1 /*

     2  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.  Oracle designates this

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

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

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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

    15  * accompanied this code).

    16  *

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

    18  * 2 along with this work; if not, write to the Free Software Foundation,

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

    20  *

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

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

    23  * questions.

    24  */

    25 

    26 package sun.nio.ch;

    27 

    28 import java.nio.channels.*;

    29 import java.nio.channels.spi.AsynchronousChannelProvider;

    30 import java.util.concurrent.ExecutorService;

    31 import java.util.concurrent.ThreadFactory;

    32 import java.io.IOException;

    33 

    34 public class LinuxAsynchronousChannelProvider

    35     extends AsynchronousChannelProvider

    36 {

    37     private static volatile EPollPort defaultPort;

    38 

    39     private EPollPort defaultEventPort() throws IOException {

    40         if (defaultPort == null) {

    41             synchronized (LinuxAsynchronousChannelProvider.class) {

    42                 if (defaultPort == null) {

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

    44                 }

    45             }

    46         }

    47         return defaultPort;

    48     }

    49 

    50     public LinuxAsynchronousChannelProvider() {

    51     }

    52 

    53     @Override

    54     public AsynchronousChannelGroup openAsynchronousChannelGroup(int nThreads, ThreadFactory factory)

    55         throws IOException

    56     {

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

    58     }

    59 

    60     @Override

    61     public AsynchronousChannelGroup openAsynchronousChannelGroup(ExecutorService executor, int initialSize)

    62         throws IOException

    63     {

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

    65     }

    66 

    67     private Port toPort(AsynchronousChannelGroup group) throws IOException {

    68         if (group == null) {

    69             return defaultEventPort();

    70         } else {

    71             if (!(group instanceof EPollPort))

    72                 throw new IllegalChannelGroupException();

    73             return (Port)group;

    74         }

    75     }

    76 

    77     @Override

    78     public AsynchronousServerSocketChannel openAsynchronousServerSocketChannel(AsynchronousChannelGroup group)

    79         throws IOException

    80     {

    81         return new UnixAsynchronousServerSocketChannelImpl(toPort(group));

    82     }

    83 

    84     @Override

    85     public AsynchronousSocketChannel openAsynchronousSocketChannel(AsynchronousChannelGroup group)

    86         throws IOException

    87     {

    88         return new UnixAsynchronousSocketChannelImpl(toPort(group));

    89     }

    90 }