/*
* Copyright 2013 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.jbpm.runtime.manager.impl.mapper;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.NoResultException;
import javax.persistence.NonUniqueResultException;
import javax.persistence.Query;
import org.jbpm.runtime.manager.impl.jpa.ContextMappingInfo;
import org.kie.api.runtime.Environment;
import org.kie.api.runtime.EnvironmentName;
import org.kie.api.runtime.manager.Context;
import org.kie.internal.process.CorrelationKey;
import org.kie.internal.process.CorrelationProperty;
import org.kie.internal.runtime.manager.context.CorrelationKeyContext;
import org.kie.internal.runtime.manager.context.ProcessInstanceIdContext;
/**
* Database based mapper implementation backed by JPA to store
* the context to <code>KieSession</code> id mapping. It uses the <code>ContextMappingInfo</code>
* entity for persistence.
*
* @see ContextMappingInfo
*
*/
@SuppressWarnings("rawtypes")
public class JPAMapper extends InternalMapper {
private EntityManagerFactory emf;
public JPAMapper(EntityManagerFactory emf) {
this.emf = emf;
}
@Override
public void saveMapping(Context context, Long ksessionId, String ownerId) {
EntityManagerInfo info = getEntityManager(context);
EntityManager em = info.getEntityManager();
em.persist(new ContextMappingInfo(resolveContext(context, em).getContextId().toString(),
ksessionId, ownerId));
if (!info.isShared()) {
em.close();
}
}
@Override
public Long findMapping(Context context, String ownerId) {
EntityManagerInfo info = getEntityManager(context);
EntityManager em = info.getEntityManager();
try {
ContextMappingInfo contextMapping = findContextByContextId(resolveContext(context, em), ownerId, em);
if (contextMapping != null) {
return contextMapping.getKsessionId();
}
return null;
} finally {
if (!info.isShared()) {
em.close();
}
}
}
@Override
public void removeMapping(Context context, String ownerId) {
EntityManagerInfo info = getEntityManager(context);
EntityManager em = info.getEntityManager();
ContextMappingInfo contextMapping = findContextByContextId(resolveContext(context, em), ownerId, em);
if (contextMapping != null) {
em.remove(contextMapping);
}
if (!info.isShared()) {
em.close();
}
}
protected Context resolveContext(Context orig, EntityManager em) {
if (orig instanceof CorrelationKeyContext) {
return getProcessInstanceByCorrelationKey((CorrelationKey)orig.getContextId(), em);
}
return orig;
}
protected ContextMappingInfo findContextByContextId(Context context, String ownerId, EntityManager em) {
try {
if (context.getContextId() == null) {
return null;
}
Query findQuery = em.createNamedQuery("FindContextMapingByContextId")
.setParameter("contextId", context.getContextId().toString())
.setParameter("ownerId", ownerId);
ContextMappingInfo contextMapping = (ContextMappingInfo) findQuery.getSingleResult();
return contextMapping;
} catch (NoResultException e) {
return null;
} catch (NonUniqueResultException e) {
return null;
}
}
public Context getProcessInstanceByCorrelationKey(CorrelationKey correlationKey, EntityManager em) {
Query processInstancesForEvent = em.createNamedQuery( "GetProcessInstanceIdByCorrelation" );
processInstancesForEvent.setParameter( "ckey", correlationKey.toExternalForm());
try {
return ProcessInstanceIdContext.get((Long) processInstancesForEvent.getSingleResult());
} catch (NonUniqueResultException e) {
return null;
} catch (NoResultException e) {
return null;
}
}
@Override
public Object findContextId(Long ksessionId, String ownerId) {
EntityManagerInfo info = getEntityManager(null);
EntityManager em = info.getEntityManager();
try {
Query findQuery = em.createNamedQuery("FindContextMapingByKSessionId")
.setParameter("ksessionId", ksessionId)
.setParameter("ownerId", ownerId);
@SuppressWarnings("unchecked")
List<ContextMappingInfo> contextMapping = findQuery.getResultList();
if (contextMapping.isEmpty()) {
return null;
} else if (contextMapping.size() == 1) {
return contextMapping.get(0).getContextId();
} else {
return contextMapping.stream().map(cmi -> cmi.getContextId()).collect(Collectors.toList());
}
} catch (NoResultException e) {
return null;
} catch (NonUniqueResultException e) {
return null;
} finally {
if (!info.isShared()) {
em.close();
}
}
}
private EntityManagerInfo getEntityManager(Context context) {
Environment env = null;
if (context instanceof EnvironmentAwareProcessInstanceContext){
env = ((EnvironmentAwareProcessInstanceContext) context).getEnvironment();
}
if (env != null) {
EntityManager em = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
if (em != null) {
return new EntityManagerInfo(em, true);
}
EntityManagerFactory emf = (EntityManagerFactory) env.get(EnvironmentName.ENTITY_MANAGER_FACTORY);
if (emf != null) {
return new EntityManagerInfo(emf.createEntityManager(), false);
}
} else {
return new EntityManagerInfo(emf.createEntityManager(), false);
}
throw new RuntimeException("Could not find EntityManager, both command-scoped EM and EMF in environment are null");
}
private class EntityManagerInfo {
private EntityManager entityManager;
private boolean shared;
public EntityManagerInfo(EntityManager entityManager, boolean shared) {
this.entityManager = entityManager;
this.shared = shared;
}
public EntityManager getEntityManager() {
return entityManager;
}
public boolean isShared() {
return shared;
}
}
@SuppressWarnings("unchecked")
public List<Long> findKSessionToInit(String ownerId) {
EntityManager em = emf.createEntityManager();
Query findQuery = em.createNamedQuery("FindKSessionToInit").setParameter("ownerId", ownerId);
return findQuery.getResultList();
}
@SuppressWarnings("unchecked")
public List<String> findContextIdForEvent(String eventType, String ownerId) {
EntityManager em = emf.createEntityManager();
Query findQuery = em.createNamedQuery("FindProcessInstanceWaitingForEvent")
.setParameter("eventType", eventType).setParameter("ownerId", ownerId);
return findQuery.getResultList();
}
}