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September 12, 2020 11:36
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@nybblr inspired semaphore solution for limiting concurrent execution
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| class Semaphore { | |
| constructor(max) { | |
| this.tasks = []; | |
| this.counter = max; | |
| this.dispatch = this.dispatch.bind(this); | |
| } | |
| dispatch() { | |
| if (this.counter > 0 && this.tasks.length > 0) { | |
| this.counter--; | |
| this.tasks.shift()(); | |
| } | |
| } | |
| release() { | |
| this.counter++; | |
| this.dispatch(); | |
| } | |
| acquire() { | |
| return new Promise(res => { | |
| this.tasks.push(res); | |
| setTimeout(this.dispatch, 100); | |
| }); | |
| } | |
| } | |
| var semaphore = new Semaphore(2); | |
| var run = (async() => { | |
| await semaphore.acquire(); | |
| console.log('first runner'); | |
| await semaphore.acquire(); | |
| console.log('second runner'); | |
| await semaphore.acquire(); | |
| console.log('third runner'); | |
| })(); |
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