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vertx-gradle-template | Vert.x 2.x is * * deprecated * * - use | Reactive Programming library

 by   vert-x Java Version: Current License: Non-SPDX

 by   vert-x Java Version: Current License: Non-SPDX

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kandi X-RAY | vertx-gradle-template Summary

vertx-gradle-template is a Java library typically used in Programming Style, Reactive Programming applications. vertx-gradle-template has no bugs, it has no vulnerabilities, it has build file available and it has low support. However vertx-gradle-template has a Non-SPDX License. You can download it from GitHub.
Vert.x 2.x is **deprecated** - use instead
Support
Support
Quality
Quality
Security
Security
License
License
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kandi-support Support

  • vertx-gradle-template has a low active ecosystem.
  • It has 83 star(s) with 98 fork(s). There are 14 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 7 open issues and 15 have been closed. On average issues are closed in 76 days. There are 4 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of vertx-gradle-template is current.
This Library - Support
Best in #Reactive Programming
Average in #Reactive Programming
This Library - Support
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quality kandi Quality

  • vertx-gradle-template 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

  • vertx-gradle-template has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • vertx-gradle-template 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

  • vertx-gradle-template has a Non-SPDX License.
  • Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.
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This Library - License
Best in #Reactive Programming
Average in #Reactive Programming

buildReuse

  • vertx-gradle-template 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.
  • vertx-gradle-template saves you 113 person hours of effort in developing the same functionality from scratch.
  • It has 286 lines of code, 31 functions and 19 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
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Top functions reviewed by kandi - BETA

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

  • Starts ping handler .

    Get all kandi verified functions for this library.

    Get all kandi verified functions for this library.

    vertx-gradle-template Key Features

    Vert.x 2.x is **deprecated** - use instead

    vertx-gradle-template Examples and Code Snippets

    No Code Snippets are available at this moment for vertx-gradle-template.

    See all Code Snippets related to Reactive Programming

    Community Discussions

    Trending Discussions on Reactive Programming
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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 vertx-gradle-template

    You can download it from GitHub.
    You can use vertx-gradle-template 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 vertx-gradle-template 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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