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   * 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,
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   * See the License for the specific language governing permissions and
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  package org.apache.beam.sdk.fn.channel;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assume.assumeTrue;
  
  import org.apache.beam.model.pipeline.v1.Endpoints;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.ManagedChannel;
  import org.apache.commons.lang3.SystemUtils;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TemporaryFolder;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link ManagedChannelFactory}. */
  @RunWith(JUnit4.class)
  public class ManagedChannelFactoryTest {
    @Rule public TemporaryFolder tmpFolder = new TemporaryFolder();
  
    @Test
    public void testDefaultChannel() {
      Endpoints.ApiServiceDescriptor apiServiceDescriptor =
          Endpoints.ApiServiceDescriptor.newBuilder().setUrl("localhost:123").build();
      ManagedChannel channel =
          ManagedChannelFactory.createDefault().forDescriptor(apiServiceDescriptor);
      assertEquals("localhost:123", channel.authority());
      channel.shutdownNow();
    }
  
    @Test
    public void testEpollHostPortChannel() {
      assumeTrue(SystemUtils.IS_OS_LINUX);
      assertTrue(org.apache.beam.vendor.grpc.v1p69p0.io.netty.channel.epoll.Epoll.isAvailable());
      Endpoints.ApiServiceDescriptor apiServiceDescriptor =
          Endpoints.ApiServiceDescriptor.newBuilder().setUrl("localhost:123").build();
      ManagedChannel channel =
          ManagedChannelFactory.createEpoll().forDescriptor(apiServiceDescriptor);
      assertEquals("localhost:123", channel.authority());
      channel.shutdownNow();
    }
  
    @Test
    public void testEpollDomainSocketChannel() throws Exception {
      assumeTrue(SystemUtils.IS_OS_LINUX);
      assertTrue(org.apache.beam.vendor.grpc.v1p69p0.io.netty.channel.epoll.Epoll.isAvailable());
      Endpoints.ApiServiceDescriptor apiServiceDescriptor =
          Endpoints.ApiServiceDescriptor.newBuilder()
              .setUrl("unix://" + tmpFolder.newFile().getAbsolutePath())
              .build();
      ManagedChannel channel =
          ManagedChannelFactory.createEpoll().forDescriptor(apiServiceDescriptor);
      assertEquals(apiServiceDescriptor.getUrl().substring("unix://".length()), channel.authority());
      channel.shutdownNow();
    }
  }
  