pekko/akka-actor-tests/src/test/java/akka/actor/JavaExtension.java

/**
 *  Copyright (C) 2009-2012 Typesafe Inc. <http://www.typesafe.com>
 */
package akka.actor;

import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

import akka.testkit.AkkaSpec;

import com.typesafe.config.ConfigFactory;
import com.typesafe.config.Config;

import static org.junit.Assert.*;

public class JavaExtension {

  static class TestExtensionId extends AbstractExtensionId<TestExtension> implements ExtensionIdProvider {
    public final static TestExtensionId TestExtensionProvider = new TestExtensionId();

    public ExtensionId<TestExtension> lookup() {
      return TestExtensionId.TestExtensionProvider;
    }

    public TestExtension createExtension(ActorSystemImpl i) {
      return new TestExtension(i);
    }
  }

  static class TestExtension implements Extension {
    public final ActorSystemImpl system;

    public TestExtension(ActorSystemImpl i) {
      system = i;
    }
  }

  static class OtherExtension implements Extension {
    static final ExtensionKey<OtherExtension> key = new ExtensionKey<OtherExtension>(OtherExtension.class) {
    };

    public final ActorSystemImpl system;

    public OtherExtension(ActorSystemImpl i) {
      system = i;
    }
  }

  private static ActorSystem system;

  @BeforeClass
  public static void beforeAll() {
    Config c = ConfigFactory.parseString("akka.extensions = [ \"akka.actor.JavaExtension$TestExtensionId\" ]")
        .withFallback(AkkaSpec.testConf());
    system = ActorSystem.create("JavaExtension", c);
  }

  @AfterClass
  public static void afterAll() {
    system.shutdown();
    system = null;
  }

  @Test
  public void mustBeAccessible() {
    assertSame(system.extension(TestExtensionId.TestExtensionProvider).system, system);
    assertSame(TestExtensionId.TestExtensionProvider.apply(system).system, system);
  }

  @Test
  public void mustBeAdHoc() {
    assertSame(OtherExtension.key.apply(system).system, system);
  }

}