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CacheFacade.js
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Sun, Jul 6, 08:31

CacheFacade.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const asyncLib = require("neo-async");
const getLazyHashedEtag = require("./cache/getLazyHashedEtag");
const mergeEtags = require("./cache/mergeEtags");
/** @typedef {import("./Cache")} Cache */
/** @typedef {import("./Cache").Etag} Etag */
/** @typedef {import("./WebpackError")} WebpackError */
/** @typedef {import("./cache/getLazyHashedEtag").HashableObject} HashableObject */
/**
* @template T
* @callback CallbackCache
* @param {WebpackError=} err
* @param {T=} result
* @returns {void}
*/
/**
* @template T
* @callback CallbackNormalErrorCache
* @param {Error=} err
* @param {T=} result
* @returns {void}
*/
class MultiItemCache {
/**
* @param {ItemCacheFacade[]} items item caches
*/
constructor(items) {
this._items = items;
}
/**
* @template T
* @param {CallbackCache<T>} callback signals when the value is retrieved
* @returns {void}
*/
get(callback) {
const next = i => {
this._items[i].get((err, result) => {
if (err) return callback(err);
if (result !== undefined) return callback(null, result);
if (++i >= this._items.length) return callback();
next(i);
});
};
next(0);
}
/**
* @template T
* @returns {Promise<T>} promise with the data
*/
getPromise() {
const next = i => {
return this._items[i].getPromise().then(result => {
if (result !== undefined) return result;
if (++i < this._items.length) return next(i);
});
};
return next(0);
}
/**
* @template T
* @param {T} data the value to store
* @param {CallbackCache<void>} callback signals when the value is stored
* @returns {void}
*/
store(data, callback) {
asyncLib.each(
this._items,
(item, callback) => item.store(data, callback),
callback
);
}
/**
* @template T
* @param {T} data the value to store
* @returns {Promise<void>} promise signals when the value is stored
*/
storePromise(data) {
return Promise.all(
this._items.map(item => item.storePromise(data))
).then(() => {});
}
}
class ItemCacheFacade {
/**
* @param {Cache} cache the root cache
* @param {string} name the child cache item name
* @param {Etag | null} etag the etag
*/
constructor(cache, name, etag) {
this._cache = cache;
this._name = name;
this._etag = etag;
}
/**
* @template T
* @param {CallbackCache<T>} callback signals when the value is retrieved
* @returns {void}
*/
get(callback) {
this._cache.get(this._name, this._etag, callback);
}
/**
* @template T
* @returns {Promise<T>} promise with the data
*/
getPromise() {
return new Promise((resolve, reject) => {
this._cache.get(this._name, this._etag, (err, data) => {
if (err) {
reject(err);
} else {
resolve(data);
}
});
});
}
/**
* @template T
* @param {T} data the value to store
* @param {CallbackCache<void>} callback signals when the value is stored
* @returns {void}
*/
store(data, callback) {
this._cache.store(this._name, this._etag, data, callback);
}
/**
* @template T
* @param {T} data the value to store
* @returns {Promise<void>} promise signals when the value is stored
*/
storePromise(data) {
return new Promise((resolve, reject) => {
this._cache.store(this._name, this._etag, data, err => {
if (err) {
reject(err);
} else {
resolve();
}
});
});
}
/**
* @template T
* @param {function(CallbackNormalErrorCache<T>): void} computer function to compute the value if not cached
* @param {CallbackNormalErrorCache<T>} callback signals when the value is retrieved
* @returns {void}
*/
provide(computer, callback) {
this.get((err, cacheEntry) => {
if (err) return callback(err);
if (cacheEntry !== undefined) return cacheEntry;
computer((err, result) => {
if (err) return callback(err);
this.store(result, err => {
if (err) return callback(err);
callback(null, result);
});
});
});
}
/**
* @template T
* @param {function(): Promise<T> | T} computer function to compute the value if not cached
* @returns {Promise<T>} promise with the data
*/
async providePromise(computer) {
const cacheEntry = await this.getPromise();
if (cacheEntry !== undefined) return cacheEntry;
const result = await computer();
await this.storePromise(result);
return result;
}
}
class CacheFacade {
/**
* @param {Cache} cache the root cache
* @param {string} name the child cache name
*/
constructor(cache, name) {
this._cache = cache;
this._name = name;
}
/**
* @param {string} name the child cache name#
* @returns {CacheFacade} child cache
*/
getChildCache(name) {
return new CacheFacade(this._cache, `${this._name}|${name}`);
}
/**
* @param {string} identifier the cache identifier
* @param {Etag | null} etag the etag
* @returns {ItemCacheFacade} item cache
*/
getItemCache(identifier, etag) {
return new ItemCacheFacade(
this._cache,
`${this._name}|${identifier}`,
etag
);
}
/**
* @param {HashableObject} obj an hashable object
* @returns {Etag} an etag that is lazy hashed
*/
getLazyHashedEtag(obj) {
return getLazyHashedEtag(obj);
}
/**
* @param {Etag} a an etag
* @param {Etag} b another etag
* @returns {Etag} an etag that represents both
*/
mergeEtags(a, b) {
return mergeEtags(a, b);
}
/**
* @template T
* @param {string} identifier the cache identifier
* @param {Etag | null} etag the etag
* @param {CallbackCache<T>} callback signals when the value is retrieved
* @returns {void}
*/
get(identifier, etag, callback) {
this._cache.get(`${this._name}|${identifier}`, etag, callback);
}
/**
* @template T
* @param {string} identifier the cache identifier
* @param {Etag | null} etag the etag
* @returns {Promise<T>} promise with the data
*/
getPromise(identifier, etag) {
return new Promise((resolve, reject) => {
this._cache.get(`${this._name}|${identifier}`, etag, (err, data) => {
if (err) {
reject(err);
} else {
resolve(data);
}
});
});
}
/**
* @template T
* @param {string} identifier the cache identifier
* @param {Etag | null} etag the etag
* @param {T} data the value to store
* @param {CallbackCache<void>} callback signals when the value is stored
* @returns {void}
*/
store(identifier, etag, data, callback) {
this._cache.store(`${this._name}|${identifier}`, etag, data, callback);
}
/**
* @template T
* @param {string} identifier the cache identifier
* @param {Etag | null} etag the etag
* @param {T} data the value to store
* @returns {Promise<void>} promise signals when the value is stored
*/
storePromise(identifier, etag, data) {
return new Promise((resolve, reject) => {
this._cache.store(`${this._name}|${identifier}`, etag, data, err => {
if (err) {
reject(err);
} else {
resolve();
}
});
});
}
/**
* @template T
* @param {string} identifier the cache identifier
* @param {Etag | null} etag the etag
* @param {function(CallbackNormalErrorCache<T>): void} computer function to compute the value if not cached
* @param {CallbackNormalErrorCache<T>} callback signals when the value is retrieved
* @returns {void}
*/
provide(identifier, etag, computer, callback) {
this.get(identifier, etag, (err, cacheEntry) => {
if (err) return callback(err);
if (cacheEntry !== undefined) return cacheEntry;
computer((err, result) => {
if (err) return callback(err);
this.store(identifier, etag, result, err => {
if (err) return callback(err);
callback(null, result);
});
});
});
}
/**
* @template T
* @param {string} identifier the cache identifier
* @param {Etag | null} etag the etag
* @param {function(): Promise<T> | T} computer function to compute the value if not cached
* @returns {Promise<T>} promise with the data
*/
async providePromise(identifier, etag, computer) {
const cacheEntry = await this.getPromise(identifier, etag);
if (cacheEntry !== undefined) return cacheEntry;
const result = await computer();
await this.storePromise(identifier, etag, result);
return result;
}
}
module.exports = CacheFacade;
module.exports.ItemCacheFacade = ItemCacheFacade;
module.exports.MultiItemCache = MultiItemCache;

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