content: /*
   * 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.bookkeeper.server.component;
  
  import com.google.common.collect.Lists;
  import java.lang.reflect.Constructor;
  import java.util.List;
  import lombok.experimental.PackagePrivate;
  import org.apache.bookkeeper.common.annotation.InterfaceStability.Evolving;
  import org.apache.bookkeeper.common.component.AbstractLifecycleComponent;
  import org.apache.bookkeeper.common.component.LifecycleComponent;
  import org.apache.bookkeeper.common.util.ReflectionUtils;
  import org.apache.bookkeeper.server.conf.BookieConfiguration;
  import org.apache.bookkeeper.stats.StatsLogger;
  
  /**
   * A {@link LifecycleComponent} that runs on a bookie server. It can be loaded via reflections.
   */
  @PackagePrivate
  @Evolving
  public abstract class ServerLifecycleComponent extends AbstractLifecycleComponent<BookieConfiguration> {
  
      public static List<ServerLifecycleComponent> loadServerComponents(String[] componentClassNames,
                                                                        BookieConfiguration conf,
                                                                        StatsLogger statsLogger) {
          List<Class<? extends ServerLifecycleComponent>> componentClasses =
              Lists.newArrayListWithExpectedSize(componentClassNames.length);
          for (String componentClsName : componentClassNames) {
              componentClasses.add(ReflectionUtils.forName(componentClsName, ServerLifecycleComponent.class));
          }
          return Lists.transform(componentClasses, cls -> newComponent(cls, conf, statsLogger));
  
      }
  
      static ServerLifecycleComponent newComponent(Class<? extends ServerLifecycleComponent> theCls,
                                                   BookieConfiguration conf,
                                                   StatsLogger statsLogger) {
          try {
              Constructor<? extends ServerLifecycleComponent> constructor =
                  theCls.getConstructor(BookieConfiguration.class, StatsLogger.class);
              constructor.setAccessible(true);
              return constructor.newInstance(conf, statsLogger);
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  
      protected ServerLifecycleComponent(String componentName, BookieConfiguration conf, StatsLogger statsLogger) {
          super(componentName, conf, statsLogger);
      }
  
  }
  