DiskLruCache

ohpm install @ohos/disklrucache

import { DiskLruCache } from '@ohos/disklrucache'

testDiskLruCache: DiskLruCache = undefined

import Ability from '@ohos.application.Ability'
export default class MainAbility extends Ability {
    onCreate(want, launchParam) {
        GlobalContext.getContext.setObject("context", this.context)
    }
 }

// Create a folder named diskLruCache with the application cache path and set the disk cache size to 3 MB. (This disk cache size is optional, with a default value of 300 MB and maximum value of 300 MB.)
this.testDiskLruCache = DiskLruCache.create(GlobalContext.getContext.getObject("context"), 3 * 1024 * 1024)

let data: string = "Hello World Simple Example.";
this.testDiskLruCache.set('test', data);

let data:ArrayBuffer = this.testDiskLruCache.get('test');
console.log(String.fromCharCode.aplly(null, new Uint8Array(data)));

import fs from '@ohos.file.fs';

let path = '/data/storage/el2/base/com.example.disklrucache/entry/files/testFile.txt';
let fd = fs.openSync(path, 0o2);
let length = fs.statSync(path).size;
let data = new ArrayBuffer(length);
fs.readSync(fd, data);
this.testDiskLruCache.set('testFile', data);

let data:ArrayBuffer = this.testDiskLruCache.get('testFile');

let value: string = "Hello World Simple Example.";
this.testDiskLruCache.setAsync('test', value).then(() => {
    this.testDiskLruCache.getAsync('test').then((data) => {
        console.log(String.fromCharCode.aplly(null, new Uint8Array(data)));
    })
}).catch((err) => {
    console.log('err =' + err);
})

import fs from '@ohos.file.fs';

let path = '/data/storage/el2/base/com.example.disklrucache/entry/files/testFile.txt';
let file = fs.openSync(path, 0o2);
let length = fs.statSync(path).size;
let value = new ArrayBuffer(length);
fs.readSync(file.fd, data);
this.testDiskLruCache.setAsync('test', value).then(() => {
  this.testDiskLruCache.getAsync('test').then((data) => {
    console.log(String.fromCharCode.aplly(null, new Uint8Array(data)));
  })
}).catch((err) => {
  console.log('err =' + err);
})

/disklrucache/src/
- main/ets/components
    - cache                  # Code related to the cache
       - CustomMap.ets       # Custom Map encapsulation
       - DiskCacheEntry.ets  # Disk cache entry
       - DiskLruCache.ets    # Disk-based LRU cache policy
       - FileReader.ets      # Code for reading and writing files
       - FileUtils.ets       # File utility class      
/entry/src/
- main/ets     
    - pages                  # List of test pages
       - index.ets           # Testing disk cache page