/*
    * 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.maven.index.examples.indexing;
  
  import javax.annotation.PreDestroy;
  import javax.inject.Singleton;
  
  import java.io.IOException;
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.stereotype.Component;
  
  /**
   * This class represents a mapping between repositoryId-s and their respective indexes.
   *
   * @author mtodorov
   */
  @Singleton
  @Component
  public class RepositoryIndexManager {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(RepositoryIndexManager.class);
  
      /**
       * K: repositoryId
       * V: index
       */
      private Map<String, RepositoryIndexer> indexes = new LinkedHashMap<>();
  
      public RepositoryIndexManager() {
          // no op
      }
  
      /**
       * A convenience method for closing the indexes. This method will be called
       * by the Spring container and it shouldn't be invoked directly.
       * <p/>
       * This method is of particular importance, as you should close the indexes properly.
       */
      @PreDestroy
      private void close() {
          for (String repositoryId : indexes.keySet()) {
              try {
                  final RepositoryIndexer repositoryIndexer = indexes.get(repositoryId);
  
                  LOGGER.debug("Closing indexer for " + repositoryIndexer.getRepositoryId() + "...");
  
                  repositoryIndexer.close();
  
                  LOGGER.debug("Closed indexer for " + repositoryIndexer.getRepositoryId() + ".");
              } catch (IOException e) {
                  LOGGER.error(e.getMessage(), e);
              }
          }
      }
  
      public Map<String, RepositoryIndexer> getIndexes() {
          return indexes;
      }
  
      public void setIndexes(Map<String, RepositoryIndexer> indexes) {
          this.indexes = indexes;
      }
  
      public RepositoryIndexer getRepositoryIndex(String repositoryId) {
          return indexes.get(repositoryId);
      }
  
      public RepositoryIndexer addRepositoryIndex(String repositoryId, RepositoryIndexer value) {
          return indexes.put(repositoryId, value);
      }
  
      public RepositoryIndexer removeRepositoryIndex(String repositoryId) {
          return indexes.remove(repositoryId);
      }
  }