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;
  
  import com.google.auto.value.AutoValue;
  import org.apache.beam.sdk.annotations.Internal;
  
  /**
   * Wrapper for a {@link WindmillStream} that allows callers to tie an action after the stream is
   * finished being used. Has an option for closing code to be a no-op.
   */
  @Internal
  @AutoValue
  public abstract class CloseableStream<StreamT extends WindmillStream> implements AutoCloseable {
    public static <StreamT extends WindmillStream> CloseableStream<StreamT> create(
        StreamT stream, Runnable onClose) {
      return new AutoValue_CloseableStream<>(stream, onClose);
    }
  
    public abstract StreamT stream();
  
    abstract Runnable onClose();
  
    @Override
    public void close() throws Exception {
      onClose().run();
    }
  }
  