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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 
defaultEventPort()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 
LinuxAsynchronousChannelProvider()50     public LinuxAsynchronousChannelProvider() {
51     }
52 
53     @Override
openAsynchronousChannelGroup(int nThreads, ThreadFactory factory)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
openAsynchronousChannelGroup(ExecutorService executor, int initialSize)61     public AsynchronousChannelGroup openAsynchronousChannelGroup(ExecutorService executor, int initialSize)
62         throws IOException
63     {
64         return new EPollPort(this, ThreadPool.wrap(executor, initialSize)).start();
65     }
66 
toPort(AsynchronousChannelGroup group)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
openAsynchronousServerSocketChannel(AsynchronousChannelGroup group)78     public AsynchronousServerSocketChannel openAsynchronousServerSocketChannel(AsynchronousChannelGroup group)
79         throws IOException
80     {
81         return new UnixAsynchronousServerSocketChannelImpl(toPort(group));
82     }
83 
84     @Override
openAsynchronousSocketChannel(AsynchronousChannelGroup group)85     public AsynchronousSocketChannel openAsynchronousSocketChannel(AsynchronousChannelGroup group)
86         throws IOException
87     {
88         return new UnixAsynchronousSocketChannelImpl(toPort(group));
89     }
90 }
91