Module org.eclipse.persistence.core
Package org.eclipse.persistence.internal.helper

Class DeferredLockManager

java.lang.Object
org.eclipse.persistence.internal.helper.DeferredLockManager
public class DeferredLockManager extends Object
INTERNAL:

Purpose: Be used for deadlock avoidance through allowing detection and resolution.

Responsibilities:

  • Keep track of all deferred locks of each thread.
  • Keep track of all active locks of each thread..
  • Maintain the depth of the each thread.

  • Field Details

    • deferredLocks

      protected Vector<ConcurrencyManager> deferredLocks

    • activeLocks

      protected Vector<ConcurrencyManager> activeLocks

    • threadDepth

      protected int threadDepth

    • isThreadComplete

      protected boolean isThreadComplete

    • SHOULD_USE_DEFERRED_LOCKS

      public static boolean SHOULD_USE_DEFERRED_LOCKS

  • Constructor Details

    • DeferredLockManager

      public DeferredLockManager()
      DeferredLockManager constructor comment.

  • Method Details

    • addActiveLock

      public void addActiveLock(Object manager)
      add a concurrency manager as active locks to the DLM

    • addDeferredLock

      public void addDeferredLock(Object manager)
      add a concurrency manager as deferred locks to the DLM

    • decrementDepth

      public void decrementDepth()
      decrement the depth of the thread

    • getActiveLocks

      public Vector<ConcurrencyManager> getActiveLocks()
      Return a set of the active locks from the DLM

    • getDeferredLocks

      public Vector<ConcurrencyManager> getDeferredLocks()
      Return a set of the deferred locks

    • getThreadDepth

      public int getThreadDepth()
      Return the depth of the thread associated with the DLM, being used to release the lock

    • hasDeferredLock

      public boolean hasDeferredLock()
      Return if there are any deferred locks.

    • incrementDepth

      public void incrementDepth()
      increment the depth of the thread

    • isThreadComplete

      public boolean isThreadComplete()
      Return if the thread is complete

    • releaseActiveLocksOnThread

      public void releaseActiveLocksOnThread()
      Release the active lock on the DLM

    • setActiveLocks

      public void setActiveLocks(Vector<ConcurrencyManager> activeLocks)
      set a set of the active locks to the DLM

    • setDeferredLocks

      public void setDeferredLocks(Vector<ConcurrencyManager> deferredLocks)
      set a set of the deferred locks to the DLM

    • setIsThreadComplete

      public void setIsThreadComplete(boolean isThreadComplete)
      set if the thread is complete in the given DLM