log4j - Dropwizard 中默认记录到文件和控制台是否使用 AsyncAppender？

Question

在我的 DW 应用程序中，我试图使文件和控制台的日志记录异步。我发现我可以使用 AsyncAppender，但是它是否已在 DropWizard 中配置，或者我是否需要启用它，如果是这样，我如何配置记录器以使用 AsyncAppender

Logger root = (Logger)   LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);
AsyncAppender fileAppender = (AsyncAppender) root.getAppender("async-file-appender");

我的 config.yaml 看起来像这样

server:
  minThreads: 512
  type: default
supportedCarParcFile: /opt/foo/my_app/config/my-app.json

logging:  
  appenders:  
    -  
      threshold: INFO  
      type: console  
    -  
      archivedFileCount: 7  
      archivedLogFilenamePattern: /opt/foo/my_app/logs/my-app-%d.log.gz  
      currentLogFilename: /opt/foo/my_app/logs/my-app.log  
      threshold: INFO  
      timeZone: CST  
      type: file  
    -  
      archivedFileCount: 7  
      archivedLogFilenamePattern: /opt/foo/my_app/logs/my-app_error-%d.log.gz  
      currentLogFilename: /opt/foo/my_app/logs/my-app_error.log  
      threshold: ERROR  
      timeZone: CST  
      type: file  
  loggers:  
    metrics:  
      additive: true  
      appenders:  
        -  
          archivedFileCount: 10  
          archivedLogFilenamePattern: /opt/foo/my_app/logs/metrics-%d.log.gz  
          currentLogFilename: /opt/foo/my_app/logs/metrics.log  
          type: file  
      level: INFO  

我正在使用DropWizard 1.0.5。

Answer 1

DefaultLoggingFactory dropwizard 中默认用于日志记录目的。

如 you can see here利用AsyncLoggingEventAppenderFactory使用AsyncAppenderBase 构建附加程序。 ch.qos.logback.core.AsyncAppenderBase 的文档指出:

This appender and derived classes, log events asynchronously. In order to avoid loss of logging events, this appender should be closed. It is the user's responsibility to close appenders, typically at the end of the application lifecycle.

This appender buffers events in a BlockingQueue. Worker thread created by this appender takes events from the head of the queue, and dispatches them to the single appender attached to this appender.

现在回答你的问题，但是它已经在 DropWizard 中配置了吗？还是我需要启用它？

我想说，您不需要显式启用它来配置日志的异步附加。 AsyncLoggingEventAppenderFactory 将负责处理它。