Restart task
This is the way to create a restartable task.
This will cancel the oldest instance of the task and start a new instance of it. You can also
provide a max
that will only restart the oldest task instance if the threshold is exceeded.
To specify a task as restartable, you can either use the dot notation or the options notation.
import { task } from '@sheepdog/vanilla';
const restartTask = task.restart(async () => { // your code});
import { task } from '@sheepdog/vanilla';
const restartTask = task( async () => { // your code }, { kind: 'restart' },);
Max concurrency
Section titled “Max concurrency”This is how you can specify the maximum number of concurrent instances. The default is 1, here we’re setting it to 5.
import { task } from '@sheepdog/vanilla';
const restartTask = task.restart( async () => { // your code }, { max: 5 },);
import { task } from '@sheepdog/vanilla';
const restartTask = task( async () => { // your code }, { kind: 'restart', max: 5 },);
The task
Section titled “The task”The return value of the task function will be an object with getters where you can access state from
all the instances running and eventually cancel them with cancelAll
.
Passing props
Section titled “Passing props”While defining a task, if the function that you pass in has some arguments, those will be required
by the perform
function (and it will be strongly typed too).
import { task } from '@sheepdog/vanilla';
const restartTask = task.restart(async (id: string) => { // your code});
button.addEventListener('click', () => { restartTask.perform('42');});
import { task } from '@sheepdog/vanilla';
const restartTask = task( async (id: string) => { // your code }, { kind: 'restart' },);
button.addEventListener('click', () => { restartTask.perform('42');});
Getting the return value
Section titled “Getting the return value”If you return something from your task you can access the return value by awaiting the perform
function.
import { task } from '@sheepdog/vanilla';
const restartTask = task.restart(async () => { return 42;});
button.addEventListener('click', () => { const number = await restartTask.perform(); console.log(number); // 42});
import { task } from '@sheepdog/vanilla';
const restartTask = task( async () => { return 42; }, { kind: 'restart' },);
button.addEventListener('click', () => { const number = await restartTask.perform(); console.log(number); // 42});
Getting the TaskInstance
Section titled “Getting the TaskInstance”If you don’t await the perform
function, then you’ll get back the
task instance that you can use either to cancel it or to get its
current state. The TaskInstance
is also an object with getters you can access the current value
with instance.value
or register events on it with instance.on
.
import { task } from '@sheepdog/vanilla';
const restartTask = task.restart(async () => { // your code});
button.addEventListener('click', () => { const lastRun = restartTask.perform(); lastRun.on('success', () => { console.log(lastRun.value); }); lastRun.cancel();});
import { task } from '@sheepdog/vanilla';
const restartTask = task( async () => { // your code }, { kind: 'restart' },);
button.addEventListener('click', () => { lastRun = restartTask.perform(); lastRun.on('success', () => { console.log(lastRun.value); }); lastRun.cancel();});