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[react-packager] Cache in-memory file lookups (~200ms win on file change)

This commit is contained in:
Amjad Masad 2015-06-19 22:48:36 -07:00
parent 2d4055e513
commit 2845e78080
1 changed files with 10 additions and 2 deletions
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12
packager/react-packager/src/DependencyResolver/fastfs.js vendored
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@ -11,6 +11,7 @@ const path = require('path');
const readDir = Promise.promisify(fs.readdir);
const readFile = Promise.promisify(fs.readFile);
const stat = Promise.promisify(fs.stat);
const hasOwn = Object.prototype.hasOwnProperty;
class Fastfs extends EventEmitter {
constructor(roots, fileWatcher, {ignore, pattern}) {
@ -19,6 +20,7 @@ class Fastfs extends EventEmitter {
this._ignore = ignore;
this._pattern = pattern;
this._roots = roots.map(root => new File(root, { isDir: true }));
this._fastPaths = Object.create(null);
}
build() {
@ -120,7 +122,12 @@ class Fastfs extends EventEmitter {
}
_getFile(filePath) {
return this._getAndAssertRoot(filePath).getFileFromPath(filePath);
filePath = path.normalize(filePath);
if (!hasOwn.call(this._fastPaths, filePath)) {
this._fastPaths[filePath] = this._getAndAssertRoot(filePath).getFileFromPath(filePath);
}
return this._fastPaths[filePath];
}
_add(file) {
@ -161,7 +168,6 @@ class Fastfs extends EventEmitter {
}
// Make sure this event belongs to one of our roots.
if (!this._getRoot(absPath)) {
return;
}
@ -173,6 +179,8 @@ class Fastfs extends EventEmitter {
}
}
delete this._fastPaths[path.normalize(absPath)];
if (type !== 'delete') {
this._add(new File(absPath, {
isDir: false,