeException re ) {
rollbackTransaction( re, transactionOwner );
throw re;
} catch ( Exception t1 ) {
rollbackTransaction(t1, transactionOwner);
throw new RuntimeException( "Wrapped exception see cause", t1 );
}
}
public Long getSessionId() {
return sessionInfo.getId();
}
private void registerRollbackSync() {
TransactionManagerHelper.registerTransactionSyncInContainer(this.txm, new SynchronizationImpl( this ));
}
private static class SynchronizationImpl
extends
OrderedTransactionSynchronization {
SingleSessionCommandService service;
public SynchronizationImpl(SingleSessionCommandService service) {
super(1, "SynchronizationImpl-"+service.toString());
this.service = service;
}
public void afterCompletion(int status) {
if ( status != TransactionManager.STATUS_COMMITTED ) {
this.service.rollback();
}
if (this.service.txm != null) {
ObjectMarshallingStrategy[] strategies = (ObjectMarshallingStrategy[]) this.service.env.get(EnvironmentName.OBJECT_MARSHALLING_STRATEGIES);
for (ObjectMarshallingStrategy strategy : strategies) {
if (strategy instanceof TransactionAware) {
((TransactionAware) strategy).onEnd(this.service.txm);
}
}
}
this.service.jpm.endCommandScopedEntityManager();
KieSession ksession = this.service.ksession;
// clean up cached process and work item instances
if ( ksession != null ) {
InternalProcessRuntime internalProcessRuntime = ((InternalWorkingMemory) ksession).internalGetProcessRuntime();
if ( internalProcessRuntime != null ) {
if (this.service.doRollback) {
internalProcessRuntime.clearProcessInstancesState();
}
internalProcessRuntime.clearProcessInstances();
}
((JPAWorkItemManager) ksession.getWorkItemManager()).clearWorkItems();
}
}
public void beforeCompletion() {
// not used
}
@Override
public String toString() {
return "SynchronizationImpl{" +
"service=" + service.sessionInfo + " cmd=" + service.toString() +
'}';
}
}
public KieSession getKieSession() {
return this.ksession;
}
public void addInterceptor(Interceptor interceptor) {
addInterceptor(interceptor, true);
}
protected void addInterceptor(Interceptor interceptor, boolean store) {
interceptor.setNext( this.commandService );
this.commandService = interceptor;
if (store) {
// put it on a stack so it can be recreated upon rollback
this.interceptors.push(interceptor);
}
}
private void rollback() {
this.doRollback = true;
}
private void registerUpdateSync() {
if (this.txm.getResource("TriggerUpdateTransactionSynchronization-"+this.toString()) == null) {
this.txm.registerTransactionSynchronization(new TriggerUpdateTransactionSynchronization(txm, env));
this.txm.putResource("TriggerUpdateTransactionSynchronization-"+this.toString(), true);
}
}
private class TransactionInterceptor extends AbstractInterceptor {
public TransactionInterceptor(Context context) {
setNext(new DefaultCommandService(context));
}
@Override
public T execute(Command command) {
if (command instanceof UnpersistableCommand) {
throw new UnsupportedOperationException("Command " + command + " cannot be issued on a persisted session");
}
if (command instanceof DisposeCommand) {
T result = executeNext( command );
jpm.dispose();
return result;
}
// Open the entity manager before the transaction begins.
PersistenceContext persistenceContext = jpm.getApplicationScopedPersistenceContext();
boolean transactionOwner = false;
try {
transactionOwner = txm.begin();
persistenceContext.joinTransaction();
initExistingKnowledgeSession( sessionInfo.getId(),
marshallingHelper.getKbase(),
marshallingHelper.getConf(),
persistenceContext );
jpm.beginCommandScopedEntityManager();
registerRollbackSync();
if (txm != null) {
ObjectMarshallingStrategy[] strategies = (ObjectMarshallingStrategy[]) env.get(EnvironmentName.OBJECT_MARSHALLING_STRATEGIES);
for (ObjectMarshallingStrategy strategy : strategies) {
if (strategy instanceof TransactionAware) {
((TransactionAware) strategy).onStart(txm);
}
}
}
T result = null;
if( command instanceof BatchExecutionCommand) {
// Batch execution requires the extra logic in
// StatefulSessionKnowledgeImpl.execute(Context,Command);
result = ksession.execute(command);
}
else {
logger.trace("Executing " + command.getClass().getSimpleName());
result = executeNext(command);
}
registerUpdateSync();
txm.commit( transactionOwner );
return result;
} catch ( RuntimeException re ) {
rollbackTransaction( re,
transactionOwner );
throw re;
} catch ( Exception t1 ) {
rollbackTransaction( t1,
transactionOwner );
throw new RuntimeException( "Wrapped exception see cause",
t1 );
}
}
}
}
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