code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.skywalking.oap.server.starter;
  
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.oap.server.core.CoreModule;
  import org.apache.skywalking.oap.server.core.RunningMode;
  import org.apache.skywalking.oap.server.core.status.ServerStatusService;
  import org.apache.skywalking.oap.server.core.version.Version;
  import org.apache.skywalking.oap.server.library.module.ApplicationConfiguration;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  import org.apache.skywalking.oap.server.starter.config.ApplicationConfigLoader;
  
  /**
   * Starter core. Load the core configuration file, and initialize the startup sequence through {@link ModuleManager}.
   */
  @Slf4j
  public class OAPServerBootstrap {
      public static void start() {
          String mode = System.getProperty("mode");
          RunningMode.setMode(mode);
  
          ApplicationConfigLoader configLoader = new ApplicationConfigLoader();
          ModuleManager manager = new ModuleManager();
          try {
              ApplicationConfiguration applicationConfiguration = configLoader.load();
              manager.init(applicationConfiguration);
  
              manager.find(CoreModule.NAME)
                     .provider()
                     .getService(ServerStatusService.class)
                     .bootedNow(System.currentTimeMillis());
  
              log.info("Version of OAP: {}", Version.CURRENT);
  
              if (RunningMode.isInitMode()) {
                  log.info("OAP starts up in init mode successfully, exit now...");
                  System.exit(0);
              }
          } catch (Throwable t) {
              log.error(t.getMessage(), t);
              System.exit(1);
          }
      }
  }
  