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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.emf.cdo.server.internal.db;
import org.eclipse.emf.cdo.protocol.CDOID;
import org.eclipse.emf.cdo.protocol.model.CDOClass;
import org.eclipse.emf.cdo.protocol.model.CDOClassRef;
import org.eclipse.emf.cdo.server.db.IDBStoreReader;
import org.eclipse.emf.cdo.server.db.IDBStoreWriter;
import org.eclipse.emf.cdo.server.db.IObjectTypeCache;
import org.eclipse.net4j.db.DBException;
import org.eclipse.net4j.db.DBType;
import org.eclipse.net4j.db.DBUtil;
import org.eclipse.net4j.db.IDBAdapter;
import org.eclipse.net4j.db.IDBField;
import org.eclipse.net4j.db.IDBIndex;
import org.eclipse.net4j.db.IDBSchema;
import org.eclipse.net4j.db.IDBTable;
import org.eclipse.net4j.internal.util.lifecycle.Lifecycle;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* @author Eike Stepper
*/
public class ObjectTypeCache extends Lifecycle implements IObjectTypeCache
{
private MappingStrategy mappingStrategy;
private IDBTable table;
private IDBField idField;
private IDBField typeField;
private transient Object initializeLock = new Object();
public ObjectTypeCache()
{
}
public MappingStrategy getMappingStrategy()
{
return mappingStrategy;
}
public void setMappingStrategy(MappingStrategy mappingStrategy)
{
this.mappingStrategy = mappingStrategy;
}
public CDOClassRef getObjectType(IDBStoreReader storeReader, CDOID id)
{
Statement statement = storeReader.getStatement();
initialize(statement);
StringBuilder builder = new StringBuilder();
builder.append("SELECT ");
builder.append(typeField);
builder.append(" FROM ");
builder.append(table);
builder.append(" WHERE ");
builder.append(idField);
builder.append("=");
builder.append(id.getValue());
String sql = builder.toString();
DBUtil.trace(sql);
ResultSet resultSet = null;
try
{
resultSet = statement.executeQuery(sql);
if (!resultSet.next())
{
return null;
}
int classID = resultSet.getInt(1);
return mappingStrategy.getClassRef(storeReader, classID);
}
catch (SQLException ex)
{
throw new DBException(ex);
}
finally
{
DBUtil.close(resultSet);
}
}
public void putObjectType(IDBStoreWriter storeWriter, CDOID id, CDOClass type)
{
Statement statement = storeWriter.getStatement();
initialize(statement);
StringBuilder builder = new StringBuilder();
builder.append("INSERT INTO ");
builder.append(table);
builder.append(" VALUES (");
builder.append(id.getValue());
builder.append(", ");
builder.append(ClassServerInfo.getDBID(type));
builder.append(")");
String sql = builder.toString();
DBUtil.trace(sql);
try
{
statement.execute(sql);
if (statement.getUpdateCount() != 1)
{
throw new DBException("Object type not inserted: " + id + " -> " + type);
}
}
catch (SQLException ex)
{
throw new DBException(ex);
}
}
private void initialize(Statement statement)
{
synchronized (initializeLock)
{
if (table == null)
{
IDBSchema schema = mappingStrategy.getStore().getSchema();
table = schema.addTable(CDODBSchema.CDO_OBJECTS);
idField = table.addField(CDODBSchema.ATTRIBUTES_ID, DBType.BIGINT);
typeField = table.addField(CDODBSchema.ATTRIBUTES_CLASS, DBType.INTEGER);
table.addIndex(IDBIndex.Type.PRIMARY_KEY, idField);
IDBAdapter dbAdapter = mappingStrategy.getStore().getDBAdapter();
dbAdapter.createTable(table, statement);
}
}
}
@Override
protected void doBeforeActivate() throws Exception
{
super.doBeforeActivate();
checkState(mappingStrategy, "mappingStrategy");
}
@Override
protected void doDeactivate() throws Exception
{
table = null;
idField = null;
typeField = null;
super.doDeactivate();
}
}
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