Package com.caucho.server.distcache

Source Code of com.caucho.server.distcache.CacheDataBackingImpl

/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT.  See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
*   Free Software Foundation, Inc.
*   59 Temple Place, Suite 330
*   Boston, MA 02111-1307  USA
*
* @author Scott Ferguson
*/

package com.caucho.server.distcache;

import java.io.IOException;
import java.util.ArrayList;
import java.util.logging.Logger;

import javax.sql.DataSource;

import com.caucho.config.ConfigException;
import com.caucho.db.jdbc.DataSourceImpl;
import com.caucho.env.distcache.CacheDataBacking;
import com.caucho.env.service.ResinSystem;
import com.caucho.env.service.RootDirectorySystem;
import com.caucho.util.HashKey;
import com.caucho.vfs.Path;
import com.caucho.vfs.StreamSource;
import com.caucho.vfs.WriteStream;

/**
* Manages the distributed cache
*/
public class CacheDataBackingImpl implements CacheDataBacking {
  private static final Logger log
    = Logger.getLogger(CacheDataBackingImpl.class.getName());
 
  private DataStore _dataStore;
  private MnodeStore _mnodeStore;
 
  public CacheDataBackingImpl()
  {
  }
 
  public void setDataStore(DataStore dataStore)
  {
    _dataStore = dataStore;
  }
 
  public void setMnodeStore(MnodeStore mnodeStore)
  {
    _mnodeStore = mnodeStore;
  }
 
  @Override
  public DataStore getDataStore()
  {
    return _dataStore;
  }
 
  @Override
  public MnodeStore getMnodeStore()
  {
    return _mnodeStore;
  }

  /**
   * Returns the local value from the database
   */
  @Override
  public MnodeValue loadLocalEntryValue(HashKey key)
  {
    return _mnodeStore.load(key);
  }

  /**
   * Sets a cache entry
   */
  @Override
  public MnodeValue insertLocalValue(HashKey key,
                                     MnodeValue mnodeValue,
                                     MnodeValue oldEntryValue,
                                     long timeout)
  {
    if (oldEntryValue == null
        || oldEntryValue.isImplicitNull()
        || oldEntryValue == MnodeValue.NULL) {
      if (_mnodeStore.insert(key, mnodeValue.getValueHashKey(),
                             mnodeValue.getCacheHashKey(),
                             mnodeValue.getFlags(),
                             mnodeValue.getVersion(),
                             mnodeValue.getExpireTimeout(),
                             mnodeValue.getIdleTimeout(),
                             mnodeValue.getLeaseTimeout(),
                             mnodeValue.getLocalReadTimeout())) {
        return mnodeValue;
      } else {
        log.fine(this + " db insert failed due to timing conflict"
                 + "(key=" + key + ")");

        return oldEntryValue;
      }
    } else {
      if (_mnodeStore.updateSave(key, mnodeValue.getValueHashKey(),
                                      mnodeValue.getVersion(), timeout)) {
        return mnodeValue;
      }
      else if (_mnodeStore.insert(key, mnodeValue.getValueHashKey(),
                                  mnodeValue.getCacheHashKey(),
                                  mnodeValue.getFlags(),
                                  mnodeValue.getVersion(),
                                  mnodeValue.getExpireTimeout(),
                                  mnodeValue.getIdleTimeout(),
                                  mnodeValue.getLeaseTimeout(),
                                  mnodeValue.getLocalReadTimeout())) {
        return mnodeValue;
      }
      else {
        log.fine(this + " db update failed due to timing conflict"
                 + "(key=" + key + ")");

        return oldEntryValue;
      }
    }
  }

  public MnodeValue putLocalValue(MnodeValue mnodeValue,
                                  HashKey key,
                                  MnodeValue oldEntryValue,
                                  long version,
                                  HashKey valueHash,
                                  Object value,
                                  HashKey cacheHash,
                                  int flags,
                                  long expireTimeout,
                                  long idleTimeout,
                                  long leaseTimeout,
                                  long localReadTimeout,
                                  int leaseOwner)
  {
    if (oldEntryValue == null
        || oldEntryValue.isImplicitNull()
        || oldEntryValue == MnodeValue.NULL) {
      if (_mnodeStore.insert(key, valueHash, cacheHash,
                             flags, version,
                             expireTimeout,
                             idleTimeout,
                             leaseTimeout,
                             localReadTimeout)) {
        return mnodeValue;
      } else {
        log.fine(this + " db insert failed due to timing conflict"
                 + "(key=" + key + ", version=" + version + ")");
      }
    } else {
      if (_mnodeStore.updateSave(key, valueHash, version, idleTimeout)) {
        return mnodeValue;
      }
      else if (_mnodeStore.insert(key, valueHash, cacheHash,
                                  flags, version,
                                  expireTimeout,
                                  idleTimeout,
                                  leaseTimeout,
                                  localReadTimeout)) {
        return mnodeValue;
      }
      else {
        log.fine(this + " db update failed due to timing conflict"
                 + "(key=" + key + ", version=" + version + ")");
      }
    }

    return null;
  }
 
  @Override
  public  MnodeValue saveLocalUpdateTime(HashKey keyHash,
                                         MnodeValue mnodeValue,
                                         MnodeValue oldMnodeValue)
  {
    if (_mnodeStore.updateUpdateTime(keyHash,
                                     mnodeValue.getVersion(),
                                     mnodeValue.getIdleTimeout(),
                                     mnodeValue.getLastUpdateTime())) {
      return mnodeValue;
    } else {
      log.fine(this + " db updateTime failed due to timing conflict"
               + "(key=" + keyHash + ", version=" + mnodeValue.getVersion() + ")");

      return oldMnodeValue;
    }
  }

  @Override
  public boolean loadData(HashKey valueHash, WriteStream os)
    throws IOException
  {
    return _dataStore.load(valueHash, os);
  }
 
  @Override
  public boolean saveData(HashKey valueHash, StreamSource source, int length)
    throws IOException
  {
    return _dataStore.save(valueHash, source, length);
  }

  @Override
  public boolean isDataAvailable(HashKey valueKey)
  {
    if (valueKey == null || valueKey == HashManager.NULL)
      return false;

    return _dataStore.isDataAvailable(valueKey);
  }

  /**
   * Returns the last update time on server startup.
   */
  @Override
  public long getStartupLastUpdateTime()
  {
    return _mnodeStore.getStartupLastUpdateTime();
  }

  /**
   * Returns the last update time on server startup.
   */
  @Override
  public long getStartupLastUpdateTime(HashKey cacheKey)
  {
    return _mnodeStore.getStartupLastUpdateTime(cacheKey);
  }

  /**
   * Returns a set of entries since an access time.
   */
  @Override
  public ArrayList<CacheData> getUpdates(long accessTime, int offset)
  {
    return _mnodeStore.getUpdates(accessTime, offset);
  }

  /**
   * Returns a set of entries since an access time.
   */
  @Override
  public ArrayList<CacheData> getUpdates(HashKey cacheKey,
                                         long accessTime,
                                         int offset)
  {
    return _mnodeStore.getUpdates(cacheKey, accessTime, offset);
  }

  /**
   * Returns a set of entries since an access time.
   */
  @Override
  public ArrayList<CacheData> getGlobalUpdates(long accessTime, int offset)
  {
    return _mnodeStore.getGlobalUpdates(accessTime, offset);
  }
 
  public void start()
  {
    try {
      Path dataDirectory = RootDirectorySystem.getCurrentDataDirectory();

      String serverId = ResinSystem.getCurrentId();


      if (serverId.isEmpty())
        serverId = "default";
     
      DataSource dataSource = createDataSource(dataDirectory, serverId);
      String tableName = "mnode";

      _mnodeStore = new MnodeStore(dataSource, tableName, serverId);
      _mnodeStore.init();
     
      _dataStore = new DataStore(serverId, _mnodeStore);
      _dataStore.init();
    } catch (Exception e) {
      throw ConfigException.create(e);
    }
  }
 
  private DataSource createDataSource(Path dataDirectory, String serverId)
  {
    Path path = dataDirectory.lookup("distcache");

    if (path == null)
      throw new NullPointerException();

    try {
      path.mkdirs();
    } catch (IOException e) {
    }

    try {
      DataSourceImpl dataSource = new DataSourceImpl();
      dataSource.setPath(path);
      dataSource.setRemoveOnError(true);
      dataSource.init();

      return dataSource;
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }
  @Override
  public void close()
  {
    MnodeStore mnodeStore = _mnodeStore;
    _mnodeStore = null;
   
    if (mnodeStore != null)
      mnodeStore.close();
    // _dataStore.close();
  }
}
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