1/*
2 * Copyright (c) 2012, 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
26package sun.nio.ch;
27
28import java.nio.channels.*;
29import java.nio.channels.spi.AsynchronousChannelProvider;
30import java.util.concurrent.ExecutorService;
31import java.util.concurrent.ThreadFactory;
32import java.io.IOException;
33
34public class BsdAsynchronousChannelProvider
35    extends AsynchronousChannelProvider
36{
37    private static volatile KQueuePort defaultPort;
38
39    private KQueuePort defaultEventPort() throws IOException {
40        if (defaultPort == null) {
41            synchronized (BsdAsynchronousChannelProvider.class) {
42                if (defaultPort == null) {
43                    defaultPort = new KQueuePort(this, ThreadPool.getDefault()).start();
44                }
45            }
46        }
47        return defaultPort;
48    }
49
50    public BsdAsynchronousChannelProvider() {
51    }
52
53    @Override
54    public AsynchronousChannelGroup openAsynchronousChannelGroup(int nThreads, ThreadFactory factory)
55        throws IOException
56    {
57        return new KQueuePort(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 KQueuePort(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 KQueuePort))
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}
91