Package org.apache.beam.runners.fnexecution.state

Interface StateRequestHandler

  • public interface StateRequestHandler
    Handler for StateRequests.

    • Method Summary

      All Methods Static Methods Instance Methods Abstract Methods Default Methods 
      Modifier and Type Method Description
      default java.lang.Iterable<org.apache.beam.model.fnexecution.v1.BeamFnApi.ProcessBundleRequest.CacheToken> getCacheTokens()
      Retrieves a list of valid cache tokens.
      java.util.concurrent.CompletionStage<org.apache.beam.model.fnexecution.v1.BeamFnApi.StateResponse.Builder> handle​(org.apache.beam.model.fnexecution.v1.BeamFnApi.StateRequest request)
      Handle a BeamFnApi.StateRequest asynchronously.
      static StateRequestHandler unsupported()  

    • Method Detail

      • handle

        java.util.concurrent.CompletionStage<org.apache.beam.model.fnexecution.v1.BeamFnApi.StateResponse.Builder> handle​(org.apache.beam.model.fnexecution.v1.BeamFnApi.StateRequest request)
                                                                                                           throws java.lang.Exception
        Handle a BeamFnApi.StateRequest asynchronously.

        The handler is allowed to complete the future within the callers thread if it can be completed without blocking. Otherwise the caller should delegate to another thread to perform any blocking work completing the future when able.

        Throwing an error during handling will complete the handler result CompletionStage exceptionally.

        Throws:
        java.lang.Exception

      • getCacheTokens

        default java.lang.Iterable<org.apache.beam.model.fnexecution.v1.BeamFnApi.ProcessBundleRequest.CacheToken> getCacheTokens()
        Retrieves a list of valid cache tokens.