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 Detail

      • 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