Examples of java.nio.channels.Channel

java.nio.channels.Channel
A channel is a conduit to IO services covering such items as files, sockets, hardware devices, IO ports, or some software component.
Channels are open upon creation, and can be explicitly closed. Once a channel is closed it cannot be re-opened, and attempts to perform IO operations on the closed channel result in a ClosedChannelException .

Particular implementations or sub-interfaces of Channel dictate whther they are thread-safe or not.

                         (socketChannel instanceof SocketChannel) ? asSocket().getOOBInline() : false
                         );
    }


    private IRubyObject getRcvBuf(Ruby runtime) throws IOException {
        Channel socketChannel = openFile.getMainStream().getDescriptor().getChannel();
        return number(runtime,
                      (socketChannel instanceof SocketChannel) ? asSocket().getReceiveBufferSize() : 
                      ((socketChannel instanceof ServerSocketChannel) ? asServerSocket().getReceiveBufferSize() : 
                       asDatagramSocket().getReceiveBufferSize())
                      );

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                       asDatagramSocket().getReceiveBufferSize())
                      );
    }


    private IRubyObject getSndBuf(Ruby runtime) throws IOException {
        Channel socketChannel = openFile.getMainStream().getDescriptor().getChannel();
        return number(runtime,
                      (socketChannel instanceof SocketChannel) ? asSocket().getSendBufferSize() : 
                      ((socketChannel instanceof DatagramChannel) ? asDatagramSocket().getSendBufferSize() : 0)
                      );
    }

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                      ((socketChannel instanceof DatagramChannel) ? asDatagramSocket().getSendBufferSize() : 0)
                      );
    }


    private IRubyObject getReuseAddr(Ruby runtime) throws IOException {
        Channel socketChannel = openFile.getMainStream().getDescriptor().getChannel();
        return trueFalse(runtime,
                         (socketChannel instanceof ServerSocketChannel) ? asServerSocket().getReuseAddress() : false
                         );
    }

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                         (socketChannel instanceof ServerSocketChannel) ? asServerSocket().getReuseAddress() : false
                         );
    }


    private IRubyObject getTimeout(Ruby runtime) throws IOException {
        Channel socketChannel = openFile.getMainStream().getDescriptor().getChannel();
        return number(runtime,
                      (socketChannel instanceof SocketChannel) ? asSocket().getSoTimeout() : 
                      ((socketChannel instanceof ServerSocketChannel) ? asServerSocket().getSoTimeout() : 
                       ((socketChannel instanceof DatagramChannel) ? asDatagramSocket().getSoTimeout() : 0))
                      );

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    protected int getSoTypeDefault() {
        return 0;
    }


    private IRubyObject getSoType(Ruby runtime) throws IOException {
        Channel socketChannel = openFile.getMainStream().getDescriptor().getChannel();
        return number(runtime,
                      (socketChannel instanceof SocketChannel) ? RubySocket.SOCK_STREAM : 
                      ((socketChannel instanceof ServerSocketChannel) ? RubySocket.SOCK_STREAM : 
                       ((socketChannel instanceof DatagramChannel) ? RubySocket.SOCK_DGRAM : getSoTypeDefault()))
                      );

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            if (descriptor == null) {
                throw ruby.newErrnoEBADFError();
            }
            
            Channel mainChannel = descriptor.getChannel();


            if (mainChannel instanceof SocketChannel) {
                // ok, it's a socket...set values accordingly
                // just using AF_INET since we can't tell from SocketChannel...
                socket.soDomain = AF_INET;

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    public boolean selectForAccept(RubyIO io) {
        return select(io, SelectionKey.OP_ACCEPT);
    }
    
    public boolean select(RubyIO io, int ops) {
        Channel channel = io.getChannel();
        
        if (channel instanceof SelectableChannel) {
            SelectableChannel selectable = (SelectableChannel)channel;
            
            synchronized (selectable.blockingLock()) {

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            iowait.cancel();
        }
    }
    private volatile BlockingIO.Condition blockingIO = null;
    public boolean waitForIO(ThreadContext context, RubyIO io, int ops) {
        Channel channel = io.getChannel();


        if (!(channel instanceof SelectableChannel)) {
            return true;
        }
        try {

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        return 1;
    }
    
    public synchronized void ftruncate(long newLength) throws IOException,
            BadDescriptorException, InvalidValueException {
        Channel ch = descriptor.getChannel();
        if (!(ch instanceof FileChannel)) {
            throw new InvalidValueException();
        }
        invalidateBuffer();
        FileChannel fileChannel = (FileChannel)ch;

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        openFile.setMode(modes.getOpenFileFlags() | OpenFile.SYNC);
        openFile.setProcess(process);


        try {
            if (openFile.isReadable()) {
                Channel inChannel;
                if (process.getInput() != null) {
                    // NIO-based
                    inChannel = process.getInput();
                } else {
                    // Stream-based
                    inChannel = Channels.newChannel(process.getInputStream());
                }
                
                ChannelDescriptor main = new ChannelDescriptor(
                        inChannel,
                        getNewFileno(),
                        new FileDescriptor());
                main.setCanBeSeekable(false);
                
                openFile.setMainStream(new ChannelStream(getRuntime(), main));
                registerDescriptor(main);
            }
            
            if (openFile.isWritable()) {
                Channel outChannel;
                if (process.getOutput() != null) {
                    // NIO-based
                    outChannel = process.getOutput();
                } else {
                    outChannel = Channels.newChannel(process.getOutputStream());

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