const BaseItem = require('lib/models/BaseItem'); class ModelCache { constructor() { this.cache_ = {}; } async byIds(itemType, ids) { const ModelClass = BaseItem.getClassByItemType(itemType); const output = []; const remainingIds = []; for (let i = 0; i < ids.length; i++) { const id = ids[i]; if (!this.cache_[id]) { remainingIds.push(id); } else { output.push(this.cache_[id].model); } } const models = await ModelClass.byIds(remainingIds); for (let i = 0; i < models.length; i++) { this.cache_[models[i].id] = { model: models[i], timestamp: Date.now(), } output.push(models[i]); } return output; } } module.exports = ModelCache;