/*
* Copyright (c) 2002-2009 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.transaction;
import java.util.Iterator;
import java.util.logging.Logger;
import javax.transaction.HeuristicMixedException;
import javax.transaction.NotSupportedException;
import javax.transaction.RollbackException;
import javax.transaction.Status;
import javax.transaction.SystemException;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import javax.transaction.xa.XAException;
import javax.transaction.xa.XAResource;
import org.neo4j.kernel.impl.core.ReadOnlyDbException;
import org.neo4j.kernel.impl.transaction.xaframework.XaResource;
import org.neo4j.kernel.impl.util.ArrayMap;
class ReadOnlyTxManager implements TransactionManager
{
private static Logger log = Logger.getLogger( ReadOnlyTxManager.class.getName() );
private ArrayMap<Thread,ReadOnlyTransactionImpl> txThreadMap;
private int eventIdentifierCounter = 0;
private XaDataSourceManager xaDsManager = null;
ReadOnlyTxManager()
{
}
synchronized int getNextEventIdentifier()
{
return eventIdentifierCounter++;
}
void stop()
{
}
void init( XaDataSourceManager xaDsManagerToUse )
{
this.xaDsManager = xaDsManagerToUse;
txThreadMap = new ArrayMap<Thread,ReadOnlyTransactionImpl>( 5, true, true );
}
public void begin() throws NotSupportedException
{
Thread thread = Thread.currentThread();
ReadOnlyTransactionImpl tx = txThreadMap.get( thread );
if ( tx != null )
{
throw new NotSupportedException(
"Nested transactions not supported" );
}
tx = new ReadOnlyTransactionImpl( this );
txThreadMap.put( thread, tx );
}
public void commit() throws RollbackException, HeuristicMixedException,
IllegalStateException
{
Thread thread = Thread.currentThread();
ReadOnlyTransactionImpl tx = txThreadMap.get( thread );
if ( tx == null )
{
throw new IllegalStateException( "Not in transaction" );
}
if ( tx.getStatus() != Status.STATUS_ACTIVE
&& tx.getStatus() != Status.STATUS_MARKED_ROLLBACK )
{
throw new IllegalStateException( "Tx status is: "
+ getTxStatusAsString( tx.getStatus() ) );
}
tx.doBeforeCompletion();
if ( tx.getStatus() == Status.STATUS_ACTIVE )
{
commit( thread, tx );
}
else if ( tx.getStatus() == Status.STATUS_MARKED_ROLLBACK )
{
rollbackCommit( thread, tx );
}
else
{
throw new IllegalStateException( "Tx status is: "
+ getTxStatusAsString( tx.getStatus() ) );
}
}
private void commit( Thread thread, ReadOnlyTransactionImpl tx )
{
if ( tx.getResourceCount() == 0 )
{
tx.setStatus( Status.STATUS_COMMITTED );
}
else
{
throw new ReadOnlyDbException();
}
tx.doAfterCompletion();
txThreadMap.remove( thread );
tx.setStatus( Status.STATUS_NO_TRANSACTION );
}
private void rollbackCommit( Thread thread, ReadOnlyTransactionImpl tx )
throws HeuristicMixedException, RollbackException
{
try
{
tx.doRollback();
}
catch ( XAException e )
{
e.printStackTrace();
log.severe( "Unable to rollback marked transaction. "
+ "Some resources may be commited others not. "
+ "Neo4j kernel should be SHUTDOWN for "
+ "resource maintance and transaction recovery ---->" );
throw new HeuristicMixedException( "Unable to rollback "
+ " ---> error code for rollback: " + e.errorCode );
}
tx.doAfterCompletion();
txThreadMap.remove( thread );
tx.setStatus( Status.STATUS_NO_TRANSACTION );
throw new RollbackException(
"Failed to commit, transaction rolledback" );
}
public void rollback() throws IllegalStateException, SystemException
{
Thread thread = Thread.currentThread();
ReadOnlyTransactionImpl tx = txThreadMap.get( thread );
if ( tx == null )
{
throw new IllegalStateException( "Not in transaction" );
}
if ( tx.getStatus() == Status.STATUS_ACTIVE ||
tx.getStatus() == Status.STATUS_MARKED_ROLLBACK ||
tx.getStatus() == Status.STATUS_PREPARING )
{
tx.doBeforeCompletion();
try
{
tx.doRollback();
}
catch ( XAException e )
{
e.printStackTrace();
log.severe( "Unable to rollback marked or active transaction. "
+ "Some resources may be commited others not. "
+ "Neo4j kernel should be SHUTDOWN for "
+ "resource maintance and transaction recovery ---->" );
throw new SystemException( "Unable to rollback "
+ " ---> error code for rollback: " + e.errorCode );
}
tx.doAfterCompletion();
txThreadMap.remove( thread );
tx.setStatus( Status.STATUS_NO_TRANSACTION );
}
else
{
throw new IllegalStateException( "Tx status is: "
+ getTxStatusAsString( tx.getStatus() ) );
}
}
public int getStatus()
{
Thread thread = Thread.currentThread();
ReadOnlyTransactionImpl tx = txThreadMap.get( thread );
if ( tx != null )
{
return tx.getStatus();
}
return Status.STATUS_NO_TRANSACTION;
}
public Transaction getTransaction()
{
return txThreadMap.get( Thread.currentThread() );
}
public void resume( Transaction tx ) throws IllegalStateException
{
Thread thread = Thread.currentThread();
if ( txThreadMap.get( thread ) != null )
{
throw new IllegalStateException( "Transaction already associated" );
}
if ( tx != null )
{
ReadOnlyTransactionImpl txImpl = (ReadOnlyTransactionImpl) tx;
if ( txImpl.getStatus() != Status.STATUS_NO_TRANSACTION )
{
txImpl.markAsActive();
txThreadMap.put( thread, txImpl );
}
}
}
public Transaction suspend()
{
ReadOnlyTransactionImpl tx = txThreadMap.remove( Thread.currentThread() );
if ( tx != null )
{
tx.markAsSuspended();
}
return tx;
}
public void setRollbackOnly() throws IllegalStateException
{
Thread thread = Thread.currentThread();
ReadOnlyTransactionImpl tx = txThreadMap.get( thread );
if ( tx == null )
{
throw new IllegalStateException( "Not in transaction" );
}
tx.setRollbackOnly();
}
public void setTransactionTimeout( int seconds )
{
}
byte[] getBranchId( XAResource xaRes )
{
if ( xaRes instanceof XaResource )
{
byte branchId[] = ((XaResource) xaRes).getBranchId();
if ( branchId != null )
{
return branchId;
}
}
return xaDsManager.getBranchId( xaRes );
}
XAResource getXaResource( byte branchId[] )
{
return xaDsManager.getXaResource( branchId );
}
String getTxStatusAsString( int status )
{
switch ( status )
{
case Status.STATUS_ACTIVE:
return "STATUS_ACTIVE";
case Status.STATUS_NO_TRANSACTION:
return "STATUS_NO_TRANSACTION";
case Status.STATUS_PREPARING:
return "STATUS_PREPARING";
case Status.STATUS_PREPARED:
return "STATUS_PREPARED";
case Status.STATUS_COMMITTING:
return "STATUS_COMMITING";
case Status.STATUS_COMMITTED:
return "STATUS_COMMITED";
case Status.STATUS_ROLLING_BACK:
return "STATUS_ROLLING_BACK";
case Status.STATUS_ROLLEDBACK:
return "STATUS_ROLLEDBACK";
case Status.STATUS_UNKNOWN:
return "STATUS_UNKNOWN";
case Status.STATUS_MARKED_ROLLBACK:
return "STATUS_MARKED_ROLLBACK";
default:
return "STATUS_UNKNOWN(" + status + ")";
}
}
public synchronized void dumpTransactions()
{
Iterator<ReadOnlyTransactionImpl> itr = txThreadMap.values().iterator();
if ( !itr.hasNext() )
{
System.out.println( "No uncompleted transactions" );
return;
}
System.out.println( "Uncompleted transactions found: " );
while ( itr.hasNext() )
{
System.out.println( itr.next() );
}
}
public int getEventIdentifier()
{
TransactionImpl tx = (TransactionImpl) getTransaction();
if ( tx != null )
{
return tx.getEventIdentifier();
}
return -1;
}
}