Pique is a library that creates a queue of functions that are guaranteed to be run exactly once and in serial FIFO order. So that the first enqueue function will complete before the second is executed.
Below is the basic usage of the priority queue by adding items to the queue with the push method.
const Pique = require('pique');
const pq = new Pique();
const firstPromise = pq.push((resolve, reject) => {
$http.get(gameData).then(resolve).catch(reject);
}).then(result => {
populateGameData(result);
}).catch(err => {
handleError(err);
});
const secondPromise = pq.push((resolve, reject) => {
$http.get(playerData).then(resolve).catch(reject);
}).then(result => {
populdatePlayerData(result);
}).catch(err => {
handleError(err);
});We can also add items to the front of the queue with the unshift method.
const Pique = require('pique');
const pq = new Pique();
const firstPromise = pq.push((resolve, reject) => {
$http.get(gameData).then(resolve).catch(reject);
}).then(result => {
populateGameData(result);
}).catch(err => {
handleError(err);
});
// Add to the front of the list
const secondPromise = pq.unshift((resolve, reject) => {
$http.get(playerData).then(resolve).catch(reject);
}).then(result => {
populdatePlayerData(result);
}).catch(err => {
handleError(err);
});To show the push versus unshift in action, let's take a contrived example of putting several promises together and we will show the results in different orders based upon which method we used.
const Pique = require('pique');
const pq = new Pique();
// Set the first for 20 seconds
pq.push((res) => setTimeout(() => res(42), 20000))
.then((x) => console.log(x));
// Set the second up to first at 15 seconds
pq.unshift((res) => setTimeout(() => res(56), 15000))
.then((x) => console.log(x));
// Set the second up one at 10 seconds
pq.unshift((res) => setTimeout(() => res(78), 10000))
.then((x) => console.log(x));
// Finally add one for 5 seconds
pq.push((res) => setTimeout(() => res(96), 5000))
.then((x) => console.log(x));
// => 78
// => 56
// => 42
// => 96If you are not in an environment with a native Promise, you can set your own using the configure method to specify which ES2015 compliant Promise implementation you like.
const Pique = require('pique');
Pique.configure(require('lie'));
const pq = new Pique();You can use Pique in both the browser and Node.js.
You can install Pique by installing via NPM.
$ npm install piqueOf you can reference the pique.js or pique.min.js in your browser.
<script src="pique.min.js"></script>Creates a queue of functions that are guaranteed to be run exactly once and in serial FIFO order. So that the first enqueue function will complete before the second is executed.
const Pique = require('pique');
const pq = new Pique();
pq.push((resolve, reject) => {
setTimeout(() => res(42), 5000);
}).then(result => {
console.log(result);
});Configures which Promise constructor to use for creating Promises for chaining. Note that this can be any Promise implementation that is ES2015 compliant.
promiseCtor:Object- A Promise constructor used to create promises. Note that this must be ES2015 compliant to support boththenandcatchmethods.
const Pique = require('pique');
Pique.configure(require('lie'));
const pq = new Pique();Enqueue a function to be executed only when all the functions enqueued before it have been executed.
fn:Function- This is the callback function used in a Promise. The function that will be called when its turn in the queue comes up. The function takes as arguments the resolve and reject functions used with promises. So the function can run asynchronously and indicate their success or failure using the resolve or reject function arguments. This takes the following arguments:resolve:Function- used to resolve the Promise.reject:Function- used to reject the Promise.
Promise - A promise that will resolve or be rejected depending on the outcome of the submitted function.
const Pique = require('pique');
const pq = new Pique();
pq.push((resolve, reject) => {
setTimeout(() => res(42), 5000);
}).then(result => {
console.log(result);
});
pq.push((resolve, reject) => {
setTimeout(() => res(56), 5000);
}).then(result => {
console.log(result);
});
// => 42
// => 56Enqueue a function at the head of the queue. It will be executed as soon as the current promise (if any) resolves, before anyone who called enqueue. If multiple calls are made to enqueueAtTop then they will be enqueued at the head of the queue in LIFO order.
fn:Function- This is the callback function used in a Promise. The function that will be called when its turn in the queue comes up. The function takes as arguments the resolve and reject functions used with promises. So the function can run asynchronously and indicate their success or failure using the resolve or reject function arguments. This takes the following arguments:resolve:Function- used to resolve the Promise.reject:Function- used to reject the Promise.
Promise - A promise that will resolve or be rejected depending on the outcome of the submitted function.
const Pique = require('pique');
const pq = new Pique();
pq.push((resolve, reject) => {
setTimeout(() => res(42), 5000);
}).then(result => {
console.log(result);
});
pq.unshift((resolve, reject) => {
setTimeout(() => res(56), 1000);
}).then(result => {
console.log(result);
});
// => 56
// => 42The MIT License (MIT)
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