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);//TODO this is not yet being used
                    } else if (ka.getComet() && ka.getCometNotify() ) {

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    protected void setCometTimeouts(SocketWrapper<NioChannel> socketWrapper) {
        // Comet support
        SelectionKey key = socketWrapper.getSocket().getIOChannel().keyFor(
                socketWrapper.getSocket().getPoller().getSelector());
        if (key != null) {
            NioEndpoint.KeyAttachment attach = (NioEndpoint.KeyAttachment) key.attachment();
            if (attach != null)  {
                attach.setComet(comet);
                if (comet) {
                    Integer comettimeout = (Integer) request.getAttribute(
                            org.apache.coyote.Constants.COMET_TIMEOUT_ATTR);

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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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            SelectionKey key;
            while (!stopped && (key = updateQueue.poll()) != null) {
                if (!key.isValid()) {
                    cleanupSelectionKey(key);
                }
                NIOServerCnxn cnxn = (NIOServerCnxn) key.attachment();
                if (cnxn.isSelectable()) {
                    key.interestOps(cnxn.getInterestOps());
                }
            }
        }

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            } else {
                final SelectionKey key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
                try {
                    boolean cancel = false;
                    if (key != null) {
                        final KeyAttachment att = (KeyAttachment) key.attachment();
                        if ( att!=null ) {
                            //handle callback flag
                            if (att.getComet() && (interestOps & OP_CALLBACK) == OP_CALLBACK ) {
                                att.setCometNotify(true);
                            } else {

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                        keyCount > 0 ? selector.selectedKeys().iterator() : null;
                    // Walk through the collection of ready keys and dispatch
                    // any active event.
                    while (iterator != null && iterator.hasNext()) {
                        SelectionKey sk = iterator.next();
                        KeyAttachment attachment = (KeyAttachment)sk.attachment();
                        // Attachment may be null if another thread has called
                        // cancelledKey()
                        if (attachment == null) {
                            iterator.remove();
                        } else {

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            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);//TODO this is not yet being used
                    } else if (ka.getComet() && ka.getCometNotify() ) {

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                        if (state == SocketState.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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