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

java.nio.channels.SelectionKey.attach()
Attaches an object to the key. @param anObject the object to attach @return the last attached object

    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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                    return;
                }
            }
            try {
                SelectionKey key = serverChannel.register(this.selector, SelectionKey.OP_ACCEPT);
                key.attach(request);
                request.setKey(key);
            } catch (IOException ex) {
                throw new IOReactorException("Failure registering channel " +
                        "with the selector", ex);
            }

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        Reader reader = getReader();
        try {
          reader.startAdd();
          SelectionKey readKey = reader.registerChannel(channel);
          c = getConnection(channel, System.currentTimeMillis());
          readKey.attach(c);
          synchronized (connectionList) {
            connectionList.add(numConnections, c);
            numConnections++;
          }
          if (LOG.isDebugEnabled())

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                    if ((k.readyOps() & SelectionKey.OP_ACCEPT) != 0) {
                        SocketChannel sc = ((ServerSocketChannel) k.channel()).accept();
                        sc.configureBlocking(false);
                        SelectionKey sk = sc.register(selector, SelectionKey.OP_READ);
                        Cnxn cnxn = new Cnxn(sc, sk);
                        sk.attach(cnxn);
                        addCnxn(cnxn);
                    } else if ((k.readyOps() & (SelectionKey.OP_READ | SelectionKey.OP_WRITE)) != 0) {
                        Cnxn c = (Cnxn) k.attachment();
                        c.doIO(k);
                    }

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                    sessionRequest.completed(session);
                }
                sessionCreated(key, session);
            } catch (CancelledKeyException ex) {
                queueClosedSession(session);
                key.attach(null);
            }
        }
    }


    private void processClosedSessions() {

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                        "with the selector", ex);
            }


            SessionRequestHandle requestHandle = new SessionRequestHandle(request); 
            try {
                key.attach(requestHandle);
                key.interestOps(SelectionKey.OP_CONNECT);
            } catch (CancelledKeyException ex) {
                // Ignore cancelled keys
            }
        }

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                // accept the connection
                client = (TNonblockingTransport) serverTransport.accept();
                clientKey = client.registerSelector(selector, SelectionKey.OP_READ);
                // add this key to the map
                FrameBuffer frameBuffer = new FrameBuffer(client, clientKey);
                clientKey.attach(frameBuffer);
            } catch (TTransportException ex)
            {
                // ignore this might have been handled by the other threads.
                // serverTransport.accept() as it returns null as nothing to accept.
                return;

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            Iterator<SelectionKey> it = selector.keys().iterator();
            // look at each key in the selected set
            while (it.hasNext()) {
                SelectionKey key = it.next();
                key.channel().close();
                key.attach(null);
                key.cancel();
            }
        }catch ( IOException ignore ){
            if (log.isWarnEnabled()) {
                log.warn("Unable to cleanup on selector close.",ignore);

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        Reader reader = getReader();
        try {
          reader.startAdd();
          SelectionKey readKey = reader.registerChannel(channel);
          c = getConnection(channel, System.currentTimeMillis());
          readKey.attach(c);
          synchronized (connectionList) {
            connectionList.add(numConnections, c);
            numConnections++;
          }
          if (LOG.isDebugEnabled())

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        Reader reader = getReader();
        try {
          reader.startAdd();
          SelectionKey readKey = reader.registerChannel(channel);
          c = getConnection(channel, System.currentTimeMillis());
          readKey.attach(c);
          synchronized (connectionList) {
            connectionList.add(numConnections, c);
            numConnections++;
          }
          if (LOG.isDebugEnabled())

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