在RXjava中应用重试 [英] Apply retries in a RXjava

问题描述

我想运行一个使用RXJava重试的方法

I want to run a method with retries using RXJava

return Observable
        .just(myObj)
        .flatMap(doc ->
                myFunc(myObj, ....)
        )
        .doOnError(e -> log.Error())
        .onErrorResumeNext(myObj2 ->
                methodIWantToRunWithRetries(...)
                        .onErrorResumeNext(myObj3 ->
                                methodIWantToRunWithRetries(...)
                        )

        );
}

如果我使用 onErrorResumeNext 我需要多次嵌套我想要重试。

（除非我想用try / catch包围它）

If I use onErrorResumeNext I need to nest it as many times I want my retries.
(unless I want to surround it with try/catch)

是否有使用RXJava方法实现它的选项？

Is there an option to implement it with RXJava methods?

推荐答案

RxJava提供标准的重试运算符，让您重试多次，重试如果异常匹配谓词或具有一些复杂的重试逻辑。前两个使用是最简单的：

RxJava offers standard retry operators that let you retry a number of times, retry if the exception matches a predicate or have some complicated retry logic. The first two use are the simplest:

source.retry(5).subscribe(...)

source.retry(e -> e instanceof IOException).subscribe(...);

后者要求组装一个二级观察者，现在可以附加延迟，计数器等：

The latter one requires assembling a secondary observable which now can have delays, counters, etc. attached:

source.retryWhen(o -> o.delay(100, TimeUnit.MILLISECONDS)).subscribe(...)

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