reactive-programming

问题 I am working with a framework that calls a function I implement. I would like the parameter of this function to be converted to an Observable, and sent through a sequence of Observers. I thought I could use a Subject for this, but it isn't behaving as I expected. To clarify, I have something like the following code. I thought Option 1 below would work, but so far I am settling for Option 2 , which doesn't seem idiomatic at all. var eventSubject = new Rx.Subject(); var resultSource =

问题 I am trying to write a simple program using RxJava to generate an infinite sequence of natural numbers. So, far I have found two ways to generate sequence of numbers using Observable.timer() and Observable.interval() . I am not sure if these functions are the right way to approach this problem. I was expecting a simple function like one we have in Java 8 to generate infinite natural numbers. IntStream.iterate(1, value -> value +1).forEach(System.out::println); I tried using IntStream with

问题 I would like to implement a certain type of throttling of events in reactive-banana. It should work such that an event is not let through if arrives at less then delta seconds from the last event that passed through. If it is not let through then it is stored and is fired after delta seconds from the last fired event. Below is a program that implements this for lists of time stamped numbers. Would it be possible to translate this to reactive-banana ? Also, in reactive-banana how do I fire an

问题 Let's say I have two classes, where you can observe over some observables. First example, with public subject: class EventsPub { public readonly onEnd = new Subject<void>(); } Second example, with private subject and registering method: class EventsPriv { private readonly endEvent = new Subject<void>(); public onEnd(cb: () => void): Subscription { return this.endEvent.subscribe(cb); } } The first example is somehow unsafe because anyone can call eventsPub.endEvent.next() from outside the

问题 I am trying to filter the list on the basis of it's property. For example, Sensors class has a property isActive and I want to get all the objects with isActive as true but I am unable to do it. I tried different ways but I didn't find the solution. Can someone help me to do it? Here is my code: mCompositeDisposable.add( fcService.getStationList() .subscribeOn(Schedulers.io()) .flatMap( stations -> { return fcService.getSensorList(stations.get(0).getName().getOriginal()); }) .subscribe(this:

问题 Interested in reactive programming, I played a bit with the Building a Reactive RESTful Web Service guide. And wanted to move forwrad and add some unit tests. I tried to test my handler ( RouterFunction ) with plain Junit/Mockito test. But, because it is reactive, the handler returns a Mono<ServerResponse> . So I had to block() it to test the ServerResponse status but was not able to extract his body to test it. While searching the web for a solution, it seems that all the samples are using

问题 I want to get string value from Observable and return the value from the function to the caller function. For eg: I have array of keys and would like to fetch the value (string) of all key one by one and display it html component which has menu bar. Here are the ts files: key-list.component.ts public data = [ { 'key': 1, 'value' : this.getValue(1)}, { 'key': 2, 'value' : this.getValue(2)}, ... ]; private getValue(key: number): string { return this.keyService.find(key).subscribe(response => {

问题 This is related to my other question here. James World presented a solution as follows: // idStream is an IObservable<int> of the input stream of IDs // alarmInterval is a Func<int, TimeSpan> that gets the interval given the ID var idAlarmStream = idStream .GroupByUntil(key => key, grp => grp.Throttle(alarmInterval(grp.Key))) .SelectMany(grp => grp.IgnoreElements().Concat(Observable.Return(grp.Key))); <edit 2: Question: How do I start the timers immediately without waiting for the first

问题 I am using Reactive-Banana in a WX interface. I need to retrieve a value from an external service API when a button is pressed. I have a generic Behavior based on the data type AppState that “accums” the transformed changes based on a function transformation ( doSomeTransformation ). The values that get transformed are transported by the events and they come from a remote API ( getRemoteValue ) when a button on the interface is pressed. I have written a slim version of the code that

问题 Does there exist something equivalent to the async pipe that I could use inside a component like this @Component({ selector: 'my-component', }) export class myComponent { myObservable$: Observable<string>; method() { doSomething(this.myObservable$); // here I would like to access directly the current string value of // myObservable$ without having to subscribe } } 回答1: You have to ask yourself: What do you want to achieve by avoiding the subscribe() call? My guess is that you want to prevent