| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.meecrowave.jpa.internal; |
| |
| import org.apache.meecrowave.jpa.api.EntityManagerScoped; |
| |
| import javax.enterprise.context.spi.AlterableContext; |
| import javax.enterprise.context.spi.Contextual; |
| import javax.enterprise.context.spi.CreationalContext; |
| import java.io.Serializable; |
| import java.lang.annotation.Annotation; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import static java.util.Optional.ofNullable; |
| |
| public class EntityManagerContext implements AlterableContext { |
| private final ThreadLocal<ThreadContext> context = new ThreadLocal<>(); |
| |
| public boolean enter(final boolean transactional) { |
| if (context.get() != null) { |
| return false; |
| } |
| final ThreadContext value = new ThreadContext(); |
| value.transactional = transactional; |
| context.set(value); |
| return true; |
| } |
| |
| public void failed() { |
| context.get().failed = true; |
| } |
| |
| public void exit(final boolean created) { |
| if (created) { |
| try { |
| context.get().exit(); |
| } finally { |
| context.remove(); |
| } |
| } |
| } |
| |
| @Override |
| public Class<? extends Annotation> getScope() { |
| return EntityManagerScoped.class; |
| } |
| |
| @Override |
| public void destroy(final Contextual<?> contextual) { |
| context.get().destroy(contextual); |
| } |
| |
| @Override |
| public <T> T get(final Contextual<T> component, final CreationalContext<T> creationalContext) { |
| return context.get().get(component, creationalContext); |
| } |
| |
| @Override |
| public <T> T get(final Contextual<T> component) { |
| return context.get().get(component); |
| } |
| |
| @Override |
| public boolean isActive() { |
| final boolean active = context.get() != null; |
| if (!active) { |
| context.remove(); |
| } |
| return active; |
| } |
| |
| public boolean hasFailed() { |
| return context.get().failed; |
| } |
| |
| public boolean isTransactional() { |
| return context.get().transactional; |
| } |
| |
| private static class ThreadContext implements AlterableContext { |
| private final Map<Contextual<?>, BeanInstanceBag<?>> components = new HashMap<>(); |
| private boolean failed; |
| private boolean transactional; |
| |
| @Override |
| public Class<? extends Annotation> getScope() { |
| return EntityManagerScoped.class; |
| } |
| |
| @Override |
| public <T> T get(final Contextual<T> component, final CreationalContext<T> creationalContext) { |
| BeanInstanceBag<T> bag = (BeanInstanceBag<T>) components.get(component); |
| if (bag == null) { |
| bag = new BeanInstanceBag<>(creationalContext); |
| components.put(component, bag); |
| } |
| if (bag.beanInstance == null) { |
| bag.beanInstance = component.create(creationalContext); |
| } |
| return bag.beanInstance; |
| } |
| |
| @Override |
| public <T> T get(final Contextual<T> component) { |
| final BeanInstanceBag<?> bag = components.get(component); |
| return bag == null ? null : (T) bag.beanInstance; |
| } |
| |
| @Override |
| public void destroy(final Contextual<?> contextual) { |
| final BeanInstanceBag remove = components.remove(contextual); |
| ofNullable(remove).ifPresent(b -> doDestroy(contextual, b)); |
| } |
| |
| private <T> void doDestroy(final Contextual<T> contextual, final BeanInstanceBag<T> bag) { |
| if ( bag.beanInstance !=null ) { |
| // check null here because in case of missconfiguration, this can raise an NPE and hide the original exception |
| contextual.destroy(bag.beanInstance, bag.beanCreationalContext); |
| } |
| bag.beanCreationalContext.release(); |
| } |
| |
| @Override |
| public boolean isActive() { |
| return true; |
| } |
| |
| private void exit() { |
| components.forEach((k, bag) -> doDestroy(k, BeanInstanceBag.class.cast(bag))); |
| } |
| } |
| |
| private static class BeanInstanceBag<T> implements Serializable { |
| private final CreationalContext<T> beanCreationalContext; |
| private T beanInstance; |
| |
| private BeanInstanceBag(final CreationalContext<T> beanCreationalContext) { |
| this.beanCreationalContext = beanCreationalContext; |
| } |
| } |
| } |