RxJava 2.0.0 RC5 发布了，该版本包含API修复和增强，进一步清理代码和javadoc更好的测试覆盖率和错误修正。RxJava 是一个在 Java VM 上使用可观测的序列来组成异步的、基于事件的程序的库。

更新内容：

API 增强

1. Pull 4685: Test static from methods and add Maybe.fromSingle & fromCompletable

2. Pull 4687: Add Observable.rangeLong & Flowable.rangeLong.

3. Pull 4690: BaseTestConsumer add assertValueAt(index, Predicate<T>).

4. Pull 4711: Decouple stream operators from Function interface (FlowableOperator and co).

5. Pull 4712: make Observable.sequenceEqual return Single

6. Pull 4714: have Flowable.toList(Callable) return Single

7. Pull 4720: remove variance from the input source of retryWhen

8. Pull 4723: remove flatMapIterable(Function, int) overload and haveflatMapIterable(Function) use the flatten operator.

9. Pull 4729: Merge FlowableEmitter.BackpressureMode into BackpressureStrategy

10. Pull 4710: Remove checked exceptions from transformer interfaces.

性能增强

1. Pull 4723: enable fusion on Observable.observeOn

Bug修复

1. Pull 4681: Fix Flowable + Single elementAt and elementAtOrError operators on empty sources.

2. Pull 4686: Fix flatMapX over-cancellation in case of an inner error.

3. Pull 4689: Fix doOnEvent NPE on dispose()

4. Pull 4695: CompositeException fix order of exceptions

5. Pull 4696: Fix inner Throwable order for CompletablePeek

6. Pull 4705: fix Observable.flatMap's dispose behavior and error accumulation

7. Pull 4707: Fix Flowable.elementAt on empty sources.

8. Pull 4708: fix Observable.publish(Function) latecommer behavior

9. Pull 4712: fix Observable.combineLatest error management, fix Observable.flatMapmaxConcurrency behavior with scalars, use of unbounded queue, fixObservable.timeInterval not saving the Disposable

10. Pull 4723: fix fusion of Observable.just, fix Observable.replay() potential emission beforeonSubscribe call

11. Pull 4731: Delegate null Collections down to onError in toList

12. Pull 4736: fix onBackpressureBuffer(long, Action, BufferOverflowStrategy) return type, fixconcatMapDelayError wrong barrier mode selected.

13. Pull 4738: Fix Flowable.flatMap error, cancellation and resource management.

清除

1. Pull 4689: Remove Maybe.toCompletable, use Maybe.ignoreElement.

2. Pull 4708: remove bufferSize overloads of Observable.publish as there is no need to buffer anything for an Observable

3. Pull 4723: remove flatMapIterable(Function, int) overload

其他更新

1. Pull 4682: Update Mockito to 2.1.0

2. Pull 4699: Clean up null usages by using ObjectHelper.requireNonNull.

下载地址：

• Source code (zip)

• Source code (tar.gz)