Some more test cleanup to not create so many threads. See #3320

akka-docs/rst/java/code/docs/extension/SettingsExtensionDocTest.java

@@ -0,0 +1,95 @@
+/**
+ * Copyright (C) 2009-2013 Typesafe Inc. <http://www.typesafe.com>
+ */
+package docs.extension;
+
+//#imports
+import akka.actor.Extension;
+import akka.actor.AbstractExtensionId;
+import akka.actor.ExtensionIdProvider;
+import akka.actor.ActorSystem;
+import akka.actor.ExtendedActorSystem;
+import scala.concurrent.duration.Duration;
+import com.typesafe.config.Config;
+import java.util.concurrent.TimeUnit;
+
+//#imports
+
+import akka.actor.UntypedActor;
+import org.junit.Test;
+
+public class SettingsExtensionDocTest {
+
+  static
+  //#extension
+  public class SettingsImpl implements Extension {
+
+    public final String DB_URI;
+    public final Duration CIRCUIT_BREAKER_TIMEOUT;
+
+    public SettingsImpl(Config config) {
+      DB_URI = config.getString("myapp.db.uri");
+      CIRCUIT_BREAKER_TIMEOUT =
+        Duration.create(config.getMilliseconds("myapp.circuit-breaker.timeout"),
+          TimeUnit.MILLISECONDS);
+    }
+
+  }
+
+  //#extension
+
+  static
+  //#extensionid
+  public class Settings extends AbstractExtensionId<SettingsImpl>
+    implements ExtensionIdProvider {
+    public final static Settings SettingsProvider = new Settings();
+
+    public Settings lookup() {
+      return Settings.SettingsProvider;
+    }
+
+    public SettingsImpl createExtension(ExtendedActorSystem system) {
+      return new SettingsImpl(system.settings().config());
+    }
+  }
+
+  //#extensionid
+
+  static
+  //#extension-usage-actor
+  public class MyActor extends UntypedActor {
+    // typically you would use static import of the Settings.SettingsProvider field
+    final SettingsImpl settings =
+      Settings.SettingsProvider.get(getContext().system());
+    Connection connection =
+      connect(settings.DB_URI, settings.CIRCUIT_BREAKER_TIMEOUT);
+
+  //#extension-usage-actor
+
+    public Connection connect(String dbUri, Duration circuitBreakerTimeout) {
+      return new Connection();
+    }
+
+    public void onReceive(Object msg) {
+    }
+  //#extension-usage-actor
+  }
+  //#extension-usage-actor
+
+  public static class Connection {
+  }
+
+  @Test
+  public void demonstrateHowToCreateAndUseAnAkkaExtensionInJava() {
+    final ActorSystem system = null;
+    try {
+      //#extension-usage
+      // typically you would use static import of the Settings.SettingsProvider field
+      String dbUri = Settings.SettingsProvider.get(system).DB_URI;
+      //#extension-usage
+    } catch (Exception e) {
+      //do nothing
+    }
+  }
+
+}