Introduction to evaluatorfilter

from :

EvaluatorFilter Introduction

The following is about EvaluatorFilter Introduction to , As shown below :

EvaluatorFilter: It's the evaluation filter   Then evaluate 、 Identify whether the log meets the specified conditions  

EvaluatorFilter attribute

<evaluator>: Discriminator , The common discriminator is JaninoEventEvaluato, It's also the default discriminator 
    It takes arbitrary java Boolean expression as evaluation condition 
     The evaluation condition was interpreted in the configuration file and was compiled dynamically , Boolean expression returns true It means that the filtering conditions are met 
	evaluator There are sub tags <expression>: Used to configure evaluation conditions 
<onMatch>: It is used to configure the operations that meet the filtering conditions 
<onMismatch>: Used to configure operations that do not meet the filter criteria 

example

// Filter out all log messages that do not contain “billing” Log of string 
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">   
<filter class="ch.qos.logback.core.filter.EvaluatorFilter">         
  <evaluator> <!--  The default is  ch.qos.logback.classic.boolex.JaninoEventEvaluator -->   
	<expression>return message.contains("billing");</expression>   
  </evaluator>   
  <OnMatch>ACCEPT </OnMatch>  
  <OnMismatch>DENY</OnMismatch>  
</filter>   
<encoder>   
  <pattern>   
	%-4relative [%thread] %-5level %logger - %msg%n   
  </pattern>   
</encoder>   
</appender>