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java | 切换线程
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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