Dropwizard自定義AppenderFactory不被識別

Question

我想爲Splunk HTTP事件收集器實現自定義AppenderFactory。我寫了一個簡單的類，如下所示，

package com.example.app; 

import ch.qos.logback.classic.LoggerContext; 
import ch.qos.logback.classic.spi.ILoggingEvent; 
import ch.qos.logback.core.Appender; 
import ch.qos.logback.core.AppenderBase; 
import com.fasterxml.jackson.annotation.JsonTypeName; 
import io.dropwizard.logging.AbstractAppenderFactory; 
import io.dropwizard.logging.async.AsyncAppenderFactory; 
import io.dropwizard.logging.filter.LevelFilterFactory; 
import io.dropwizard.logging.layout.LayoutFactory; 

@JsonTypeName("splunk") 
public class SplunkAppenderFactory extends AbstractAppenderFactory{ 

    @Override 
    public Appender build(LoggerContext context, String applicationName, LayoutFactory layoutFactory, LevelFilterFactory levelFilterFactory, AsyncAppenderFactory asyncAppenderFactory) { 
     System.out.println("Setting up SplunkAppenderFactory!"); 
     final SplunkAppender appender = new SplunkAppender(); 
     appender.setName("splunk-appender"); 
     appender.setContext(context); 
     appender.start(); 

     return wrapAsync(appender, asyncAppenderFactory); 
    } 
} 

class SplunkAppender extends AppenderBase<ILoggingEvent> { 

    @Override 
    protected void append(ILoggingEvent eventObject) { 
     System.out.println("Splunk: "+ eventObject.toString()); 
    } 
} 

有人說，我們沒有做接線什麼，因爲Dropwizard會自動掃描和電線的東西。但是，當我運行應用程序，我得到這個錯誤，

./infrastructure/config/config.yml has an error: * Failed to parse configuration at: logging.appenders.[2]; Could not resolve type id 'splunk' into a subtype of [simple type, class io.dropwizard.logging.AppenderFactory]: known type ids = [AppenderFactory, console, file, syslog] at [Source: N/A; line: -1, column: -1] (through reference chain: com.example.app.AppConfiguration["logging"]->io.dropwizard.logging.DefaultLoggingFactory["appenders"]->java.util.ArrayList[2])

我的app.config如下，

logging: 
    appenders: 
     # log format: <Level> - <Time> - <Revision> - <Environment> - <Thread> - <Log Content> 
     - type: console 
     logFormat: "%level %d{HH:mm:ss.SSS} %mdc{revision} %mdc{environment} '%mdc{user}' %t %logger{5} - %X{code} %msg %n" 
     threshold: ${CONSOLE_LOG_LEVEL:-ERROR} 
     - type: file 
     threshold: INFO 
     logFormat: "%level %d{HH:mm:ss.SSS} %mdc{revision} %mdc{environment} '%mdc{user}' %t %logger{5} - %X{code} %msg %n" 
     # The file to which current statements will be logged. 
     currentLogFilename: ./logs/app.log 
     # When the log file rotates, the archived log will be renamed to this and gzipped. The 
     # %d is replaced with the previous day (yyyy-MM-dd). Custom rolling windows can be created 
     # by passing a SimpleDateFormat-compatible format as an argument: "%d{yyyy-MM-dd-hh}". 
     archivedLogFilenamePattern: ./logs/app-%d.log.gz 
     # The number of archived files to keep. 
     archivedFileCount: 10 
     # The timezone used to format dates. HINT: USE THE DEFAULT, UTC. 
     timeZone: UTC 
     - type: splunk 
     logFormat: "%level %d{HH:mm:ss.SSS} %mdc{revision} %mdc{environment} '%mdc{user}' %t %logger{5} - %X{code} %msg %n" 
     threshold: INFO 

我怎樣才能得到這個工作？

Answer 1

您可能需要創建一個文件名爲：

META-INF/services/io.dropwizard.logging.AppenderFactory 

在項目的資源文件夾，這個文件的內容是追加程序類的完全限定域名（或類）可供選擇：

com.example.app.SplunkAppenderFactory 

核心DW項目還包括這個文件用默認的appender：

https://github.com/dropwizard/dropwizard/blob/v1.1.0/dropwizard-logging/src/main/resources/META-INF/services/io.dropwizard.logging.AppenderFactory