/*
 * Copyright (c) 2013, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.jersey.server.internal.monitoring;

import javax.inject.Singleton;

import org.glassfish.jersey.internal.inject.AbstractBinder;
import org.glassfish.jersey.server.monitoring.ApplicationEvent;
import org.glassfish.jersey.server.monitoring.ApplicationEventListener;
import org.glassfish.jersey.server.spi.Container;
import org.glassfish.jersey.server.spi.ContainerLifecycleListener;

Container listener that listens to container events and trigger the application events and call them on supplied RequestEventListener. 

This listener must be registered as a standard provider in Jersey runtime.
Author:
Miroslav Fuksa/**
 * Container listener that listens to container events and trigger the {@link ApplicationEvent application events}
 * and call them on supplied {@link org.glassfish.jersey.server.monitoring.RequestEventListener}.
 * <p/>
 * This listener must be registered as a standard provider in Jersey runtime.
 *
 * @author Miroslav Fuksa
 */
public final class MonitoringContainerListener implements ContainerLifecycleListener {

    private volatile ApplicationEvent initFinishedEvent;
    private volatile ApplicationEventListener listener;

    
Initializes the instance with listener that must be called and initialization event. If this method is not called then events cannot not be triggered which might be needed when no ApplicationEventListener is registered in Jersey runtime. 
Params:
listener – Listener that should be called.
initFinishedEvent – Event of type Type.INITIALIZATION_START./**
     * Initializes the instance with listener that must be called and initialization event. If this method
     * is not called then events cannot not be triggered which might be needed when no
     * {@link ApplicationEventListener} is registered in Jersey runtime.
     *
     * @param listener Listener that should be called.
     * @param initFinishedEvent Event of type {@link ApplicationEvent.Type#INITIALIZATION_START}.
     */
    public void init(ApplicationEventListener listener, ApplicationEvent initFinishedEvent) {
        this.listener = listener;
        this.initFinishedEvent = initFinishedEvent;
    }

    @Override
    public void onStartup(Container container) {
        if (listener != null) {
            listener.onEvent(getApplicationEvent(ApplicationEvent.Type.INITIALIZATION_FINISHED));
        }
    }

    @Override
    public void onReload(Container container) {
        if (listener != null) {
            listener.onEvent(getApplicationEvent(ApplicationEvent.Type.RELOAD_FINISHED));
        }
    }

    private ApplicationEvent getApplicationEvent(ApplicationEvent.Type type) {
        return new ApplicationEventImpl(type,
                initFinishedEvent.getResourceConfig(), initFinishedEvent.getProviders(),
                initFinishedEvent.getRegisteredClasses(), initFinishedEvent.getRegisteredInstances(),
                initFinishedEvent.getResourceModel());
    }

    @Override
    public void onShutdown(Container container) {
        if (listener != null) {
            listener.onEvent(getApplicationEvent(ApplicationEvent.Type.DESTROY_FINISHED));
        }
    }

    
A binder that binds the MonitoringContainerListener. /**
     * A binder that binds the {@link MonitoringContainerListener}.
     */
    public static class Binder extends AbstractBinder {
        @Override
        protected void configure() {
            bindAsContract(MonitoringContainerListener.class)
                    .to(ContainerLifecycleListener.class).in(Singleton.class);
        }
    }
}