Observable(可被监听序列)
Single
- Success(相当于 Next) 或 Failure
Completable
- Completed 或 Error
Maybe
- Success(等价于 Next) 或 Error 或 Completed
Observable & Observer (可被监听序列 OR 观察者)
AsyncSubject
PublishSubject
ReplaySubject
BehaviorSubject
Event
- Next(element)
- Error(error)
- Completed