Rx Creating Operators, observeOn, subscribeOn

•

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This document discusses the observeOn and subscribeOn operators in RxJava. ObserveOn sets the Scheduler on which observers will observe the Observable. SubscribeOn sets the Scheduler on which the Observable will emit items. Several examples are provided to illustrate the difference between the two operators and how they affect the threading of Observable execution. Links to additional documentation resources on RxJava operators are also included.

Software

Creating Operators
observeOn/subscribeOn
Practice

Creating Operators
• Create
• Defer
• Empty/Never/Throw
• From
• Interval
• Just
• Range
• Repeat
• Start
• Timer

https://github.com/gdgand/android-rxjava/tree/master/
2016-06-22_operators_creating

observeOn, subscribeOn
Observable 이 동작할 Scheduler 를 지정
해당 Observable 을 observe(관찰) 할 옵저버의
Scheduler를 지정
http://reactivex.io/documentation/operators/observeon.html
http://reactivex.io/documentation/operators/subscribeon.html

map 1 --> main
subscribe --> main
observeOn

map 1 --> main
subscribe --> RxIoScheduler-2
observeOn

map 1 --> main
map 2 --> main
subscribe --> RxIoScheduler-2
observeOn

map 1 --> main
map 2 --> RxIoScheduler-2
subscribe --> RxIoScheduler-2
observeOn

• ObserveOn
• Observer (operator 혹은 subscriber) 의 observe(관찰, 혹은 동작)
스레드 지정
• observeOn 이 호출 된 후 ‘다시’ 호출되기 전까지 유지됨.
observeOn

map 1 --> main
map 2 --> RxIoScheduler-2
map 3 --> RxNewThreadScheduler-3
subscribe --> RxNewThreadScheduler-3
observeOn
동작되는 스레드를 아시겠나요?

subscribeOn
map 1 --> main
subscribe --> main

subscribeOn
map 1 --> RxIoScheduler-2
subscribe --> RxIoScheduler-2

subscribeOn
observable --> RxIoScheduler-2
map 1 --> RxIoScheduler-2
subscribe --> RxIoScheduler-2

subscribeOn
observable --> RxIoScheduler-2
map 1 --> RxNewThreadScheduler-1
subscribe --> RxComputationScheduler-3

• subscribeOn
• Observable 의 데이터 emit 의 스레드를 지정.
• 여러번 subscribeOn을 하더라도 최초에 호출한 스레드를 유지함.
subscribeOn

• http://goo.gl/ztz2as
• http://docs.couchbase.com/developer/java-2.0/observables.html
• http://reactivex.io/documentation/operators.html#creating
• https://github.com/ReactiveX/RxJava/wiki/Creating-Observables
• http://reactivex.io/documentation/contract.html
• http://reactivex.io/documentation/observable.html
• http://tomstechnicalblog.blogspot.kr/2016/02/rxjava-understanding-observeon-and.html
• http://reactivex.io/documentation/operators/observeon.html
• http://reactivex.io/documentation/operators/subscribeon.html
• https://github.com/square/retroﬁt/blob/d04f3a50e41ca01d22f370ac4f332f6ddf4ba9fe/retroﬁt-adapters/
rxjava/src/main/java/retroﬁt2/adapter/rxjava/RxJavaCallAdapterFactory.java

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