Package org.apache.ignite.internal.util

Class GridBusyLock

java.lang.Object
org.apache.ignite.internal.util.GridBusyLock
@GridToStringExclude public class GridBusyLock extends Object
Synchronization aid to track "busy" state of a subsystem that owns it.

For example, there may be a manager that have different threads for some purposes and the manager must not be stopped while at least a single thread is in "busy" state. In this situation each thread must enter to "busy" state calling method enterBusy() in critical pieces of code which, i.e. use grid kernal functionality, notifying that the manager and the whole grid kernal cannot be stopped while it's in progress. Once the activity is done, the thread should leave "busy" state calling method leaveBusy(). The manager itself, when stopping, should call method block() that blocks till all activities leave "busy" state.

  • Constructor Details

    • GridBusyLock

      public GridBusyLock()

  • Method Details

    • enterBusy

      public boolean enterBusy()
      Enters "busy" state.
      Returns:
      true if entered to busy state.

    • blockedByCurrentThread

      public boolean blockedByCurrentThread()
      Checks if busy lock was blocked by current thread.
      Returns:
      True if busy lock was blocked by current thread.

    • leaveBusy

      public void leaveBusy()
      Leaves "busy" state.

    • block

      public void block()
      Blocks current thread till all activities left "busy" state and prevents them from further entering to "busy" state.

    • unblock

      public void unblock()
      Makes possible for activities entering busy state again.