logback使用MDCFilter日志过滤源码解读
作者：codecraft
这篇文章主要介绍了logback使用MDCFilter日志过滤源码解读,有需要的朋友可以借鉴参考下,希望能够有所帮助,祝大家多多进步,早日升职加薪
序
本文主要研究一下logback的MDCFilter
MatchingFilter
ch/qos/logback/classic/turbo/MatchingFilter.java
public abstract class MatchingFilter extends TurboFilter {
protected FilterReply onMatch = FilterReply.NEUTRAL;
protected FilterReply onMismatch = FilterReply.NEUTRAL;
final public void setOnMatch(String action) {
if ("NEUTRAL".equals(action)) {
onMatch = FilterReply.NEUTRAL;
} else if ("ACCEPT".equals(action)) {
onMatch = FilterReply.ACCEPT;
} else if ("DENY".equals(action)) {
onMatch = FilterReply.DENY;
}
}
final public void setOnMismatch(String action) {
if ("NEUTRAL".equals(action)) {
onMismatch = FilterReply.NEUTRAL;
} else if ("ACCEPT".equals(action)) {
onMismatch = FilterReply.ACCEPT;
} else if ("DENY".equals(action)) {
onMismatch = FilterReply.DENY;
}
}
}MatchingFilter继承了TurboFilter，它提供了setOnMatch及setOnMismatch方法，它们在action为NEUTRAL、ACCEPT、DENY时设置对应的onMatch、onMismatch
MDCFilter
ch/qos/logback/classic/turbo/MDCFilter.java
public class MDCFilter extends MatchingFilter {
String MDCKey;
String value;
@Override
public void start() {
int errorCount = 0;
if (value == null) {
addError("\'value\' parameter is mandatory. Cannot start.");
errorCount++;
}
if (MDCKey == null) {
addError("\'MDCKey\' parameter is mandatory. Cannot start.");
errorCount++;
}
if (errorCount == 0)
this.start = true;
}
@Override
public FilterReply decide(Marker marker, Logger logger, Level level, String format, Object[] params, Throwable t) {
if (!isStarted()) {
return FilterReply.NEUTRAL;
}
String value = MDC.get(MDCKey);
if (this.value.equals(value)) {
return onMatch;
}
return onMismatch;
}
public void setValue(String value) {
this.value = value;
}
public void setMDCKey(String MDCKey) {
this.MDCKey = MDCKey;
}
}MDCFilter继承了MatchingFilter，其start方法校验MDCKey及value属性是否有值，其decide方法跟从MDC获取指定key的值，然后判断该值域value是否相等，相等则返回onMatch，否则返回onMismatch
示例
<?xml version="1.0" encoding="UTF-8" ?>
<configuration>
<turboFilter class="ch.qos.logback.classic.turbo.MDCFilter">
<MDCKey>username</MDCKey>
<Value>sebastien</Value>
<OnMatch>ACCEPT</OnMatch>
</turboFilter>
<turboFilter class="ch.qos.logback.classic.turbo.MarkerFilter">
<Marker>billing</Marker>
<OnMatch>DENY</OnMatch>
</turboFilter>
<appender name="console" class="ch.qos.logback.core.ConsoleAppender">
<layout class="ch.qos.logback.classic.PatternLayout">
<Pattern>%date [%thread] %-5level %logger - %msg%n</Pattern>
</layout>
</appender>
<root level="info">
<appender-ref ref="console" />
</root>
</configuration>小结
logback提供了MDCFilter，它可以根据指定的MDCKey从MDC取值，然后根据配置的value进行判断，然后执行onMatch或者onMismatch来决定是否打印日志。
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