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桃花镇童长老

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LRUCacheUtil, LRUCache cache tool class

#harmonyos #harmony #arkts

Introduction and description of harmony-utils

harmony-utils A HarmonyOS tool library with rich features and extremely easy to use, with the help of many practical tools, is committed to helping developers quickly build Hongmeng applications. Its encapsulated tools cover APP, device, screen, authorization, notification, inter-thread communication, pop-up frames, toast, biometric authentication, user preferences, taking photos, albums, scanning codes, files, logs, exception capture, characters, strings, numbers, collections, dates, random, base64, encryption, decryption, JSON and other functions, which can meet various development needs.

picker_utils It is a sub-store split by harmony-utils, including PickerUtil, PhotoHelper, and ScanUtil.

Download and install

ohpm i @pura/harmony-utils

ohpm i @pura/picker_utils

  //Global initialization method, initialized in the onCreate method of UIAbility AppUtil.init()
  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
    AppUtil.init(this.context);
  }
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API methods and usage

getInstance Gets a single case of LRUCacheUtil 
 private lruCache: LRUCacheUtil = LRUCacheUtil.getInstance();
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has to determine whether the cache corresponding to the key is included 
let pwd = this.lruCache.has("pwd");
ToastUtil.showToast(`缓存是否存在：${pwd}`);
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put add cache to lruCache 
 this.lruCache.put("pwd", "abcd@12345");
 ToastUtil.showToast("缓存密码成功");
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get get the cache corresponding to the key 
let pwd = this.lruCache.get<string>("pwd");
ToastUtil.showToast(`取值：${pwd}`);
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remove delete the cache corresponding to the key 
this.lruCache.remove("pwd");
ToastUtil.showToast(`删除成功！`);
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isEmpty determines whether the lruCache cache is empty 
let blEmpty = this.lruCache.isEmpty();
ToastUtil.showToast(`缓存是否为空：${blEmpty}`);
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getCapacity Gets the capacity of the current buffer 
 let count = this.lruCache.getCapacity();
 ToastUtil.showToast(`当前缓冲区的容量：${count}`);
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updateCapacity Reset the capacity of lruCache 
this.lruCache.updateCapacity(128);
ToastUtil.showToast(`重新设置lruCache的容量成功`);
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clear clear cache data and reset lruCache size 
this.lruCache.clear();
ToastUtil.showToast(`清除缓存数据成功`);
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