/**
    * This file Copyright (c) 2010-2010 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.cms.cache.pages;
  
  import info.magnolia.cms.beans.config.ContentRepository;
  import info.magnolia.cms.util.AlertUtil;
  import info.magnolia.context.MgnlContext;
  import info.magnolia.module.ModuleRegistry;
  import info.magnolia.module.admininterface.TemplatedMVCHandler;
  import info.magnolia.module.cache.CacheConfiguration;
  import info.magnolia.module.cache.CacheFactory;
  import info.magnolia.module.cache.CacheModule;
  import info.magnolia.module.cache.commands.FlushCachesCommand;
  import info.magnolia.module.cache.commands.FlushFromCachesByUUIDCommand;
  import info.magnolia.module.cache.commands.FlushNamedCacheCommand;
  
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  /**
   * Tools page to show cache info and flush caches.
   * 
   * @author Bert Leunis
   */
  public class CacheToolsPage extends TemplatedMVCHandler {
  
      private final CacheModule cacheModule;
  
      public CacheToolsPage(String name, HttpServletRequest request, HttpServletResponse response) {
          super(name, request, response);
          cacheModule = ModuleRegistry.Factory.getInstance().getModuleInstance(CacheModule.class);
      }
  
      public String refresh() {
          return this.show();
      }
  
      public String flushNamedCache() {
          try {
              AlertUtil.setMessage(flushNamedCacheCommand());
          }
          catch (Exception e) {
              AlertUtil.setMessage("Error when flushing cache: " + e.getMessage(), e);
          }
          return this.show();
      }
  
      private String flushNamedCacheCommand() {
          FlushNamedCacheCommand command = new FlushNamedCacheCommand();
          try {
              command.execute(MgnlContext.getInstance());
          } catch (Exception e) {
              return "Error occurred during command execution. (" + e.getMessage() +")";
          }
  
          return "Cache \"" + MgnlContext.getParameter(FlushNamedCacheCommand.CACHE_NAME) + "\" is flushed.";
      }
  
      public String flushByUUID() {
          try {
              AlertUtil.setMessage(flushByUUIDCommand());
          }
          catch (Exception e) {
             AlertUtil.setMessage("Error when flushing by uuid: " + e.getMessage(), e);
         }
         return this.show();
     }
 
     private String flushByUUIDCommand() {
         FlushFromCachesByUUIDCommand command = new FlushFromCachesByUUIDCommand();
         try {
             command.execute(MgnlContext.getInstance());
         } catch (Exception e) {
             return "Error occurred during command execution. (" + e.getMessage() +")";
         }
         return "UUID \"" + MgnlContext.getParameter(FlushFromCachesByUUIDCommand.UUID) + "\" is flushed from cache.";
     }
 
     public String flushAllCaches() {
         try {
             AlertUtil.setMessage(flushAllCacheCommand());
         }
         catch (Exception e) {
             AlertUtil.setMessage("Error when flushing all caches: " + e.getMessage(), e);
         }
         return this.show();
     }
 
     private String flushAllCacheCommand() {
         FlushCachesCommand command = new FlushCachesCommand();
         try {
             command.execute(MgnlContext.getInstance());
         } catch (Exception e) {
             return "Error occurred during command execution. (" + e.getMessage() +")";
         }
         return "All caches are flushed.";
     }
 
     public Map<String, Integer> getCacheSizes() {
         Map<String, Integer> cacheNames = new HashMap<String, Integer>();
         CacheFactory factory = cacheModule.getCacheFactory();
         Collection<CacheConfiguration> cacheConfigs = cacheModule.getConfigurations().values();
         for (CacheConfiguration config : cacheConfigs) {
             String cacheName = config.getName();
             cacheNames.put(cacheName, factory.getCache(cacheName).getSize());
         }
         return cacheNames;
     }
 
     public Iterator getRepositories() {
         return ContentRepository.getAllRepositoryNames();
     }
 
 }