promise_playground.js

"use strict";
var Promise = require('bluebird');
class ChainThing {
    constructor(param1, param2) {
        this.time = param1;
        this.message = param2;
    }
    step1() {
        console.log('['+this.message+'] STEP 1 ');
        return new Promise((resolve, reject) => {
            setInterval(function() {
                var err = '';
                if (err) {
                    return reject(err)
                } else {
                    return resolve();
                }
            }, this.time);
        })
    }

    step2() {
        console.log('['+this.message+'] STEP 2 ');
        return new Promise((resolve, reject) => {
            setInterval(function() {
                var err = '';
                if (err) {
                    return reject(err)
                } else {
                    return resolve('Async data result');
                }
            }, this.time);
        })
    }

    step3(param) {
        console.log('['+this.message+'] STEP 3 ');
        console.log('['+this.message+'] ' + param);
        return new Promise((resolve, reject) => {
            setInterval(function() {
                var err = '';
                if (err) {
                    return reject(err)
                } else {
                    return resolve();
                }
            }, this.time);
        })
    }

    logAsCompleted() {
        console.log('['+this.message+'] THE END ');
        return new Promise((resolve, reject) => {
            return resolve();
        });
    } 

}

var p1 = new ChainThing(1000, 'v1');
p1.step1().then(p1.step1.bind(p1))
          .then(p1.step2.bind(p1))
          .then(p1.step3.bind(p1))
          .then(p1.logAsCompleted.bind(p1));
var p2 = new ChainThing(1200, 'v3');
p2.step1().then(p2.step1.bind(p2))
          .then(p2.step2.bind(p2))
          .then(p2.step3.bind(p2))
          .then(p2.logAsCompleted.bind(p2));

var p3 = new ChainThing(2000, 'v3');
p3.step1().then(p3.step1.bind(p3))
          .then(p3.step2.bind(p3))
          .then(p3.step3.bind(p3))
          .then(p3.logAsCompleted.bind(p3));