app/include/cache.js

'use strict';

/**
 * 아주 단순한 in-process handler cache.
 * key = `${type}@@${path}`
 * value = function(req) { ... }
 */
class HandlerCache {
  constructor() {
    this._map = new Map();
  }

  _key(type, path) {
    return `${type}@@${path}`;
  }

  setCache(type, path, handler) {
    if (typeof handler !== 'function') return;
    this._map.set(this._key(type, path), handler);
  }

  getCache(type, path) {
    return this._map.get(this._key(type, path)) || null;
  }

  removeCache(type, path) {
    this._map.delete(this._key(type, path));
  }

  clear() {
    this._map.clear();
  }
}

module.exports = new HandlerCache();