Java應用日志框架：TNT4J
TNT4J是一個改進Log4J新的開源Java應用日志框架。用于應用程序活動的跟蹤、相關性檢查、診斷，可以跨多個應用程序，運行時，服務器，地理的位置。這個API是專門用以解決分布式，并發，多線程，多用戶應用，包括活動的相關性，應用程序的狀態轉儲，性能和用戶定義的量度。
以下是它的特性：
- Simple programming model to facilitate fast root-cause, log analysis
- Automated timing of application activities and sub-activities (elapsed, idle time, message age)
- Application state dump framework for reporting internal variables, data structures
- Granular conditional logging based on application tokens, patterns, that can be shared accross applications, runtimes
- Share logging context across application, thread, runtime boundaries
- Inter-log correlation of log entries (correlators and tags) between multiple related applications
- Intra-log correlation of related activities and sub-activities between multiple applications and threads
- Event location tags such as GPS, server etc.
- Message flow direction for composite applications that exchange messages (e.g. SOAP, JMS, and SQL etc.)
- User defined properties such as CPU, memory logging, thread statistics per process/thread
- Extensible activity, sink, error listeners for pre, post event processing
- Granular context such as thread id, process id, server, application name </ul>
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