136 lines
4.0 KiB
JavaScript
136 lines
4.0 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 MemoryWithGcCachePlugin {
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/**
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* @param {object} options Options
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* @param {number} options.maxGenerations max generations
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*/
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constructor({ maxGenerations }) {
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this._maxGenerations = maxGenerations;
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}
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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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const maxGenerations = this._maxGenerations;
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/** @type {Map<string, { etag: Etag | null, data: any } | undefined | null>} */
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const cache = new Map();
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/** @type {Map<string, { entry: { etag: Etag | null, data: any } | null, until: number }>} */
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const oldCache = new Map();
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let generation = 0;
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let cachePosition = 0;
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const logger = compiler.getInfrastructureLogger("MemoryWithGcCachePlugin");
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compiler.hooks.afterDone.tap("MemoryWithGcCachePlugin", () => {
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generation++;
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let clearedEntries = 0;
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let lastClearedIdentifier;
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// Avoid coverage problems due indirect changes
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/* istanbul ignore next */
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for (const [identifier, entry] of oldCache) {
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if (entry.until > generation) break;
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oldCache.delete(identifier);
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if (cache.get(identifier) === undefined) {
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cache.delete(identifier);
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clearedEntries++;
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lastClearedIdentifier = identifier;
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}
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}
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if (clearedEntries > 0 || oldCache.size > 0) {
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logger.log(
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`${cache.size - oldCache.size} active entries, ${
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oldCache.size
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} recently unused cached entries${
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clearedEntries > 0
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? `, ${clearedEntries} old unused cache entries removed e. g. ${lastClearedIdentifier}`
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: ""
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}`
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);
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}
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let i = (cache.size / maxGenerations) | 0;
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let j = cachePosition >= cache.size ? 0 : cachePosition;
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cachePosition = j + i;
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for (const [identifier, entry] of cache) {
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if (j !== 0) {
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j--;
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continue;
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}
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if (entry !== undefined) {
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// We don't delete the cache entry, but set it to undefined instead
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// This reserves the location in the data table and avoids rehashing
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// when constantly adding and removing entries.
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// It will be deleted when removed from oldCache.
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cache.set(identifier, undefined);
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oldCache.delete(identifier);
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oldCache.set(identifier, {
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entry,
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until: generation + maxGenerations
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});
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if (i-- === 0) break;
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}
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}
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});
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compiler.cache.hooks.store.tap(
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{ name: "MemoryWithGcCachePlugin", 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: "MemoryWithGcCachePlugin", 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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const oldCacheEntry = oldCache.get(identifier);
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if (oldCacheEntry !== undefined) {
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const cacheEntry = oldCacheEntry.entry;
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if (cacheEntry === null) {
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oldCache.delete(identifier);
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cache.set(identifier, cacheEntry);
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return null;
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}
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if (cacheEntry.etag !== etag) return null;
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oldCache.delete(identifier);
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cache.set(identifier, cacheEntry);
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return cacheEntry.data;
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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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compiler.cache.hooks.shutdown.tap(
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{ name: "MemoryWithGcCachePlugin", stage: Cache.STAGE_MEMORY },
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() => {
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cache.clear();
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oldCache.clear();
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}
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);
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}
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}
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module.exports = MemoryWithGcCachePlugin;
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