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.sdk.fn.stream;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.instanceOf;
  import static org.junit.Assert.assertEquals;
  
  import java.util.concurrent.Executors;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.stub.CallStreamObserver;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.stub.StreamObserver;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.mockito.Mock;
  import org.mockito.MockitoAnnotations;
  
  /** Tests for {@link OutboundObserverFactory}. */
  @RunWith(JUnit4.class)
  public class OutboundObserverFactoryTest {
    @Mock private StreamObserver<Integer> mockRequestObserver;
    @Mock private CallStreamObserver<String> mockResponseObserver;
  
    @Before
    public void setUp() {
      MockitoAnnotations.initMocks(this);
    }
  
    @Test
    public void testDefaultInstantiation() {
      StreamObserver<String> observer =
          OutboundObserverFactory.clientDirect()
              .outboundObserverFor(this.fakeFactory(), mockRequestObserver);
      assertThat(observer, instanceOf(DirectStreamObserver.class));
    }
  
    @Test
    public void testBufferedStreamInstantiation() {
      StreamObserver<String> observer =
          OutboundObserverFactory.clientBuffered(Executors.newSingleThreadExecutor())
              .outboundObserverFor(this.fakeFactory(), mockRequestObserver);
      assertThat(observer, instanceOf(BufferingStreamObserver.class));
    }
  
    @Test
    public void testBufferedStreamWithLimitInstantiation() {
      StreamObserver<String> observer =
          OutboundObserverFactory.clientBuffered(Executors.newSingleThreadExecutor(), 1)
              .outboundObserverFor(this.fakeFactory(), mockRequestObserver);
      assertThat(observer, instanceOf(BufferingStreamObserver.class));
      assertEquals(1, ((BufferingStreamObserver<String>) observer).getBufferSize());
    }
  
    private OutboundObserverFactory.BasicFactory<Integer, String> fakeFactory() {
      return inboundObserver -> {
        assertThat(inboundObserver, instanceOf(ForwardingClientResponseObserver.class));
        return mockResponseObserver;
      };
    }
  }
  