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.

        }


        @Override
        public String toString(){
            StringBuilder sb=new StringBuilder();
            Channel channel = sk.channel();
            if (channel instanceof SocketChannel) {
                sb.append(" ").append(((SocketChannel)channel).socket()
                                .getRemoteSocketAddress())
                  .append("[").append(Integer.toHexString(sk.interestOps()))
                  .append("](queued=").append(getOutstandingRequests())

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    public void releaseExclusiveReadLock(GenericFileOperations<File> operations,
                                         GenericFile<File> file, Exchange exchange) throws Exception {
        FileLock lock = ExchangeHelper.getMandatoryProperty(exchange, "CamelFileLock", FileLock.class);
        String lockFileName = ExchangeHelper.getMandatoryProperty(exchange, "CamelFileLockName", String.class);
        Channel channel = lock.channel();
        try {
            lock.release();
        } finally {
            // must close channel first
            IOHelper.close(channel, "while acquiring exclusive read lock for file: " + lockFileName, LOG);

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        try {
            altManager.rollCobertura();
        } catch (RuntimeException e) {
            assertTrue(e.getMessage().indexOf("cobertura") > -1);
        }
        Channel c = EasyMock.createMock(Channel.class);
        c.close();
        EasyMock.expectLastCall().andThrow(new IOException("No closing."));


        EasyMock.replay(c);
    }

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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);
                main.setCanBeSeekable(false);
                
                openFile.setMainStream(ChannelStream.open(getRuntime(), main));
            }
            
            if (openFile.isWritable() && process.hasOutput()) {
                Channel outChannel;
                if (process.getOutput() != null) {
                    // NIO-based
                    outChannel = process.getOutput();
                } else {
                    outChannel = Channels.newChannel(process.getOutputStream());

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            context.getThread().afterBlockingCall();
        }
    }
    
    private boolean waitWritable(Stream stream) {
        Channel ch = stream.getChannel();
        if (ch instanceof SelectableChannel) {
            getRuntime().getCurrentContext().getThread().select(ch, this, SelectionKey.OP_WRITE);
            return true;
        }
        return false;

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    private boolean waitReadable(Stream stream) {
        if (stream.readDataBuffered()) {
            return true;
        }
        Channel ch = stream.getChannel();
        if (ch instanceof SelectableChannel) {
            getRuntime().getCurrentContext().getThread().select(ch, this, SelectionKey.OP_READ);
            return true;
        }
        return false;

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     * @throws java.io.IOException if there is an exception during IO
     */
    public static ChannelDescriptor open(String cwd, String path, ModeFlags flags, int perm, POSIX posix, ClassLoader classLoader) throws FileNotFoundException, DirectoryAsFileException, FileExistsException, IOException {
        boolean fileCreated = false;
        if (path.equals("/dev/null") || path.equalsIgnoreCase("nul:") || path.equalsIgnoreCase("nul")) {
            Channel nullChannel = new NullChannel();
            // FIXME: don't use RubyIO for this
            return new ChannelDescriptor(nullChannel, flags);
        } else if (path.startsWith("file:")) {
            int bangIndex = path.indexOf("!");
            if (bangIndex > 0) {

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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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            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 = AddressFamily.AF_INET.value();

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                soType = RubyNumeric.fix2int(type);
            }


            soProtocol = RubyNumeric.fix2int(protocol);


            Channel channel = null;
            if(soType == Sock.SOCK_STREAM.value()) {
                channel = SocketChannel.open();
            } else if(soType == Sock.SOCK_DGRAM.value()) {
                channel = DatagramChannel.open();
            }

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