/*

 * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.

 * Copyright 2012 SAP AG. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

package sun.nio.ch;

import java.nio.channels.*;

import java.nio.channels.spi.AsynchronousChannelProvider;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.ThreadFactory;

import java.io.IOException;

public class AixAsynchronousChannelProvider

    extends AsynchronousChannelProvider

{

    private static volatile AixPollPort defaultPort;

    private AixPollPort defaultEventPort() throws IOException {

        if (defaultPort == null) {

            synchronized (AixAsynchronousChannelProvider.class) {

                if (defaultPort == null) {

                    defaultPort = new AixPollPort(this, ThreadPool.getDefault()).start();

                }

            }

        }

        return defaultPort;

    }

    public AixAsynchronousChannelProvider() {

    }

    @Override

    public AsynchronousChannelGroup openAsynchronousChannelGroup(int nThreads, ThreadFactory factory)

        throws IOException

    {

        return new AixPollPort(this, ThreadPool.create(nThreads, factory)).start();

    }

    @Override

    public AsynchronousChannelGroup openAsynchronousChannelGroup(ExecutorService executor, int initialSize)

        throws IOException

    {

        return new AixPollPort(this, ThreadPool.wrap(executor, initialSize)).start();

    }

    private Port toPort(AsynchronousChannelGroup group) throws IOException {

        if (group == null) {

            return defaultEventPort();

        } else {

            if (!(group instanceof AixPollPort))

                throw new IllegalChannelGroupException();

            return (Port)group;

        }

    }

    @Override

    public AsynchronousServerSocketChannel openAsynchronousServerSocketChannel(AsynchronousChannelGroup group)

        throws IOException

    {

        return new UnixAsynchronousServerSocketChannelImpl(toPort(group));

    }

    @Override

    public AsynchronousSocketChannel openAsynchronousSocketChannel(AsynchronousChannelGroup group)

        throws IOException

    {

        return new UnixAsynchronousSocketChannelImpl(toPort(group));

    }

}