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rxjava-android-example | FRP sample implementation for Android using RxJava | Reactive Programming library

 by   andrewhr Java Version: Current License: Apache-2.0

 by   andrewhr Java Version: Current License: Apache-2.0

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kandi X-RAY | rxjava-android-example Summary

rxjava-android-example is a Java library typically used in Programming Style, Reactive Programming applications. rxjava-android-example has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub.
A proof-of-concept implementation of [FRP](http://en.wikipedia.org/wiki/Functional_reactive_programming) in Android. It uses [RxJava](https://github.com/Netflix/RxJava) and some sugar to connect Android components to `Observable`s. The idea is to improve RxJava to be used like [ReactiveCocoa](https://github.com/ReactiveCocoa/ReactiveCocoa) is used for iOS/OS X. I intent to use this project as a laboratory for experimenting with APIs and implementation as still serve as some living example of the pattern applied to the Android world. Take a look into [ComposeMessageActivity](app/src/main/java/com/example/rx/ComposeMessageActivity.java) for more details.
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Support
Quality
Quality
Security
Security
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kandi-support Support

  • rxjava-android-example has a low active ecosystem.
  • It has 141 star(s) with 50 fork(s). There are 13 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 0 open issues and 1 have been closed. There are 1 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of rxjava-android-example is current.
This Library - Support
Best in #Reactive Programming
Average in #Reactive Programming
This Library - Support
Best in #Reactive Programming
Average in #Reactive Programming

quality kandi Quality

  • rxjava-android-example has 0 bugs and 0 code smells.
This Library - Quality
Best in #Reactive Programming
Average in #Reactive Programming
This Library - Quality
Best in #Reactive Programming
Average in #Reactive Programming

securitySecurity

  • rxjava-android-example has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • rxjava-android-example code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
This Library - Security
Best in #Reactive Programming
Average in #Reactive Programming
This Library - Security
Best in #Reactive Programming
Average in #Reactive Programming

license License

  • rxjava-android-example is licensed under the Apache-2.0 License. This license is Permissive.
  • Permissive licenses have the least restrictions, and you can use them in most projects.
This Library - License
Best in #Reactive Programming
Average in #Reactive Programming
This Library - License
Best in #Reactive Programming
Average in #Reactive Programming

buildReuse

  • rxjava-android-example releases are not available. You will need to build from source code and install.
  • Build file is available. You can build the component from source.
  • Installation instructions are not available. Examples and code snippets are available.
  • rxjava-android-example saves you 76 person hours of effort in developing the same functionality from scratch.
  • It has 197 lines of code, 18 functions and 10 files.
  • It has low code complexity. Code complexity directly impacts maintainability of the code.
This Library - Reuse
Best in #Reactive Programming
Average in #Reactive Programming
This Library - Reuse
Best in #Reactive Programming
Average in #Reactive Programming
Top functions reviewed by kandi - BETA

kandi has reviewed rxjava-android-example and discovered the below as its top functions. This is intended to give you an instant insight into rxjava-android-example implemented functionality, and help decide if they suit your requirements.

  • Initializes the view .
  • Creates an observable object which allows to adapt the text of the text in a TextView .
  • Creates and returns an observable which subscribes to the item at the next item in the list view .
  • Binds a View to the View
  • Creates a enabled property from the specified View .
  • Create a TextProperty from a TextView
  • Creates a data set property .

rxjava-android-example Key Features

FRP sample implementation for Android using RxJava

Community Discussions

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  • Changing the target of a `whenever` block from the inside
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Trending Discussions on Reactive Programming

QUESTION

How to use RXJS to share a pool of resources between multiple consumers

Asked 2022-Mar-31 at 12:55

How can we divide work of consumers over a limited set of resources in RXJS?

I have a Pool class here (simplified):

class Pool<TResource> {

  private readonly resource$: Observable<TResource>;

  constructor(resource$: Observable<TResource>) {
    this.resource$ = resource$.pipe(
      // We use share replay here, so multiple calls to `schedule` will share the resources
      shareReplay()
    );
  }

  /**
   * Schedules a task to be executed on resources in the pool. Each input is paired with a resource, which allows async work to be done.
   * @param input$ The inputs to pair up with a resource.
   * @param task The task to execute on each resource
   */
  public schedule<TIn, TOut>(input$: Observable<TIn>, task: (resource: TResource, input: TIn) => Promise<TOut> | TOut): Observable<TOut> {
    const recycleBin = new Subject<TResource>();
    const resource$ = merge(recycleBin, this.resource$);

    return zip(resource$, input$).pipe(
      mergeMap(async ([resource, input]) => {
        const output = await task(resource, input);
        //  Recycles a resource so its re-emitted from the `resource$` observable.
        recycleBin.next(resource);
        return output;
      }),
      tap({ complete: () => recycleBin.complete() })
    );
  }
}

You can use it like this:

class CalculatorResource {
  expensiveCalculation(n: number) {
    return new Promise<number>(res => setTimeout(() => res(n*2), 1000));
  }
}

const pool = new Pool(of(new CalculatorResource(), new CalculatorResource()));
const input$ = of(1, 2, 3, 4);
const output$ = pool.schedule(input$, (calc, n) => calc.expensiveCalculation(n));
output$.subscribe(console.log)
// ...wait 1 sec
// Logs 2
// Logs 4
// ...wait 1 sec
// Logs 6
// Logs 8

This works as expected.

However, when we call schedule in parallel, the resources will also be distributed in parallel. This is not good, we want the resources to be distributed evenly, since the nature of the tasks they do make it so they can't be called in parallel.

const pool = new Pool(of(new CalculatorResource(), new CalculatorResource()));
const input$ = of(1, 2, 3, 4);
const parallelInput$ = of(5, 6, 7, 8);
pool.schedule(input$, (calc, n) =>
  calc.expensiveCalculation(n)
).subscribe(console.log);
pool.schedule(parallelInput$, (calc, n) =>
  calc.expensiveCalculation(n)
).subscribe(console.log);
// Actual output:

// ...wait 1 sec
// Logs 2
// Logs 4
// Logs 10
// Logs 12
// ...wait 1 sec
// Logs 6
// Logs 8
// Logs 14
// Logs 16

// What i would like to see:
// ...wait 1 sec
// Logs 2
// Logs 4
// ...wait 1 sec
// Logs 10
// Logs 12
// ...wait 1 sec
// Logs 6
// Logs 8
// ...wait 1 sec
// Logs 14
// Logs 16

ANSWER

Answered 2022-Mar-31 at 12:55

So the main thing is you need to share the actual part that does the work, not only the resources.

Here's a solution from me:

https://stackblitz.com/edit/rxjs-yyxjh2?devToolsHeight=100&file=index.ts

import { merge, Observable, Observer, of, Subject, zip } from 'rxjs';
import { ignoreElements, concatMap, switchMap } from 'rxjs/operators';

class Pool<TResource> {
  private readonly resourceFree$ = new Subject<TResource>();
  private readonly dispatcher$ = new Subject<{
    execute: (resource: TResource) => any;
    observer: Observer<any>;
  }>();
  private freeResources$ = merge(this.resource$, this.resourceFree$);
  readonly doWork$ = zip(this.freeResources$, this.dispatcher$).pipe(
    switchMap(async ([resource, work]) => {
      try {
        const result = await work.execute(resource);
        work.observer.next(result);
        work.observer.complete();
      } catch (err) {
        work.observer.error(err);
      }
      this.resourceFree$.next(resource);
    }),
    ignoreElements()
  );

  constructor(private resource$: Observable<TResource>) {}

  public schedule<TIn, TOut>(
    input$: Observable<TIn>,
    task: (resource: TResource, input: TIn) => Promise<TOut> | TOut
  ): Observable<TOut> {
    return input$.pipe(
      //you can use mergeMap here as well, depends on how fast you want to consume inputs
      concatMap((input) => {
        const work = {
          execute: (r) => task(r, input),
          observer: new Subject<TOut>(),
        };
        this.dispatcher$.next(work);
        return work.observer;
      })
    );
  }
}

class CalculatorResource {
  expensiveCalculation(n: number) {
    return new Promise<number>((res) => setTimeout(() => res(n * 2), 1000));
  }
}

const pool = new Pool(of(new CalculatorResource(), new CalculatorResource()));
pool.doWork$.subscribe(); //this is to start the pool dispatcher

const input$ = of(1, 2, 3, 4);
const parallelInput$ = of(5, 6, 7, 8);
pool
  .schedule(input$, (calc, n) => calc.expensiveCalculation(n))
  .subscribe(console.log, undefined, () => console.log('1st done'));
pool
  .schedule(parallelInput$, (calc, n) => calc.expensiveCalculation(n))
  .subscribe(console.log, undefined, () => console.log('2nd done'));

setTimeout(() => {
  pool
    .schedule(parallelInput$, (calc, n) => calc.expensiveCalculation(n))
    .subscribe(console.log, undefined, () => console.log('3rd done'));
}, 5000);

Source https://stackoverflow.com/questions/71689376

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install rxjava-android-example

You can download it from GitHub.
You can use rxjava-android-example like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the rxjava-android-example component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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