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/*
* Copyright (c) 2004 - 2012 Eike Stepper (Berlin, Germany) and others.
* 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.net4j.internal.db;
import org.eclipse.net4j.db.DBException;
import org.eclipse.net4j.db.DBUtil;
import org.eclipse.net4j.db.IDBConnectionProvider;
import org.eclipse.net4j.db.IDBPreparedStatement;
import org.eclipse.net4j.db.IDBPreparedStatement.ReuseProbability;
import org.eclipse.net4j.db.IDBSchemaTransaction;
import org.eclipse.net4j.db.IDBTransaction;
import org.eclipse.net4j.util.CheckUtil;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.HashSet;
import java.util.NavigableMap;
import java.util.Set;
import java.util.TreeMap;
/**
* @author Eike Stepper
*/
public final class DBTransaction implements IDBTransaction
{
private final DBDatabase database;
private final NavigableMap<String, DBPreparedStatement> cache = new TreeMap<String, DBPreparedStatement>();
private final Set<DBPreparedStatement> checkOuts = new HashSet<DBPreparedStatement>();
private int lastTouch;
private Connection connection;
public DBTransaction(DBDatabase database)
{
this.database = database;
IDBConnectionProvider connectionProvider = database.getConnectionProvider();
connection = connectionProvider.getConnection();
if (connection == null)
{
throw new DBException("No connection from connection provider: " + connectionProvider);
}
try
{
connection.setAutoCommit(false);
}
catch (SQLException ex)
{
throw new DBException(ex, "SET AUTO COMMIT = false");
}
}
public DBDatabase getDatabase()
{
return database;
}
public void close()
{
DBUtil.close(connection);
connection = null;
database.closeTransaction(this);
}
public boolean isClosed()
{
return connection != null;
}
public Connection getConnection()
{
return connection;
}
public IDBSchemaTransaction openSchemaTransaction()
{
DBSchemaTransaction schemaTransaction = database.openSchemaTransaction();
schemaTransaction.setTransaction(this);
return schemaTransaction;
}
public IDBPreparedStatement prepareStatement(String sql, ReuseProbability reuseProbability)
{
database.beginSchemaAccess(false);
DBPreparedStatement preparedStatement = cache.remove(sql);
if (preparedStatement == null)
{
try
{
PreparedStatement delegate = connection.prepareStatement(sql);
preparedStatement = new DBPreparedStatement(this, sql, reuseProbability, delegate);
}
catch (SQLException ex)
{
throw new DBException(ex);
}
}
checkOuts.add(preparedStatement);
return preparedStatement;
}
public void releasePreparedStatement(DBPreparedStatement preparedStatement)
{
try
{
if (preparedStatement == null)
{
// Bug 276926: Silently accept preparedStatement == null and do nothing.
return;
}
checkOuts.remove(preparedStatement);
preparedStatement.setTouch(++lastTouch);
String sql = preparedStatement.getSQL();
if (cache.put(sql, preparedStatement) != null)
{
throw new IllegalStateException(sql + " already in cache"); //$NON-NLS-1$
}
if (cache.size() > database.getStatementCacheCapacity())
{
DBPreparedStatement old = cache.remove(cache.firstKey());
DBUtil.close(old.getDelegate());
}
}
finally
{
database.endSchemaAccess();
}
}
public void invalidateStatementCache()
{
CheckUtil.checkState(checkOuts.isEmpty(), "Statements are checked out: " + checkOuts);
// Close all statements in the cache, then clear the cache.
for (DBPreparedStatement preparedStatement : cache.values())
{
PreparedStatement delegate = preparedStatement.getDelegate();
DBUtil.close(delegate);
}
cache.clear();
}
}
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