Examples of java.nio.channels.SelectionKey

java.nio.channels.SelectionKey
A key that representing the relationship of a channel and the selector.

        return co;
    }


    protected <C> Connector<C> createServerConnector(SelectableChannel c, C context, Listener<C> l)
    {
        SelectionKey key = registerInterest(c,SelectionKey.OP_READ);
        Connector<C> co = new ConnectorImpl<C>(this, l, new SaslServerImpl(),(SocketChannel)c, context, key);
        key.attach(co);
        return co;
    }

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            if (session == null)
                break;


            SocketChannel ch = session.getChannel();
            SelectionKey key = session.getSelectionKey();
            // Retry later if session is not yet fully initialized.
            // (In case that Session.close() is called before addSession() is processed)
            if (key == null) {
                scheduleRemove(session);
                break;
            }
            // skip if channel is already closed
            if (!key.isValid()) {
                continue;
            }


            try {
                key.cancel();
                ch.close();
            } catch (IOException e) {
                session.getFilterChain().fireExceptionCaught(session, e);
            } finally {
                releaseWriteBuffers(session);

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        }
    }


    private void notifyWriteTimeout(SocketSessionImpl session,
            long currentTime, long writeTimeout, long lastIoTime) {
        SelectionKey key = session.getSelectionKey();
        if (writeTimeout > 0 && (currentTime - lastIoTime) >= writeTimeout
                && key != null && key.isValid()
                && (key.interestOps() & SelectionKey.OP_WRITE) != 0) {
            session.getFilterChain().fireExceptionCaught(session,
                    new WriteTimeoutException());
        }
    }

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            if (!session.isConnected()) {
                releaseWriteBuffers(session);
                continue;
            }


            SelectionKey key = session.getSelectionKey();
            // Retry later if session is not yet fully initialized.
            // (In case that Session.write() is called before addSession() is processed)
            if (key == null) {
                scheduleFlush(session);
                break;
            }


            // Skip if the channel is already closed.
            if (!key.isValid()) {
                continue;
            }


            try {
                boolean flushedAll = doFlush(session);

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            DatagramSessionImpl session = trafficControllingSessions.poll();


            if (session == null)
                break;


            SelectionKey key = session.getSelectionKey();
            // Retry later if session is not yet fully initialized.
            // (In case that Session.suspend??() or session.resume??() is
            // called before addSession() is processed)
            if (key == null) {
                scheduleTrafficControl(session);
                break;
            }
            // skip if channel is already closed
            if (!key.isValid()) {
                continue;
            }


            // The normal is OP_READ and, if there are write requests in the
            // session's write queue, set OP_WRITE to trigger flushing.
            int ops = SelectionKey.OP_READ;
            if (!session.getWriteRequestQueue().isEmpty()) {
                ops |= SelectionKey.OP_WRITE;
            }


            // Now mask the preferred ops with the mask of the current session
            int mask = session.getTrafficMask().getInterestOps();
            key.interestOps(ops & mask);
        }
    }

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        }
    }


    private boolean doFlush(SocketSessionImpl session) throws IOException {
        // Clear OP_WRITE
        SelectionKey key = session.getSelectionKey();
        key.interestOps(key.interestOps() & (~SelectionKey.OP_WRITE));


        SocketChannel ch = session.getChannel();
        Queue<WriteRequest> writeRequestQueue = session.getWriteRequestQueue();


        int writtenBytes = 0;
        int maxWrittenBytes = ((SocketSessionConfig) session.getConfig()).getSendBufferSize() << 1;
        try {
            for (;;) {
                WriteRequest req = writeRequestQueue.peek();


                if (req == null)
                    break;


                ByteBuffer buf = (ByteBuffer) req.getMessage();
                if (buf.remaining() == 0) {
                    writeRequestQueue.poll();


                    session.increaseWrittenMessages();


                    buf.reset();
                    session.getFilterChain().fireMessageSent(session, req);
                    continue;
                }


                if (key.isWritable()) {
                    writtenBytes += ch.write(buf.buf());
                }


                if (buf.hasRemaining() || writtenBytes >= maxWrittenBytes) {
                    // Kernel buffer is full or wrote too much.
                    key.interestOps(key.interestOps() | SelectionKey.OP_WRITE);
                    return false;
                }
            }
        } finally {
            session.increaseWrittenBytes(writtenBytes);

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    }


    private void processReadySessions(Set<SelectionKey> keys) {
        Iterator<SelectionKey> it = keys.iterator();
        while (it.hasNext()) {
            SelectionKey key = it.next();
            it.remove();


            DatagramSessionImpl session = (DatagramSessionImpl) key
                    .attachment();


            // Let the recycler know that the session is still active. 
            getSessionRecycler(session).recycle(session.getLocalAddress(),
                    session.getRemoteAddress());


            if (key.isReadable() && session.getTrafficMask().isReadable()) {
                readSession(session);
            }


            if (key.isWritable() && session.getTrafficMask().isWritable()) {
                scheduleFlush(session);
            }
        }
    }

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            SocketSessionImpl session = trafficControllingSessions.poll();


            if (session == null)
                break;


            SelectionKey key = session.getSelectionKey();
            // Retry later if session is not yet fully initialized.
            // (In case that Session.suspend??() or session.resume??() is
            // called before addSession() is processed)
            if (key == null) {
                scheduleTrafficControl(session);
                break;
            }
            // skip if channel is already closed
            if (!key.isValid()) {
                continue;
            }


            // The normal is OP_READ and, if there are write requests in the
            // session's write queue, set OP_WRITE to trigger flushing.
            int ops = SelectionKey.OP_READ;
            Queue<WriteRequest> writeRequestQueue = session
                    .getWriteRequestQueue();
            synchronized (writeRequestQueue) {
                if (!writeRequestQueue.isEmpty()) {
                    ops |= SelectionKey.OP_WRITE;
                }
            }


            // Now mask the preferred ops with the mask of the current session
            int mask = session.getTrafficMask().getInterestOps();
            key.interestOps(ops & mask);
        }
    }

View Full Code Here

        }
    }


    private boolean flush(DatagramSessionImpl session) throws IOException {
        // Clear OP_WRITE
        SelectionKey key = session.getSelectionKey();
        if (key == null) {
            scheduleFlush(session);
            return false;
        }
        if (!key.isValid()) {
            return false;
        }
        key.interestOps(key.interestOps() & (~SelectionKey.OP_WRITE));


        DatagramChannel ch = session.getChannel();
        Queue<WriteRequest> writeRequestQueue = session.getWriteRequestQueue();


        int writtenBytes = 0;
        int maxWrittenBytes = ((DatagramSessionConfig) session.getConfig()).getSendBufferSize() << 1;
        try {
            for (;;) {
                WriteRequest req = writeRequestQueue.peek();
        
                if (req == null)
                    break;
        
                ByteBuffer buf = (ByteBuffer) req.getMessage();
                if (buf.remaining() == 0) {
                    // pop and fire event
                    writeRequestQueue.poll();
        
                    session.increaseWrittenMessages();
                    buf.reset();
                    session.getFilterChain().fireMessageSent(session, req);
                    continue;
                }
        
                int localWrittenBytes = ch.write(buf.buf());
                writtenBytes += localWrittenBytes;
    
                if (localWrittenBytes == 0 || writtenBytes >= maxWrittenBytes) {
                    // Kernel buffer is full or wrote too much
                    key.interestOps(key.interestOps() | SelectionKey.OP_WRITE);
                    return false;
                } else {
                    key.interestOps(key.interestOps() & (~SelectionKey.OP_WRITE));
    
                    // pop and fire event
                    writeRequestQueue.poll();
    
                    session.increaseWrittenMessages();

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            // AbstractIoFilterChain will notify the connect future.
            session.setAttribute(AbstractIoFilterChain.CONNECT_FUTURE, req);


            boolean success = false;
            try {
                SelectionKey key = req.channel.register(selector,
                        SelectionKey.OP_READ, session);


                session.setSelectionKey(key);
                buildFilterChain(req, session);
                getSessionRecycler(session).put(session);

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