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

          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(it.hasNext()) {
                            SelectionKey sk = (SelectionKey)it.next();
                            if(sk.isAcceptable()) {
                                acceptConnections();
                            } else {
                                SocketConnection sc = (SocketConnection)sk.attachment();
                                sc.process(sk);
                            }
                            it.remove();
                        }
                    }

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                                statusDropsConnection(response.getStatus());
                    }
                    // Comet support
                    SelectionKey key = socket.getIOChannel().keyFor(socket.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.tomcat.comet.timeout");
                                if (comettimeout != null) attach.setTimeout(comettimeout.longValue());

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            comet = false;
            cometClose = true;
            SelectionKey key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
            if ( key != null ) {
                NioEndpoint.KeyAttachment attach = (NioEndpoint.KeyAttachment) key.attachment();
                if ( attach!=null && attach.getComet()) {
                    //if this is a comet connection
                    //then execute the connection closure at the next selector loop
                    //request.getAttributes().remove("org.apache.tomcat.comet.timeout");
                    //attach.setTimeout(5000); //force a cleanup in 5 seconds

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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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        throws IOException {


        //prevent timeout for async,
        SelectionKey key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
        if (key != null) {
            NioEndpoint.KeyAttachment attach = (NioEndpoint.KeyAttachment) key.attachment();
            attach.access();
        }


        //write to the socket, if there is anything to write
        if (socket.getBufHandler().getWriteBuffer().position() > 0) {

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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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                    Iterator iterator = 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 = (SelectionKey) 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 (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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