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.

            throw runtime.newErrnoEPIPEError();
        }
    }


    protected boolean waitWritable(ChannelDescriptor descriptor) throws IOException {
        Channel channel = descriptor.getChannel();
        if (channel == null || !(channel instanceof SelectableChannel)) {
            return false;
        }
       
        Selector selector = Selector.open();

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        }
        return false;
    }


    protected boolean waitReadable(ChannelDescriptor descriptor) throws IOException {
        Channel channel = descriptor.getChannel();
        if (channel == null || !(channel instanceof SelectableChannel)) {
            return false;
        }
       
        Selector selector = Selector.open();

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    private static RubyIO convertToIO(ThreadContext context, IRubyObject obj) {
        return (RubyIO)TypeConverter.convertToType(obj, context.getRuntime().getIO(), MethodIndex.TO_IO, "to_io");
    }
   
    private static boolean registerSelect(ThreadContext context, Selector selector, IRubyObject obj, RubyIO ioObj, int ops) throws IOException {
       Channel channel = ioObj.getChannel();
       if (channel == null || !(channel instanceof SelectableChannel)) {
           return false;
       }
       
       ((SelectableChannel) channel).configureBlocking(false);

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        // must call super
        super.releaseExclusiveReadLock(operations, file, exchange);


        if (lock != null) {
            Channel channel = lock.channel();
            try {
                lock.release();
            } finally {
                // must close channel first
                IOHelper.close(channel, "while releasing exclusive read lock for file: " + lockFileName, LOG);

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      @Override
      public void expire(Object key, Object val) {
        try {
          if (val!=null) {
            if(val instanceof Channel){
              Channel channel = (Channel) val;
              channel.close();    
            }else if(val instanceof BufferFileInputStream){
              BufferFileInputStream is=(BufferFileInputStream)val;
              is.close();
            }
          }

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        return true;
    }


    public void commit(FileEndpoint endpoint, FileExchange exchange, File file) throws Exception {
        if (isLockFile()) {
            Channel channel = ExchangeHelper.getMandatoryProperty(exchange, "org.apache.camel.fileChannel", Channel.class);
            String lockfile = ExchangeHelper.getMandatoryProperty(exchange, "org.apache.camel.file.lock.name", String.class);
            if (LOG.isDebugEnabled()) {
                LOG.debug("Unlocking file: " + file);
            }
            channel.close();
            File lock = new File(lockfile);
            lock.delete();
        }
    }

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        }


        @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 ByteChannel channel() {
        return this.channel;
    }
    
    public SocketAddress getLocalAddress() {
        Channel channel = this.key.channel();
        if (channel instanceof SocketChannel) {
            return ((SocketChannel)channel).socket().getLocalSocketAddress();
        } else {
            return null;
        }

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            return null;
        }
    }


    public SocketAddress getRemoteAddress() {
        Channel channel = this.key.channel();
        if (channel instanceof SocketChannel) {
            return ((SocketChannel)channel).socket().getRemoteSocketAddress();
        } else {
            return null;
        }

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        if (this.selector.isOpen()) {
            Set<SelectionKey> keys = this.selector.keys();
            for (Iterator<SelectionKey> it = keys.iterator(); it.hasNext(); ) {
                try {
                    SelectionKey key = it.next();
                    Channel channel = key.channel();
                    if (channel != null) {
                        channel.close();
                    }
                } catch (IOException ignore) {
                }
            }
            // Stop dispatching I/O events

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