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