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.stream.server.service;
  
  import java.io.IOException;
  import java.util.function.Supplier;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.bookkeeper.common.component.AbstractLifecycleComponent;
  import org.apache.bookkeeper.stats.StatsLogger;
  import org.apache.bookkeeper.stream.storage.api.cluster.ClusterController;
  import org.apache.bookkeeper.stream.storage.conf.StorageConfiguration;
  
  /**
   * A service that runs cluster controller.
   */
  @Slf4j
  public class ClusterControllerService
      extends AbstractLifecycleComponent<StorageConfiguration> {
  
      private final Supplier<ClusterController> controllerSupplier;
      private ClusterController controller;
  
      public ClusterControllerService(StorageConfiguration conf,
                                      Supplier<ClusterController> controllerSupplier,
                                      StatsLogger statsLogger) {
          super("cluster-controller", conf, statsLogger);
          this.controllerSupplier = controllerSupplier;
      }
  
      @Override
      protected void doStart() {
          if (null == controller) {
              controller = controllerSupplier.get();
              controller.start();
              log.info("Successfully started the cluster controller.");
          }
      }
  
      @Override
      protected void doStop() {
          if (null != controller) {
              controller.stop();
          }
      }
  
      @Override
      protected void doClose() throws IOException {
          // no-op
      }
  }
  