/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hp.hpl.jena.sdb.graph;
import java.sql.Connection;
import java.sql.SQLException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.hp.hpl.jena.graph.TransactionHandler;
import com.hp.hpl.jena.sdb.SDBException;
import com.hp.hpl.jena.sdb.sql.SDBConnection;
import com.hp.hpl.jena.sdb.sql.SDBExceptionSQL;
import com.hp.hpl.jena.shared.Command;
import com.hp.hpl.jena.shared.JenaException;
public class TransactionHandlerSDB implements TransactionHandler
{
static private Logger log = LoggerFactory.getLogger(TransactionHandlerSDB.class) ;
Connection sqlConnection ;
boolean inTransaction ;
public TransactionHandlerSDB(SDBConnection connection)
{
this.sqlConnection = connection.getSqlConnection() ;
this.inTransaction = false ;
}
@Override
public boolean transactionsSupported() { return true ; }
// Simplistic
@Override
public synchronized void begin()
{
if ( inTransaction )
{
log.warn("beginTransaction: Already in a transaction") ;
throw new SDBException("Already in transaction") ;
}
try {
sqlConnection.setAutoCommit(false) ;
inTransaction = true ;
} catch (SQLException ex) { new SDBExceptionSQL("begin", ex) ; }
}
@Override
public synchronized void commit()
{
if ( ! inTransaction )
{
log.warn("commit: Not in a transaction") ;
return ;
}
try {
sqlConnection.commit() ;
sqlConnection.setAutoCommit(true) ;
inTransaction = false ;
} catch (SQLException ex) { new SDBExceptionSQL("commit", ex) ; }
}
@Override
public synchronized void abort()
{
if ( ! inTransaction )
{
log.warn("abort: Not in a transaction") ;
return ;
}
try {
sqlConnection.rollback() ;
sqlConnection.setAutoCommit(true) ;
inTransaction = false ;
} catch (SQLException ex) { new SDBExceptionSQL("abort", ex) ; }
}
public synchronized void abortFinally()
{
// Abort if needed.
if ( ! inTransaction )
return ;
abort() ;
}
public void abortSilent()
{ try { abortFinally() ; } catch (SDBExceptionSQL ex) {} }
@Override
public Object executeInTransaction(Command c)
{
try {
begin() ;
Object result = c.execute();
commit();
return result;
}
catch (SDBExceptionSQL e) { abortFinally() ; throw e ; }
catch (JenaException e) { abortFinally() ; throw e ; }
catch (Throwable e) { abortFinally() ; throw new SDBException(e) ; } // Pass Graph tests.
}
}