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java | 切换线程

 1 year ago
source link: https://benpaodewoniu.github.io/2023/01/24/java191/
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java | 切换线程 | 犀牛的博客

姑苏城外一茅屋，万树梅花月满天

eventloop 是如何切换线程的。

看 netty 的源码，如下

static void invokeChannelRead(final AbstractChannelHandlerContext next, Object msg) {
    final Object m = next.pipeline.touch(ObjectUtil.checkNotNull(msg, "msg"), next);
    EventExecutor executor = next.executor();
    if (executor.inEventLoop()) { // 判断当前 handler 的线程，是否和 eventloop 在同一个线程
        next.invokeChannelRead(m);
    } else {
        executor.execute(new Runnable() {
            public void run() {
                next.invokeChannelRead(m);
            }
        });
    }

}

如果两个 handler 绑定的是同一个线程，直接调用，否则，将调用代码包装成一个任务对象，由下一个 handler 的线程调度。


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