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apache / logging-log4j-site / 9755b12b39efbc0142688f9b1a11ec68db89f97b / . / 2.13.0 / log4j-core / xref / org / apache / logging / log4j / core / config / AppenderControlArraySet.html
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<div id="overview"><a href="../../../../../../../apidocs/org/apache/logging/log4j/core/config/AppenderControlArraySet.html">View Javadoc</a></div><pre>
<a class="jxr_linenumber" name="L1" href="#L1">1</a> <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="L2" href="#L2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a class="jxr_linenumber" name="L3" href="#L3">3</a> <em class="jxr_comment"> * contributor license agreements. See the NOTICE file distributed with</em>
<a class="jxr_linenumber" name="L4" href="#L4">4</a> <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
<a class="jxr_linenumber" name="L5" href="#L5">5</a> <em class="jxr_comment"> * The ASF licenses this file to You under the Apache license, Version 2.0</em>
<a class="jxr_linenumber" name="L6" href="#L6">6</a> <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
<a class="jxr_linenumber" name="L7" href="#L7">7</a> <em class="jxr_comment"> * the License. You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="L8" href="#L8">8</a> <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="L9" href="#L9">9</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2." target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.</a>0</em>
<a class="jxr_linenumber" name="L10" href="#L10">10</a> <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="L11" href="#L11">11</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="L12" href="#L12">12</a> <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="L13" href="#L13">13</a> <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="L14" href="#L14">14</a> <em class="jxr_comment"> * See the license for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="L15" href="#L15">15</a> <em class="jxr_comment"> * limitations under the license.</em>
<a class="jxr_linenumber" name="L16" href="#L16">16</a> <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="L17" href="#L17">17</a> <strong class="jxr_keyword">package</strong> org.apache.logging.log4j.core.config;
<a class="jxr_linenumber" name="L18" href="#L18">18</a>
<a class="jxr_linenumber" name="L19" href="#L19">19</a> <strong class="jxr_keyword">import</strong> java.util.Arrays;
<a class="jxr_linenumber" name="L20" href="#L20">20</a> <strong class="jxr_keyword">import</strong> java.util.HashMap;
<a class="jxr_linenumber" name="L21" href="#L21">21</a> <strong class="jxr_keyword">import</strong> java.util.Map;
<a class="jxr_linenumber" name="L22" href="#L22">22</a> <strong class="jxr_keyword">import</strong> java.util.Objects;
<a class="jxr_linenumber" name="L23" href="#L23">23</a> <strong class="jxr_keyword">import</strong> java.util.concurrent.atomic.AtomicReference;
<a class="jxr_linenumber" name="L24" href="#L24">24</a>
<a class="jxr_linenumber" name="L25" href="#L25">25</a> <strong class="jxr_keyword">import</strong> org.apache.logging.log4j.core.Appender;
<a class="jxr_linenumber" name="L26" href="#L26">26</a> <strong class="jxr_keyword">import</strong> org.apache.logging.log4j.util.PerformanceSensitive;
<a class="jxr_linenumber" name="L27" href="#L27">27</a>
<a class="jxr_linenumber" name="L28" href="#L28">28</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L29" href="#L29">29</a> <em class="jxr_javadoccomment"> * Data structure with similar semantics to CopyOnWriteArraySet, but giving direct access to the underlying array.</em>
<a class="jxr_linenumber" name="L30" href="#L30">30</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L31" href="#L31">31</a> <em class="jxr_javadoccomment"> * @since 2.6</em>
<a class="jxr_linenumber" name="L32" href="#L32">32</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L33" href="#L33">33</a> @PerformanceSensitive
<a class="jxr_linenumber" name="L34" href="#L34">34</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControlArraySet.html">AppenderControlArraySet</a> {
<a class="jxr_linenumber" name="L35" href="#L35">35</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> AtomicReference&lt;AppenderControl[]&gt; appenderArray = <strong class="jxr_keyword">new</strong> AtomicReference&lt;&gt;(<strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a>[0]);
<a class="jxr_linenumber" name="L36" href="#L36">36</a>
<a class="jxr_linenumber" name="L37" href="#L37">37</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L38" href="#L38">38</a> <em class="jxr_javadoccomment"> * Adds an AppenderControl to this set. If this set already contains the element, the call leaves the set unchanged</em>
<a class="jxr_linenumber" name="L39" href="#L39">39</a> <em class="jxr_javadoccomment"> * and returns false.</em>
<a class="jxr_linenumber" name="L40" href="#L40">40</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L41" href="#L41">41</a> <em class="jxr_javadoccomment"> * @param control The AppenderControl to add.</em>
<a class="jxr_linenumber" name="L42" href="#L42">42</a> <em class="jxr_javadoccomment"> * @return true if this set did not already contain the specified element</em>
<a class="jxr_linenumber" name="L43" href="#L43">43</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L44" href="#L44">44</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> add(<strong class="jxr_keyword">final</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a> control) {
<a class="jxr_linenumber" name="L45" href="#L45">45</a> <strong class="jxr_keyword">boolean</strong> success;
<a class="jxr_linenumber" name="L46" href="#L46">46</a> <strong class="jxr_keyword">do</strong> {
<a class="jxr_linenumber" name="L47" href="#L47">47</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a>[] original = appenderArray.get();
<a class="jxr_linenumber" name="L48" href="#L48">48</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">final</strong> AppenderControl existing : original) {
<a class="jxr_linenumber" name="L49" href="#L49">49</a> <strong class="jxr_keyword">if</strong> (existing.equals(control)) {
<a class="jxr_linenumber" name="L50" href="#L50">50</a> <strong class="jxr_keyword">return</strong> false; <em class="jxr_comment">// the appender is already in the list</em>
<a class="jxr_linenumber" name="L51" href="#L51">51</a> }
<a class="jxr_linenumber" name="L52" href="#L52">52</a> }
<a class="jxr_linenumber" name="L53" href="#L53">53</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a>[] copy = Arrays.copyOf(original, original.length + 1);
<a class="jxr_linenumber" name="L54" href="#L54">54</a> copy[copy.length - 1] = control;
<a class="jxr_linenumber" name="L55" href="#L55">55</a> success = appenderArray.compareAndSet(original, copy);
<a class="jxr_linenumber" name="L56" href="#L56">56</a> } <strong class="jxr_keyword">while</strong> (!success); <em class="jxr_comment">// could not swap: array was modified by another thread</em>
<a class="jxr_linenumber" name="L57" href="#L57">57</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; <em class="jxr_comment">// successfully added</em>
<a class="jxr_linenumber" name="L58" href="#L58">58</a> }
<a class="jxr_linenumber" name="L59" href="#L59">59</a>
<a class="jxr_linenumber" name="L60" href="#L60">60</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L61" href="#L61">61</a> <em class="jxr_javadoccomment"> * Removes the AppenderControl with the specific name and returns it (or {@code null} if no such appender existed).</em>
<a class="jxr_linenumber" name="L62" href="#L62">62</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L63" href="#L63">63</a> <em class="jxr_javadoccomment"> * @param name The name of the AppenderControl to remove</em>
<a class="jxr_linenumber" name="L64" href="#L64">64</a> <em class="jxr_javadoccomment"> * @return the removed AppenderControl or {@code null}</em>
<a class="jxr_linenumber" name="L65" href="#L65">65</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L66" href="#L66">66</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a> remove(<strong class="jxr_keyword">final</strong> String name) {
<a class="jxr_linenumber" name="L67" href="#L67">67</a> <strong class="jxr_keyword">boolean</strong> success;
<a class="jxr_linenumber" name="L68" href="#L68">68</a> <strong class="jxr_keyword">do</strong> {
<a class="jxr_linenumber" name="L69" href="#L69">69</a> success = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="L70" href="#L70">70</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a>[] original = appenderArray.get();
<a class="jxr_linenumber" name="L71" href="#L71">71</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; original.length; i++) {
<a class="jxr_linenumber" name="L72" href="#L72">72</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a> appenderControl = original[i];
<a class="jxr_linenumber" name="L73" href="#L73">73</a> <strong class="jxr_keyword">if</strong> (Objects.equals(name, appenderControl.getAppenderName())) {
<a class="jxr_linenumber" name="L74" href="#L74">74</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a>[] copy = removeElementAt(i, original);
<a class="jxr_linenumber" name="L75" href="#L75">75</a> <strong class="jxr_keyword">if</strong> (appenderArray.compareAndSet(original, copy)) {
<a class="jxr_linenumber" name="L76" href="#L76">76</a> <strong class="jxr_keyword">return</strong> appenderControl; <em class="jxr_comment">// successfully removed</em>
<a class="jxr_linenumber" name="L77" href="#L77">77</a> }
<a class="jxr_linenumber" name="L78" href="#L78">78</a> success = false; <em class="jxr_comment">// could not swap: array was modified by another thread</em>
<a class="jxr_linenumber" name="L79" href="#L79">79</a> <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="L80" href="#L80">80</a> }
<a class="jxr_linenumber" name="L81" href="#L81">81</a> }
<a class="jxr_linenumber" name="L82" href="#L82">82</a> } <strong class="jxr_keyword">while</strong> (!success);
<a class="jxr_linenumber" name="L83" href="#L83">83</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>; <em class="jxr_comment">// not found</em>
<a class="jxr_linenumber" name="L84" href="#L84">84</a> }
<a class="jxr_linenumber" name="L85" href="#L85">85</a>
<a class="jxr_linenumber" name="L86" href="#L86">86</a> <strong class="jxr_keyword">private</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a>[] removeElementAt(<strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> i, <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a>[] array) {
<a class="jxr_linenumber" name="L87" href="#L87">87</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a>[] result = Arrays.copyOf(array, array.length - 1);
<a class="jxr_linenumber" name="L88" href="#L88">88</a> System.arraycopy(array, i + 1, result, i, result.length - i);
<a class="jxr_linenumber" name="L89" href="#L89">89</a> <strong class="jxr_keyword">return</strong> result;
<a class="jxr_linenumber" name="L90" href="#L90">90</a> }
<a class="jxr_linenumber" name="L91" href="#L91">91</a>
<a class="jxr_linenumber" name="L92" href="#L92">92</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L93" href="#L93">93</a> <em class="jxr_javadoccomment"> * Returns all Appenders as a Map.</em>
<a class="jxr_linenumber" name="L94" href="#L94">94</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L95" href="#L95">95</a> <em class="jxr_javadoccomment"> * @return a Map with the Appender name as the key and the Appender as the value.</em>
<a class="jxr_linenumber" name="L96" href="#L96">96</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L97" href="#L97">97</a> <strong class="jxr_keyword">public</strong> Map&lt;String, Appender&gt; asMap() {
<a class="jxr_linenumber" name="L98" href="#L98">98</a> <strong class="jxr_keyword">final</strong> Map&lt;String, Appender&gt; result = <strong class="jxr_keyword">new</strong> HashMap&lt;&gt;();
<a class="jxr_linenumber" name="L99" href="#L99">99</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">final</strong> AppenderControl appenderControl : appenderArray.get()) {
<a class="jxr_linenumber" name="L100" href="#L100">100</a> result.put(appenderControl.getAppenderName(), appenderControl.getAppender());
<a class="jxr_linenumber" name="L101" href="#L101">101</a> }
<a class="jxr_linenumber" name="L102" href="#L102">102</a> <strong class="jxr_keyword">return</strong> result;
<a class="jxr_linenumber" name="L103" href="#L103">103</a> }
<a class="jxr_linenumber" name="L104" href="#L104">104</a>
<a class="jxr_linenumber" name="L105" href="#L105">105</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L106" href="#L106">106</a> <em class="jxr_javadoccomment"> * Atomically sets the values to an empty array and returns the old array.</em>
<a class="jxr_linenumber" name="L107" href="#L107">107</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L108" href="#L108">108</a> <em class="jxr_javadoccomment"> * @return the contents before this collection was cleared.</em>
<a class="jxr_linenumber" name="L109" href="#L109">109</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L110" href="#L110">110</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a>[] clear() {
<a class="jxr_linenumber" name="L111" href="#L111">111</a> <strong class="jxr_keyword">return</strong> appenderArray.getAndSet(<strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a>[0]);
<a class="jxr_linenumber" name="L112" href="#L112">112</a> }
<a class="jxr_linenumber" name="L113" href="#L113">113</a>
<a class="jxr_linenumber" name="L114" href="#L114">114</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isEmpty() {
<a class="jxr_linenumber" name="L115" href="#L115">115</a> <strong class="jxr_keyword">return</strong> appenderArray.get().length == 0;
<a class="jxr_linenumber" name="L116" href="#L116">116</a> }
<a class="jxr_linenumber" name="L117" href="#L117">117</a>
<a class="jxr_linenumber" name="L118" href="#L118">118</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L119" href="#L119">119</a> <em class="jxr_javadoccomment"> * Returns the underlying array.</em>
<a class="jxr_linenumber" name="L120" href="#L120">120</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L121" href="#L121">121</a> <em class="jxr_javadoccomment"> * @return the array supporting this collection</em>
<a class="jxr_linenumber" name="L122" href="#L122">122</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L123" href="#L123">123</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../../org/apache/logging/log4j/core/config/AppenderControl.html">AppenderControl</a>[] get() {
<a class="jxr_linenumber" name="L124" href="#L124">124</a> <strong class="jxr_keyword">return</strong> appenderArray.get();
<a class="jxr_linenumber" name="L125" href="#L125">125</a> }
<a class="jxr_linenumber" name="L126" href="#L126">126</a>
<a class="jxr_linenumber" name="L127" href="#L127">127</a> @Override
<a class="jxr_linenumber" name="L128" href="#L128">128</a> <strong class="jxr_keyword">public</strong> String toString() {
<a class="jxr_linenumber" name="L129" href="#L129">129</a> <strong class="jxr_keyword">return</strong> <span class="jxr_string">"AppenderControlArraySet [appenderArray="</span> + appenderArray + <span class="jxr_string">"]"</span>;
<a class="jxr_linenumber" name="L130" href="#L130">130</a> }
<a class="jxr_linenumber" name="L131" href="#L131">131</a> }
</pre>
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