/*
* Copyright (C) 2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.services.jcr.storage.value;
import org.exoplatform.services.jcr.datamodel.ValueData;
import org.exoplatform.services.jcr.impl.dataflow.SpoolConfig;
import org.exoplatform.services.jcr.impl.dataflow.ValueDataUtil.ValueDataWrapper;
import org.exoplatform.services.jcr.impl.dataflow.persistent.ChangedSizeHandler;
import org.exoplatform.services.jcr.impl.storage.value.ValueDataNotFoundException;
import java.io.IOException;
/**
* Created by The eXo Platform SAS.
*
* @author <a href="mailto:gennady.azarenkov@exoplatform.com">Gennady Azarenkov</a>
* @version $Id: ValueIOChannel.java 14100 2008-05-12 10:53:47Z gazarenkov $
*/
public interface ValueIOChannel
{
/**
* Read Property value.
*
* @param propertyId
* - Property ID
* @param orderNumber
* value data order number
* @param type
* property type
* @param spoolConfig
* spool configuration
* @return ValueData
* @throws IOException
* if error occurs
*/
ValueDataWrapper read(String propertyId, int orderNumber, int type, SpoolConfig spoolConfig)
throws IOException;
/**
* Inspects whether corresponding resource exists in value storage or not.
*
* @param propertyId
* Property ID
* @param orderNumber
* Property order number
* @throws ValueDataNotFoundException is thrown if file not exist
* @throws IOException is thrown if another IO error is occurred
*/
void checkValueData(String propertyId, int orderNumber) throws ValueDataNotFoundException, IOException;
/**
* Repairs the value data generally by setting the resource to an empty content.
*
* @param propertyId
* Property ID
* @param orderNumber
* Property order number
* @throws IOException is thrown if can not create new empty file
*/
void repairValueData(String propertyId, int orderNumber) throws IOException;
/**
* Returns value data size.
*
* @param propertyId
* Property ID
* @param orderNumber
* Property order number
* @throws IOException is thrown if can not create new empty file
*/
long getValueSize(String propertyId, int orderNumber) throws IOException;
/**
* Returns value data size. Property may contains several values
* differing only order number. This method returns value size
* of them. For specific value use {@link #getValueSize(String, int)}
*
* @param propertyId
* Property ID
* @throws IOException is thrown if can not create new empty file
*/
long getValueSize(String propertyId) throws IOException;
/**
* Add or update Property value.
*
* @param propertyId
* - Property ID
* @param data
* - ValueData
* @param sizeHandler
* accumulates size changing
* @throws IOException
* if error occurs
*/
void write(String propertyId, ValueData data, ChangedSizeHandler sizeHandler) throws IOException;
/**
* Delete Property all values.
*
* @param propertyId
* - Property ID
* @throws IOException
* if error occurs
*/
void delete(String propertyId) throws IOException;
/**
* Closes channel.
*/
void close();
/**
* Return this value storage id.
*/
String getStorageId();
/**
* Prepare channel changes.
*
* @throws IOException
* if error occurs
*/
void prepare() throws IOException;
/**
* Commit channel changes (one phase).
*
* @throws IOException
* if error occurs
*/
void commit() throws IOException;
/**
* Commit channel changes (two phases).
*
* @throws IOException
* if error occurs
*/
void twoPhaseCommit() throws IOException;
/**
* Rollback channel changes.
*
* @throws IOException
* if error occurs
*/
void rollback() throws IOException;
}