Package org.opendaylight.openflowplugin.applications.frsync

Interface SemaphoreKeeper<K>

Type Parameters:
K - key type
All Known Implementing Classes:
SemaphoreKeeperGuavaImpl
public interface SemaphoreKeeper<K>
Key based semaphore provider. For the same key there is always only one semaphore available. Unused semaphores are garbage-collect.

  • Method Details

    • summonGuard

      Semaphore summonGuard(@NonNull K key)
      Create or load semaphore for key from cache.
      Parameters:
      key - semaphore identifier
      Returns:
      new or existing semaphore for given key, for one key there is always only one semaphore available

    • summonGuardAndAcquire

      Semaphore summonGuardAndAcquire(@NonNull K key)
      Get guard and lock for key.
      Parameters:
      key - for which guard should be created and acquired
      Returns:
      semaphore guard

    • releaseGuard

      void releaseGuard(@Nullable Semaphore guard)
      Unlock and release guard.
      Parameters:
      guard - semaphore guard which should be released