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

                    Set<SelectableChannel> added = new HashSet<SelectableChannel>();
                    while ((ch = registrationQueue.poll()) != null) {
                        SelectionKey k = ch.channel.keyFor(selector);
                        List<IOChannel> waitq = k == null
                                ? new LinkedList<IOChannel>()
                                : (List<IOChannel>) k.attachment();
                        ch.channel.register(selector, ch.ops, waitq);
                        waitq.add(ch);
                        added.add(ch.channel);
                    }

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        while(selector.select() == 0);


        for (Iterator i = selector.selectedKeys().iterator(); i.hasNext(); ) {
            SelectionKey skey = (SelectionKey) i.next();
            if ((skey.interestOps() & skey.readyOps() & (SelectionKey.OP_READ | SelectionKey.OP_ACCEPT)) != 0) {
                if(skey.attachment() == descriptor) {
                    return true;
                }
            }
        }
        return false;

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           List e = new ArrayList();
           for (Iterator i = selector.selectedKeys().iterator(); i.hasNext(); ) {
               SelectionKey key = (SelectionKey) i.next();
               if ((key.interestOps() & key.readyOps()
                       & (SelectionKey.OP_READ|SelectionKey.OP_ACCEPT|SelectionKey.OP_CONNECT)) != 0) {
                   r.add(key.attachment());
                   pending.remove(key.attachment());
               }
               if ((key.interestOps() & key.readyOps() & (SelectionKey.OP_WRITE)) != 0) {
                   w.add(key.attachment());
               }

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           for (Iterator i = selector.selectedKeys().iterator(); i.hasNext(); ) {
               SelectionKey key = (SelectionKey) i.next();
               if ((key.interestOps() & key.readyOps()
                       & (SelectionKey.OP_READ|SelectionKey.OP_ACCEPT|SelectionKey.OP_CONNECT)) != 0) {
                   r.add(key.attachment());
                   pending.remove(key.attachment());
               }
               if ((key.interestOps() & key.readyOps() & (SelectionKey.OP_WRITE)) != 0) {
                   w.add(key.attachment());
               }
           }

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                       & (SelectionKey.OP_READ|SelectionKey.OP_ACCEPT|SelectionKey.OP_CONNECT)) != 0) {
                   r.add(key.attachment());
                   pending.remove(key.attachment());
               }
               if ((key.interestOps() & key.readyOps() & (SelectionKey.OP_WRITE)) != 0) {
                   w.add(key.attachment());
               }
           }
           r.addAll(pending);
           r.addAll(unselectable_reads);
           w.addAll(unselectable_writes);

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           for (Iterator i = selector.keys().iterator(); i.hasNext(); ) {
               SelectionKey key = (SelectionKey) i.next();
               SelectableChannel channel = key.channel();
               synchronized(channel.blockingLock()) {
                   RubyIO originalIO = (RubyIO) TypeConverter.convertToType(
                           (IRubyObject) key.attachment(), runtime.getIO(),
                           MethodIndex.TO_IO, "to_io");
                   boolean blocking = originalIO.getBlocking();
                   key.cancel();
                   channel.configureBlocking(blocking);
               }

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        while(selector.select() == 0);


        for (Iterator i = selector.selectedKeys().iterator(); i.hasNext(); ) {
            SelectionKey skey = (SelectionKey) i.next();
            if ((skey.interestOps() & skey.readyOps() & (SelectionKey.OP_WRITE)) != 0) {
                if(skey.attachment() == descriptor) {
                    return true;
                }
            }
        }
        return false;

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        /**
         * {@inheritDoc}
         */
        public NioSession next() {
            SelectionKey key = iterator.next();
            NioSession nioSession = (NioSession) key.attachment();
            return nioSession;
        }


        /**
         * {@inheritDoc}

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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 ((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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