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apache / logging-log4j-site / 9755b12b39efbc0142688f9b1a11ec68db89f97b / . / 2.13.3 / log4j-core / xref / org / apache / logging / log4j / core / util / ClockFactory.html
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<div id="overview"><a href="../../../../../../../apidocs/org/apache/logging/log4j/core/util/ClockFactory.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.util;
<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> org.apache.logging.log4j.core.time.PreciseClock;
<a class="jxr_linenumber" name="L20" href="#L20">20</a> <strong class="jxr_keyword">import</strong> org.apache.logging.log4j.status.StatusLogger;
<a class="jxr_linenumber" name="L21" href="#L21">21</a> <strong class="jxr_keyword">import</strong> org.apache.logging.log4j.util.PropertiesUtil;
<a class="jxr_linenumber" name="L22" href="#L22">22</a> <strong class="jxr_keyword">import</strong> org.apache.logging.log4j.util.Supplier;
<a class="jxr_linenumber" name="L23" href="#L23">23</a>
<a class="jxr_linenumber" name="L24" href="#L24">24</a> <strong class="jxr_keyword">import</strong> java.util.HashMap;
<a class="jxr_linenumber" name="L25" href="#L25">25</a> <strong class="jxr_keyword">import</strong> java.util.Map;
<a class="jxr_linenumber" name="L26" href="#L26">26</a>
<a class="jxr_linenumber" name="L27" href="#L27">27</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L28" href="#L28">28</a> <em class="jxr_javadoccomment"> * Factory for {@code Clock} objects.</em>
<a class="jxr_linenumber" name="L29" href="#L29">29</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L30" href="#L30">30</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../../org/apache/logging/log4j/core/util/ClockFactory.html">ClockFactory</a> {
<a class="jxr_linenumber" name="L31" href="#L31">31</a>
<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> <em class="jxr_javadoccomment"> * Name of the system property that can be used to specify a {@code Clock}</em>
<a class="jxr_linenumber" name="L34" href="#L34">34</a> <em class="jxr_javadoccomment"> * implementation class. The value of this property is {@value}.</em>
<a class="jxr_linenumber" name="L35" href="#L35">35</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L36" href="#L36">36</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String PROPERTY_NAME = <span class="jxr_string">"log4j.Clock"</span>;
<a class="jxr_linenumber" name="L37" href="#L37">37</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> StatusLogger LOGGER = StatusLogger.getLogger();
<a class="jxr_linenumber" name="L38" href="#L38">38</a>
<a class="jxr_linenumber" name="L39" href="#L39">39</a> <em class="jxr_comment">// private static final Clock clock = createClock();</em>
<a class="jxr_linenumber" name="L40" href="#L40">40</a>
<a class="jxr_linenumber" name="L41" href="#L41">41</a> <strong class="jxr_keyword">private</strong> <a href="../../../../../../org/apache/logging/log4j/core/util/ClockFactory.html">ClockFactory</a>() {
<a class="jxr_linenumber" name="L42" href="#L42">42</a> }
<a class="jxr_linenumber" name="L43" href="#L43">43</a>
<a class="jxr_linenumber" name="L44" href="#L44">44</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L45" href="#L45">45</a> <em class="jxr_javadoccomment"> * Returns a {@code Clock} instance depending on the value of system</em>
<a class="jxr_linenumber" name="L46" href="#L46">46</a> <em class="jxr_javadoccomment"> * property {@link #PROPERTY_NAME}.</em>
<a class="jxr_linenumber" name="L47" href="#L47">47</a> <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="L48" href="#L48">48</a> <em class="jxr_javadoccomment"> * If system property {@code log4j.Clock=CachedClock} is specified,</em>
<a class="jxr_linenumber" name="L49" href="#L49">49</a> <em class="jxr_javadoccomment"> * this method returns an instance of {@link CachedClock}. If system</em>
<a class="jxr_linenumber" name="L50" href="#L50">50</a> <em class="jxr_javadoccomment"> * property {@code log4j.Clock=CoarseCachedClock} is specified, this</em>
<a class="jxr_linenumber" name="L51" href="#L51">51</a> <em class="jxr_javadoccomment"> * method returns an instance of {@link CoarseCachedClock}.</em>
<a class="jxr_linenumber" name="L52" href="#L52">52</a> <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="L53" href="#L53">53</a> <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="L54" href="#L54">54</a> <em class="jxr_javadoccomment"> * If another value is specified, this value is taken as the fully qualified</em>
<a class="jxr_linenumber" name="L55" href="#L55">55</a> <em class="jxr_javadoccomment"> * class name of a class that implements the {@code Clock} interface. An</em>
<a class="jxr_linenumber" name="L56" href="#L56">56</a> <em class="jxr_javadoccomment"> * object of this class is instantiated and returned.</em>
<a class="jxr_linenumber" name="L57" href="#L57">57</a> <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="L58" href="#L58">58</a> <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="L59" href="#L59">59</a> <em class="jxr_javadoccomment"> * If no value is specified, or if the specified value could not correctly</em>
<a class="jxr_linenumber" name="L60" href="#L60">60</a> <em class="jxr_javadoccomment"> * be instantiated or did not implement the {@code Clock} interface, then an</em>
<a class="jxr_linenumber" name="L61" href="#L61">61</a> <em class="jxr_javadoccomment"> * instance of {@link SystemClock} is returned.</em>
<a class="jxr_linenumber" name="L62" href="#L62">62</a> <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="L63" href="#L63">63</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L64" href="#L64">64</a> <em class="jxr_javadoccomment"> * @return a {@code Clock} instance</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> <strong class="jxr_keyword">static</strong> <a href="../../../../../../org/apache/logging/log4j/core/util/Clock.html">Clock</a> getClock() {
<a class="jxr_linenumber" name="L67" href="#L67">67</a> <strong class="jxr_keyword">return</strong> createClock();
<a class="jxr_linenumber" name="L68" href="#L68">68</a> }
<a class="jxr_linenumber" name="L69" href="#L69">69</a>
<a class="jxr_linenumber" name="L70" href="#L70">70</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Map&lt;String, Supplier&lt;Clock&gt;&gt; aliases() {
<a class="jxr_linenumber" name="L71" href="#L71">71</a> <strong class="jxr_keyword">final</strong> Map&lt;String, Supplier&lt;Clock&gt;&gt; result = <strong class="jxr_keyword">new</strong> HashMap&lt;&gt;();
<a class="jxr_linenumber" name="L72" href="#L72">72</a> result.put(<span class="jxr_string">"SystemClock"</span>, <strong class="jxr_keyword">new</strong> Supplier&lt;Clock&gt;() { @Override <strong class="jxr_keyword">public</strong> Clock get() { <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> SystemClock(); } });
<a class="jxr_linenumber" name="L73" href="#L73">73</a> result.put(<span class="jxr_string">"SystemMillisClock"</span>, <strong class="jxr_keyword">new</strong> Supplier&lt;Clock&gt;() { @Override <strong class="jxr_keyword">public</strong> Clock get() { <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> SystemMillisClock(); } });
<a class="jxr_linenumber" name="L74" href="#L74">74</a> result.put(<span class="jxr_string">"CachedClock"</span>, <strong class="jxr_keyword">new</strong> Supplier&lt;Clock&gt;() { @Override <strong class="jxr_keyword">public</strong> Clock get() { <strong class="jxr_keyword">return</strong> CachedClock.instance(); } });
<a class="jxr_linenumber" name="L75" href="#L75">75</a> result.put(<span class="jxr_string">"CoarseCachedClock"</span>, <strong class="jxr_keyword">new</strong> Supplier&lt;Clock&gt;() { @Override <strong class="jxr_keyword">public</strong> Clock get() { <strong class="jxr_keyword">return</strong> CoarseCachedClock.instance(); } });
<a class="jxr_linenumber" name="L76" href="#L76">76</a> result.put(<span class="jxr_string">"org.apache.logging.log4j.core.util.CachedClock"</span>, <strong class="jxr_keyword">new</strong> Supplier&lt;Clock&gt;() { @Override <strong class="jxr_keyword">public</strong> Clock get() { <strong class="jxr_keyword">return</strong> CachedClock.instance(); } });
<a class="jxr_linenumber" name="L77" href="#L77">77</a> result.put(<span class="jxr_string">"org.apache.logging.log4j.core.util.CoarseCachedClock"</span>, <strong class="jxr_keyword">new</strong> Supplier&lt;Clock&gt;() { @Override <strong class="jxr_keyword">public</strong> Clock get() { <strong class="jxr_keyword">return</strong> CoarseCachedClock.instance(); } });
<a class="jxr_linenumber" name="L78" href="#L78">78</a> <strong class="jxr_keyword">return</strong> result;
<a class="jxr_linenumber" name="L79" href="#L79">79</a> }
<a class="jxr_linenumber" name="L80" href="#L80">80</a>
<a class="jxr_linenumber" name="L81" href="#L81">81</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../../../org/apache/logging/log4j/core/util/Clock.html">Clock</a> createClock() {
<a class="jxr_linenumber" name="L82" href="#L82">82</a> <strong class="jxr_keyword">final</strong> String userRequest = PropertiesUtil.getProperties().getStringProperty(PROPERTY_NAME);
<a class="jxr_linenumber" name="L83" href="#L83">83</a> <strong class="jxr_keyword">if</strong> (userRequest == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="L84" href="#L84">84</a> LOGGER.trace(<span class="jxr_string">"Using default SystemClock for timestamps."</span>);
<a class="jxr_linenumber" name="L85" href="#L85">85</a> <strong class="jxr_keyword">return</strong> logSupportedPrecision(<strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/logging/log4j/core/util/SystemClock.html">SystemClock</a>());
<a class="jxr_linenumber" name="L86" href="#L86">86</a> }
<a class="jxr_linenumber" name="L87" href="#L87">87</a> <strong class="jxr_keyword">final</strong> Supplier&lt;Clock&gt; specified = aliases().get(userRequest);
<a class="jxr_linenumber" name="L88" href="#L88">88</a> <strong class="jxr_keyword">if</strong> (specified != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="L89" href="#L89">89</a> LOGGER.trace(<span class="jxr_string">"Using specified {} for timestamps."</span>, userRequest);
<a class="jxr_linenumber" name="L90" href="#L90">90</a> <strong class="jxr_keyword">return</strong> logSupportedPrecision(specified.get());
<a class="jxr_linenumber" name="L91" href="#L91">91</a> }
<a class="jxr_linenumber" name="L92" href="#L92">92</a> <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="L93" href="#L93">93</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/apache/logging/log4j/core/util/Clock.html">Clock</a> result = Loader.newCheckedInstanceOf(userRequest, Clock.<strong class="jxr_keyword">class</strong>);
<a class="jxr_linenumber" name="L94" href="#L94">94</a> LOGGER.trace(<span class="jxr_string">"Using {} for timestamps."</span>, result.getClass().getName());
<a class="jxr_linenumber" name="L95" href="#L95">95</a> <strong class="jxr_keyword">return</strong> logSupportedPrecision(result);
<a class="jxr_linenumber" name="L96" href="#L96">96</a> } <strong class="jxr_keyword">catch</strong> (<strong class="jxr_keyword">final</strong> Exception e) {
<a class="jxr_linenumber" name="L97" href="#L97">97</a> <strong class="jxr_keyword">final</strong> String fmt = <span class="jxr_string">"Could not create {}: {}, using default SystemClock for timestamps."</span>;
<a class="jxr_linenumber" name="L98" href="#L98">98</a> LOGGER.error(fmt, userRequest, e);
<a class="jxr_linenumber" name="L99" href="#L99">99</a> <strong class="jxr_keyword">return</strong> logSupportedPrecision(<strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/logging/log4j/core/util/SystemClock.html">SystemClock</a>());
<a class="jxr_linenumber" name="L100" href="#L100">100</a> }
<a class="jxr_linenumber" name="L101" href="#L101">101</a> }
<a class="jxr_linenumber" name="L102" href="#L102">102</a>
<a class="jxr_linenumber" name="L103" href="#L103">103</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../../../org/apache/logging/log4j/core/util/Clock.html">Clock</a> logSupportedPrecision(<strong class="jxr_keyword">final</strong> <a href="../../../../../../org/apache/logging/log4j/core/util/Clock.html">Clock</a> clock) {
<a class="jxr_linenumber" name="L104" href="#L104">104</a> <strong class="jxr_keyword">final</strong> String support = clock instanceof <a href="../../../../../../org/apache/logging/log4j/core/time/PreciseClock.html">PreciseClock</a> ? <span class="jxr_string">"supports"</span> : <span class="jxr_string">"does not support"</span>;
<a class="jxr_linenumber" name="L105" href="#L105">105</a> LOGGER.debug(<span class="jxr_string">"{} {} precise timestamps."</span>, clock.getClass().getName(), support);
<a class="jxr_linenumber" name="L106" href="#L106">106</a> <strong class="jxr_keyword">return</strong> clock;
<a class="jxr_linenumber" name="L107" href="#L107">107</a> }
<a class="jxr_linenumber" name="L108" href="#L108">108</a> }
</pre>
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