logback的LevelFilter日志过滤器源码解读
作者：codecraft
这篇文章主要为大家介绍了logback的LevelFilter日志过滤器源码解读，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LevelFilter
AbstractMatcherFilter
ch/qos/logback/core/filter/AbstractMatcherFilter.java
public abstract class AbstractMatcherFilter<E> extends Filter<E> {
protected FilterReply onMatch = FilterReply.NEUTRAL;
protected FilterReply onMismatch = FilterReply.NEUTRAL;
final public void setOnMatch(FilterReply reply) {
this.onMatch = reply;
}
final public void setOnMismatch(FilterReply reply) {
this.onMismatch = reply;
}
final public FilterReply getOnMatch() {
return onMatch;
}
final public FilterReply getOnMismatch() {
return onMismatch;
}
}AbstractMatcherFilter继承了Filter，它定义了onMatch及onMismatch属性
LevelFilter
ch/qos/logback/classic/filter/LevelFilter.java
public class LevelFilter extends AbstractMatcherFilter<ILoggingEvent> {
Level level;
@Override
public FilterReply decide(ILoggingEvent event) {
if (!isStarted()) {
return FilterReply.NEUTRAL;
}
if (event.getLevel().equals(level)) {
return onMatch;
} else {
return onMismatch;
}
}
public void setLevel(Level level) {
this.level = level;
}
public void start() {
if (this.level != null) {
super.start();
}
}
}LevelFilter继承了AbstractMatcherFilter，其decide判断event的level等级是否与配置的level一致，一致则返回onMatch，否则返回onMismatch
示例
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>ERROR</level>
<onMatch>ACCEPT</onMatch>
<onMismatch>DENY</onMismatch>
</filter>
<encoder>
<pattern>${CONSOLE_LOG_PATTERN}</pattern>
</encoder>
</appender>这里CONSOLE的appender定义了LevelFilter，当level为ERROR级别时ACCEPT，否则DENY
小结
logback提供了LevelFilter，可以配置指定的level、onMatch、onMismatch属性，用于设置指定appender的打印级别。
以上就是logback的LevelFilter的详细内容，更多关于logback的LevelFilter的资料请关注脚本之家其它相关文章！