EpollDomainDatagramChannelUnsafe Class — netty Architecture

Source Code

transport-classes-epoll/src/main/java/io/netty/channel/epoll/EpollDomainDatagramChannel.java lines 287–378

    final class EpollDomainDatagramChannelUnsafe extends AbstractEpollUnsafe {

        @Override
        void epollInReady() {
            assert eventLoop().inEventLoop();
            final DomainDatagramChannelConfig config = config();
            if (shouldBreakEpollInReady(config)) {
                clearEpollIn0();
                return;
            }
            final EpollRecvByteAllocatorHandle allocHandle = recvBufAllocHandle();
            final ChannelPipeline pipeline = pipeline();
            final ByteBufAllocator allocator = config.getAllocator();
            allocHandle.reset(config);

            Throwable exception = null;
            try {
                ByteBuf byteBuf = null;
                try {
                    boolean connected = isConnected();
                    do {
                        byteBuf = allocHandle.allocate(allocator);
                        allocHandle.attemptedBytesRead(byteBuf.writableBytes());

                        final DomainDatagramPacket packet;
                        if (connected) {
                            allocHandle.lastBytesRead(doReadBytes(byteBuf));
                            if (allocHandle.lastBytesRead() <= 0) {
                                // nothing was read, release the buffer.
                                byteBuf.release();
                                break;
                            }
                            packet = new DomainDatagramPacket(byteBuf, (DomainSocketAddress) localAddress(),
                                    (DomainSocketAddress) remoteAddress());
                        } else {
                            final DomainDatagramSocketAddress remoteAddress;
                            if (byteBuf.hasMemoryAddress()) {
                                // has a memory address so use optimized call
                                remoteAddress = socket.recvFromAddressDomainSocket(byteBuf.memoryAddress(),
                                        byteBuf.writerIndex(), byteBuf.capacity());
                            } else {
                                ByteBuffer nioData = byteBuf.internalNioBuffer(
                                        byteBuf.writerIndex(), byteBuf.writableBytes());
                                remoteAddress =
                                        socket.recvFromDomainSocket(nioData, nioData.position(), nioData.limit());
                            }

                            if (remoteAddress == null) {
                                allocHandle.lastBytesRead(-1);
                                byteBuf.release();
                                break;
                            }
                            DomainSocketAddress localAddress = remoteAddress.localAddress();
                            if (localAddress == null) {
                                localAddress = (DomainSocketAddress) localAddress();
                            }
                            allocHandle.lastBytesRead(remoteAddress.receivedAmount());
                            byteBuf.writerIndex(byteBuf.writerIndex() + allocHandle.lastBytesRead());

                            packet = new DomainDatagramPacket(byteBuf, localAddress, remoteAddress);
                        }

                        allocHandle.incMessagesRead(1);

                        readPending = false;
                        pipeline.fireChannelRead(packet);

                        byteBuf = null;

                        // We use the TRUE_SUPPLIER as it is also ok to read less then what we did try to read (as long
                        // as we read anything).
                    } while (allocHandle.continueReading(UncheckedBooleanSupplier.TRUE_SUPPLIER));
                } catch (Throwable t) {
                    if (byteBuf != null) {
                        byteBuf.release();
                    }
                    exception = t;
                }

                allocHandle.readComplete();
                pipeline.fireChannelReadComplete();