Promise

A promise represents a future value (usually of an asynchronous operation).

This is a simple implementation of Promises/A+ in Java, based on RxJava's architecture.

Installation

Step 1. Add the JitPack repository to your build file

Add it in your root build.gradle at the end of repositories:

allprojects {
  repositories {
    ...
    maven { url 'https://jitpack.io' }
  }
}

Step 2. Add the dependency

dependencies {
  compile 'com.github.SMontiel:Promise:0.2.1'
}

Usage

Promise<String> p = Promise.resolve("Hello world");
p.then(new Consumer<String>() {
        @Override
        public void accept(String s) {
            System.out.println(s);
        }
    }).then(new Function<String, Integer>() {
        @Override
        public Integer apply(String s) {
            return s.length();
        }
    }).then(new Consumer<Integer>() {
        @Override
        public void accept(Integer integer) {
            System.out.println("Length of " + integer);
        }
    }).done();

Output:

Hello world!
Length of 12

Building

Building Promise with Gradle is fairly straight forward:

git clone https://github.com/SMontiel/Promise.git
cd Promise
./gradlew build

Bugs and Feedback

For bugs, questions and discussions please use the Github Issues.

Acknowledgements