Module org.apache.jena.core
Package org.apache.jena.sys

Class JenaSystem

java.lang.Object
org.apache.jena.sys.JenaSystem
public class JenaSystem extends Object
Jena "system" - simple controls for ensuring components are loaded and initialized.

All initialization should be concurrent and thread-safe. In particular, some subsystems need initialization in some sort of order (e.g. ARQ before TDB).

This is achieved by "levels": levels less than 500 are considered "Jena system levels" and are reserved.

  • 0 - reserved
  • 10 - jena-core
  • 20 - RIOT
  • 30 - ARQ
  • 40 - TDB
  • 50-100 - Other Jena system modules.
  • 101 - Fuseki
  • 102-9998 - Application
  • 9999 - other
See also the notes on Jena initialization.

  • Field Details

    • DEBUG_INIT

      public static boolean DEBUG_INIT
      Development support - flag to enable output during initialization. Output to System.err, not a logger to avoid the risk of recursive initialization.

  • Constructor Details

    • JenaSystem

      public JenaSystem()

  • Method Details

    • logLifecycle

      public static void logLifecycle(String fmt, Object... args)
      Output a debugging message if DEBUG_INIT is set

    • init

      public static void init()

    • shutdown

      public static void shutdown()