reactive-programming

问题 CompletableFuture executes a task on a separate thread ( uses a thread-pool ) and provides a callback function. Let's say I have an API call in a CompletableFuture . Is that an API call blocking? Would the thread be blocked till it does not get a response from the API? ( I know main thread/tomcat thread will be non-blocking, but what about the thread on which CompletableFuture task is executing? ) Mono is completely non-blocking, as far as I know. Please shed some light on this and correct me

问题 Lets suppose these two scenarios of a controller that generates some random numbers with a delay: 1) Reactive Spring 5 reactive application: @GetMapping("/randomNumbers") public Flux<Double> getReactiveRandomNumbers() { return generateRandomNumbers(10, 500); } /** * Non-blocking randon number generator * @param amount - # of numbers to generate * @param delay - delay between each number generation in milliseconds * @return */ public Flux<Double> generateRandomNumbers(int amount, int delay){

问题 I have been researching FRP and found a bunch of different implementations. One model I have seen is one I will refer to as the 'Signal' representation. This essential combines Events and Behaviours into one entity. Firstly, a Signal is an object thats value is a Behaviour. Secondly, a Signal has an Event 'stream' that can be seen and operated on as a standard data structure (you can use 'each', 'map' and 'filter' etc on the Signal to define how Events are reacted to). For example I can do

问题 What are the pros/cons between using Deps.autorun or Collection.observe to keep a third-party widget in sync with a reactive Meteor.Collection . For example, I am using jsTree to visually show a directory tree that I have stored in my MongoDB. I'm using this code to make it reactive: // automatically reload the fileTree if the data changes FileTree.find().observeChanges({ added: function() { $.jstree.reference('#fileTree').refresh(); }, changed: function() { $.jstree.reference('#fileTree')

问题 I want to add a like range component. But one that is actually circular and i have no idea how to do it. Can you point me to some help please. Te example of what i want: 回答1: I've been working with react-native-svg lately and I think it is fantastic - SVG and React are a match made in geek-heaven, just perfect for creating custom UI's with no need to drop down to native drawing code. Here's a little CircularSlider component that implements what you described above: import React,{Component}

问题 .NET 4.0 beta 2 has introduced the IObservable and IObserver interfaces. What are the advantages compared to classic .NET events? Doesn't this solve the same problem? 回答1: You can use IObservable as an event, replacing code that exposes events with properties of type IObservable, but that's not really the point. There are two important things to understand about IObservable: It unifies two concepts that we didn't know how to unify before : asynchronous operations (which typically return a

问题 I'm using ReactiveCocoa to update a UILabel whilst a UIProgressView counts down: NSInteger percentRemaining = ...; self.progressView.progress = percentRemaining / 100.0; __block NSInteger count = [self.count]; [[[RACSignal interval:0.05 onScheduler:[RACScheduler mainThreadScheduler]] take: percentRemaining] subscribeNext:^(id x) { count++; self.countLabel.text = [NSString stringWithFormat:@"%d", count]; self.progressView.progress = self.progressView.progress - 0.01; } completed:^{ // Move

问题 I am using RxJava to process some notifications that we pull from a queue. RxJava seemed to work fine with a simple workflow, now with new requirements coming in, the flow is growing in complexity with more branches (please see below picture as a reference) I tried to exemplify the flow with a small unit test: @Test public void test() { Observable.range(1, 100) .groupBy(n -> n % 3) .toMap(GroupedObservable::getKey) .flatMap(m1 -> { Observable<Integer> ones1 = m1.get(0); Observable<Integer>

问题 I am pretty new to React-Native. I install react-native on my Mac using the code below: npm install react-native -g react-native-cli I got the error: npm ERR! code MODULE_NOT_FOUND npm Err! Cannot find module 'minizlib' Anyone can help me to solve this problem please? 回答1: I had the same problem npm i minizlib --global This helped me 回答2: New to this myself as a disclaimer but you may want to try uninstalling node. If you installed node with Homebrew try... $ brew uninstall node $ brew

问题 Reading How to use RxJs distinctUntilChanged? and this, it seems that distinctUntilChanged alters the output stream to only provide distinct contiguous values . I take that to mean that if the same value arrives in immediate succession, you are essentially filtering the stream and only getting one occurrence of that repeated value. So if I write this: this.myFormControl.valueChanges .debounceTime(1000) .distinctUntilChanged() .subscribe(newValue => { console.log('debounced: ', newValue); });