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The sequence was indeed terminated by the error. There is another operator of interest with regards to error handling, and you might be tempted to use it in the case described in the previous section. The thing to keep in mind is that it works by re-subscribing to the upstream Flux. This is really a different sequence, and the original one is still terminated. Sumatriptan Succinate Injection (Imitrex Injection)- FDA verify that, we can re-use the previous example and append a retry(1) to retry once instead of using onErrorReturn.

The following example shows how to do sl:Flux. The preceding example produces the following output:259,tick 0 249,tick 1 251,tick 2 506,tick 0 (1) 248,tick 1 253,tick 2 java.

RuntimeException: boom 1 A new interval started, from tick 0. The additional 250ms duration is coming from the 4th tick, the one that causes the exception and subsequent retry.

As you can see from the preceding example, retry(1) merely re-subscribed to the original interval once, restarting the Sumatriptan Succinate Injection (Imitrex Injection)- FDA from 0. The second time around, since the exception still occurs, it gives up and propagates the error downstream.

This companion Flux is created by the operator but decorated by the user, in order to customize the retry condition. The Retry class is an abstract class, but it offers a factory method if you want to transform the companion with a simple lambda (Retry. The RetrySignal gives Sumatriptan Succinate Injection (Imitrex Injection)- FDA to the error as well as metadata around it. If the companion Flux completes, the error is swallowed, Tecentriq (Atezolizumab Injection)- FDA retry cycle stops, and the resulting sequence last 7, too.

If the companion Flux produces an error (e), the retry cycle stops and the resulting sequence errors with Sumatriptan Succinate Injection (Imitrex Injection)- FDA. The distinction between the previous two cases is important. Simply completing the companion would effectively swallow an error. In effect, the preceding example results in an empty Flux, but it completes successfully. Since retry(3) on the same Flux would have terminated with the latest error, this retryWhen example is not exactly the same as a retry(3).

One can use the builders exposed in Retry to achieve the same in a more fluent manner, as well as more finely tuned retry strategies. The core-provided Retry helpers, RetrySpec and RetryBackoffSpec, both allow advanced customizations like:triggering a side effect like logging around the retry trigger (ie for backoff before and after the delay), provided the retry is validated (doBeforeRetry() and doAfterRetry() are additive)triggering an asynchronous Mono around the retry trigger, which allows to add asynchronous behavior on top of the base delay but thus further delay the trigger (doBeforeRetryAsync and doAfterRetryAsync are additive)customizing the exception in case the maximum number of attempts has been reached, through onRetryExhaustedThrow(BiFunction).

In the case of exponential backoff strategy, this also means that the next attempt will be back to using the minimum Duration backoff instead of a longer one.

This can be especially useful for long-lived sources that see sporadic bursts of errors (or transient errors), where each burst should be retried with its own backoff. It will successfully complete when the counter reaches 10. Without the transientErrors(true), the configured maximum attempt of 2 would be reached by the second burst and the Sumatriptan Succinate Injection (Imitrex Injection)- FDA would fail after having emitted onNext(3).

In general, all operators can themselves contain code that potentially trigger an exception or calls to a user-defined callback that can similarly fail, so they all contain some form of error handling. As a rule of thumb, an unchecked exception is always propagated through onError.

IllegalArgumentException: foo You can tune the Exception before it is passed to onError, through the use of a hook. Reactor, however, defines a set of exceptions (such as OutOfMemoryError) that are always deemed to be fatal.

These errors mean that Reactor cannot keep operating and are thrown rather than propagated. If, for example, you need to call some method that declares it throws exceptions, you still have to deal with Sumatriptan Succinate Injection (Imitrex Injection)- FDA exceptions in a try-catch block. You have several options, though:Catch the exception, wrap it into an unchecked exception, and then throw it (interrupting the sequence).

The Exceptions utility class can help you with that (we get to that next). If you need to return a Flux (for example, you are in a flatMap), wrap the exception in an error-producing Flux, as follows: return Flux. It also calls throwIfFatal first and does not wrap RuntimeException. The following example shows how to do so:converted. Processors and Sinks Processors are a special kind of Publisher that are also a Subscriber. They were originally intended as a possible representation of an intermediate step that could then be shared between Sumatriptan Succinate Injection (Imitrex Injection)- FDA Streams implementations.

In Reactor however, such steps are rather represented by operators that are Publisher. A common mistake when coming across a Processor for the first time is the temptation to directly call the exposed onNext, onComplete and onError methods from the Subscriber interface.

Such manual calls should be made with care, especially regarding external synchronization of calls with respect to the Reactive Streams specification. Processors are actually probably marginally useful, unless one comes across a Reactive Streams based API that requires a Subscriber to be passed, rather than exposing a Publisher. Sinks are usually a better alternative. In Reactor a sink is a class that allows safe manual triggering of signals.

It can either be associated to a subscription (from inside an operator) or completely standalone. Users have time until 3.



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