/jboss-as-7.1.1.Final/ejb3/src/main/java/org/jboss/as/ejb3/component/entity/interceptors/EntityBeanEjbCreateMethodInterceptorFactory.java

  1/*
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  3 * Copyright 2010, Red Hat Inc., and individual contributors as indicated
  4 * by the @authors tag. See the copyright.txt in the distribution for a
  5 * full listing of individual contributors.
  6 *
  7 * This is free software; you can redistribute it and/or modify it
  8 * under the terms of the GNU Lesser General Public License as
  9 * published by the Free Software Foundation; either version 2.1 of
 10 * the License, or (at your option) any later version.
 11 *
 12 * This software is distributed in the hope that it will be useful,
 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 15 * Lesser General Public License for more details.
 16 *
 17 * You should have received a copy of the GNU Lesser General Public
 18 * License along with this software; if not, write to the Free
 19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 21 */
 22package org.jboss.as.ejb3.component.entity.interceptors;
 23
 24import java.lang.reflect.InvocationTargetException;
 25import java.lang.reflect.Method;
 26import java.util.concurrent.atomic.AtomicReference;
 27
 28import javax.transaction.Status;
 29import javax.transaction.Synchronization;
 30import javax.transaction.TransactionSynchronizationRegistry;
 31
 32import org.jboss.as.ee.component.Component;
 33import org.jboss.as.ee.component.interceptors.InvocationType;
 34import org.jboss.as.ejb3.component.entity.EntityBeanComponent;
 35import org.jboss.as.ejb3.component.entity.EntityBeanComponentInstance;
 36import org.jboss.invocation.Interceptor;
 37import org.jboss.invocation.InterceptorContext;
 38import org.jboss.invocation.InterceptorFactory;
 39import org.jboss.invocation.InterceptorFactoryContext;
 40import org.jboss.invocation.Interceptors;
 41
 42import static org.jboss.as.ejb3.EjbMessages.MESSAGES;
 43
 44/**
 45 * Interceptor factory for entity beans that class the corresponding ejbCreate method.
 46 * <p/>
 47 * This is a post construct interceptor for the Ejb(Local)Object view
 48 *
 49 * @author Stuart Douglas
 50 */
 51public class EntityBeanEjbCreateMethodInterceptorFactory implements InterceptorFactory {
 52
 53    public static final EntityBeanEjbCreateMethodInterceptorFactory INSTANCE = new EntityBeanEjbCreateMethodInterceptorFactory();
 54
 55    protected EntityBeanEjbCreateMethodInterceptorFactory() {
 56    }
 57
 58    @Override
 59    public Interceptor create(InterceptorFactoryContext context) {
 60        final Object existing = context.getContextData().get(EntityBeanComponent.PRIMARY_KEY_CONTEXT_KEY);
 61
 62        final AtomicReference<Object> primaryKeyReference = new AtomicReference<Object>();
 63        context.getContextData().put(EntityBeanComponent.PRIMARY_KEY_CONTEXT_KEY, primaryKeyReference);
 64
 65        final Method ejbCreate = (Method) context.getContextData().get(EntityBeanHomeCreateInterceptorFactory.EJB_CREATE_METHOD_KEY);
 66        final Method ejbPostCreate = (Method) context.getContextData().get(EntityBeanHomeCreateInterceptorFactory.EJB_POST_CREATE_METHOD_KEY);
 67        final Object[] params = (Object[]) context.getContextData().get(EntityBeanHomeCreateInterceptorFactory.PARAMETERS_KEY);
 68
 69        return new Interceptor() {
 70            @Override
 71            public Object processInvocation(final InterceptorContext context) throws Exception {
 72
 73                if (existing != null) {
 74                    primaryKeyReference.set(existing);
 75                    return existing;
 76                }
 77                final Component component = context.getPrivateData(Component.class);
 78                if (!(component instanceof EntityBeanComponent)) {
 79                    throw MESSAGES.unexpectedComponent(component, EntityBeanComponent.class);
 80                }
 81                final EntityBeanComponent entityBeanComponent = (EntityBeanComponent) component;
 82                //grab an unasociated entity bean from the pool
 83                final EntityBeanComponentInstance instance = entityBeanComponent.acquireUnAssociatedInstance();
 84
 85                //call the ejbCreate method
 86                final Object primaryKey = invokeEjbCreate(context, ejbCreate, instance, params);
 87                instance.associate(primaryKey);
 88                primaryKeyReference.set(primaryKey);
 89
 90                //now add the instance to the cache, so it is usable
 91                //note that we do not release it back to the pool
 92                //the cache will do that when it is expired or removed
 93
 94                boolean synchronizationRegistered = false;
 95                boolean exception = false;
 96                entityBeanComponent.getCache().create(instance);
 97
 98                try {
 99
100                    invokeEjbPostCreate(context, ejbPostCreate, instance, params);
101
102                    //if a transaction is active we register a sync
103                    //and if the transaction is rolled back we release the instance back into the pool
104
105                    final TransactionSynchronizationRegistry transactionSynchronizationRegistry = entityBeanComponent.getTransactionSynchronizationRegistry();
106                    if (transactionSynchronizationRegistry.getTransactionKey() != null) {
107                        transactionSynchronizationRegistry.registerInterposedSynchronization(new Synchronization() {
108                            @Override
109                            public void beforeCompletion() {
110
111                            }
112
113                            @Override
114                            public void afterCompletion(final int status) {
115                                entityBeanComponent.getCache().release(instance, status == Status.STATUS_COMMITTED);
116                            }
117                        });
118                        synchronizationRegistered = true;
119                    }
120                    return context.proceed();
121                } catch (Exception e) {
122                    entityBeanComponent.getCache().release(instance, false);
123                    exception = true;
124                    throw e;
125                } finally {
126                    if (!synchronizationRegistered && !exception) {
127                        entityBeanComponent.getCache().release(instance, true);
128                    }
129                }
130            }
131
132
133        };
134
135    }
136
137    protected void invokeEjbPostCreate(final InterceptorContext context, final Method ejbPostCreate, final EntityBeanComponentInstance instance, final Object[] params) throws Exception {
138        try {
139            ejbPostCreate.invoke(instance.getInstance(), params);
140        } catch (InvocationTargetException e) {
141            throw Interceptors.rethrow(e.getCause());
142        }
143    }
144
145    protected Object invokeEjbCreate(final InterceptorContext context, final Method ejbCreate, final EntityBeanComponentInstance instance, final Object[] params) throws Exception {
146        final InvocationType invocationType = context.getPrivateData(InvocationType.class);
147        try {
148            context.putPrivateData(InvocationType.class, InvocationType.ENTITY_EJB_CREATE);
149            return ejbCreate.invoke(instance.getInstance(), params);
150        } catch (InvocationTargetException e) {
151            throw Interceptors.rethrow(e.getCause());
152        } finally {
153            context.putPrivateData(InvocationType.class, invocationType);
154        }
155    }
156}