code: @CheckReturnValue
      @BackpressureSupport(BackpressureKind.FULL)
      @SchedulerSupport(SchedulerSupport.NONE)
      public final Flowable<T> retry(BiPredicate<? super Integer, ? super Throwable> predicate) {
          ObjectHelper.requireNonNull(predicate, "predicate is null");
  
          return RxJavaPlugins.onAssembly(new FlowableRetryBiPredicate<T>(this, predicate));
      }
docs: Returns a Flowable that mirrors the source Publisher, resubscribing to it if it calls {@code onError}
  and the predicate returns true for that specific exception and retry count.
  <p>
  <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/retry.png" alt="">
  <dl>
  <dt><b>Backpressure:</b></dt>
  <dd>The operator honors downstream backpressure and expects the source {@code Publisher} to honor backpressure as well.
  If this expectation is violated, the operator <em>may</em> throw an {@code IllegalStateException}.</dd>
  <dt><b>Scheduler:</b></dt>
  <dd>{@code retry} does not operate by default on a particular {@link Scheduler}.</dd>
  </dl>
  
  @param predicate
  the predicate that determines if a resubscription may happen in case of a specific exception
  and retry count
  @return the source Publisher modified with retry logic
  @see #retry()
  @see <a href="http://reactivex.io/documentation/operators/retry.html">ReactiveX operators documentation: Retry</a>