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ember-concurrency: an experience report
Reg Braithwaite
June 05, 2017
Programming
1
77
ember-concurrency: an experience report
An informal talk given at the EmberTO meetup in June, 2017
Reg Braithwaite
June 05, 2017
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Transcript
ember-concurrency "an experience report" Reginald @raganwald Braithwaite, PagerDuty Inc.
ember-concurrency ember-concurrency is an Ember Addon that makes it easy
to write concise, robust, and beautiful asynchronous code. --http://ember-concurrency.com/ Reginald @raganwald Braithwaite, PagerDuty Inc.
tasks and instances aTask = task(function * () { const
{ geolocation, store } = this.get(...); const coords = yield geolocation.getCoords(); const result = yield store.getNearbyStores(coords); this.set('result', result); }); anInstance = someTask.perform(); Reginald @raganwald Braithwaite, PagerDuty Inc.
problems ember-concurrency solves, easily Reginald @raganwald Braithwaite, PagerDuty Inc.
mashing the "submit" button on an update Reginald @raganwald Braithwaite,
PagerDuty Inc.
! Reginald @raganwald Braithwaite, PagerDuty Inc.
concurrency protocols task(function * () { // ... }).drop() (ember-concurrency
calls these "modifiers") Reginald @raganwald Braithwaite, PagerDuty Inc.
! Reginald @raganwald Braithwaite, PagerDuty Inc.
displaying a loading spinner Reginald @raganwald Braithwaite, PagerDuty Inc.
! this.set('isLoading', true); this.xhr = fetch(id).then( success => { this.set('isLoading',
false); // ... }, failure => { this.set('isLoading', false); // ... }); Reginald @raganwald Braithwaite, PagerDuty Inc.
! isLoading: reads('fetchTask.isRunning') Reginald @raganwald Braithwaite, PagerDuty Inc.
using ember-concurrency to solve other problems Reginald @raganwald Braithwaite, PagerDuty
Inc.
chunking updates to our api Reginald @raganwald Braithwaite, PagerDuty Inc.
progress const chunks = _.chunk(incidents, CHUNK_SIZE); let done = 0;
this.set('done', done); for (const theseIncidents of chunks) { yield this.resolve(theseIncidents); done = done + theseIncidents.length); this.set('done', done); } Reginald @raganwald Braithwaite, PagerDuty Inc.
Reginald @raganwald Braithwaite, PagerDuty Inc.
cancellation aTask.cancelAll(); anInstance.cancel(); Reginald @raganwald Braithwaite, PagerDuty Inc.
a bigger challenge Reginald @raganwald Braithwaite, PagerDuty Inc.
In JavaScript, AJAX requests happen concurrently. Reginald @raganwald Braithwaite, PagerDuty
Inc.
Reginald @raganwald Braithwaite, PagerDuty Inc.
⛈ websocket ping: [-----------------] submit update: [-----------] Reginald @raganwald Braithwaite,
PagerDuty Inc.
☀ Reginald @raganwald Braithwaite, PagerDuty Inc.
sharing one task task(function * (promissoryThunk) { let result; yield
promissoryThunk().then(value => { result = value; }); return result; }).enqueue() Reginald @raganwald Braithwaite, PagerDuty Inc.
serialized results websocket ping: [--------] submit update: [-------] Reginald @raganwald
Braithwaite, PagerDuty Inc.
⁉ Reginald @raganwald Braithwaite, PagerDuty Inc.
task groups tasks: taskGroup().enqueue(), handlePing: task(function * () { //
... }).group('tasks'), submitUpdate: task(function * () { // ... }).group('tasks') Reginald @raganwald Braithwaite, PagerDuty Inc.
ember-concurrency conclusion Reginald @raganwald Braithwaite, PagerDuty Inc.
Simple things are easy, complex things are possible. Reginald @raganwald
Braithwaite, PagerDuty Inc.
Reginald @raganwald Braithwaite, PagerDuty Inc.