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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 David Berkman
 * 
 * This file is part of the SmallMind Code Project.
 * 
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 * 
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 * 
 * ...or...
 * 
 * 2) The terms of the Apache License, Version 2.0.
 * 
 * The SmallMind Code Project is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License or Apache License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 * 
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.persistence.cache;

import java.io.Serializable;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.smallmind.persistence.Durable;

public abstract class AbstractCacheDao, D extends Durable> implements CacheDao {

  private CacheDomain cacheDomain;

  public AbstractCacheDao (CacheDomain cacheDomain) {

    this.cacheDomain = cacheDomain;
  }

  public String getMetricSource () {

    return cacheDomain.getMetricSource();
  }

  public PersistenceCache getInstanceCache (Class durableClass) {

    return cacheDomain.getInstanceCache(durableClass);
  }

  public PersistenceCache getVectorCache (Class durableClass) {

    return cacheDomain.getVectorCache(durableClass);
  }

  public D get (Class durableClass, I id) {

    DurableKey durableKey = new DurableKey(durableClass, id);

    return getInstanceCache(durableClass).get(durableKey.getKey());
  }

  public Map, D> get (Class durableClass, List> durableKeys) {

    Map, D> resultMap = new HashMap, D>();

    if ((durableKeys != null) && (!durableKeys.isEmpty())) {

      HashMap> durableKeyMap = new HashMap>();
      Map valueMap;
      String[] keys = new String[durableKeys.size()];
      int index = 0;

      for (DurableKey durableKey : durableKeys) {
        keys[index] = durableKey.getKey();
        durableKeyMap.put(keys[index++], durableKey);
      }

      if ((valueMap = getInstanceCache(durableClass).get(keys)) != null) {
        for (Map.Entry resultEntry : valueMap.entrySet()) {
          resultMap.put(durableKeyMap.get(resultEntry.getKey()), resultEntry.getValue());
        }
      }
    }

    return resultMap;
  }

  public void delete (Class durableClass, D durable) {

    if (durable != null) {

      DurableKey durableKey = new DurableKey(durableClass, durable.getId());

      getInstanceCache(durableClass).remove(durableKey.getKey());
    }
  }

  public DurableVector getVector (VectorKey vectorKey) {

    return getVectorCache(vectorKey.getElementClass()).get(vectorKey.getKey());
  }

  public DurableVector persistVector (VectorKey vectorKey, DurableVector vector) {

    DurableVector migratedVector;
    DurableVector cachedVector;

    migratedVector = migrateVector(vectorKey.getElementClass(), vector);

    return ((cachedVector = getVectorCache(vectorKey.getElementClass()).putIfAbsent(vectorKey.getKey(), migratedVector, migratedVector.getTimeToLiveSeconds())) != null) ? cachedVector : vector;
  }

  public void deleteVector (VectorKey vectorKey) {

    getVectorCache(vectorKey.getElementClass()).remove(vectorKey.getKey());
  }
}