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.arrow.flight;
  
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.ExecutionException;
  import org.apache.arrow.flight.grpc.StatusUtils;
  
  /**
   * A handler for server-sent application metadata messages during a Flight DoPut operation.
   *
   * <p>To handle messages, create an instance of this class overriding {@link #onNext(PutResult)}.
   * The other methods should not be overridden.
   */
  public class AsyncPutListener implements FlightClient.PutListener {
  
    private CompletableFuture<Void> completed;
  
    public AsyncPutListener() {
      completed = new CompletableFuture<>();
    }
  
    /**
     * Wait for the stream to finish on the server side. You must call this to be notified of any
     * errors that may have happened during the upload.
     */
    @Override
    public final void getResult() {
      try {
        completed.get();
      } catch (ExecutionException e) {
        throw StatusUtils.fromThrowable(e.getCause());
      } catch (InterruptedException e) {
        throw StatusUtils.fromThrowable(e);
      }
    }
  
    @Override
    public void onNext(PutResult val) {}
  
    @Override
    public final void onError(Throwable t) {
      completed.completeExceptionally(StatusUtils.fromThrowable(t));
    }
  
    @Override
    public final void onCompleted() {
      completed.complete(null);
    }
  
    @Override
    public boolean isCancelled() {
      return completed.isDone();
    }
  }
  