Class RowLocking3Escalate

All Implemented Interfaces:
LockingPolicy

public class RowLocking3Escalate extends ContainerLocking3
A locking policy that implements row level locking with isolation degree 3.
See Also:
  • Constructor Details

    • RowLocking3Escalate

      protected RowLocking3Escalate(LockFactory lf)
  • Method Details

    • lockContainer

      public boolean lockContainer(Transaction t, ContainerHandle container, boolean waitForLock, boolean forUpdate) throws StandardException
      Escalates Row Locking 3 to Container Locking 3.

      This call is made by code which tracks the number of locks on a container. When the number of locks exceeds the escalate threshold the caller creates this new locking policy, calls lockContainer(), and substitues it for the old locking policy. The lockContainer call determines which table lock to get (S or X), gets that table lock, and then releases the row locks on the table. It is assumed that this is called on a open container for lock only.

      Specified by:
      lockContainer in interface LockingPolicy
      Overrides:
      lockContainer in class ContainerLocking3
      Parameters:
      t - Transaction to associate lock with.
      container - Container to lock.
      waitForLock - Ignored - will never wait for a lock.
      forUpdate - Ignored, mode determined from current lock state.
      Returns:
      true if the lock was obtained, false if it wasn't. False should only be returned if the waitForLock policy was set to "false," and the lock was unavailable.
      Throws:
      StandardException - Standard exception policy.
      See Also: