December 2019
Beginner to intermediate
330 pages
10h 7m
Chinese
Content preview from RxJava反应式编程
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RxJava 1.0
至
RxJava 2.0
的迁移指南
｜
281
始化逻辑，那么
onNext 有可能会看到初始化的效果，也有可能看不到。为了避免这种情
况，需要确保在 onSubscribe
/
onStart 中，等到所有的初始化都完成
后
再调用 request。
这种行为与
1.
x
不同，在
1.
x
中，
request 会经过一个延迟的逻辑来累积请求，直到上游的
Producer 在某个时刻出现（这种行为给所有
1.
x
中的操作符和消费者带来了一定的开销）。在
2.
x
中，始终会首先得到一个 Subscription，在
90%
的情况下没有必要对请求进行延迟。
C.1.13
Subscription
在
RxJava 1.
x
中，
rx.Subscription
接口负责流和资源的生命周期管理，即取消对序列的订
阅并释放通用的资源，如调度的任务。反应式流规范使用这个名称来指定源和消费者的交
互点：
org.reactivestreams.Subscription
。它允许请求上游流中的一个正数，并允许取消
对序列的订阅。
为了避免名称的冲突，
1.
x
的 rx.Subscription 重命名为 io.reactivex.Disposable（有点类
似于
.NET
自己的 IDisposable）。
因为反应式流规范的基础接口
org.reactivestreams.Publisher
将
subscribe()
方法定
义为
void
，所以
Flowable.subscribe(Subscriber)
不会再返回任何
Subscription
（或
Disposable ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.