content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package io.activej.launchers.rpc;
  
  import io.activej.config.Config;
  import io.activej.config.ConfigModule;
  import io.activej.eventloop.Eventloop;
  import io.activej.eventloop.inspector.ThrottlingController;
  import io.activej.inject.annotation.Inject;
  import io.activej.inject.annotation.Provides;
  import io.activej.inject.binding.OptionalDependency;
  import io.activej.inject.module.AbstractModule;
  import io.activej.inject.module.Module;
  import io.activej.jmx.JmxModule;
  import io.activej.launcher.Launcher;
  import io.activej.promise.Promise;
  import io.activej.reactor.nio.NioReactor;
  import io.activej.rpc.server.RpcServer;
  import io.activej.service.ServiceGraphModule;
  
  import java.net.InetSocketAddress;
  
  import static io.activej.config.Config.ofClassPathProperties;
  import static io.activej.config.Config.ofSystemProperties;
  import static io.activej.config.converter.ConfigConverters.ofInetSocketAddress;
  import static io.activej.inject.module.Modules.combine;
  import static io.activej.launchers.initializers.Initializers.ofEventloop;
  
  public abstract class RpcServerLauncher extends Launcher {
  	public static final String PROPERTIES_FILE = "rpc-server.properties";
  
  	@Inject
  	RpcServer rpcServer;
  
  	@Provides
  	public NioReactor reactor(Config config, OptionalDependency<ThrottlingController> throttlingController) {
  		return Eventloop.builder()
  			.initialize(ofEventloop(config.getChild("eventloop")))
  			.withInspector(throttlingController.orElse(null))
  			.build();
  	}
  
  	@Provides
  	Config config() {
  		return Config.create()
  			.with("listenAddresses", Config.ofValue(ofInetSocketAddress(), new InetSocketAddress(9000)))
  			.overrideWith(ofClassPathProperties(PROPERTIES_FILE, true))
  			.overrideWith(ofSystemProperties("config"));
  	}
  
  	@Override
  	protected final Module getModule() {
  		return combine(
  			ServiceGraphModule.create(),
  			JmxModule.create(),
  			ConfigModule.builder()
  				.withEffectiveConfigLogger()
  				.build(),
  			getBusinessLogicModule());
  	}
  
  	// By design, user should provide rpcServer here.
  	protected Module getBusinessLogicModule() {
  		return Module.empty();
  	}
  
  	@Override
  	protected void run() throws Exception {
  		awaitShutdown();
  	}
  
  	public static void main(String[] args) throws Exception {
  		new RpcServerLauncher() {
  			@Override
  			protected Module getBusinessLogicModule() {
  				return new AbstractModule() {
  					@Provides
  					RpcServer server(NioReactor reactor, Config config) {
  						return RpcServer.builder(reactor)
  							.withListenAddress(config.get(ofInetSocketAddress(), "listenAddresses"))
  							.withMessageTypes(String.class)
  							.withHandler(String.class,
  								req -> Promise.of("Request: " + req))
  							.build();
  					}
  				};
  			}
  		}.launch(args);
  	}
  }
  