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joplin/ReactNativeClient/lib/ModelCache.js
Laurent Cozic 55c5ddedf4 Revert "Applied prettier to code base"
This reverts commit c4f19465a6.
2018-03-09 20:59:12 +00:00

39 lines
803 B
JavaScript

class ModelCache {
constructor(maxSize) {
this.cache_ = [];
this.maxSize_ = maxSize;
}
fromCache(ModelClass, id) {
for (let i = 0; i < this.cache_.length; i++) {
const c = this.cache_[i];
if (c.id === id && c.modelType === ModelClass.modelType()) return c
}
return null;
}
cache(ModelClass, id, model) {
if (this.fromCache(ModelClass, model.id)) return;
this.cache_.push({
id: id,
model: model,
modelType: ModelClass.modelType(),
});
if (this.cache_.length > this.maxSize_) {
this.cache_.splice(0, 1);
}
}
async load(ModelClass, id) {
const cached = this.fromCache(ModelClass, id);
if (cached) return cached.model;
const output = await ModelClass.load(id);
this.cache(ModelClass, id, output);
return output;
}
}
module.exports = ModelCache;