Package org.opendaylight.controller.cluster.access.client

Class BackendInfoResolver<T extends BackendInfo>

java.lang.Object
org.opendaylight.controller.cluster.access.client.BackendInfoResolver<T>
All Implemented Interfaces:
AutoCloseable
public abstract class BackendInfoResolver<T extends BackendInfo> extends Object implements AutoCloseable
Caching resolver which resolves a cookie to a leader ActorRef. This class needs to be specialized by the client. It is used by ClientActorBehavior for request dispatch. Results are cached until they are invalidated by either the client actor (when a message timeout is detected) and by the specific frontend (on explicit invalidation or when updated information becomes available).

If the completion stage returned by this interface's methods fails with a RequestException, it will be forwarded to all outstanding requests towards the leader. If it fails with a TimeoutException, resolution process will be retried. If it fails with any other cause, it will we wrapped as a RuntimeRequestException wrapping that cause.

Author:
Robert Varga

  • Constructor Details

    • BackendInfoResolver

      public BackendInfoResolver()

  • Method Details

    • getBackendInfo

      public abstract @NonNull CompletionStage<? extends T> getBackendInfo(@NonNull Long cookie)
      Request resolution of a particular backend identified by a cookie. This request can be satisfied from the cache.
      Parameters:
      cookie - Backend cookie
      Returns:
      A CompletionStage resulting in information about the backend

    • refreshBackendInfo

      public abstract @NonNull CompletionStage<? extends T> refreshBackendInfo(@NonNull Long cookie, @NonNull T staleInfo)
      Request re-resolution of a particular backend identified by a cookie, indicating a particular information as being stale. If the implementation's cache holds the stale information, it should be purged.
      Parameters:
      cookie - Backend cookie
      staleInfo - Stale backend information
      Returns:
      A CompletionStage resulting in information about the backend

    • notifyWhenBackendInfoIsStale

      public abstract @NonNull Registration notifyWhenBackendInfoIsStale(Consumer<Long> callback)
      Registers a callback to be notified when BackendInfo that may have been previously obtained is now stale and should be refreshed.
      Parameters:
      callback - the callback that takes the backend cookie whose BackendInfo is now stale.
      Returns:
      a Registration

    • resolveCookieName

      public abstract @NonNull String resolveCookieName(Long cookie)

    • close

      public void close()
      Specified by:
      close in interface AutoCloseable