content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.master.file.contexts;
  
  import io.grpc.stub.ServerCallStreamObserver;
  import io.grpc.stub.StreamObserver;
  
  /**
   * {@link CallTracker} implementation for gRPC calls.
   */
  public class GrpcCallTracker implements CallTracker {
  
    /** Server-side gRPC stream observer. */
    private ServerCallStreamObserver<?> mStreamObserver;
  
    /**
     * Creates a call tracker for gRPC.
     *
     * @param streamObserver server stream observer
     */
    public GrpcCallTracker(StreamObserver<?> streamObserver) {
      if (!(streamObserver instanceof ServerCallStreamObserver)) {
        throw new IllegalStateException(String.format(
            "Call tracking is only supported for server streams. Passed stream type: %s",
            streamObserver.getClass().getSimpleName()));
      }
      mStreamObserver = (ServerCallStreamObserver) streamObserver;
    }
  
    @Override
    public boolean isCancelled() {
      return mStreamObserver.isCancelled();
    }
  
    @Override
    public Type getType() {
      return Type.GRPC_CLIENT_TRACKER;
    }
  }
  