DefaultChannelPipeline之channelActive

原创

kq1983 2021-08-25 09:11:07 博主文章分类：netty ©著作权

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register0

入口 AbstractChannel.register0

private void register0(ChannelPromise promise) {
            try {
               ..................
                boolean firstRegistration = neverRegistered;
                doRegister();
                neverRegistered = false;
                registered = true;
               
                pipeline.invokeHandlerAddedIfNeeded();

                safeSetSuccess(promise);
                pipeline.fireChannelRegistered();
                ....................
                if (isActive()) {
                    if (firstRegistration) {
                        pipeline.fireChannelActive(); // channelActive入口
                    } else if (config().isAutoRead()) {
                       
                        beginRead();
                    }
                }

fireChannelActive

DefaultChannelPipeline

public final ChannelPipeline fireChannelActive() {
        AbstractChannelHandlerContext.invokeChannelActive(head);
        return this;
    }

invokeChannelActive

AbstractChannelHandlerContext

private void invokeChannelActive() {
        if (invokeHandler()) {
            try {
                ((ChannelInboundHandler) handler()).channelActive(this);
            } catch (Throwable t) {
                notifyHandlerException(t);
            }
        } else {
            fireChannelActive();
        }
    }

fireChannelActive

public ChannelHandlerContext fireChannelActive() {
        invokeChannelActive(findContextInbound(MASK_CHANNEL_ACTIVE)); // 依次调用下一个
        return this;
    }