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.bookkeeper.stream.storage.impl.grpc;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  
  import io.grpc.Status;
  import io.grpc.StatusException;
  import io.grpc.StatusRuntimeException;
  import io.grpc.stub.StreamObserver;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.atomic.AtomicReference;
  
  /**
   * Response Observer used for testing.
   */
  public class TestResponseObserver<RespT> implements StreamObserver<RespT> {
  
      private final AtomicReference<RespT> resultHolder =
          new AtomicReference<>();
      private final AtomicReference<Throwable> exceptionHolder =
          new AtomicReference<>();
      private final CountDownLatch latch = new CountDownLatch(1);
  
      @Override
      public void onNext(RespT resp) {
          resultHolder.set(resp);
      }
  
      @Override
      public void onError(Throwable t) {
          exceptionHolder.set(t);
          latch.countDown();
      }
  
      @Override
      public void onCompleted() {
          latch.countDown();
      }
  
      public RespT get() throws Throwable {
          latch.await();
          if (null != exceptionHolder.get()) {
              throw exceptionHolder.get();
          }
          return resultHolder.get();
      }
  
      public void verifySuccess(RespT resp) throws Exception {
          latch.await();
          assertNull(exceptionHolder.get());
          assertNotNull(resultHolder.get());
          assertEquals(resp, resultHolder.get());
      }
  
      public void verifyException(Status status) throws Exception {
          latch.await();
          assertNull(resultHolder.get());
          assertNotNull(exceptionHolder.get());
          assertTrue(
              exceptionHolder.get() instanceof StatusRuntimeException
                  || exceptionHolder.get() instanceof StatusException);
          if (exceptionHolder.get() instanceof StatusRuntimeException) {
              assertEquals(status, ((StatusRuntimeException) exceptionHolder.get()).getStatus());
          } else if (exceptionHolder.get() instanceof StatusException) {
              assertEquals(status, ((StatusException) exceptionHolder.get()).getStatus());
          }
      }
  }
  