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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.repository.patches;
  
  import org.apache.atlas.AtlasException;
  import org.apache.atlas.ha.HAConfiguration;
  import org.apache.atlas.listener.ActiveStateChangeHandler;
  import org.apache.atlas.service.Service;
  import org.apache.commons.configuration.Configuration;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.core.annotation.Order;
  import org.springframework.stereotype.Component;
  
  import javax.inject.Inject;
  
  @Component
  @Order(3)
  public class AtlasPatchService implements Service, ActiveStateChangeHandler {
      private static final Logger LOG = LoggerFactory.getLogger(AtlasPatchService.class);
  
      private final Configuration     configuration;
      private final AtlasPatchManager patchManager;
  
      @Inject
      public AtlasPatchService(Configuration configuration, AtlasPatchManager patchManager) {
          this.configuration = configuration;
          this.patchManager  = patchManager;
      }
  
      @Override
      public void start() throws AtlasException {
          LOG.info("==> AtlasPatchService.start()");
  
          if (!HAConfiguration.isHAEnabled(configuration)) {
              startInternal();
          } else {
              LOG.info("AtlasPatchService.start(): deferring patches until instance activation");
          }
  
          LOG.info("<== AtlasPatchService.start()");
      }
  
      @Override
      public void stop() {
          LOG.info("AtlasPatchService.stop(): stopped");
      }
  
      @Override
      public void instanceIsActive() {
          LOG.info("==> AtlasPatchService.instanceIsActive()");
  
          startInternal();
  
          LOG.info("<== AtlasPatchService.instanceIsActive()");
      }
  
      @Override
      public void instanceIsPassive() {
          LOG.info("AtlasPatchService.instanceIsPassive(): no action needed");
      }
  
      @Override
      public int getHandlerOrder() {
          return HandlerOrder.ATLAS_PATCH_SERVICE.getOrder();
      }
  
      void startInternal() {
          try {
              LOG.info("AtlasPatchService: applying patches...");
  
              patchManager.applyAll();
          } catch (Exception ex) {
              LOG.error("AtlasPatchService: failed in applying patches", ex);
          }
      }
  }
  