Redission 队列底层实现原理详解

Netty协议解码与RedisPub/Sub事件处理：Java实现,

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已于 2024-05-25 09:32:04 修改 · 431 阅读

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#java #redis

于 2024-05-11 10:11:47 首次发布

关键两个类：

CommandPubSubDecoder.java

// Netty 读取到数据后，发送给 redission  
protected void decodeCommand(Channel channel, ByteBuf in, QueueCommand data, int endIndex) throws Exception {
        try {
            while (in.writerIndex() > in.readerIndex()) {
                if (data != null) {
                    if (((CommandData<Object, Object>) data).getPromise().isDone()) {
                        data = null;
                    }
                }
                decode(in, (CommandData<Object, Object>) data, null, channel, false, null, 0);
            }
            sendNext(channel, data);//数据读取完成后，调用 消息发送
        } catch (Exception e) {
            log.error("Unable to decode data. channel: {}, reply: {}", channel, LogHelper.toString(in), e);
            if (data != null) {
                data.tryFailure(e);
            }
            sendNext(channel);
            throw e;
        }
    }

CommandDecoder .java

调用父类进行协议解析

    @Override
    protected final void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        QueueCommandHolder holder = getCommand(ctx);
        QueueCommand data = null;
        if (holder != null) {
            data = holder.getCommand();
        }

        if (state() =