scheduler.js

A wrapper around Promise to control the execution flow

License

Released under MIT License

Tests

Install mocha : npm install -g mocha Start tests with : npm test

Sequence

Sequence will execute Promises in serie

Example :

let seq = new Sequence();
 
seq
    .next(() => {
        return promise;
    })
    .delay(500)
    .next(() => {
        return new Promise((resolve, reject) => {
            resolve();
        });
    })
    .start();
 
seq.on('started', () => {
    console.log('Sequence started');
});
 
seq.on('next', (pos, total) => {
    console.log(`${pos} / ${total}`);
});
 
seq.on('error', err => {
    console.log(`A promise rejected with ${err}`);
});
 
seq.on('stopped', () => {
    console.log('Sequence stopped');
});
 
seq.on('finished', () => {
    console.log('Sequence finished');
});

API

• constructor() initializes the sequence
• next(Function callback) → Sequence adds a function to the queue
• delay(Number number) → Sequence adds a timeout function to the queue
• stop() stops the sequence
• start() starts the sequence

Events

• error(Object err) triggered when a Promise rejected
• finished() triggered when all the Promise were finished
• next(Number position, Number total) triggered when one promise finished.
• started triggered when the sequence was started
• stopped triggered when the sequence was stopped

Scheduler

Scheduler will execute Sequences in parallel

Example :

let scheduler = new Scheduler();
 
let seq1 = new Sequence();
let seq2 = new Sequence();
 
seq1
    .next(...)
    .delay(500)
    .next(...);
 
seq2
    .next(...)
    .next(...);
 
scheduler
    .add(seq1)
    .set('othername', seq2) // sets scheduler.othername to seq2
    .start();
 

API

• constructor() initializes the scheduler
• add(Sequence seq) → Scheduler adds a sequence to the parallel queue
• set(String name, Sequence seq) → Scheduler same as add, but sets the reference inside the scheduler
• start() starts all the sequences
• stop() stops all the sequences

Events

• error(Object err) triggered when one sequence triggered error
• started triggered when the scheduler was started
• finished triggered when all the sequences triggered finished
• stopped triggered when the scheduler was stopped