Introduction to logback filter

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logback filter Filter introduction

The following is about logback in filter Introduction and description of filter , As shown below ：

Logback Two types are available Filter Regular Filter; Turbo Filter

Regular Filter be used for appeder On
Appender An instance can be bound Regular Filter Instance chain
Regular Filter Inheritance implementation ”ch.qos.logback.core.filter.Filter” class
Customize your own regular filter Need to inherit ch.qos.logback.core.filter.Filter class , And implement decide() Method

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TurboFilter Object bound to logging context
Available for a given appender Call them when
Log requests are issued every time
It can be found in LoggingEvent Called before the object is created
TurboFilter Object does not need to instantiate logging events to filter logging requests
turbo Filters are designed for high-performance filtering of recorded events , Even before creating the event
To implement this type of filter Need to inherit ch.qos.logback.classic.turbo.TurboFilter

logback There is 3 A common filter

LevelFilter
 Grade filter , Filter by log level 
  When the log level is equal to the configuration level , The filter will be based on onMath  and  onMismatch Receive or reject logs 

LevelFilter Filter events based on precise level matching 
  When the level of the event is equal to the configured level , The filter accepts or rejects the event , Depending on onMatch and onMismatch Configuration of properties  

EvaluatorFilter
 Evaluation filters , assessment 、 Identify whether the log meets the specified conditions  

EventEvaluator Will evaluate whether a given event meets a given condition 
  In case of match and mismatch , trusteeship EvaluatorFilter Will be returned separately onMatch or onMismatch Property 
  Please note that ,EventEvaluator Is an abstract class . You can do this by EventEvaluator Subclass to implement your own event evaluation logic 

ThresholdFilter
   Threshold filter , Filter out logs below the specified threshold . When the log level is equal to or higher than the threshold , Filter return NEUTRAL; When the log level is below the threshold , Logs will be rejected 
ThresholdFilter Filter events below the specified threshold . For events equal to or above the threshold ,ThresholdFilter Will call its decision（） Method response NEUTRAL
  But events with a level below the threshold will be rejected