https://github.com/lizhengnacl/hold-on

hold on, waiting for long-running operations
https://github.com/lizhengnacl/hold-on

await concurrence koa2

Last synced: about 2 months ago
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hold on, waiting for long-running operations

• Host: GitHub
• URL: https://github.com/lizhengnacl/hold-on
• Owner: lizhengnacl
• Created: 2018-08-28T15:04:33.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2018-08-28T15:59:34.000Z (almost 8 years ago)
• Last Synced: 2025-03-09T22:39:52.807Z (over 1 year ago)
• Topics: await, concurrence, koa2
• Language: JavaScript
• Homepage: https://github.com/lizhengnacl/hold-on
• Size: 5.86 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
## 背景

并发场景下，避免相同耗时操作`action`被重复触发，第`1`个请求触发`action`后，后续`n`个同质请求被`await`住，直到`action`执行结束，`n`个同质请求再继续执行，并直接使用`action`的结果。

## 示例

```

const HoldOn = require('koa2-hold-on');

const holdOn = new HoldOn();

// 判断是否进入耗时操作

const key = 'some key';

let status = holdOn.get(key);

if(status !== 'hold') {

    holdOn.hold(key);

    

    await action(); // 模拟耗时操作

    

    holdOn.release(key);

}

await holdOn.wait(key);

// 结束耗时操作，继续流程

```