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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 WindowsAsynchronousChannelProvider
35     extends AsynchronousChannelProvider
36 {
37     private static volatile Iocp defaultIocp;
38 
WindowsAsynchronousChannelProvider()39     public WindowsAsynchronousChannelProvider() {
40         // nothing to do
41     }
42 
defaultIocp()43     private Iocp defaultIocp() throws IOException {
44         if (defaultIocp == null) {
45             synchronized (WindowsAsynchronousChannelProvider.class) {
46                 if (defaultIocp == null) {
47                     // default thread pool may be shared with AsynchronousFileChannels
48                     defaultIocp = new Iocp(this, ThreadPool.getDefault()).start();
49                 }
50             }
51         }
52         return defaultIocp;
53     }
54 
55     @Override
openAsynchronousChannelGroup(int nThreads, ThreadFactory factory)56     public AsynchronousChannelGroup openAsynchronousChannelGroup(int nThreads, ThreadFactory factory)
57         throws IOException
58     {
59         return new Iocp(this, ThreadPool.create(nThreads, factory)).start();
60     }
61 
62     @Override
openAsynchronousChannelGroup(ExecutorService executor, int initialSize)63     public AsynchronousChannelGroup openAsynchronousChannelGroup(ExecutorService executor, int initialSize)
64         throws IOException
65     {
66         return new Iocp(this, ThreadPool.wrap(executor, initialSize)).start();
67     }
68 
toIocp(AsynchronousChannelGroup group)69     private Iocp toIocp(AsynchronousChannelGroup group) throws IOException {
70         if (group == null) {
71             return defaultIocp();
72         } else {
73             if (!(group instanceof Iocp))
74                 throw new IllegalChannelGroupException();
75             return (Iocp)group;
76         }
77     }
78 
79     @Override
openAsynchronousServerSocketChannel(AsynchronousChannelGroup group)80     public AsynchronousServerSocketChannel openAsynchronousServerSocketChannel(AsynchronousChannelGroup group)
81         throws IOException
82     {
83         return new WindowsAsynchronousServerSocketChannelImpl(toIocp(group));
84     }
85 
86     @Override
openAsynchronousSocketChannel(AsynchronousChannelGroup group)87     public AsynchronousSocketChannel openAsynchronousSocketChannel(AsynchronousChannelGroup group)
88         throws IOException
89     {
90         return new WindowsAsynchronousSocketChannelImpl(toIocp(group));
91     }
92 }
93