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RxJava 2 Getting Started: serially execute tasks. `andThen` or `defer`?


RxJava 2 Getting Started: serially execute tasks. `andThen` or `defer`?

By : las86730
Date : October 17 2020, 03:08 PM
I wish this helpful for you The parallel execution happens because your simulateCompletable starts the tasks before the Completables are even created. You could use a delayed Completable directly:
code :
Completable.fromAction(() -> System.out.println("First"))
    .delay(1, TimeUnit.SECONDS)
    .andThen(Completable.fromAction(() -> System.out.println("Second")))
    .blockingAwait();
Completable c = simulateCompletable(es, "step 1", 1000)
            .defer(() -> simulateCompletable(es, "step 2", 500));


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Recommended way to execute async tasks with RXJava

Recommended way to execute async tasks with RXJava


By : Ahmed
Date : March 29 2020, 07:55 AM
Using defer module in python to execute a bunch of tasks async

Using defer module in python to execute a bunch of tasks async


By : Vitalis
Date : March 29 2020, 07:55 AM
This might help you No, using asynchronous programming (cooperative routines, aka coroutines), will not help your use case. Async is great for I/O intensive workloads, or anything else that has to wait for slower, external events to fire.
Coroutines work because they give up control (yield) to other coroutines whenever they have to wait for something (usually for some I/O to take place). If they do this frequently, the event loop can alternate between loads of coroutines, often far more than what threading could achieve, with a simpler programming model (no need to lock data structures all the time).
RxJava `Completable.andThen` is not executing serially?

RxJava `Completable.andThen` is not executing serially?


By : Offer Hakimi
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The issue is not with andThen but with the statement Observable.just(mUser.name) inside andThen . The just operator will try to create the observable immediately though it will emit only after Completable.fromAction.
Problem here is , while trying to create the Observable using just , the mUser is null.
code :
 andThen(Observable.defer(() -> Observable.just(mUser.name)));
 andThen(Observable.fromCallable(() -> mUser.name));
Execute parallel tasks with RxJava and wait until the last one of them is completed

Execute parallel tasks with RxJava and wait until the last one of them is completed


By : haripandey
Date : March 29 2020, 07:55 AM
To fix this issue Have you tried using zip?
code :
public void parallelExecution(List<Integer> calls) {

    logger.debug("Starting parallel executions");

    // Create an iterable observables
    List<Observable<Integer>> observables = calls.stream()
            .map(i -> {
                return Observable.fromCallable(() -> simpleAsync(i))
                        .subscribeOn(Schedulers.newThread());
            })
            .collect(Collectors.toList());


    Observable.zip(observables, objects -> { // Zip observables
                return Arrays.stream(objects)
                        .map(Object::toString)
                        .collect(Collectors.toList());
            })
            .doOnNext(results -> logger.debug("Ending parallel executions"))
            .subscribe(results -> { // Subscribe to the result.
                // Put your code that needs to "wait"
                for (String x : results) {
                    logger.debug("Results: {}", x);
                }
            });
}
Starting parallel executions
Pre log RxNewThreadScheduler-3: 9
Pre log RxNewThreadScheduler-1: 1
Pre log RxNewThreadScheduler-2: 4
Pre log RxNewThreadScheduler-4: 16
Pre log RxNewThreadScheduler-5: 25
Post log RxNewThreadScheduler-1: 1
Post log RxNewThreadScheduler-2: 4
Post log RxNewThreadScheduler-3: 9
Post log RxNewThreadScheduler-4: 16
Post log RxNewThreadScheduler-5: 25
Ending parallel executions
Results: 1
Results: 4
Results: 9
Results: 16
Results: 25
final BlockingQueue<Runnable> tasks = new LinkedBlockingQueue<>();
logger.debug("Starting parallel executions");

// Create an iterable observables
List<Observable<Integer>> observables = calls.stream()
        .map(i -> {
            return Observable.fromCallable(() -> simpleAsync(i))
                    .subscribeOn(Schedulers.newThread());
        })
        .collect(Collectors.toList());


Observable.zip(observables, objects -> { // Zip observables
            return Arrays.stream(objects)
                    .map(Object::toString)
                    .collect(Collectors.toList());
        })
        .doOnNext(results -> logger.debug("Ending parallel executions"))
        .observeOn(Schedulers.from(tasks::add)) // Add a scheduler with executor from the current thread
        .subscribe(results -> { // Subscribe to the result.
            // Put your code that needs to "wait"
            for (String x : results) {
                logger.debug("Results: {}", x);
            }
        });

try {
    tasks.take().run();
} catch (InterruptedException e) {
    e.printStackTrace();
}
Using RxJava how can I execute asynchronous tasks with multiple dependencies

Using RxJava how can I execute asynchronous tasks with multiple dependencies


By : Elgardo Echevarria
Date : March 29 2020, 07:55 AM
To fix the issue you can do You can use concat() and merge() operators to achieve this.
Here is how it can be done :
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