/*
 * Copyright (c) 2015, 2019 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.model.internal;

import java.util.HashSet;
import java.util.Set;

import javax.annotation.PreDestroy;
import javax.inject.Singleton;

import org.glassfish.jersey.internal.inject.InjectionManager;

Invokes PreDestroy methods on all registered objects, when the injection manager is shut down. 
 Some objects managed by Jersey are created using InjectionManager.createAndInitialize. This means that such objects are created, dependencies injected and methods annotated with PostConstruct invoked. Therefore methods annotated with PreDestroy should be invoked on such objects too, when they are destroyed. 
 This service invokes PreDestroy on all registered objects when InjectionManager.shutdown() is invoked on the injection manager where this service is registered. Therefore only classes with their lifecycle linked to the injection manager that created them should be registered here. 
Author:
Petr Janouch/**
 * Invokes {@link PreDestroy} methods on all registered objects, when the injection manager is shut down.
 * <p/>
 * Some objects managed by Jersey are created using {@link InjectionManager#createAndInitialize}. This means
 * that such objects are created, dependencies injected and methods annotated with {@link javax.annotation.PostConstruct}
 * invoked. Therefore methods annotated with {@link PreDestroy} should be invoked on such objects too, when they are destroyed.
 * <p/>
 * This service invokes {@link PreDestroy} on all registered objects when {@link InjectionManager#shutdown()} is invoked
 * on the injection manager where this service is registered. Therefore only classes with their lifecycle linked
 * to the injection manager that created them should be registered here.
 *
 * @author Petr Janouch
 */
@Singleton
public class ManagedObjectsFinalizer {

    private final InjectionManager injectionManager;

    private final Set<Object> managedObjects = new HashSet<>();

    
Creates a new instance of ManagedObjectsFinalizer. 
Params:
injectionManager – injection manager call preDestroy on managed objects./**
     * Creates a new instance of {@link ManagedObjectsFinalizer}.
     *
     * @param injectionManager injection manager call {@code preDestroy} on managed objects.
     */
    public ManagedObjectsFinalizer(final InjectionManager injectionManager) {
        this.injectionManager = injectionManager;
    }

    
Register an object for invocation of its PreDestroy method. It will be invoked when the injection manager is shut down. 
Params:
object – an object to be registered./**
     * Register an object for invocation of its {@link PreDestroy} method.
     * It will be invoked when the injection manager is shut down.
     *
     * @param object an object to be registered.
     */
    public void registerForPreDestroyCall(Object object) {
        managedObjects.add(object);
    }

    @PreDestroy
    public void preDestroy() {
        try {
            for (Object o : managedObjects) {
                injectionManager.preDestroy(o);
            }

        } finally {
            managedObjects.clear();
        }
    }
}