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<!DOCTYPE html><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"><meta http-equiv="Content-Language" content="en"><meta http-equiv="X-UA-Compatible" content="IE=edge"><title>workqueue.js</title><link href="../../../../dossier.css" rel="stylesheet" type="text/css"><header><div><form><div><input type="search" placeholder="Search" tabindex="1"></div></form></div></header><main><article class="srcfile"><h1>lib/goog/async/workqueue.js</h1><div><table><tr><td><a id="l1"></a><a href="#l1">1</a><td>// Copyright 2015 The Closure Library Authors. All Rights Reserved.<tr><td><a id="l2"></a><a href="#l2">2</a><td>//<tr><td><a id="l3"></a><a href="#l3">3</a><td>// Licensed under the Apache License, Version 2.0 (the "License");<tr><td><a id="l4"></a><a href="#l4">4</a><td>// you may not use this file except in compliance with the License.<tr><td><a id="l5"></a><a href="#l5">5</a><td>// You may obtain a copy of the License at<tr><td><a id="l6"></a><a href="#l6">6</a><td>//<tr><td><a id="l7"></a><a href="#l7">7</a><td>// http://www.apache.org/licenses/LICENSE-2.0<tr><td><a id="l8"></a><a href="#l8">8</a><td>//<tr><td><a id="l9"></a><a href="#l9">9</a><td>// Unless required by applicable law or agreed to in writing, software<tr><td><a id="l10"></a><a href="#l10">10</a><td>// distributed under the License is distributed on an "AS-IS" BASIS,<tr><td><a id="l11"></a><a href="#l11">11</a><td>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<tr><td><a id="l12"></a><a href="#l12">12</a><td>// See the License for the specific language governing permissions and<tr><td><a id="l13"></a><a href="#l13">13</a><td>// limitations under the License.<tr><td><a id="l14"></a><a href="#l14">14</a><td><tr><td><a id="l15"></a><a href="#l15">15</a><td>goog.provide('goog.async.WorkItem');<tr><td><a id="l16"></a><a href="#l16">16</a><td>goog.provide('goog.async.WorkQueue');<tr><td><a id="l17"></a><a href="#l17">17</a><td><tr><td><a id="l18"></a><a href="#l18">18</a><td>goog.require('goog.asserts');<tr><td><a id="l19"></a><a href="#l19">19</a><td>goog.require('goog.async.FreeList');<tr><td><a id="l20"></a><a href="#l20">20</a><td><tr><td><a id="l21"></a><a href="#l21">21</a><td><tr><td><a id="l22"></a><a href="#l22">22</a><td>// TODO(johnlenz): generalize the WorkQueue if this is used by more<tr><td><a id="l23"></a><a href="#l23">23</a><td>// than goog.async.run.<tr><td><a id="l24"></a><a href="#l24">24</a><td><tr><td><a id="l25"></a><a href="#l25">25</a><td><tr><td><a id="l26"></a><a href="#l26">26</a><td><tr><td><a id="l27"></a><a href="#l27">27</a><td>/**<tr><td><a id="l28"></a><a href="#l28">28</a><td> * A low GC workqueue. The key elements of this design:<tr><td><a id="l29"></a><a href="#l29">29</a><td> * - avoids the need for goog.bind or equivalent by carrying scope<tr><td><a id="l30"></a><a href="#l30">30</a><td> * - avoids the need for array reallocation by using a linked list<tr><td><a id="l31"></a><a href="#l31">31</a><td> * - minimizes work entry objects allocation by recycling objects<tr><td><a id="l32"></a><a href="#l32">32</a><td> * @constructor<tr><td><a id="l33"></a><a href="#l33">33</a><td> * @final<tr><td><a id="l34"></a><a href="#l34">34</a><td> * @struct<tr><td><a id="l35"></a><a href="#l35">35</a><td> */<tr><td><a id="l36"></a><a href="#l36">36</a><td>goog.async.WorkQueue = function() {<tr><td><a id="l37"></a><a href="#l37">37</a><td> this.workHead_ = null;<tr><td><a id="l38"></a><a href="#l38">38</a><td> this.workTail_ = null;<tr><td><a id="l39"></a><a href="#l39">39</a><td>};<tr><td><a id="l40"></a><a href="#l40">40</a><td><tr><td><a id="l41"></a><a href="#l41">41</a><td><tr><td><a id="l42"></a><a href="#l42">42</a><td>/** @define {number} The maximum number of entries to keep for recycling. */<tr><td><a id="l43"></a><a href="#l43">43</a><td>goog.define('goog.async.WorkQueue.DEFAULT_MAX_UNUSED', 100);<tr><td><a id="l44"></a><a href="#l44">44</a><td><tr><td><a id="l45"></a><a href="#l45">45</a><td><tr><td><a id="l46"></a><a href="#l46">46</a><td>/** @const @private {goog.async.FreeList<goog.async.WorkItem>} */<tr><td><a id="l47"></a><a href="#l47">47</a><td>goog.async.WorkQueue.freelist_ = new goog.async.FreeList(<tr><td><a id="l48"></a><a href="#l48">48</a><td> function() {return new goog.async.WorkItem(); },<tr><td><a id="l49"></a><a href="#l49">49</a><td> function(item) {item.reset()},<tr><td><a id="l50"></a><a href="#l50">50</a><td> goog.async.WorkQueue.DEFAULT_MAX_UNUSED);<tr><td><a id="l51"></a><a href="#l51">51</a><td><tr><td><a id="l52"></a><a href="#l52">52</a><td><tr><td><a id="l53"></a><a href="#l53">53</a><td>/**<tr><td><a id="l54"></a><a href="#l54">54</a><td> * @param {function()} fn<tr><td><a id="l55"></a><a href="#l55">55</a><td> * @param {Object|null|undefined} scope<tr><td><a id="l56"></a><a href="#l56">56</a><td> */<tr><td><a id="l57"></a><a href="#l57">57</a><td>goog.async.WorkQueue.prototype.add = function(fn, scope) {<tr><td><a id="l58"></a><a href="#l58">58</a><td> var item = this.getUnusedItem_();<tr><td><a id="l59"></a><a href="#l59">59</a><td> item.set(fn, scope);<tr><td><a id="l60"></a><a href="#l60">60</a><td><tr><td><a id="l61"></a><a href="#l61">61</a><td> if (this.workTail_) {<tr><td><a id="l62"></a><a href="#l62">62</a><td> this.workTail_.next = item;<tr><td><a id="l63"></a><a href="#l63">63</a><td> this.workTail_ = item;<tr><td><a id="l64"></a><a href="#l64">64</a><td> } else {<tr><td><a id="l65"></a><a href="#l65">65</a><td> goog.asserts.assert(!this.workHead_);<tr><td><a id="l66"></a><a href="#l66">66</a><td> this.workHead_ = item;<tr><td><a id="l67"></a><a href="#l67">67</a><td> this.workTail_ = item;<tr><td><a id="l68"></a><a href="#l68">68</a><td> }<tr><td><a id="l69"></a><a href="#l69">69</a><td>};<tr><td><a id="l70"></a><a href="#l70">70</a><td><tr><td><a id="l71"></a><a href="#l71">71</a><td><tr><td><a id="l72"></a><a href="#l72">72</a><td>/**<tr><td><a id="l73"></a><a href="#l73">73</a><td> * @return {goog.async.WorkItem}<tr><td><a id="l74"></a><a href="#l74">74</a><td> */<tr><td><a id="l75"></a><a href="#l75">75</a><td>goog.async.WorkQueue.prototype.remove = function() {<tr><td><a id="l76"></a><a href="#l76">76</a><td> var item = null;<tr><td><a id="l77"></a><a href="#l77">77</a><td><tr><td><a id="l78"></a><a href="#l78">78</a><td> if (this.workHead_) {<tr><td><a id="l79"></a><a href="#l79">79</a><td> item = this.workHead_;<tr><td><a id="l80"></a><a href="#l80">80</a><td> this.workHead_ = this.workHead_.next;<tr><td><a id="l81"></a><a href="#l81">81</a><td> if (!this.workHead_) {<tr><td><a id="l82"></a><a href="#l82">82</a><td> this.workTail_ = null;<tr><td><a id="l83"></a><a href="#l83">83</a><td> }<tr><td><a id="l84"></a><a href="#l84">84</a><td> item.next = null;<tr><td><a id="l85"></a><a href="#l85">85</a><td> }<tr><td><a id="l86"></a><a href="#l86">86</a><td> return item;<tr><td><a id="l87"></a><a href="#l87">87</a><td>};<tr><td><a id="l88"></a><a href="#l88">88</a><td><tr><td><a id="l89"></a><a href="#l89">89</a><td><tr><td><a id="l90"></a><a href="#l90">90</a><td>/**<tr><td><a id="l91"></a><a href="#l91">91</a><td> * @param {goog.async.WorkItem} item<tr><td><a id="l92"></a><a href="#l92">92</a><td> */<tr><td><a id="l93"></a><a href="#l93">93</a><td>goog.async.WorkQueue.prototype.returnUnused = function(item) {<tr><td><a id="l94"></a><a href="#l94">94</a><td> goog.async.WorkQueue.freelist_.put(item);<tr><td><a id="l95"></a><a href="#l95">95</a><td>};<tr><td><a id="l96"></a><a href="#l96">96</a><td><tr><td><a id="l97"></a><a href="#l97">97</a><td><tr><td><a id="l98"></a><a href="#l98">98</a><td>/**<tr><td><a id="l99"></a><a href="#l99">99</a><td> * @return {goog.async.WorkItem}<tr><td><a id="l100"></a><a href="#l100">100</a><td> * @private<tr><td><a id="l101"></a><a href="#l101">101</a><td> */<tr><td><a id="l102"></a><a href="#l102">102</a><td>goog.async.WorkQueue.prototype.getUnusedItem_ = function() {<tr><td><a id="l103"></a><a href="#l103">103</a><td> return goog.async.WorkQueue.freelist_.get();<tr><td><a id="l104"></a><a href="#l104">104</a><td>};<tr><td><a id="l105"></a><a href="#l105">105</a><td><tr><td><a id="l106"></a><a href="#l106">106</a><td><tr><td><a id="l107"></a><a href="#l107">107</a><td><tr><td><a id="l108"></a><a href="#l108">108</a><td>/**<tr><td><a id="l109"></a><a href="#l109">109</a><td> * @constructor<tr><td><a id="l110"></a><a href="#l110">110</a><td> * @final<tr><td><a id="l111"></a><a href="#l111">111</a><td> * @struct<tr><td><a id="l112"></a><a href="#l112">112</a><td> */<tr><td><a id="l113"></a><a href="#l113">113</a><td>goog.async.WorkItem = function() {<tr><td><a id="l114"></a><a href="#l114">114</a><td> /** @type {?function()} */<tr><td><a id="l115"></a><a href="#l115">115</a><td> this.fn = null;<tr><td><a id="l116"></a><a href="#l116">116</a><td> /** @type {Object|null|undefined} */<tr><td><a id="l117"></a><a href="#l117">117</a><td> this.scope = null;<tr><td><a id="l118"></a><a href="#l118">118</a><td> /** @type {?goog.async.WorkItem} */<tr><td><a id="l119"></a><a href="#l119">119</a><td> this.next = null;<tr><td><a id="l120"></a><a href="#l120">120</a><td>};<tr><td><a id="l121"></a><a href="#l121">121</a><td><tr><td><a id="l122"></a><a href="#l122">122</a><td><tr><td><a id="l123"></a><a href="#l123">123</a><td>/**<tr><td><a id="l124"></a><a href="#l124">124</a><td> * @param {function()} fn<tr><td><a id="l125"></a><a href="#l125">125</a><td> * @param {Object|null|undefined} scope<tr><td><a id="l126"></a><a href="#l126">126</a><td> */<tr><td><a id="l127"></a><a href="#l127">127</a><td>goog.async.WorkItem.prototype.set = function(fn, scope) {<tr><td><a id="l128"></a><a href="#l128">128</a><td> this.fn = fn;<tr><td><a id="l129"></a><a href="#l129">129</a><td> this.scope = scope;<tr><td><a id="l130"></a><a href="#l130">130</a><td> this.next = null;<tr><td><a id="l131"></a><a href="#l131">131</a><td>};<tr><td><a id="l132"></a><a href="#l132">132</a><td><tr><td><a id="l133"></a><a href="#l133">133</a><td><tr><td><a id="l134"></a><a href="#l134">134</a><td>/** Reset the work item so they don't prevent GC before reuse */<tr><td><a id="l135"></a><a href="#l135">135</a><td>goog.async.WorkItem.prototype.reset = function() {<tr><td><a id="l136"></a><a href="#l136">136</a><td> this.fn = null;<tr><td><a id="l137"></a><a href="#l137">137</a><td> this.scope = null;<tr><td><a id="l138"></a><a href="#l138">138</a><td> this.next = null;<tr><td><a id="l139"></a><a href="#l139">139</a><td>};</table></div></article><nav><h3><a href="../../../../index.html" tabindex="2">Overview</a></h3><div><input type="checkbox" id="nav-modules" 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