RxJava：当 "The Observable Contract" 说 "happens-before" 时，它实际上是什么意思？
RxJava: When "The Observable Contract" says "happens-before", what does it actually mean?
Observables must issue notifications to observers serially (not in parallel). They may issue these notifications from different threads, but there must be a formal happens-before relationship between the notifications.
当它说“happens-before”时，是否意味着最后一个 onNext 通知的所有效果（例如，在 Observer.onNext() 方法中更改共享状态）将完全可见next onNext 通知，就像 happens-before 保证在 Java 内存模型?
看了SerializedObserver(RxJava version 3.0.11)的源码，发现synchronized代码块中没有调用downstream.onNext(t)方法。那么，我能说答案不是吗？
will be totally visible to the next onNext notification, just like happens-before guarantee in Java Memory Model?
是的。
SerializedObserver [...] I found downstream.onNext(t) method is not called in the synchronized code block. So, could I say the answer is not?
还是。 synchronized (this) 确保可见性以及 属性 由于 emitting 标志，只有一个线程将调用 onNext。
Observables must issue notifications to observers serially (not in parallel). They may issue these notifications from different threads, but there must be a formal happens-before relationship between the notifications.
当它说“happens-before”时，是否意味着最后一个 onNext 通知的所有效果（例如，在 Observer.onNext() 方法中更改共享状态）将完全可见next onNext 通知，就像 happens-before 保证在 Java 内存模型?
看了SerializedObserver(RxJava version 3.0.11)的源码，发现synchronized代码块中没有调用downstream.onNext(t)方法。那么，我能说答案不是吗？
will be totally visible to the next onNext notification, just like happens-before guarantee in Java Memory Model?
是的。
SerializedObserver [...] I found downstream.onNext(t) method is not called in the synchronized code block. So, could I say the answer is not?
还是。 synchronized (this) 确保可见性以及 属性 由于 emitting 标志，只有一个线程将调用 onNext。