Examples of java.nio.channels.SelectionKey.attachment()

java.nio.channels.SelectionKey.attachment()
Gets the attached object. @return the attached object or null if no object has been attached

            int keycount = 0;
            for (Iterator<SelectionKey> iter = keys.iterator(); iter.hasNext(); ) {
                SelectionKey key = iter.next();
                keycount++;
                try {
                    KeyAttachment ka = (KeyAttachment) key.attachment();
                    if ( ka == null ) {
                        cancelledKey(key, SocketStatus.ERROR,false); //we don't support any keys without attachments
                    } else if ( ka.getError() ) {
                        cancelledKey(key, SocketStatus.ERROR,true);
                    } else if (ka.getComet() && ka.getCometNotify() ) {

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     * @throws IOException if an IO Exception occurs in the underlying socket logic
     */
    public int write(ByteBuffer buf, NioChannel socket, long writeTimeout,MutableInteger lastWrite) throws IOException {
        SelectionKey key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
        if ( key == null ) throw new IOException("Key no longer registered");
        KeyAttachment att = (KeyAttachment) key.attachment();
        int written = 0;
        boolean timedout = false;
        int keycount = 1; //assume we can write
        long time = System.currentTimeMillis(); //start the timeout timer
        try {

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     * @throws IOException if an IO Exception occurs in the underlying socket logic
     */
    public int read(ByteBuffer buf, NioChannel socket, long readTimeout) throws IOException {
        SelectionKey key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
        if ( key == null ) throw new IOException("Key no longer registered");
        KeyAttachment att = (KeyAttachment) key.attachment();
        int read = 0;
        boolean timedout = false;
        int keycount = 1; //assume we can write
        long time = System.currentTimeMillis(); //start the timeout timer
        try {

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                    // Walk through the collection of ready keys and dispatch
                    // any active event.
                    while (run && iterator != null && iterator.hasNext()) {
                        SelectionKey sk = (SelectionKey) iterator.next();
                        KeyAttachment attachment = (KeyAttachment)sk.attachment();
                        try {
                            attachment.access();
                            iterator.remove(); ;
                            sk.interestOps(sk.interestOps() & (~sk.readyOps()));
                            if ( sk.isReadable() ) {

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                    if (closed) {
                        // Close socket and pool
                        try {
                            KeyAttachment ka = null;
                            if (key!=null) {
                                ka = (KeyAttachment) key.attachment();
                                if (ka!=null) ka.setComet(false);
                                socket.getPoller().cancelledKey(key, SocketStatus.ERROR, false);
                            }
                            if (socket!=null) nioChannels.offer(socket);
                            socket = null;

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                        }
                    } 
                } else if (handshake == -1 ) {
                    KeyAttachment ka = null;
                    if (key!=null) {
                        ka = (KeyAttachment) key.attachment();
                        socket.getPoller().cancelledKey(key, SocketStatus.DISCONNECT, false);
                    }
                    if (socket!=null) nioChannels.offer(socket);
                    socket = null;
                    if ( ka!=null ) keyCache.offer(ka);

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                    if ( ka!=null ) keyCache.offer(ka);
                    ka = null;
                } else {
                    final SelectionKey fk = key;
                    final int intops = handshake;
                    final KeyAttachment ka = (KeyAttachment)fk.attachment();
                    ka.getPoller().add(socket,intops);
                }
            }catch(CancelledKeyException cx) {
                socket.getPoller().cancelledKey(key,null,false);
            } catch (OutOfMemoryError oom) {

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    public Object getAttachment(boolean remove) {
        Poller pol = getPoller();
        Selector sel = pol!=null?pol.getSelector():null;
        SelectionKey key = sel!=null?getIOChannel().keyFor(sel):null;
        Object att = key!=null?key.attachment():null;
        if (key != null && att != null && remove ) key.attach(null);
        return att;
    }
    /**
     * getBufHandler

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          synchronized (writeSelector.keys()) {
            calls = new ArrayList<Call>(writeSelector.keys().size());
            iter = writeSelector.keys().iterator();
            while (iter.hasNext()) {
              SelectionKey key = iter.next();
              Call call = (Call)key.attachment();
              if (call != null && key.channel() == call.connection.channel) { 
                calls.add(call);
              }
            }
          }

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        while (keys.hasNext()) {
            SelectionKey key = keys.next();
            keys.remove();


            ReactiveAsyncKey asyncKey =
                (ReactiveAsyncKey) key.attachment();


            int readyOps;
            synchronized (asyncKey) {
                if (!key.isValid()) {
                    continue;

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