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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2014-2015 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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package org.glassfish.jersey.server.internal.process;

import java.io.Closeable;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.glassfish.jersey.server.CloseableService;
import org.glassfish.jersey.server.internal.LocalizationMessages;

import jersey.repackaged.com.google.common.collect.Sets;

/**
 * Default implementation of {@link CloseableService}.
 *
 * This implementation stores instances of {@code Closeable} in an internal identity hash set and makes sure
 * that the close method is invoked at most once.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
class DefaultCloseableService implements CloseableService {

    private static final Logger LOGGER = Logger.getLogger(DefaultCloseableService.class.getName());

    private final AtomicBoolean closed = new AtomicBoolean(false);
    private final Set closeables = Sets.newIdentityHashSet();

    @Override
    public boolean add(final Closeable closeable) {
        return !closed.get() && closeables.add(closeable);
    }

    @Override
    public void close() {
        if (closed.compareAndSet(false, true)) {
            for (final Closeable closeable : closeables) {
                try {
                    closeable.close();
                } catch (Exception ex) {
                    LOGGER.log(Level.WARNING,
                            LocalizationMessages.CLOSEABLE_UNABLE_TO_CLOSE(closeable.getClass().getName()), ex);
                }
            }
        }
    }
}