The rolling file appender enables logging to a file with several backup files. You can configure the maximum amount of disk space that the trace files may use. The rolling file appender works in a single tasking environment (as in the resource adapter) as well as in a multitasking environment (as in the proxy container).
Logging files
The rolling file appender creates the files <File>.gen and (in a multitasking configuration) <File>.lck for internal use only and requires these in operation. <File> is the name of the current logging file, e.g. BeanConnect.logging.txt. The file in the given example is specified in the configuration file for the BeanConnectShortLoggingFile appender.
The rolling file appender always writes to the logging file <File>. At switch-over:
The file
<File>is copied to a backup file.The file
<File>is written again.
At switch-over, the oldest existing backup files are deleted when:
After the file is copied, there are more backup files than the value specified for
<MaxNbrBackupFiles>and<MaxNbrBackupFiles>is greater than 0.
Specifications in angle brackets (<>) such as<File> or <MaxNbrBackupFiles> are appender properties. For further information, see Predefined logging configuration of a resource adapter and Predefined logging configuration of a proxy .
Example 24 Logging files
In this example, <File>=<Filename>.txt and <MaxNbrBackupFiles>=3.
Situation before switch-over:
<Filename>.txt | In use |
<Filename>.13.txt | Oldest backup file |
<Filename>.14.txt | |
<Filename>.15.txt | Newest backup file |
At switch-over, <Filename>.txt is copied to <Filename>.16.txt, <Filename>.13.txt is deleted, and <Filename>.txt is then written again.
Situation after switch-over:
<Filename>.txt | In use |
<Filename>.14.txt | Oldest backup file |
<Filename>.15.txt | |
<Filename>.16.txt | Newest backup file |