content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.beam.runners.dataflow.worker.windmill.client.grpc.observers;
  
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.Internal;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.stub.StreamObserver;
  
  @Internal
  public interface TerminatingStreamObserver<T> extends StreamObserver<T> {
  
    /**
     * Terminates the StreamObserver.
     *
     * @implSpec Different then {@link #onError(Throwable)} and {@link #onCompleted()} which can only
     *     be called once during the lifetime of each {@link StreamObserver}, terminate()
     *     implementations are meant to be idempotent and can be called multiple times as well as
     *     being interleaved with other stream operations.
     */
    void terminate(Throwable terminationException);
  }
  