@diyaner/ding/libs/decorator.js

dingiyan常用ts/js工具

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.InstanceCache = void 0;
/** 一个实现实例级缓存数据的装饰器 */
function InstanceCache() {
    return function (target, propertyKey, descriptor) {
        const oldMethod = descriptor.value;
        const cacheKey = Symbol.for(`${target.constructor.name}:${propertyKey}:cacheKey`);
        descriptor.value = function (...args) {
            return __awaiter(this, void 0, void 0, function* () {
                const cacheValue = this[cacheKey]; // 此处this应该是实例对象，不是原型对象。
                if (cacheValue !== undefined)
                    return Promise.resolve(cacheValue);
                const result = yield oldMethod.apply(this, args);
                this[cacheKey] = result;
                return result;
            });
        };
    };
}
exports.InstanceCache = InstanceCache;
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