Node.js 实现简单的无侵入式缓存框架的方法

var cache = {
  has: (key) => {
 if (key === 1) return true
 else return false
  },
  get: (key) => {
    return "cached value " + key
  }
}

定义测试方法

function request(key) {
 return 'value of ' + key
}

应用注入

request = request.cache()

执行一下

request(2)
"value of 2"
request(1)
"cached value 1"

看到结果按照预期输出，完美！

最后实现

项目引用了 

memory-cache

simple-cache.js
const cache = require('memory-cache');
Function.prototype.cache = function (cachekey, time) {
  var _self = this;
  return function() {
 var key = cachekey(arguments);
    var value = cache.get(key);
    if (!value) {
      value = _self.apply(this, arguments)
  cache.put(key, value, time);
    }
    return value;
  }
}
var simpleCache = {
 cache: function(f, cacheKey, cacheTime) {
 return f.cache(cacheKey, cacheTime);
 }
}
module.exports = simpleCache
sample.js
const cache = require('simple-cache-z').cache;
function cachekey(args) {
  return args[0]}
function request(key) {
  return (new Date()).getTime();
}
request = cache(request, cachekey, 5000);
console.log('request 1 ', request(1));
setTimeout(() => {
  console.log('request 2 ', request(2));
}, 1000)
setTimeout(()=> {
  console.log('request 1 ', request(1))
  console.log('request 1 ', request(1))
  console.log('request 1 ', request(1))
  console.log('request 2 ', request(2));
  console.log('request 2 ', request(2));
  console.log('request 2 ', request(2));
}, 2000);
setTimeout(()=> {
  console.log('request 1 ', request(1));
  console.log('request 1 ', request(1));
  console.log('request 1 ', request(1));
  console.log('request 2 ', request(2));
  console.log('request 2 ', request(2));
  console.log('request 2 ', request(2));
}, 10000);

输出结果

request 1  1563000551142
// 1000 ms
request 2  1563000552150
// 2000 ms
request 1  1563000551142
request 1  1563000551142
request 1  1563000551142
request 2  1563000552150
request 2  1563000552150
request 2  1563000552150
// 10000 ms
request 1  1563000561151
request 1  1563000561151
request 1  1563000561151
request 2  1563000561151
request 2  1563000561151
request 2  1563000561151

大功告成！