core/src/test/java/io/grpc/ServerProviderTest.java

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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");
    }
  }
}