Package org.apache.felix.framework

Class Logger

java.lang.Object
org.apache.felix.framework.Logger
All Implemented Interfaces:
EventListener, ServiceListener
public class Logger extends Object implements ServiceListener

This class mimics the standard OSGi LogService interface. An instance of this class is used by the framework for all logging. By default this class logs messages to standard out. The log level can be set to control the amount of logging performed, where a higher number results in more logging. A log level of zero turns off logging completely.

The log levels match those specified in the OSGi Log Service (i.e., 1 = error, 2 = warning, 3 = information, and 4 = debug). The default value is 1.

This class also uses the System Bundle's context to track log services and will use the highest ranking log service, if present, as a back end instead of printing to standard out. The class uses reflection to invoking the log service's method to avoid a dependency on the log interface.

  • Field Details

  • Constructor Details

    • Logger

      public Logger()

  • Method Details

    • setLogLevel

      public final void setLogLevel(int i)

    • getLogLevel

      public final int getLogLevel()

    • setSystemBundleContext

      protected void setSystemBundleContext(BundleContext context)

    • log

      public final void log(int level, String msg)

    • log

      public final void log(int level, String msg, Throwable throwable)

    • log

      public final void log(ServiceReference sr, int level, String msg)

    • log

      public final void log(ServiceReference sr, int level, String msg, Throwable throwable)

    • log

      public final void log(Bundle bundle, int level, String msg)

    • log

      public final void log(Bundle bundle, int level, String msg, Throwable throwable)

    • doLog

      protected void doLog(Bundle bundle, ServiceReference sr, int level, String msg, Throwable throwable)

    • serviceChanged

      public final void serviceChanged(ServiceEvent event)
      This method implements the callback for the ServiceListener interface. It is public as a byproduct of implementing the interface and should not be called directly. This method tracks run-time changes to log service availability. If the log service being used by the framework's logging mechanism goes away, then this will try to find an alternative. If a higher ranking log service is registered, then this will switch to the higher ranking log service.
      Specified by:
      serviceChanged in interface ServiceListener
      Parameters:
      event - The ServiceEvent object.