/*
    * 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.giraph.worker;
  
  import org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable;
  import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
  import org.apache.giraph.mapping.MappingStore;
  import org.apache.giraph.mapping.MappingStoreOps;
  import org.apache.hadoop.io.Writable;
  import org.apache.hadoop.io.WritableComparable;
  import org.apache.log4j.Logger;
  
  /**
   * Stores LocalData for each worker
   *
   * @param <I> vertexId type
   * @param <V> vertex value type
   * @param <E> edge value type
   * @param <B> mappingTarget type
   */
  @SuppressWarnings("unchecked")
  public class LocalData<I extends WritableComparable, V extends Writable,
    E extends Writable, B extends Writable>
    extends DefaultImmutableClassesGiraphConfigurable<I, V, E> {
    /** Logger Instance */
    private static final Logger LOG = Logger.getLogger(LocalData.class);
    /** MappingStore from vertexId - target */
    private MappingStore<I, B> mappingStore;
    /** Do operations using mapping store */
    private MappingStoreOps<I, B> mappingStoreOps;
    /**
     * Constructor
     *
     * Set configuration, create &amp; initialize mapping store
     * @param conf giraph configuration
     */
    public LocalData(ImmutableClassesGiraphConfiguration<I, V, E> conf) {
      // set configuration
      setConf(conf);
      // check if user set the mapping store => create & initialize it
      mappingStore = (MappingStore<I, B>) getConf().createMappingStore();
      if (mappingStore != null) {
        mappingStore.initialize();
      }
      mappingStoreOps = (MappingStoreOps<I, B>) getConf().createMappingStoreOps();
      if (mappingStoreOps != null) {
        mappingStoreOps.initialize(mappingStore);
      }
    }
  
    public MappingStore<I, B> getMappingStore() {
      return mappingStore;
    }
  
    public MappingStoreOps<I, B> getMappingStoreOps() {
      return mappingStoreOps;
    }
  
    /**
     * Remove mapping store from localData
     * if mapping data is already embedded into vertexIds
     */
    public void removeMappingStoreIfPossible() {
      if (mappingStoreOps != null && mappingStoreOps.hasEmbedding()) {
        mappingStore = null;
      }
    }
  
    /**
     * Prints Stats of individual data it stores
     */
    public void printStats() {
      if (LOG.isInfoEnabled()) {
        LOG.info("MappingStore has : " + mappingStore.getStats() + " entries");
      }
    }
  }