execute and return value from observable on retry predicate

Question

perform a task with an observable and emit value

private val performTask = io.reactivex.Observable.create<Boolean>({ emitter ->
// do somethinf
    emitter.onNext(true)
    emitter.onComplete()
})

// this is also another observable with retry. I want to retry 2 times, but only if perform task is successful.

fun <T> io.reactivex.Observable<T>.retryAuth(): Observable<T> {
    return this.retry ({ count, error -> 
        if (count == 2 && error is ApolloException) {
            // do something with performTask and return the value

        } else false
    })

just need illustration on achieving this

For normally completing flows, use `repeat(2)` for numbered or `repeat(BooleanSupplier)` for conditional retries. — akarnokd, Jan 20 '18 at 13:25
repeat executes onComplete. but this execution is based on error. @akarnokd — Belvi Nosakhare, Jan 20 '18 at 14:21

score 1 · Accepted Answer · answered Jan 20 '18 at 15:23

1

You could use retryWhen:

this.retryWhen({ errors ->
   val counter = AtomicInteger()
   .flatMap({ error ->
       if (counter.incrementAndGet() <= 2 && error is ApolloException) {
           return performTask
              .flatMap({ result ->
                   if (result) {
                       return Observable.just(true)
                   }
                   return Observable.error(error)
              })
       }
       return Observable.error(error)
   })  
})

answered Jan 20 '18 at 15:23

akarnokd

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I didn't know one could do the counter thing. Any recommeded resource to help brush up my level of competence on rx ? – Belvi Nosakhare Jan 20 '18 at 16:18
Read any of the RxJava books. – akarnokd Jan 20 '18 at 16:39

execute and return value from observable on retry predicate

1 Answers1