reactive-programming

问题 I'm using RxJS here and I can't seem to get over this seemingly simple issue. rx.Observable .from([1,2,3,54,3,22,323,23,11,2]) .distinct() .subscribe(function next (x) { console.log('Next'); console.log(x); }, function error (x) { console.log('Error'); console.log(x); }, function completed () { console.log('Completed'); }); The above code spits out each array item in order as expected. rx.Observable .fromPromise(getNumbers([1,2,3,54,3,22,323,23,11,2])) .distinct() .subscribe(function next (x)

问题 I've got a very simple class that I am using to poll a directory for new files. It's got the location, a time to start monitoring that location, and an interval (in hours) for when to check again: public class Thing { public string Name {get; set;} public Uri Uri { get; set;} public DateTimeOffset StartTime {get; set;} public double Interval {get; set;} } I am new to Reactive Extensions, but I think it is exactly the right tool for the job here. At the start time, and on every subsequent

问题 Consider this presentation of Joe Cheng were he explains how he and his colleagues implemented the reactive framework in shiny (which is inspired by Meteor): Actual question Could someone explain to me how I would go about finding out about a reactive object's dependencies (i.e. listing their names and environments, actually accessing them, etc.) that have been automatically inferred by shiny::reactive() ? More specifically, I'd like to use that information in my custom "one-stop-shop"

问题 I am trying to get this reactive to return a data frame that I can manipulate with plotly. avghour <- reactive({ result <- data.frame() start_date <- as.numeric(unlist(input$i6[1])) end_date <- as.numeric(unlist(input$i6[2])) mkw <- maxkwpeakdates[(maxkwpeakdates >= start_date & maxkwpeakdates <= end_date) & !is.na(maxkwpeakdates), ] mkw <- na.omit(mkw) mopkw <- maxonpeakkwdates[(maxonpeakkwdates >= x & maxonpeakkwdates <= y) & !is.na(maxonpeakkwdates), ] mopkw <- na.omit(mopkw) mkwhour <-

问题 I am trying to get this reactive to return a data frame that I can manipulate with plotly. avghour <- reactive({ result <- data.frame() start_date <- as.numeric(unlist(input$i6[1])) end_date <- as.numeric(unlist(input$i6[2])) mkw <- maxkwpeakdates[(maxkwpeakdates >= start_date & maxkwpeakdates <= end_date) & !is.na(maxkwpeakdates), ] mkw <- na.omit(mkw) mopkw <- maxonpeakkwdates[(maxonpeakkwdates >= x & maxonpeakkwdates <= y) & !is.na(maxonpeakkwdates), ] mopkw <- na.omit(mopkw) mkwhour <-

问题 I have an observable that represents an action that is triggered by some outside component. For the purpose of this question, let's call it createBananaAction . I have a bananaService with a method create that performs an AJAX request and returns the created banana as a Promise . So, whenever some data arrives from the createBananaAction , we want to call bananaService.create() . The code looks like this: (using RxJs) this.createdBananas = createBananaAction.flatMap(() => bananaService.create

问题 I have an observable that represents an action that is triggered by some outside component. For the purpose of this question, let's call it createBananaAction . I have a bananaService with a method create that performs an AJAX request and returns the created banana as a Promise . So, whenever some data arrives from the createBananaAction , we want to call bananaService.create() . The code looks like this: (using RxJs) this.createdBananas = createBananaAction.flatMap(() => bananaService.create

问题 ReactiveCocoa can convert the signal to "hot" signal by calling its -subscribeCompleted: . But I think this method is quite verbose if you do not care about the result (i.e. no subscribers). RACDisposable *animationDisposable = [[self play:animation] subscribeCompleted:^{ // just to make the animation play }]; And these 3 lines are not expressive enough to show my intention. Is there any method for similar purpose? Thanks! 回答1: I want to do nothing except making it hot (=make it run once).

问题 I have a paginated response from an URL, I want to keep on hitting the next page URL which I get from the previous response and keep on collecting items till I don't have a "nextPage" URL in my response. How to achieve this in a reactive way using spring boot WebClient from WebFlux with out blocking? Request1: GET /items response: { items: [...] nextPage: "/items?page=2" } Request2: GET /items?page=2 response: { items: [...] nextPage: "/items?page=3" } Request3: GET /items?page=3 response: {

问题 I have been using Event Bus in my apps (i.e: greenrobot/EventBus). But I find some disadvantages in using Event Bus: Chaining tasks execution is difficult A lot of classes to represent events Less clear code (well, it's still possible to trace, but not as clear) I have been researching for new techniques to deal with this problem. And I read quite a bit about RxJava and wonder if it could be a solution. So my questions about RxJava (based on what I have read recently): Could RxJava observer