/*
* JBoss, Home of Professional Open Source.
* Copyright 2010, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.ejb3.component.singleton;
import org.jboss.as.ee.component.AbstractComponentInstance;
import org.jboss.as.ee.component.Component;
import org.jboss.as.ee.component.ComponentInstance;
import org.jboss.as.ejb3.component.EJBBusinessMethod;
import org.jboss.as.ejb3.component.session.SessionBeanComponent;
import org.jboss.ejb3.concurrency.spi.LockableComponent;
import org.jboss.invocation.Interceptor;
import org.jboss.invocation.InterceptorContext;
import org.jboss.invocation.InterceptorFactoryContext;
import org.jboss.invocation.Interceptors;
import org.jboss.logging.Logger;
import javax.ejb.AccessTimeout;
import javax.ejb.LockType;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.concurrent.TimeUnit;
/**
* {@link Component} representing a {@link javax.ejb.Singleton} EJB.
*
* @author Jaikiran Pai
*/
public class SingletonComponent extends SessionBeanComponent implements LockableComponent {
private static final Logger logger = Logger.getLogger(SingletonComponent.class);
private SingletonComponentInstance singletonComponentInstance;
private boolean initOnStartup;
private LockType beanLevelLockType;
private Map<EJBBusinessMethod, LockType> methodLockTypes;
private Map<EJBBusinessMethod, AccessTimeout> methodAccessTimeouts;
/**
* Construct a new instance.
*
* @param configuration the component configuration
*/
public SingletonComponent(final SingletonComponentConfiguration configuration) {
super(configuration);
this.initOnStartup = configuration.isInitOnStartup();
this.beanLevelLockType = configuration.getBeanLevelLockType();
this.methodLockTypes = configuration.getMethodApplicableLockTypes();
this.methodAccessTimeouts = configuration.getMethodApplicableAccessTimeouts();
}
@Override
public synchronized ComponentInstance createInstance() {
if (this.singletonComponentInstance != null) {
throw new IllegalStateException("A singleton component instance has already been created for bean: " + this.getComponentName());
}
return super.createInstance();
}
@Override
protected synchronized AbstractComponentInstance constructComponentInstance(Object instance, InterceptorFactoryContext context) {
if (this.singletonComponentInstance != null) {
throw new IllegalStateException("A singleton component instance has already been created for bean: " + this.getComponentName());
}
this.singletonComponentInstance = new SingletonComponentInstance(this, instance, context);
return this.singletonComponentInstance;
}
synchronized ComponentInstance getComponentInstance() {
if (this.singletonComponentInstance == null) {
this.singletonComponentInstance = (SingletonComponentInstance) this.createInstance();
}
return this.singletonComponentInstance;
}
@Override
public void start() {
super.start();
if (this.initOnStartup) {
// Do not call createInstance() because we can't ever assume that the singleton instance
// hasn't already been created.
logger.debug(this.getComponentName() + " bean is a @Startup (a.k.a init-on-startup) bean, creating/getting the singleton instance");
this.getComponentInstance();
}
}
@Override
public void stop() {
this.destroySingletonInstance();
super.stop();
}
@Override
public LockType getLockType(Method method) {
EJBBusinessMethod beanMethod = new EJBBusinessMethod(method.getName(), method.getParameterTypes());
LockType lockType = this.methodLockTypes.get(beanMethod);
if (lockType != null) {
return lockType;
}
// check bean level lock type
if (this.beanLevelLockType != null) {
return this.beanLevelLockType;
}
// default WRITE lock type
return LockType.WRITE;
}
@Override
public AccessTimeout getAccessTimeout(Method method) {
EJBBusinessMethod beanMethod = new EJBBusinessMethod(method.getName(), method.getParameterTypes());
AccessTimeout accessTimeout = this.methodAccessTimeouts.get(beanMethod);
if (accessTimeout != null) {
return accessTimeout;
}
// check bean level access timeout
if (this.beanLevelAccessTimeout != null) {
return this.beanLevelAccessTimeout;
}
return null;
}
@Override
public AccessTimeout getDefaultAccessTimeout() {
// TODO: This has to be configurable.
// Currently defaults to 5 minutes
return new AccessTimeout() {
@Override
public long value() {
return 5;
}
@Override
public TimeUnit unit() {
return TimeUnit.MINUTES;
}
@Override
public Class<? extends Annotation> annotationType() {
return AccessTimeout.class;
}
};
}
private synchronized void destroySingletonInstance() {
if (this.singletonComponentInstance != null) {
this.destroyInstance(this.singletonComponentInstance);
this.singletonComponentInstance = null;
}
}
@Override
public Object invoke(Serializable sessionId, Map<String, Object> contextData, Class<?> invokedBusinessInterface, Method beanMethod, Object[] args) throws Exception {
if (sessionId != null)
throw new IllegalArgumentException("Singleton " + this + " does not support sessions");
if (invokedBusinessInterface != null)
throw new UnsupportedOperationException("invokedBusinessInterface != null");
InterceptorContext context = new InterceptorContext();
context.putPrivateData(Component.class, this);
context.setContextData(contextData);
context.setMethod(beanMethod);
context.setParameters(args);
return getComponentInterceptor().processInvocation(context);
}
}