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logback.drawio
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<mxCell id="jevOpthSYDo48ZPv_LFc-1" value="<h1><font style="font-size: 16px;">Logback 工作原理（1.5.6）</font></h1><div style=""><span style="background-color: initial;"><font style="font-size: 12px;">测试代码: SpringBoot-Labs/logging/logback。</font></span></div><div style=""><font style="font-size: 12px;">从源码梳理 Logback 工作原理，理解清楚内部各种组件的工作职责和关系。</font></div>" style="text;html=1;strokeColor=none;fillColor=none;spacing=5;spacingTop=-20;whiteSpace=wrap;overflow=hidden;rounded=0;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-8" value="通过 Lombok @Slf4j 注解获取<br><font color="#007fff">TODO</font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-16" value="Logger logger = getLogger(clazz.getName());<br><font color="#007fff">以类名作为Logger名</font>" style="rounded=1;whiteSpace=wrap;html=1;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-19" value="<div><font color="#007fff">// 1 此测试中返回的是 <b>LoggerContext </b>实例</font></div><div>ILoggerFactory iLoggerFactory = <b>getILoggerFactory</b>();</div><div><font color="#007fff">// 2 name是类的全限定名的话会按每一层创建一个 Logger, 最后返回的以完整限定名为名的 Logger</font></div><div>return iLoggerFactory.<b>getLogger</b>(name);</div><div><font color="#007fff">先获取 LoggerFactory 实例，从后面看首次执行时才会执行初始化</font></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-25" value="获取Logger的逻辑是先看是不是 ROOT, 是 ROOT 直接返回根 Logger,<br>否则从 <b>loggerCache</b> 中查，存在则直接返回否则创建一个新的Logger 并缓存到 loggerCache" style="rounded=1;whiteSpace=wrap;html=1;align=left;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-27" value="<font color="#007fff"><b>//1 SPI 加载 SLF4JServiceProvider&nbsp;实现, 因为引入的 Logback, 这里实际加载到的是&nbsp;LogbackServiceProvider</b><br></font>List&lt;SLF4JServiceProvider&gt; providersList = <b>findServiceProviders</b>();<br>...<br><font color="#007fff">// provider 如果有多个，使用第一个</font><br><div>PROVIDER = (SLF4JServiceProvider)providersList.get(0);</div><div><font color="#007fff"><b>// 2</b>&nbsp;初始化选中的 Provider&nbsp;</font></div><div>PROVIDER.<b>initialize</b>();</div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=4;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-30" value="<div><font color="#007fff">//从这部分代码看到可以通过 “slf4j.provider” 手动指定我们要使用</font></div><font color="#007fff">SLF4JServiceProvider 实现，没有指定才会通过 SPI 加载<br></font><div>SLF4JServiceProvider explicitProvider = <b>loadExplicitlySpecified</b>(classLoaderOfLoggerFactory);</div><div>if (explicitProvider != null) {</div><div>&nbsp; &nbsp; providerList.add(explicitProvider);</div><div>&nbsp; &nbsp; return providerList;</div><div>} else {</div><div>&nbsp; &nbsp; ServiceLoader&lt;SLF4JServiceProvider&gt; serviceLoader = <b>getServiceLoader</b>(classLoaderOfLoggerFactory);</div><div>&nbsp; &nbsp; Iterator&lt;SLF4JServiceProvider&gt; iterator = serviceLoader.iterator();</div><div>&nbsp; &nbsp; while(iterator.hasNext()) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; safelyInstantiate(providerList, iterator);</div><div>&nbsp; &nbsp; }</div><div>&nbsp; &nbsp; return providerList;</div><div>}</div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=2;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-37" value="<div></div><div><div><div>public void initialize() {</div><div><b><font color="#007fff">&nbsp; &nbsp; // 这个就是 Logger 工厂</font></b></div><div>&nbsp; &nbsp; this.<b>defaultLoggerContext</b> = new <b>LoggerContext</b>();</div><div>&nbsp; &nbsp; this.defaultLoggerContext.setName("default");</div><div><font color="#007fff"><b>&nbsp; &nbsp; // 1 这里面做了一些初始化工作，包括解析 xml 配置文件，初始化组件</b></font></div><div>&nbsp; &nbsp; this.<b>initializeLoggerContext</b>();</div><div>&nbsp; &nbsp; this.defaultLoggerContext.start();</div><div>&nbsp; &nbsp; this.<b>markerFactory</b> = new BasicMarkerFactory();</div><div>&nbsp; &nbsp; this.<b>mdcAdapter</b> = new LogbackMDCAdapter();</div><div>&nbsp; &nbsp; this.defaultLoggerContext.setMDCAdapter(this.mdcAdapter);</div><div>}</div></div></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=2;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-42" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>LogbackServiceProvider</b><br></p><hr size="1"><p style="margin:0px;margin-left:4px;">private LoggerContext <b>defaultLoggerContext</b>;</p><p style="margin:0px;margin-left:4px;">private IMarkerFactory <b>markerFactory</b>;</p><p style="margin:0px;margin-left:4px;">private LogbackMDCAdapter <b>mdcAdapter</b>;</p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-48" value="<font style="font-size: 12px;">从源码中提取出来的重要信息：<br style=""></font><ul style="font-size: 12px;"><li style=""><font style="font-size: 12px;">每个Logger实例都有且仅有一个唯一的名字，根 Logger 的名字是 ROOT</font></li><li style=""><font style="font-size: 12px;">Logger 之间是一种树型关系，树的根是 ROOT Logger</font></li><li style=""><font style="font-size: 12px;">各组件的关系：<br></font><b>Logger</b> 通过 <b>Appender</b> 输出日志；<b>Appender</b> 可以绑定多个 <b>Filter</b> 对日志事件（LoggingEvent）进行过滤（比如按日志级别选择输出）；<br>日志如果有参数输出前需要借助 MessageFormatter 格式化，还需要借助 <b>Encoder</b> 进行序列化；<br><b>Encoder</b> 中通过布局 <b>Layout</b> 控制日志序列化的格式 ；<br><b>Layout</b> 则是由一组 <b>Converter</b> 组成，用于将格式中每一个片段替换成具体的值 ( Logback 支持的所有 Pattern 片段及对应的 Converter 可以在 PatternLayout <b>DEFAULT_CONVERTER_MAP</b> 中查看 )。</li></ul>" style="text;html=1;align=left;verticalAlign=top;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;fontSize=10;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-49" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>LoggerContext&nbsp;</b><br></p><div style="text-align: center;">extends ContextBase implements <b>ILoggerFactory</b>, LifeCycle</div><hr size="1"><p style="margin:0px;margin-left:4px;"><b><font color="#007fff">Logger 上下文（Logger容器），且是 Logger 工厂</font></b></p><p style="margin:0px;margin-left:4px;"><b><font color="#007fff"><br></font></b></p><p style="margin:0px;margin-left:4px;"><font style="" color="#007fff">// 根 Logger, Logger 之间组成了一颗树，ROOT Logger 是这颗树的根节点</font></p><p style="margin:0px;margin-left:4px;">final Logger <b>root</b> = new Logger("ROOT", (Logger)null, this);</p><p style="margin:0px;margin-left:4px;">private int size;</p><p style="margin:0px;margin-left:4px;">private int noAppenderWarning = 0;</p><p style="margin:0px;margin-left:4px;">private final List&lt;LoggerContextListener&gt; loggerContextListenerList = new ArrayList();</p><p style="margin:0px;margin-left:4px;"><b><font color="#007fff">// Logger Name -&gt; Logger 实例</font></b></p><p style="margin:0px;margin-left:4px;">private Map&lt;String, Logger&gt; <b>loggerCache</b> = new ConcurrentHashMap();</p><p style="margin:0px;margin-left:4px;">private LoggerContextVO loggerContextRemoteView = new LoggerContextVO(this);</p><p style="margin:0px;margin-left:4px;"><font color="#007fff">//</font></p><p style="margin:0px;margin-left:4px;">private final TurboFilterList <b>turboFilterList</b> = new TurboFilterList();</p><p style="margin:0px;margin-left:4px;">private boolean packagingDataEnabled = false;</p><p style="margin:0px;margin-left:4px;">SequenceNumberGenerator sequenceNumberGenerator = null;</p><p style="margin:0px;margin-left:4px;">MDCAdapter mdcAdapter;</p><p style="margin:0px;margin-left:4px;">private int maxCallerDataDepth = 8;</p><p style="margin:0px;margin-left:4px;">int resetCount = 0;</p><p style="margin:0px;margin-left:4px;"></p><p style="margin:0px;margin-left:4px;">private List&lt;String&gt; frameworkPackages;</p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-51" value="<div><font color="#007fff">Logger 新建的逻辑，这段代码也挺重要，<b>对于理解Logger间的配置继承很重要</b></font></div><div>Logger logger = root;<br></div><div>...</div><div>String childName;</div><div>while (true) {</div><div>&nbsp; &nbsp; int h = LoggerNameUtil.getSeparatorIndexOf(name, i);</div><div>&nbsp; &nbsp; if (h == -1) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; childName = name;</div><div>&nbsp; &nbsp; } else {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; childName = name.substring(0, h);</div><div>&nbsp; &nbsp; }</div><div><span style="background-color: initial;"><br></span></div><div><span style="background-color: initial;">&nbsp; &nbsp; i = h + 1;</span><br></div><div>&nbsp; &nbsp; synchronized (logger) {</div><div><font color="#007fff"><span style="white-space: pre;">	</span>// 这里初始 logger 是 root logger, 这里先查下是否已创建，防止重复创建</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; childLogger = logger.<b>getChildByName</b>(childName);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; if (childLogger == null) {</div><div><font color="#007fff">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // 为 logger 创建一个子 Logger</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; childLogger = logger.<b>createChildByName</b>(childName);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; loggerCache.put(childName, childLogger);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; incSize();</div><div>&nbsp; &nbsp; &nbsp; &nbsp; }</div><div>&nbsp; &nbsp; }</div><div>&nbsp; &nbsp; logger = childLogger;</div><div>&nbsp; &nbsp; if (h == -1) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; return childLogger;</div><div>&nbsp; &nbsp; }</div><div>}</div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=3;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-53" value="<font color="#007fff"><b>比如这里创建名为&nbsp;top.kwseeker.labs.logging.LogbackExample 的 Logger, 实际上会创建 5个 Logger 实例<br>和 ROOT logger 共同组成一颗树： ROOT -&gt; top -&gt; top.kwseeker -&gt; ...<br></b></font><div style=""><div><font color="#007fff"><b>"top" -&gt; {Logger@2085} "Logger[top]"</b></font></div><div><font color="#007fff"><b>"top.kwseeker" -&gt; {Logger@2113} "Logger[top.kwseeker]"</b></font></div><div><font color="#007fff"><b>"top.kwseeker.labs" -&gt; {Logger@2143} "Logger[top.kwseeker.labs]"</b></font></div><div><font color="#007fff"><b>"top.kwseeker.labs.logging" -&gt; {Logger@2173} "Logger[top.kwseeker.labs.logging]"</b></font></div><div><font color="#007fff"><b>"top.kwseeker.labs.logging.LogbackExample" -&gt; {Logger@2202} "Logger[top.kwseeker.labs.logging.LogbackExample]"</b></font></div><div><br></div></div>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-54" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>Logger</b><br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b>Logger 实现，Logger 之间组成一颗树</b></font></p><p style="margin:0px;margin-left:4px;"><br></p><p style="margin:0px;margin-left:4px;">private String name;</p><p style="margin:0px;margin-left:4px;"><font color="#007fff">// Logger 日志级别</font></p><p style="margin:0px;margin-left:4px;">transient private Level <b>level</b>;</p><p style="margin:0px;margin-left:4px;"><font color="#007fff">// 继承的日志级别</font></p><p style="margin:0px;margin-left:4px;">transient private int <b>effectiveLevelInt</b>;</p><p style="margin:0px;margin-left:4px;"><font color="#007fff">// 指向父节点</font></p><p style="margin:0px;margin-left:4px;">transient private Logger <b>parent</b>;</p><p style="margin:0px;margin-left:4px;"><font color="#007fff">// 指向子节点</font></p><p style="margin:0px;margin-left:4px;">transient private List&lt;Logger&gt; <b>childrenList</b>;</p><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b>// 最重要的一个成员，记录与 Logger 绑定的 Appender 信息</b></font></p><p style="margin:0px;margin-left:4px;">transient private AppenderAttachableImpl&lt;ILoggingEvent&gt; <b>aai</b>;<br></p><p style="margin:0px;margin-left:4px;"><font color="#007fff">// 是否将日志输出到父Logger的 Appender</font></p><p style="margin:0px;margin-left:4px;">transient private boolean <b>additive</b> = true;<br></p><p style="margin:0px;margin-left:4px;">final transient LoggerContext <b>loggerContext</b>;<br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-57" value="<div><font color="#007fff"><b>// 1 TurboFilter 过滤校验</b></font></div><div>final FilterReply decision = <b>loggerContext</b><br>&nbsp; &nbsp; .<b>getTurboFilterChainDecision_0_3OrMore</b>(<span style="background-color: initial;">marker, this, level, msg,&nbsp;</span><span style="background-color: initial;">params, t);</span></div><div><br></div><div>if (decision == FilterReply.NEUTRAL) {</div><div>&nbsp; &nbsp; if (effectiveLevelInt &gt; level.levelInt) { <font color="#007fff">//经过过滤器后结果中立的话再判断下继承的可输出日志级别</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; return;</div><div>&nbsp; &nbsp; }</div><div>} else if (decision == FilterReply.DENY) {</div><div>&nbsp; &nbsp; return;</div><div>}</div><div><font color="#007fff"><b>// 2 输出日志</b></font></div><div><b>buildLoggingEventAndAppend</b>(localFQCN, marker, level, msg, params, t);</div>" style="rounded=1;whiteSpace=wrap;html=1;arcSize=4;align=left;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-59" value="<div>if (turboFilterList.size() == 0) {&nbsp;<font color="#007fff">// 如果没有设置过滤器，则过滤结果：中立</font></div><div>&nbsp; &nbsp; return FilterReply.NEUTRAL;&nbsp;</div><div>}</div><div><font color="#007fff">// 查找调用栈，发现只有 LogbackMetrics 有使用，暂略</font></div><div>return <b>turboFilterList</b>.getTurboFilterChainDecision(marker, logger, level, format, params, t);</div>" style="rounded=1;whiteSpace=wrap;html=1;arcSize=8;align=left;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-67" value="<div>int writes = 0;</div><div><font color="#007fff"><b>// 这里可以看到 Logback 先将日志输出到 Logger 对应的Appender, 然后如果设置了 additive == true 还会一级一级遍历父 logger 输出到对应的 Appender</b></font></div><div><b>for (Logger l = this; l != null; l = l.parent) {</b></div><div><b>&nbsp; &nbsp; <font color="#007fff">// 1</font></b></div><div>&nbsp; &nbsp; writes += l.<b>appendLoopOnAppenders</b>(event);</div><div>&nbsp; &nbsp; if (!l.additive) { <font color="#007fff">//对应配置中 logger 标签的 additivity 属性</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; break;</div><div>&nbsp; &nbsp; }</div><div>}</div><div><font color="#007fff">// 说明没有 Appender 接收日志输出</font></div><div>if (writes == 0) {</div><div>&nbsp; &nbsp; loggerContext.noAppenderDefinedWarning(this);</div><div>}</div>" style="rounded=1;whiteSpace=wrap;html=1;arcSize=5;align=left;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-69" value="<div><font color="#007fff">//将日志信息打印到当前 Logger 的 Appender, 如果没有 Appender的话当前Logger是不会打印的，而是一级一级往上遍历交给父 Logger 打印</font><br></div><div>if (aai != null) {</div><div>&nbsp; &nbsp; return <b>aai</b>.<b>appendLoopOnAppenders</b>(event);</div><div>} else {</div><div>&nbsp; &nbsp; return 0;</div><div>}</div>" style="rounded=1;whiteSpace=wrap;html=1;arcSize=5;align=left;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-71" value="<font color="#007fff"><b>这样实现的好处是可以复用父 Logger 的配置，比如测试中明明没有给名为 top.kwseeker.labs.logging.LogbackExample 的 Logger 配置 Appender, 为何还是可以打印出日志？</b><br><b>就是因为最终是通过 ROOT Logger 将日志打印出来的, Root Logger 的 Appender 信息是一定要配置的</b><br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-72" value="<div><div>int size = 0;</div><div>Appender&lt;E&gt;[] appenderArray = (Appender[])this.appenderList.asTypedArray();</div><div>int len = appenderArray.length;</div><div><font color="#007fff">// 一个 Logger 可能绑定多个 Appender</font></div><div>for(int i = 0; i &lt; len; ++i) {</div><div><b>&nbsp; &nbsp; appenderArray[i].doAppend(e);</b></div><div>&nbsp; &nbsp; ++size;</div><div>}</div><div>return size;</div></div>" style="rounded=1;whiteSpace=wrap;html=1;arcSize=5;align=left;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-74" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>AppenderAttachableImpl</b><br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b>记录与 Logger 绑定的 Appender 容器</b></font></p><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b><br></b></font></p><p style="margin:0px;margin-left:4px;"><font color="#007fff">// COWArrayList 是 Logback 重新封装的一个 COW 列表</font><br></p><p style="margin:0px;margin-left:4px;">private final COWArrayList&lt;Appender&lt;E&gt;&gt; <b>appenderList</b> = new COWArrayList(new Appender[0]);<br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-76" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>Appender （I）</b><br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b>日志输出目的地，可以理解为是一个 Writer, 有好几种实现</b></font></p><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b>比如：</b></font></p><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b>ConsoleAppender、A</b></font><b style="color: rgb(0, 127, 255); background-color: initial;">syncAppender、</b><b style="color: rgb(0, 127, 255); background-color: initial;">CyclicBufferAppender、OutputStreamAppender、FileAppender、RollingFileAppender、SMTPAppender、SyslogAppender 等等</b></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#d5e8d4;strokeColor=#82b366;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-78" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>ConsoleAppender</b><br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b>将日志输出到终端的Appender</b></font></p><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b><br></b></font></p><p style="margin:0px;margin-left:4px;">protected ConsoleTarget target;</p><p style="margin:0px;margin-left:4px;">protected boolean withJansi;</p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-79" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>OutputStreamAppender</b><br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b>// LoggingEvent 编码器，用于将&nbsp;</b></font><font color="#007fff"><b>&nbsp;LoggingEvent 序列化</b></font></p><p style="margin:0px;margin-left:4px;">protected Encoder&lt;E&gt; <b>encoder</b>;</p><p style="margin:0px;margin-left:4px;">protected final ReentrantLock lock = new ReentrantLock(false);</p><p style="margin:0px;margin-left:4px;">private OutputStream outputStream;</p><p style="margin:0px;margin-left:4px;">boolean immediateFlush = true;</p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-81" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>UnsynchronizedAppenderBase&nbsp;</b><br></p><div style="text-align: center;">extends ContextAwareBase implements Appender&lt;E&gt;&nbsp;</div><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b><br></b></font></p><p style="margin:0px;margin-left:4px;">protected boolean started = false;</p><p style="margin:0px;margin-left:4px;">private ThreadLocal&lt;Boolean&gt; guard = new ThreadLocal();</p><p style="margin:0px;margin-left:4px;">protected String name;</p><p style="margin:0px;margin-left:4px;"><b><font color="#007fff">// 与 Appender 绑定的过滤器列表</font></b></p><p style="margin:0px;margin-left:4px;">private <b>FilterAttachableImpl</b>&lt;E&gt; <b>fai</b> = new FilterAttachableImpl();</p><p style="margin:0px;margin-left:4px;">private int statusRepeatCount = 0;</p><p style="margin:0px;margin-left:4px;">private int exceptionCount = 0;</p><p style="margin:0px;margin-left:4px;">static final int ALLOWED_REPEATS = 3;</p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;" parent="1" vertex="1">
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<mxCell id="jevOpthSYDo48ZPv_LFc-84" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>FileAppender</b><br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b>将日志输出到文件的Appender</b></font></p><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b><br></b></font></p><p style="margin:0px;margin-left:4px;">public static final long DEFAULT_BUFFER_SIZE = 8192L;</p><p style="margin:0px;margin-left:4px;">protected static String COLLISION_WITH_EARLIER_APPENDER_URL = "http://logback.qos.ch/codes.html#earlier_fa_collision";</p><p style="margin:0px;margin-left:4px;">protected boolean append = true;</p><p style="margin:0px;margin-left:4px;">protected String fileName = null;</p><p style="margin:0px;margin-left:4px;">private boolean prudent = false;</p><p style="margin:0px;margin-left:4px;">private FileSize bufferSize = new FileSize(8192L);</p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-40" value="<div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;"><b style="font-size: 10px;">// 遍历执行 Converter 链表中的 Converter 按照 Pattern 格式生成</b></font><font color="#007fff" style="font-size: 10px;"><b style="font-size: 10px;">日志消息</b></font></div><div style="font-size: 10px;">String txt = this.<b style="font-size: 10px;">layout</b>.<b style="font-size: 10px;">doLayout</b>(event);<br style="font-size: 10px;"></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">// 字符串转成字节数组</font></div><div style="font-size: 10px;">return this.<b style="font-size: 10px;">convertToBytes</b>(txt);<br style="font-size: 10px;"></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=10;fontSize=10;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-42" value="<div style="text-align: center;"><b>Layout</b><b style="background-color: initial;">&nbsp;(I)</b></div><hr size="1"><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b>布局, 用于控制日志输出的组成</b></font></p><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b><br></b></font></p><p style="margin:0px;margin-left:4px;">String doLayout(E var1);</p><p style="margin:0px;margin-left:4px;">String getFileHeader();</p><p style="margin:0px;margin-left:4px;">String getPresentationHeader();</p><p style="margin:0px;margin-left:4px;">String getPresentationFooter();</p><p style="margin:0px;margin-left:4px;">String getFileFooter();</p><p style="margin:0px;margin-left:4px;">String getContentType();</p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#d5e8d4;strokeColor=#82b366;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-48" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>PatternLayout</b><br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><b><font color="#007fff">保存了所有Logback 支持的 Pattern 片段以及对应的 Converter</font></b></p><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b><br></b></font></p><p style="margin:0px;margin-left:4px;">public static final Map&lt;String, String&gt; DEFAULT_CONVERTER_MAP = new HashMap&lt;String, String&gt;();</p><p style="margin:0px;margin-left:4px;">public static final Map&lt;String, String&gt; CONVERTER_CLASS_TO_KEY_MAP = new HashMap&lt;String, String&gt;();</p><p style="margin:0px;margin-left:4px;">public static final Map&lt;String, String&gt; <b>defaultConverterMap</b> = DEFAULT_CONVERTER_MAP;<br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-55" value="<div style="font-size: 10px;"><div style="font-size: 10px;"><div>StringBuilder strBuilder = new StringBuilder(256);</div><div><font color="#007fff"><b>// PatternLayout 中包含了一组 Converter， head 指向 Converter链表中第一个 Converter</b></font></div><div>for(Converter&lt;E&gt; c = this.<b>head</b>; c != null; c = c.getNext()) {</div><div>&nbsp; &nbsp; c.<b>write</b>(strBuilder, event); <font color="#007fff">//转换Pattern中每一部分值附加到StringBuilder</font></div><div>}</div><div>return strBuilder.toString();</div></div></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=10;fontSize=10;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-59" value="<div style="text-align: center;"><b>Converter (A)</b><span style="background-color: initial;">&nbsp;</span></div><hr size="1"><p style="margin:0px;margin-left:4px;"><b><font color="#007fff">转换器，用于将布局中%开头的字段替换为具体的值，有几十种实现</font></b></p><p style="margin:0px;margin-left:4px;"><br></p><p style="margin:0px;margin-left:4px;"><font color="#007fff">// 单向链表的形式</font></p><p style="margin:0px;margin-left:4px;">Converter&lt;E&gt; next;<br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><font color="#007fff">// 过滤逻辑的实现方法</font></p><p style="margin:0px;margin-left:4px;">public abstract FilterReply <b>decide</b>(E var1);<br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#d5e8d4;strokeColor=#82b366;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-71" value="<font color="#007fff"><b>比如&nbsp;&lt;pattern&gt;%d{yy-MM-dd.HH:mm:ss.SSS} [%-16t] %-5p %-22c{0}%X{ServiceId} -%X{trace-id} %m%n&lt;/pattern&gt; 配置会被解析为一组 Converter 链表<br>链表从头到尾依次是：<br>DateConverter -&gt; LiteralConverter -&gt; ThreadConverter -&gt; LiteralConverter -&gt; LevelConverter -&gt; LiteralConverter -&gt; LoggerConverter -&gt; MDCConverter -&gt;&nbsp;<br>LiteralConverter -&gt;&nbsp;MDCConverter -&gt;&nbsp;LiteralConverter -&gt; MessageConverter -&gt; LineSeparatorConverter -&gt; ThrowableProxyConverter</b></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-72" value="<font color="#007fff"><b>比如&nbsp;&lt;pattern&gt;%d{yy-MM-dd.HH:mm:ss.SSS} [%-16t] %-5p %-22c{0}%X{ServiceId} -%X{trace-id} %m%n&lt;/pattern&gt; 配置会被解析为一组 Converter 链表<br>链表从头到尾依次是：<br>DateConverter -&gt; LiteralConverter -&gt; ThreadConverter -&gt; LiteralConverter -&gt; LevelConverter -&gt; LiteralConverter -&gt; LoggerConverter -&gt; MDCConverter -&gt;&nbsp;<br>LiteralConverter -&gt;&nbsp;MDCConverter -&gt;&nbsp;LiteralConverter -&gt; MessageConverter -&gt; LineSeparatorConverter -&gt; ThrowableProxyConverter</b></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-87" style="edgeStyle=orthogonalEdgeStyle;rounded=1;orthogonalLoop=1;jettySize=auto;html=1;exitX=1;exitY=0.5;exitDx=0;exitDy=0;entryX=0;entryY=0.5;entryDx=0;entryDy=0;" parent="1" source="I5ocxiANe00BZeKkWwZh-73" target="I5ocxiANe00BZeKkWwZh-83" edge="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-73" value="<div>一个 Layout Pattern 被解析为 Converter 链表后，通常会包含多种Converter 实现，这里展示几种较为重要的实现</div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=10;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-74" value="<div><b>DateConverter</b>#write(...)</div>" style="rounded=1;whiteSpace=wrap;html=1;align=center;arcSize=10;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-76" value="<b>ThreadConverter</b><span style="background-color: initial;">#write(...)</span><b><br></b>" style="rounded=1;whiteSpace=wrap;html=1;align=center;arcSize=10;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-78" value="<span style="background-color: initial;"><b>LevelConverter</b>#write(...)</span><b><br></b>" style="rounded=1;whiteSpace=wrap;html=1;align=center;arcSize=10;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-80" value="<span style="background-color: initial;"><b>LoggerConverter</b>#write(...)<br></span><b><font color="#007fff">用于打印FQN(Logger类全限定名)中<br>的类名</font><br></b>" style="rounded=1;whiteSpace=wrap;html=1;align=center;arcSize=10;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-81" value="<span style="background-color: initial;"><b>MDCConverter</b>#write(...)<br></span><b><font color="#007fff">转换MDC属性占位符</font><br></b>" style="rounded=1;whiteSpace=wrap;html=1;align=center;arcSize=10;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-82" value="<span style="background-color: initial;"><b>MessageConverter</b>#write(...)</span><b><br></b>" style="rounded=1;whiteSpace=wrap;html=1;align=center;arcSize=10;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-83" value="<span style="background-color: initial;"><b>ThrowableProxyConverter</b>#write(...)<br></span><b><font color="#007fff">处理异常信息，递归遍历异常栈转成String, 然后格式化追加到 StringBuilder</font><br></b>" style="rounded=1;whiteSpace=wrap;html=1;align=center;arcSize=10;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-88" value="long timestamp = le.<b>getTimeStamp</b>();<br>return cachingDateFormatter<br>.format(timestamp);" style="rounded=1;whiteSpace=wrap;html=1;align=center;arcSize=10;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-90" value="<font color="#007fff">用于转换 %d, 比如测试中的 %d{yy-MM-dd.HH:mm:ss.SSS}，<br>从 LoggingEvent 获取日志时间戳使用 CachingDateFormatter 转换成&nbsp;yy-MM-dd.HH:mm:ss.SSS 格式</font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-91" value="<font color="#007fff">用于转换 %t, 比如测试中的 %-16t，<br>从 LoggingEvent 获取线程名，然后经过最小宽度16左对齐处理后，追加到 StringBuilder<br>比如线程名 “main” 格式化处理后是 “main&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ”, 后边12位填充空格<br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-92" value="<div><font color="#007fff">关于格式信息，比如 %-16t&nbsp;</font></div><div><font color="#007fff">this.formattingInfo = {FormatInfo@2284}</font></div><div><font color="#007fff">&nbsp;min = 16 //最小宽度</font></div><div><font color="#007fff">&nbsp;max = 2147483647 //最大宽度</font></div><div><font color="#007fff">&nbsp;leftPad = false<span style="white-space: pre;">	</span>//是否左边填充空格</font></div><div><font color="#007fff">&nbsp;leftTruncate = true&nbsp; //是否删除左边溢出的字符</font></div>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-93" value="<font color="#007fff">用于转换 %p, 比如测试中的 %-5p，<br>从 LoggingEvent 获取日志级别名，然后经过最小宽度5左对齐处理后，追加到 StringBuilder<br>比如日志事件级别 “INFO” 格式化处理后是 “INFO ”<br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-94" value="<font color="#007fff">用于转换 %c, 比如测试中的 %-22c{0}，<br>从 LoggingEvent 获取Logger 名，截取类名，然后经过最小宽度22左对齐处理后，追加到 StringBuilder<br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-95" value="<font color="#007fff">用于转换 %X, 比如测试中的 %X{ServiceId} %X{trace-id}，<br>从 LoggingEvent 获取mdcPropertyMap，根据占位符key读取值替换占位符，关键是看 mdcPropertyMap 中的值是怎么写进去的，TODO<br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="I5ocxiANe00BZeKkWwZh-96" value="<font color="#007fff">用于转换 %m,&nbsp;<br>从 LoggingEvent 获取 formattedMessage (这个值是前面prepareForDeferredProcessing中转换完成的)，追加到 StringBuilder<br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-2" value="<font style="" color="#007fff">用于转换异常信息,&nbsp;</font><span style="border-color: var(--border-color); text-align: center;"><font style="border-color: var(--border-color);" color="#007fff">，<br>异常并不会被 MessageConverter 处理直接加入 formattedMessage, 而是由此转换器递归遍历异常栈生成异常信息(String)</font></span><font color="#007fff">，然后格式化追加到 StringBuilder<br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-3" value="log.error(..., e);<br><font color="#007fff"><b>带有异常的日志输出流程</b>，异常会被保存到 LoggingEvent 最终由&nbsp;<b>ThrowableProxyConverter </b>处理</font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-5" value="log.info("info message: {}", "hello");<br style="font-size: 11px;"><font color="#007fff" style=""><b>带有参数的日志输出流程</b>，参数同样保存到 LoggingEvent, 最终在&nbsp;<b>DeferredProcessingAware</b>#<br><b>prepareForDeferredProcessing</b>() 处理</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=11;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-7" value="<font color="#007fff">// 1</font><br>MDC.put("trace-id", "10001");<br>log.info("info message with mdc ...");<br><b style="color: rgb(0, 127, 255);">带有MDC参数的日志输出流程</b>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=11;fillColor=#dae8fc;strokeColor=#6c8ebf;align=left;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-13" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=1;orthogonalLoop=1;jettySize=auto;html=1;" edge="1" parent="1" source="xc-GYIRrwOv2HIxgL6Iq-9" target="xc-GYIRrwOv2HIxgL6Iq-12">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-9" value="mdcAdapter.put(key, val);<br><font color="#007fff">从后面可以看到本质就是<b>通过 ThreadLocal 传参</b></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=11;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-15" style="edgeStyle=orthogonalEdgeStyle;rounded=1;orthogonalLoop=1;jettySize=auto;html=1;exitX=0;exitY=0.5;exitDx=0;exitDy=0;endArrow=open;endFill=0;" edge="1" parent="1" source="xc-GYIRrwOv2HIxgL6Iq-11" target="xc-GYIRrwOv2HIxgL6Iq-14">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-11" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>MDC</b><br></p><hr size="1"><p style="margin:0px;margin-left:4px;"></p><font color="#007fff"><b>&nbsp;MDC (Mapped Diagnostic Context) 用来添加额外的上下文信息到日志</b></font><p style="margin:0px;margin-left:4px;"><br></p><p style="margin:0px;margin-left:4px;">static MDCAdapter <b>mdcAdapter</b>;<br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-12" value="<div>Map&lt;String, String&gt; current = <b>readWriteThreadLocalMap</b>.get();</div><div>if (current == null) {</div><div>&nbsp; &nbsp; current = new HashMap&lt;String, String&gt;();</div><div>&nbsp; &nbsp; readWriteThreadLocalMap.set(current);</div><div>}</div><div>current.<b>put</b>(key, val);</div><div>nullifyReadOnlyThreadLocalMap();</div>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=11;align=left;arcSize=6;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-14" value="<p style="margin:0px;margin-top:4px;text-align:center;"><b>LogbackMDCAdapter</b><br></p><hr size="1"><p style="margin:0px;margin-left:4px;"><font color="#007fff"><b>MDCAdapter 的 Logback 实现，从下面可以看到，本质就是通过 ThreadLocal 传参</b></font></p><p style="margin:0px;margin-left:4px;"><span style="color: rgb(0, 127, 255); background-color: initial;">&nbsp;</span><br></p><p style="margin:0px;margin-left:4px;">final <b>ThreadLocal</b>&lt;Map&lt;String, String&gt;&gt; readWriteThreadLocalMap = new ThreadLocal&lt;Map&lt;String, String&gt;&gt;();</p><p style="margin:0px;margin-left:4px;">final <b>ThreadLocal</b>&lt;Map&lt;String, String&gt;&gt; readOnlyThreadLocalMap = new ThreadLocal&lt;Map&lt;String, String&gt;&gt;();</p><p style="margin:0px;margin-left:4px;">private final <b>ThreadLocalMapOfStacks</b> threadLocalMapOfDeques = new ThreadLocalMapOfStacks();</p><hr size="1"><p style="margin:0px;margin-left:4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-17" value="<font color="#007fff"><b>Logback 实现 MDC 的原理很简单：<br>就是通过 ThreadLocal 传递自定义信息，<br>后面进行序列化编码时由 MDCConverter 从&nbsp; ThreadLocal 将值取出来<br>追加到 StringBuilder 后面</b><br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-18" value="<b>Skywalking TraceId Layout 实现</b><br><b>TraceIdPatternLogbackLayout</b>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#1ba1e2;strokeColor=#006EAF;fontColor=#ffffff;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-22" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=1;orthogonalLoop=1;jettySize=auto;html=1;dashed=1;" edge="1" parent="1" source="xc-GYIRrwOv2HIxgL6Iq-19" target="xc-GYIRrwOv2HIxgL6Iq-21">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-19" value="<div><div>public class TraceIdPatternLogbackLayout extends PatternLayout {</div><div>&nbsp; &nbsp; static {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; defaultConverterMap.put("tid", LogbackPatternConverter.class.getName());</div><div>&nbsp; &nbsp; &nbsp; &nbsp; defaultConverterMap.put("sw_ctx", LogbackSkyWalkingContextPatternConverter.class.getName());</div><div>&nbsp; &nbsp; }</div><div>}</div></div><div><font color="#007fff">实现挺简单仅仅是在 Logback PatternLayout 基础上额外添加了两个Converter， 这里只关注 LogbackPatternConverter，用于转换 %tid 占位符</font></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=4;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-21" value="<b>LogbackPatternConverter</b>#write(...)<br><font color="#007fff">LogbackPatternConverter继承 ClassicConverter, 仅仅重写了 convert() 方法</font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-23" value="<font color="#007fff">通过这个类在日志中插入 Skywalking <br>TraceId类位于 skywalking-java&nbsp;<br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-26" value="<font color="#007fff"><b>但是 convert() 方法实现只是返回 "TID: N/A" ？</b><b>那么实际使用时替换占位符 %tid 的值哪里来的？</b><br><b>推测业务实际使用时可能 Skywalking JavaAgent 将这个 LogbackPatternConverter 类增强了，</b><b>修改了 convert() 方法的实现</b><br>从 Skywalking JavaAgent 原理可知是通过加载 plugins 中的 XxxInstrumentation 实现修改服务中的类的，<br>如果上面猜想不错，应该也有一个对应的 Instrumentation 类修改 LogbackPatternConverter, 搜索源码找到了 <b>LogbackPatternConverterActivation</b> （虽然不是 Imstrumentation 结尾的，但确实是这个）<br>包路径是 apm-sniffer/apm-toolkit-activation/apm-toolkit-logback-1.x-activation/src/main/java/org/apache/skywalking/apm/toolkit/activation/log/logback/v1/x/LogbackPatternConverterActivation.java<br><b>看了下实现和猜想一致<br></b><div>&nbsp; &nbsp; public static final String <b>INTERCEPT_CLASS</b> = "org.apache.skywalking.apm.toolkit.activation.log.logback.v1.x.<b>PrintTraceIdInterceptor</b>"; <b>//增强逻辑所在的类</b></div><div>&nbsp; &nbsp; public static final String <b>ENHANCE_CLASS</b> = "org.apache.skywalking.apm.toolkit.log.logback.v1.x.<b>LogbackPatternConverter</b>";</div><div>&nbsp; &nbsp; public static final String <b>ENHANCE_METHOD</b> = "<b>convert</b>";</div><div><br></div></font>" style="text;html=1;align=left;verticalAlign=top;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-27" value="<b>PrintTraceIdInterceptor#afterMethod()</b><br><font color="#007fff">实际引入 JavaAgent 后 convert() 被重写，调用此拦截器</font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;fontSize=11;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-31" value="<div>if (!ContextManager.isActive()) {</div><div>&nbsp; &nbsp; if (allArguments[0] instanceof EnhancedInstance) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; SkyWalkingContext skyWalkingContext = (SkyWalkingContext) ((EnhancedInstance) allArguments[0]).getSkyWalkingDynamicField();</div><div>&nbsp; &nbsp; &nbsp; &nbsp; if (skyWalkingContext != null) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return "TID:" + skyWalkingContext.getTraceId();</div><div>&nbsp; &nbsp; &nbsp; &nbsp; }</div><div>&nbsp; &nbsp; }</div><div>}</div><div><b><font color="#007fff">// ContextManager 中存储的是链路追踪上下文，也包括TraceId</font></b></div><div>return "TID:" + <b>ContextManager</b>.<b>getGlobalTraceId</b>();</div>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=11;align=left;arcSize=5;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-34" value="<div style="font-size: 12px;"></div><div style="font-size: 12px;"><font color="#007fff" style="font-size: 12px;">// xml配置初始化默认是通过 DefaultJoranConfigurator 实现</font></div><div style="font-size: 12px;"><b style="font-size: 12px;">DefaultJoranConfigurator</b></div><div style="font-size: 12px;">#configure(...)<br style="font-size: 12px;"></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=10;fontSize=12;fillColor=#ffe6cc;strokeColor=#d79b00;" vertex="1" parent="1">
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<mxCell id="xc-GYIRrwOv2HIxgL6Iq-39" value="<font color="#007fff"><b>XML 配置解析为LoggerContext中的组件在这里面完成<br>这里面的代码还是有点复杂的，也比较杂<br><div style=""><b style="background-color: initial;">但是不妨碍理解 Logback 工作原理，暂略</b></div></b></font>" style="text;html=1;align=left;verticalAlign=top;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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