/*
* 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 MnodeEntry loadLocalEntryValue(HashKey key)
{
return _mnodeStore.load(key);
}
/**
* Sets a cache entry
*/
@Override
public MnodeEntry insertLocalValue(HashKey key,
MnodeEntry mnodeUpdate,
MnodeEntry oldEntryValue)
{
// MnodeUpdate mnodeUpdate = new MnodeUpdate(mnodeValue);
if (oldEntryValue == null
|| oldEntryValue.isImplicitNull()
|| oldEntryValue == MnodeEntry.NULL) {
if (_mnodeStore.insert(key, mnodeUpdate)) {
return mnodeUpdate;
} else {
log.fine(this + " db insert failed due to timing conflict"
+ "(key=" + key + ")");
return oldEntryValue;
}
} else {
if (_mnodeStore.updateSave(key.getHash(), mnodeUpdate)) {
return mnodeUpdate;
}
else if (_mnodeStore.insert(key, mnodeUpdate)) {
return mnodeUpdate;
}
else {
log.fine(this + " db update failed due to timing conflict"
+ "(key=" + key + ")");
return oldEntryValue;
}
}
}
@Override
public boolean putLocalValue(MnodeEntry mnodeValue,
HashKey key,
MnodeEntry oldEntryValue,
MnodeUpdate mnodeUpdate)
{
if (oldEntryValue == null
|| oldEntryValue.isImplicitNull()
|| oldEntryValue == MnodeEntry.NULL) {
if (_mnodeStore.insert(key, mnodeUpdate)) {
return true;
} else {
log.fine(this + " db insert failed due to timing conflict"
+ "(key=" + key + ", version=" + mnodeUpdate.getVersion() + ")");
}
} else {
if (_mnodeStore.updateSave(key.getHash(), mnodeUpdate)) {
return true;
}
else if (_mnodeStore.insert(key, mnodeUpdate)) {
return true;
}
else {
log.fine(this + " db update failed due to timing conflict"
+ "(key=" + key + ", version=" + mnodeUpdate.getVersion() + ")");
}
}
return false;
}
@Override
public MnodeEntry saveLocalUpdateTime(HashKey keyHash,
MnodeEntry mnodeValue,
MnodeEntry oldMnodeValue)
{
if (_mnodeStore.updateUpdateTime(keyHash,
mnodeValue.getVersion(),
mnodeValue.getAccessedExpireTimeout(),
mnodeValue.getLastModifiedTime())) {
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 java.sql.Blob loadBlob(HashKey valueHash)
{
return _dataStore.loadBlob(valueHash);
}
@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);
}
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;
DataStore dataStore = _dataStore;
_dataStore = null;
if (mnodeStore != null)
mnodeStore.close();
if (dataStore != null)
dataStore.destroy();
}
}