ServerProviderTest.java

/*
 * Copyright 2015, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 *    * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package io.grpc;

import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Unit tests for {@link ServerProvider}. */
@RunWith(JUnit4.class)
public class ServerProviderTest {
  private final String serviceFile = "META-INF/services/io.grpc.ServerProvider";

  @Test(expected = ManagedChannelProvider.ProviderNotFoundException.class)
  public void noProvider() {
    ServerProvider.provider();
  }

  @Test
  public void multipleProvider() {
    ClassLoader cl = new ReplacingClassLoader(
        getClass().getClassLoader(), serviceFile,
        "io/grpc/ServerProviderTest-multipleProvider.txt");
    assertSame(Available7Provider.class, ServerProvider.load(cl).getClass());
  }

  @Test
  public void unavailableProvider() {
    ClassLoader cl = new ReplacingClassLoader(
        getClass().getClassLoader(), serviceFile,
        "io/grpc/ServerProviderTest-unavailableProvider.txt");
    assertNull(ServerProvider.load(cl));
  }

  private static class BaseProvider extends ServerProvider {
    private final boolean isAvailable;
    private final int priority;

    public BaseProvider(boolean isAvailable, int priority) {
      this.isAvailable = isAvailable;
      this.priority = priority;
    }

    @Override
    protected boolean isAvailable() {
      return isAvailable;
    }

    @Override
    protected int priority() {
      return priority;
    }

    @Override
    protected ServerBuilder<?> builderForPort(int port) {
      throw new UnsupportedOperationException();
    }
  }

  public static class Available0Provider extends BaseProvider {
    public Available0Provider() {
      super(true, 0);
    }
  }

  public static class Available5Provider extends BaseProvider {
    public Available5Provider() {
      super(true, 5);
    }
  }

  public static class Available7Provider extends BaseProvider {
    public Available7Provider() {
      super(true, 7);
    }
  }

  public static class UnavailableProvider extends BaseProvider {
    public UnavailableProvider() {
      super(false, 10);
    }

    @Override
    protected int priority() {
      throw new RuntimeException("purposefully broken");
    }
  }
}