52 lines
1.3 KiB
JavaScript
52 lines
1.3 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const Cache = require("../Cache");
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/** @typedef {import("webpack-sources").Source} Source */
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/** @typedef {import("../Cache").Etag} Etag */
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/** @typedef {import("../Compiler")} Compiler */
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/** @typedef {import("../Module")} Module */
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class MemoryCachePlugin {
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/**
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* Apply the plugin
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* @param {Compiler} compiler the compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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/** @type {Map<string, { etag: Etag | null, data: any }>} */
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const cache = new Map();
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compiler.cache.hooks.store.tap(
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{ name: "MemoryCachePlugin", stage: Cache.STAGE_MEMORY },
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(identifier, etag, data) => {
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cache.set(identifier, { etag, data });
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}
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);
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compiler.cache.hooks.get.tap(
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{ name: "MemoryCachePlugin", stage: Cache.STAGE_MEMORY },
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(identifier, etag, gotHandlers) => {
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const cacheEntry = cache.get(identifier);
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if (cacheEntry === null) {
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return null;
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} else if (cacheEntry !== undefined) {
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return cacheEntry.etag === etag ? cacheEntry.data : null;
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}
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gotHandlers.push((result, callback) => {
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if (result === undefined) {
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cache.set(identifier, null);
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} else {
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cache.set(identifier, { etag, data: result });
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}
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return callback();
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});
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}
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);
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}
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}
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module.exports = MemoryCachePlugin;
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