使用 XPCOM 回调
我想实现类似于计时器组件的观察者模式。不是按时间到期调用回调，而是从系统事件（如创建新文件或收到新电子邮件等）调用作为主题观察者的回调。我尝试在组件 XPCOM 中使用 nsIObserverService，但组件中的函数似乎无法使用 NotifyObservers 调用 JavaScript 中的观察者。 NotifyObservers 仅在从 JavaScript 调用时才起作用。
提前致谢
I would like to implement the observer pattern similar to Timer component. Instead of calling a callback by time expiration, the callbacks that are observers of a topic would be called from system events (like new file created, or a new e-mail received, etc.). I tried using nsIObserverService in the component XPCOM, but it seems that functions from component aren't able to call observers in JavaScript by using NotifyObservers. The NotifyObservers only works when is called from JavaScript.
Thanks in advance
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Example::Example始终在主线程上运行（因为它是由您的脚本创建的）。因此它永远不会创建观察者服务的代理。但是从Ex::Run对Example::Call的调用发生在后台线程上，我认为在这种情况下对NotifyObservers的调用返回NS_ERROR_UNEXPECTED（您忽略它）。Example::Examplealways runs on the main thread (because it's being created by your script). So it never creates a proxy to the observer service. But the call toExample::CallfromEx::Runhappens on the background thread, and I think in this case the call toNotifyObserversreturnsNS_ERROR_UNEXPECTED(which you ignore).