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Last active November 29, 2018 07:21
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JS Binpromise bin fun// source https://jsbin.com/jivusuz
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta name="description" content="promise bin fun">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<script id="jsbin-javascript">
// return a promise resolving (or rejecting) in *time*
const delay = (() => {
let counter = 0; // incremental job id
let progress = {}; // keeps job ids that are being resolved
return (time) => {
counter++;
// job start
console.log('BEING PROCESSED: ' + Object.keys(progress).length);
console.log(`+ ${counter} START job`);
progress[counter] = true;
return new Promise((resolve, reject) => {
setTimeout(((i) => {
// job stop
console.log(`- ${i} END job`)
delete progress[i];
const threshold = 1 // should it resolve or not?
if (Math.random() <= threshold) return resolve(i) // yes
else return reject(i); // no
}).bind(this, counter), time || Math.random() * 2000); // wait 0-2000ms
});
};
})();
// return an array of jobs
const jobs = (number) => {
return [...Array(number).keys()].map(() => delay);
}
// write a class that throttles the concurrency and responds
// to the following interface
class Deferred {
constructor() {
this.promise = new Promise((resolve, reject)=> {
this.reject = reject
this.resolve = resolve
})
}
}
class Queue{
constructor({concurrency}) {
this.concurrency = concurrency;
this.jobs = [];
this.endCounter = 0;
this.dfd= new Deferred();
}
add(...incomingJobs) {
this.endCounter = incomingJobs.length;
this.jobs = incomingJobs;
}
runNextJob() {
const job = this.jobs.shift();
if (!job) {
return;
}
this.executeJob(job)
};
executeJob(job) {
job()
.then(val => {
this.runNextJob();
this.endCounter--;
if (this.endCounter === 0) {
this.dfd.resolve();
}
})
.catch(err => console.log(Error('Job execution failed')));
}
get onFinish() {
return this.dfd.promise;
}
start () {
for(let i=0;i<this.concurrency;i++){
const job = this.jobs.shift();
if (!job) {
return;
}
this.executeJob(job)
}
}
}
let queue = new Queue({concurrency: 10})
queue.add(...jobs(3));
queue.onFinish.then(() => console.log('Aloha!'));
queue.start();
</script>
<script id="jsbin-source-javascript" type="text/javascript">// return a promise resolving (or rejecting) in *time*
const delay = (() => {
let counter = 0; // incremental job id
let progress = {}; // keeps job ids that are being resolved
return (time) => {
counter++;
// job start
console.log('BEING PROCESSED: ' + Object.keys(progress).length);
console.log(`+ ${counter} START job`);
progress[counter] = true;
return new Promise((resolve, reject) => {
setTimeout(((i) => {
// job stop
console.log(`- ${i} END job`)
delete progress[i];
const threshold = 1 // should it resolve or not?
if (Math.random() <= threshold) return resolve(i) // yes
else return reject(i); // no
}).bind(this, counter), time || Math.random() * 2000); // wait 0-2000ms
});
};
})();
// return an array of jobs
const jobs = (number) => {
return [...Array(number).keys()].map(() => delay);
}
// write a class that throttles the concurrency and responds
// to the following interface
class Deferred {
constructor() {
this.promise = new Promise((resolve, reject)=> {
this.reject = reject
this.resolve = resolve
})
}
}
class Queue{
constructor({concurrency}) {
this.concurrency = concurrency;
this.jobs = [];
this.endCounter = 0;
this.dfd= new Deferred();
}
add(...incomingJobs) {
this.endCounter = incomingJobs.length;
this.jobs = incomingJobs;
}
runNextJob() {
const job = this.jobs.shift();
if (!job) {
return;
}
this.executeJob(job)
};
executeJob(job) {
job()
.then(val => {
this.runNextJob();
this.endCounter--;
if (this.endCounter === 0) {
this.dfd.resolve();
}
})
.catch(err => console.log(Error('Job execution failed')));
}
get onFinish() {
return this.dfd.promise;
}
start () {
for(let i=0;i<this.concurrency;i++){
const job = this.jobs.shift();
if (!job) {
return;
}
this.executeJob(job)
}
}
}
let queue = new Queue({concurrency: 10})
queue.add(...jobs(3));
queue.onFinish.then(() => console.log('Aloha!'));
queue.start();
</script></body>
</html>
Raw
jsbin.jivusuz.js
// return a promise resolving (or rejecting) in *time*
const delay = (() => {
let counter = 0; // incremental job id
let progress = {}; // keeps job ids that are being resolved
return (time) => {
counter++;
// job start
console.log('BEING PROCESSED: ' + Object.keys(progress).length);
console.log(`+ ${counter} START job`);
progress[counter] = true;
return new Promise((resolve, reject) => {
setTimeout(((i) => {
// job stop
console.log(`- ${i} END job`)
delete progress[i];
const threshold = 1 // should it resolve or not?
if (Math.random() <= threshold) return resolve(i) // yes
else return reject(i); // no
}).bind(this, counter), time || Math.random() * 2000); // wait 0-2000ms
});
};
})();
// return an array of jobs
const jobs = (number) => {
return [...Array(number).keys()].map(() => delay);
}
// write a class that throttles the concurrency and responds
// to the following interface
class Deferred {
constructor() {
this.promise = new Promise((resolve, reject)=> {
this.reject = reject
this.resolve = resolve
})
}
}
class Queue{
constructor({concurrency}) {
this.concurrency = concurrency;
this.jobs = [];
this.endCounter = 0;
this.dfd= new Deferred();
}
add(...incomingJobs) {
this.endCounter = incomingJobs.length;
this.jobs = incomingJobs;
}
runNextJob() {
const job = this.jobs.shift();
if (!job) {
return;
}
this.executeJob(job)
};
executeJob(job) {
job()
.then(val => {
this.runNextJob();
this.endCounter--;
if (this.endCounter === 0) {
this.dfd.resolve();
}
})
.catch(err => console.log(Error('Job execution failed')));
}
get onFinish() {
return this.dfd.promise;
}
start () {
for(let i=0;i<this.concurrency;i++){
const job = this.jobs.shift();
if (!job) {
return;
}
this.executeJob(job)
}
}
}
let queue = new Queue({concurrency: 10})
queue.add(...jobs(3));
queue.onFinish.then(() => console.log('Aloha!'));
queue.start();
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