netty-AbstractChannel

最新推荐文章于 2025-06-30 21:32:57 发布

原创最新推荐文章于 2025-06-30 21:32:57 发布 · 120 阅读

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本文探讨了Netty框架中Channel的可写性判断逻辑，解析了protectedAbstractChannel类中isWritable方法的实现原理，该方法通过检查ChannelOutboundBuffer的状态来确定Channel是否可以进行写操作。

 protected AbstractChannel(Channel parent) {
        this.parent = parent;
        id = newId();
        unsafe = newUnsafe();
        pipeline = newChannelPipeline();
    }
        @Override
    public boolean isWritable() {
        ChannelOutboundBuffer buf = unsafe.outboundBuffer();
        return buf != null && buf.isWritable();
    }

ChannelOutboundBuffer.isWritable()

/**
    * Returns {@code true} if and only if {@linkplain #totalPendingWriteBytes() the total number of pending bytes} did
    * not exceed the write watermark of the {@link Channel} and
    * no {@linkplain #setUserDefinedWritability(int, boolean) user-defined writability flag} has been set to
    * {@code false}.
    */
   public boolean isWritable() {
       return unwritable == 0;
   }