Created
July 25, 2019 09:45
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Request synchronization
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| <html> | |
| <head> | |
| <script> | |
| class Service { | |
| inProgress = null; | |
| async uploadData() { | |
| if (!this.inProgress) { | |
| console.log('ohay, I\'m actually doing a request'); | |
| this.inProgress = new Promise(resolve => { | |
| // simulate a request by resolving after 3s | |
| setTimeout(() => { | |
| this.inProgress = null; | |
| resolve(Math.random()); | |
| }, 3000); | |
| }); | |
| } | |
| return this.inProgress | |
| } | |
| } | |
| const service = new Service(); | |
| (async function () { | |
| const results = await Promise.all([ | |
| service.uploadData(), | |
| service.uploadData(), | |
| service.uploadData(), | |
| service.uploadData(), | |
| ]); | |
| console.log(results); | |
| console.log(await service.uploadData()); | |
| console.log(await service.uploadData()); | |
| })(); | |
| </script> | |
| </head> | |
| <body> | |
| <h1>sync</h1> | |
| </body> | |
| </html> |
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