111 lines
3.3 KiB
JavaScript
111 lines
3.3 KiB
JavaScript
/**
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* Copyright 2013-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*
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*/
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'use strict';
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var _prodInvariant = require('./reactProdInvariant');
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var invariant = require('fbjs/lib/invariant');
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/**
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* Static poolers. Several custom versions for each potential number of
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* arguments. A completely generic pooler is easy to implement, but would
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* require accessing the `arguments` object. In each of these, `this` refers to
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* the Class itself, not an instance. If any others are needed, simply add them
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* here, or in their own files.
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*/
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var oneArgumentPooler = function (copyFieldsFrom) {
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var Klass = this;
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if (Klass.instancePool.length) {
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var instance = Klass.instancePool.pop();
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Klass.call(instance, copyFieldsFrom);
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return instance;
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} else {
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return new Klass(copyFieldsFrom);
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}
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};
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var twoArgumentPooler = function (a1, a2) {
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var Klass = this;
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if (Klass.instancePool.length) {
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var instance = Klass.instancePool.pop();
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Klass.call(instance, a1, a2);
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return instance;
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} else {
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return new Klass(a1, a2);
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}
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};
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var threeArgumentPooler = function (a1, a2, a3) {
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var Klass = this;
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if (Klass.instancePool.length) {
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var instance = Klass.instancePool.pop();
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Klass.call(instance, a1, a2, a3);
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return instance;
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} else {
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return new Klass(a1, a2, a3);
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}
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};
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var fourArgumentPooler = function (a1, a2, a3, a4) {
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var Klass = this;
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if (Klass.instancePool.length) {
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var instance = Klass.instancePool.pop();
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Klass.call(instance, a1, a2, a3, a4);
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return instance;
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} else {
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return new Klass(a1, a2, a3, a4);
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}
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};
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var standardReleaser = function (instance) {
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var Klass = this;
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!(instance instanceof Klass) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'Trying to release an instance into a pool of a different type.') : _prodInvariant('25') : void 0;
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instance.destructor();
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if (Klass.instancePool.length < Klass.poolSize) {
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Klass.instancePool.push(instance);
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}
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};
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var DEFAULT_POOL_SIZE = 10;
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var DEFAULT_POOLER = oneArgumentPooler;
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/**
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* Augments `CopyConstructor` to be a poolable class, augmenting only the class
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* itself (statically) not adding any prototypical fields. Any CopyConstructor
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* you give this may have a `poolSize` property, and will look for a
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* prototypical `destructor` on instances.
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*
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* @param {Function} CopyConstructor Constructor that can be used to reset.
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* @param {Function} pooler Customizable pooler.
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*/
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var addPoolingTo = function (CopyConstructor, pooler) {
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// Casting as any so that flow ignores the actual implementation and trusts
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// it to match the type we declared
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var NewKlass = CopyConstructor;
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NewKlass.instancePool = [];
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NewKlass.getPooled = pooler || DEFAULT_POOLER;
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if (!NewKlass.poolSize) {
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NewKlass.poolSize = DEFAULT_POOL_SIZE;
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}
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NewKlass.release = standardReleaser;
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return NewKlass;
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};
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var PooledClass = {
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addPoolingTo: addPoolingTo,
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oneArgumentPooler: oneArgumentPooler,
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twoArgumentPooler: twoArgumentPooler,
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threeArgumentPooler: threeArgumentPooler,
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fourArgumentPooler: fourArgumentPooler
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};
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module.exports = PooledClass; |