ShutdownEventObserver.java

/*
 * Copyright 2009 JBoss, a divison Red Hat, Inc
 *
 * 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.jboss.errai.cdi.server.events;

import org.jboss.errai.bus.client.framework.MessageBus;
import org.jboss.errai.cdi.server.EventDispatcher;
import org.jboss.errai.cdi.server.TypeRegistry;
import org.jboss.errai.cdi.server.Util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.event.Reception;
import javax.enterprise.event.TransactionPhase;
import javax.enterprise.inject.spi.AnnotatedType;
import javax.enterprise.inject.spi.BeforeShutdown;
import javax.enterprise.inject.spi.ObserverMethod;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.HashSet;
import java.util.Set;

/**
 * Observes CDI {@link javax.enterprise.inject.spi.BeforeShutdown} events and unsubcribes
 * previously registered subjects with the {@link org.jboss.errai.bus.client.framework.MessageBus}
 *
 * @author: Heiko Braun <hbraun@redhat.com>
 * @date: Sep 15, 2010
 */
@ApplicationScoped
public class ShutdownEventObserver implements ObserverMethod {

    private static final Logger log = LoggerFactory.getLogger(ShutdownEventObserver.class);

    private TypeRegistry managedTypes;
    private MessageBus bus;
    private String uuid;

    public ShutdownEventObserver(TypeRegistry managedTypes, MessageBus bus, String uuid) {
        this.managedTypes = managedTypes;
        this.bus = bus;
        this.uuid = uuid;
    }

    public Class<?> getBeanClass()
    {
        return ShutdownEventObserver.class;
    }

    public Type getObservedType()
    {
        return BeforeShutdown.class;
    }

    public Set<Annotation> getObservedQualifiers()
    {
        Set<Annotation> qualifiers = new HashSet<Annotation>();
        return qualifiers;
    }

    public Reception getReception()
    {
        return Reception.ALWAYS;
    }

    public TransactionPhase getTransactionPhase()
    {
        return null;
    }

    public void notify(Object o)
    {
        log.info("Shutdown Errai-CDI context: " + uuid);
        
        // unsubscribe bean endpoints        
        for(AnnotatedType<?> svc : managedTypes.getServiceEndpoints())
        {
            String subject = Util.resolveServiceName(svc.getJavaClass());
            log.debug("Unsubscribe: "+subject);
            bus.unsubscribeAll(subject);
        }

        for(Class<?> rpcIntf : managedTypes.getRpcEndpoints().keySet())
        {
            String rpcSubjectName = rpcIntf.getName() + ":RPC";
            log.debug("Unsubscribe: "+rpcSubjectName);
            bus.unsubscribeAll(rpcSubjectName);
        }

        // unsubscribe event dispatcher endpoint
        bus.unsubscribeAll(EventDispatcher.NAME);
    }
}