78 lines
1.5 KiB
JavaScript
Executable File
78 lines
1.5 KiB
JavaScript
Executable File
/**
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* @license
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* Copyright The Closure Library Authors.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @fileoverview Simple freelist.
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*
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* An anterative to goog.structs.SimplePool, it imposes the requirement that the
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* objects in the list contain a "next" property that can be used to maintain
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* the pool.
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*/
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goog.provide('goog.async.FreeList');
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/**
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* @template ITEM
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*/
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goog.async.FreeList = class {
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/**
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* @param {function():ITEM} create
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* @param {function(ITEM):void} reset
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* @param {number} limit
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*/
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constructor(create, reset, limit) {
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/** @private @const {number} */
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this.limit_ = limit;
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/** @private @const {function()} */
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this.create_ = create;
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/** @private @const {function(ITEM):void} */
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this.reset_ = reset;
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/** @private {number} */
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this.occupants_ = 0;
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/** @private {ITEM} */
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this.head_ = null;
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}
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/**
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* @return {ITEM}
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*/
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get() {
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let item;
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if (this.occupants_ > 0) {
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this.occupants_--;
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item = this.head_;
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this.head_ = item.next;
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item.next = null;
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} else {
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item = this.create_();
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}
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return item;
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}
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/**
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* @param {ITEM} item An item available for possible future reuse.
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*/
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put(item) {
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this.reset_(item);
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if (this.occupants_ < this.limit_) {
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this.occupants_++;
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item.next = this.head_;
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this.head_ = item;
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}
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}
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/**
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* Visible for testing.
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* @package
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* @return {number}
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*/
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occupants() {
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return this.occupants_;
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}
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};
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