95 lines
2.5 KiB
Java
95 lines
2.5 KiB
Java
/*
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* Copyright (C) 2009-2019 Lightbend Inc. <https://www.lightbend.com>
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*/
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package jdocs.extension;
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// #imports
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import akka.actor.Extension;
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import akka.actor.AbstractExtensionId;
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import akka.actor.ExtensionIdProvider;
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import akka.actor.ActorSystem;
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import akka.actor.ExtendedActorSystem;
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import com.typesafe.config.Config;
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import java.util.concurrent.TimeUnit;
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import java.time.Duration;
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// #imports
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import jdocs.AbstractJavaTest;
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import akka.actor.AbstractActor;
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import org.junit.Test;
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public class SettingsExtensionDocTest extends AbstractJavaTest {
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public
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// #extension
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static class SettingsImpl implements Extension {
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public final String DB_URI;
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public final Duration CIRCUIT_BREAKER_TIMEOUT;
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public SettingsImpl(Config config) {
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DB_URI = config.getString("myapp.db.uri");
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CIRCUIT_BREAKER_TIMEOUT =
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Duration.ofMillis(
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config.getDuration("myapp.circuit-breaker.timeout", TimeUnit.MILLISECONDS));
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}
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}
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// #extension
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public
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// #extensionid
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static class Settings extends AbstractExtensionId<SettingsImpl> implements ExtensionIdProvider {
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public static final Settings SettingsProvider = new Settings();
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private Settings() {}
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public Settings lookup() {
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return Settings.SettingsProvider;
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}
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public SettingsImpl createExtension(ExtendedActorSystem system) {
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return new SettingsImpl(system.settings().config());
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}
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}
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// #extensionid
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public
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// #extension-usage-actor
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static class MyActor extends AbstractActor {
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// typically you would use static import of the Settings.SettingsProvider field
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final SettingsImpl settings = Settings.SettingsProvider.get(getContext().getSystem());
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Connection connection = connect(settings.DB_URI, settings.CIRCUIT_BREAKER_TIMEOUT);
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// #extension-usage-actor
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public Connection connect(String dbUri, Duration circuitBreakerTimeout) {
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return new Connection();
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}
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@Override
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public Receive createReceive() {
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return AbstractActor.emptyBehavior();
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}
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// #extension-usage-actor
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}
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// #extension-usage-actor
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public static class Connection {}
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@Test
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public void demonstrateHowToCreateAndUseAnAkkaExtensionInJava() {
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final ActorSystem system = null;
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try {
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// #extension-usage
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// typically you would use static import of the Settings.SettingsProvider field
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String dbUri = Settings.SettingsProvider.get(system).DB_URI;
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// #extension-usage
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} catch (Exception e) {
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// do nothing
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}
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}
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}
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