/*
 *  Copyright 2004 Clinton Begin
 *
 *  Licensed 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 com.ibatis.sqlmap.engine.cache.oscache;

import com.ibatis.sqlmap.engine.cache.CacheController;
import com.ibatis.sqlmap.engine.cache.CacheModel;
import com.opensymphony.oscache.base.NeedsRefreshException;
import com.opensymphony.oscache.general.GeneralCacheAdministrator;

import java.util.Properties;

/**
 * Cache implementation for using OSCache with iBATIS
 */
public class OSCacheController implements CacheController {

  private static final GeneralCacheAdministrator CACHE = new GeneralCacheAdministrator();

  public void flush(CacheModel cacheModel) {
    CACHE.flushGroup(cacheModel.getId());
  }

  public Object getObject(CacheModel cacheModel, Object key) {
    String keyString = key.toString();
    try {
      int refreshPeriod = (int) (cacheModel.getFlushIntervalSeconds());
      return CACHE.getFromCache(keyString, refreshPeriod);
    } catch (NeedsRefreshException e) {
      CACHE.cancelUpdate(keyString);
      return null;
    }
  }

  public Object removeObject(CacheModel cacheModel, Object key) {
    Object result;
    String keyString = key.toString();
    try {
      int refreshPeriod = (int) (cacheModel.getFlushIntervalSeconds());
      Object value = CACHE.getFromCache(keyString, refreshPeriod);
      if (value != null) {
        CACHE.flushEntry(keyString);
      }
      result = value;
    } catch (NeedsRefreshException e) {
      try {
        CACHE.flushEntry(keyString);
      } finally {
        CACHE.cancelUpdate(keyString);
        result = null;
      }
    }
    return result;
  }

  public void putObject(CacheModel cacheModel, Object key, Object object) {
    String keyString = key.toString();
    CACHE.putInCache(keyString, object, new String[]{cacheModel.getId()});
  }

  public void configure(Properties props) {
  }

}