Examples of io.netty.channel.MessageEvent

io.netty.channel.MessageEvent
A {@link ChannelEvent} which represents the transmission or reception of amessage. It can mean the notification of a received message or the request for writing a message, depending on whether it is an upstream event or a downstream event respectively. Please refer to the {@link ChannelEvent}documentation to find out what an upstream event and a downstream event are and what fundamental differences they have.

                // been fired.
                if (!delivering.get()) {
                    delivering.set(true);
                    try {
                        for (;;) {
                            MessageEvent e = writeBuffer.poll();
                            if (e == null) {
                                break;
                            }


                            e.getFuture().setSuccess();
                            fireMessageReceived(pairedChannel, e.getMessage());
                            fireWriteComplete(this, 1);
                        }
                    } finally {
                        delivering.set(false);
                    }
                }
            } else {
                // Channel is open and connected but channelConnected event has
                // not been fired yet.
            }
        } else {
            // Channel is closed or not connected yet - notify as failures.
            Exception cause;
            if (isOpen()) {
                cause = new NotYetConnectedException();
            } else {
                cause = new ClosedChannelException();
            }


            for (;;) {
                MessageEvent e = writeBuffer.poll();
                if (e == null) {
                    break;
                }


                e.getFuture().setFailure(cause);
                fireExceptionCaught(this, cause);
            }
        }
    }

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                // Unsupported - discard silently.
                future.setSuccess();
                break;
            }
        } else if (e instanceof MessageEvent) {
            MessageEvent event = (MessageEvent) e;
            DefaultLocalChannel channel = (DefaultLocalChannel) event.getChannel();
            boolean offered = channel.writeBuffer.offer(event);
            assert offered;
            channel.flushWriteBuffer();
        }
    }

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        if (!(evt instanceof MessageEvent)) {
            ctx.sendDownstream(evt);
            return;
        }


        MessageEvent e = (MessageEvent) evt;
        Object originalMessage = e.getMessage();
        Object encodedMessage = encode(ctx, e.getChannel(), originalMessage);
        if (originalMessage == encodedMessage) {
            ctx.sendDownstream(evt);
        } else if (encodedMessage != null) {
            write(ctx, e.getFuture(), encodedMessage, e.getRemoteAddress());
        }
    }

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        if (!(evt instanceof MessageEvent)) {
            ctx.sendUpstream(evt);
            return;
        }


        MessageEvent e = (MessageEvent) evt;
        Object originalMessage = e.getMessage();
        Object decodedMessage = decode(ctx, e.getChannel(), originalMessage);
        if (originalMessage == decodedMessage) {
            ctx.sendUpstream(evt);
        } else if (decodedMessage != null) {
            fireMessageReceived(ctx, decodedMessage, e.getRemoteAddress());
        }
    }

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            case INTEREST_OPS:
                channel.worker.setInterestOps(channel, future, ((Integer) value).intValue());
                break;
            }
        } else if (e instanceof MessageEvent) {
            MessageEvent event = (MessageEvent) e;
            NioSocketChannel channel = (NioSocketChannel) event.getChannel();
            boolean offered = channel.writeBufferQueue.offer(event);
            assert offered;
            channel.worker.writeFromUserCode(channel);
        }
    }

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            case INTEREST_OPS:
                OioWorker.setInterestOps(channel, future, ((Integer) value).intValue());
                break;
            }
        } else if (e instanceof MessageEvent) {
            MessageEvent event = (MessageEvent) e;
            OioSocketChannel channel = (OioSocketChannel) event.getChannel();
            ChannelFuture future = event.getFuture();
            Object message = event.getMessage();
            OioWorker.write(channel, future, message);
        }
    }

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            return true;
        }


        @Override
        public MessageEvent poll() {
            MessageEvent e = queue.poll();
            if (e != null) {
                int messageSize = getMessageSize(e);
                int newWriteBufferSize = writeBufferSize.addAndGet(-messageSize);
                int lowWaterMark = getConfig().getWriteBufferLowWaterMark();

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            case INTEREST_OPS:
                channel.worker.setInterestOps(channel, future, ((Integer) value).intValue());
                break;
            }
        } else if (e instanceof MessageEvent) {
            final MessageEvent event = (MessageEvent) e;
            final boolean offered = channel.writeBufferQueue.offer(event);
            assert offered;
            channel.worker.writeFromUserCode(channel);
        }
    }

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        final Queue<MessageEvent> writeBuffer = channel.writeBufferQueue;
        final int writeSpinCount = channel.getConfig().getWriteSpinCount();
        synchronized (channel.writeLock) {
            channel.inWriteNowLoop = true;
            for (;;) {
                MessageEvent evt = channel.currentWriteEvent;
                SendBuffer buf;
                if (evt == null) {
                    if ((channel.currentWriteEvent = evt = writeBuffer.poll()) == null) {
                        removeOpWrite = true;
                        channel.writeSuspended = false;
                        break;
                    }


                    channel.currentWriteBuffer = buf = sendBufferPool.acquire(evt.getMessage());
                } else {
                    buf = channel.currentWriteBuffer;
                }


                ChannelFuture future = evt.getFuture();
                try {
                    long localWrittenBytes = 0;
                    for (int i = writeSpinCount; i > 0; i --) {
                        localWrittenBytes = buf.transferTo(ch);
                        if (localWrittenBytes != 0) {

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        Exception cause = null;
        boolean fireExceptionCaught = false;


        // Clean up the stale messages in the write buffer.
        synchronized (channel.writeLock) {
            MessageEvent evt = channel.currentWriteEvent;
            if (evt != null) {
                // Create the exception only once to avoid the excessive overhead
                // caused by fillStackTrace.
                if (channel.isOpen()) {
                    cause = new NotYetConnectedException();
                } else {
                    cause = new ClosedChannelException();
                }


                ChannelFuture future = evt.getFuture();
                channel.currentWriteBuffer.release();
                channel.currentWriteBuffer = null;
                channel.currentWriteEvent = null;
                evt = null;
                future.setFailure(cause);
                fireExceptionCaught = true;
            }


            Queue<MessageEvent> writeBuffer = channel.writeBufferQueue;
            if (!writeBuffer.isEmpty()) {
                // Create the exception only once to avoid the excessive overhead
                // caused by fillStackTrace.
                if (cause == null) {
                    if (channel.isOpen()) {
                        cause = new NotYetConnectedException();
                    } else {
                        cause = new ClosedChannelException();
                    }
                }


                for (;;) {
                    evt = writeBuffer.poll();
                    if (evt == null) {
                        break;
                    }
                    evt.getFuture().setFailure(cause);
                    fireExceptionCaught = true;
                }
            }
        }

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