AbstractNioMessageChannel Class — netty Architecture

Source Code

transport/src/main/java/io/netty/channel/nio/AbstractNioMessageChannel.java lines 34–207

public abstract class AbstractNioMessageChannel extends AbstractNioChannel {
    boolean inputShutdown;

    /**
     * @see AbstractNioChannel#AbstractNioChannel(Channel, SelectableChannel, int)
     */
    protected AbstractNioMessageChannel(Channel parent, SelectableChannel ch, int readInterestOp) {
        super(parent, ch, readInterestOp);
    }

    protected AbstractNioMessageChannel(Channel parent, SelectableChannel ch, NioIoOps readOps) {
        super(parent, ch, readOps);
    }

    @Override
    protected AbstractNioUnsafe newUnsafe() {
        return new NioMessageUnsafe();
    }

    @Override
    protected void doBeginRead() throws Exception {
        if (inputShutdown) {
            return;
        }
        super.doBeginRead();
    }

    protected boolean continueReading(RecvByteBufAllocator.Handle allocHandle) {
        return allocHandle.continueReading();
    }

    private final class NioMessageUnsafe extends AbstractNioUnsafe {

        private final List<Object> readBuf = new ArrayList<Object>();

        @Override
        public void read() {
            assert eventLoop().inEventLoop();
            final ChannelConfig config = config();
            final ChannelPipeline pipeline = pipeline();
            final RecvByteBufAllocator.Handle allocHandle = unsafe().recvBufAllocHandle();
            allocHandle.reset(config);

            boolean closed = false;
            Throwable exception = null;
            try {
                try {
                    do {
                        int localRead = doReadMessages(readBuf);
                        if (localRead == 0) {
                            break;
                        }
                        if (localRead < 0) {
                            closed = true;
                            break;
                        }

                        allocHandle.incMessagesRead(localRead);
                    } while (continueReading(allocHandle));
                } catch (Throwable t) {
                    exception = t;
                }

                int size = readBuf.size();
                for (int i = 0; i < size; i ++) {
                    readPending = false;
                    pipeline.fireChannelRead(readBuf.get(i));
                }
                readBuf.clear();
                allocHandle.readComplete();
                pipeline.fireChannelReadComplete();

                if (exception != null) {
                    closed = closeOnReadError(exception);

                    pipeline.fireExceptionCaught(exception);
                }

                if (closed) {
                    inputShutdown = true;
                    if (isOpen()) {