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jachLog is a pure pascal, flexible, extensible and lightweight library to add advanced logging capabilities to your Delphi applications.

The library supports multithreaded applications and can be itself multithreaded, which helps minimize the impact it have on the performance of mission critical software.

As for now, only Windows is supported, Android and Linux support is comming soon. It can be used in Desktop, console and server applications.

The main logging class provide methods to add log records in a simple, yet powerful manner.

How to use the library

To learn how to use the library, read:

• Basic logging:
  • Get started page.
  • Simplifying everything, use the ujachLogAuto unit
  • Log levels and filter by level - Learn about the standard meaning of the Severity levels
• Advanced:
  • Limiting the log output:
    • Topics and filter by level by topic
    • Debug verbosity
  • Multiple log destinations
  • Manually creating and configuring the logging object and destinationsTaking control of all aspects of the log, getting rid of the ujachLogAuto unit
  • Multiple, independent logs in the same application
  • Performance
    • Caching log messages
    • Writing to destinations using multiple threads

Documentation:

Units and classes

• ujachLogMgr
  • TjachLog
  • TjachLogWriteCoordinatorThread
  • TjachLogWriterThread
• ujachLogClasses
  • TjachLogTopicIndex
  • TLogSeverity
  • TLogLevel
  • IjachLogEntry
  • TjachLogEntryList
  • TjachLogWriter
  • TLogCache
• ujachLogToDisk
  • TjachLogToDisk
• ujachLogToConsole
  • TjachLogToConsole
• ujachLogAuto
  • jachLog global variable
  • function GetLogDiskWriter
  • function GetLogConsoleWriter

Demos:

Further reading

Recommended topics:

• Severity levels