/*
* 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.tdb.transaction;
import static org.apache.jena.atlas.logging.Log.warn ;
import java.nio.ByteBuffer ;
import java.util.Iterator ;
import org.apache.jena.atlas.iterator.Iter ;
import org.apache.jena.atlas.lib.ByteBufferLib ;
import org.apache.jena.atlas.lib.Pair ;
import org.slf4j.Logger ;
import org.slf4j.LoggerFactory ;
import com.hp.hpl.jena.graph.Node ;
import com.hp.hpl.jena.tdb.TDBException ;
import com.hp.hpl.jena.tdb.base.objectfile.ObjectFile ;
import com.hp.hpl.jena.tdb.base.record.Record ;
import com.hp.hpl.jena.tdb.index.Index ;
import com.hp.hpl.jena.tdb.nodetable.NodeTable ;
import com.hp.hpl.jena.tdb.nodetable.NodeTableCache ;
import com.hp.hpl.jena.tdb.nodetable.NodeTableInline ;
import com.hp.hpl.jena.tdb.nodetable.NodeTableNative ;
import com.hp.hpl.jena.tdb.store.NodeId ;
public class NodeTableTrans implements NodeTable, TransactionLifecycle
{
private static Logger log = LoggerFactory.getLogger(NodeTableTrans.class) ;
// TODO flag to note is any work is needed on commit.
private final NodeTable base ;
private long allocOffset ;
private NodeTable nodeTableJournal = null ;
private static int CacheSize = 10000 ; // [TxTDB:TODO] Make configurable
private boolean passthrough = false ;
private Index nodeIndex ;
private ObjectFile journalObjFile ;
// Start of the journal file for this transaction.
// Always zero currently but allows for future
private long journalObjFileStartOffset ;
private final String label ;
private final Transaction txn ; // Can be null (during recovery).
public NodeTableTrans(Transaction txn, String label, NodeTable sub, Index nodeIndex, ObjectFile objFile)
{
this.txn = txn ;
this.base = sub ;
this.nodeIndex = nodeIndex ;
this.journalObjFile = objFile ;
// Clear bytes from an old run
// (a crash while writing means the old transaction did not commit
// any bytes in the file are junk)
// This is coupled to the fact the prepare phase does the actually data writing.
journalObjFile.truncate(0) ;
this.label = label ;
}
public void setPassthrough(boolean v) { passthrough = v ; }
public NodeTable getBaseNodeTable() { return base ; }
public NodeTable getJournalTable() { return nodeTableJournal ; }
public Transaction getTransaction() { return txn ; }
@Override
public NodeId getAllocateNodeId(Node node)
{
if ( passthrough ) return base.getAllocateNodeId(node) ;
NodeId nodeId = getNodeIdForNode(node) ;
if ( ! NodeId.isDoesNotExist(nodeId) )
return nodeId ;
// add to journal
nodeId = allocate(node) ;
return nodeId ;
}
@Override
public NodeId getNodeIdForNode(Node node)
{
if ( node == Node.ANY )
return NodeId.NodeIdAny ;
if ( passthrough ) return base.getNodeIdForNode(node) ;
NodeId nodeId = nodeTableJournal.getNodeIdForNode(node) ;
if ( ! NodeId.isDoesNotExist(nodeId) )
return mapFromJournal(nodeId) ;
nodeId = base.getNodeIdForNode(node) ;
return nodeId ;
}
@Override
public Node getNodeForNodeId(NodeId id)
{
if ( NodeId.isAny(id) )
return Node.ANY ;
if ( passthrough ) return base.getNodeForNodeId(id) ;
long x = id.getId() ;
if ( x < allocOffset )
return base.getNodeForNodeId(id) ;
id = mapToJournal(id) ;
Node node = nodeTableJournal.getNodeForNodeId(id) ;
return node ;
}
/** Convert from a id to the id in the "journal" file */
private NodeId mapToJournal(NodeId id)
{
if ( passthrough )
throw new TDBTransactionException("Not in an active transaction") ;
if ( NodeId.isInline(id) )
return id ;
return NodeId.create(id.getId()-allocOffset) ;
}
/** Convert from a id in other to an external id */
private NodeId mapFromJournal(NodeId id)
{
if ( passthrough )
throw new TDBTransactionException("Not in an active transaction") ;
if ( NodeId.isInline(id) )
return id ;
return NodeId.create(id.getId()+allocOffset) ;
}
private NodeId allocate(Node node)
{
NodeId nodeId = nodeTableJournal.getAllocateNodeId(node) ;
nodeId = mapFromJournal(nodeId) ;
return nodeId ;
}
@Override
public NodeId allocOffset()
{
if ( passthrough ) return base.allocOffset() ;
// If we have done the append stage, this is invalid as the base may change under our feet
// Would need to track base operations.
NodeId x1 = nodeTableJournal.allocOffset() ;
NodeId x2 = mapFromJournal(x1) ;
return x2 ;
}
@Override
public void begin(Transaction txn)
{
//debug("%s begin", txn.getLabel()) ;
if ( this.txn.getTxnId() != txn.getTxnId() )
throw new TDBException(String.format("Different transactions: %s %s", this.txn.getLabel(), txn.getLabel())) ;
if ( passthrough )
throw new TDBException("Already active") ;
passthrough = false ;
allocOffset = base.allocOffset().getId() ;
// base node table empty e.g. first use.
journalObjFileStartOffset = journalObjFile.length() ;
// Because the data is written in prepare, the journal of object data is
// always empty at the start of a transaction.
if ( journalObjFileStartOffset != 0 )
warn(log, "%s journalStartOffset not zero: %d/0x%02X",txn.getLabel(), journalObjFileStartOffset, journalObjFileStartOffset) ;
allocOffset += journalObjFileStartOffset ;
this.nodeTableJournal = new NodeTableNative(nodeIndex, journalObjFile) ;
this.nodeTableJournal = NodeTableCache.create(nodeTableJournal, CacheSize, CacheSize, 100) ;
// This class knows about non-mappable inline values. mapToJournal(NodeId)/mapFromJournal.
this.nodeTableJournal = NodeTableInline.create(nodeTableJournal) ;
}
static public boolean APPEND_LOG = false ;
/** Copy from the journal file to the real file */
/*package*/ void append()
{
Iterator<Pair<NodeId, Node>> iter = nodeTableJournal.all() ;
Pair<NodeId, Node> firstPair = null ;
Pair<NodeId, Node> lastPair = null ;
for ( ; iter.hasNext() ; )
{
Pair<NodeId, Node> x = iter.next() ;
if ( firstPair == null )
firstPair = x ;
lastPair = x ;
NodeId nodeId = x.getLeft() ;
Node node = x.getRight() ;
debug(" append: %s -> %s", x, mapFromJournal(nodeId)) ;
// This does the write.
NodeId nodeId2 = base.getAllocateNodeId(node) ;
if ( ! nodeId2.equals(mapFromJournal(nodeId)) )
inconsistent(node, nodeId, nodeId2) ;
}
}
private void inconsistent(Node node , NodeId nodeId , NodeId nodeId2 )
{
String msg = String.format("Different ids for %s: allocated: expected %s, got %s", node, mapFromJournal(nodeId), nodeId2) ;
System.err.println() ;
System.err.println() ;
System.err.println(msg) ;
dump() ;
System.err.println() ;
throw new TDBException(msg) ;
}
// Debugging only
private void dump()
{
System.err.println(">>>>>>>>>>") ;
System.err.println("label = "+label) ;
System.err.println("txn = "+txn) ;
System.err.println("offset = "+allocOffset) ;
System.err.println("journalStartOffset = "+journalObjFileStartOffset) ;
System.err.println("journal = "+journalObjFile.getLabel()) ;
if ( true )
return ;
System.err.println("nodeTableJournal >>>") ;
Iterator<Pair<NodeId, Node>> iter = nodeTableJournal.all() ;
for ( ; iter.hasNext() ; )
{
Pair<NodeId, Node> x = iter.next() ;
NodeId nodeId = x.getLeft() ;
Node node = x.getRight() ;
NodeId mapped = mapFromJournal(nodeId) ;
//debug("append: %s -> %s", x, mapFromJournal(nodeId)) ;
// This does the write.
NodeId nodeId2 = base.getAllocateNodeId(node) ;
System.err.println(x + " mapped=" + mapped + " getAlloc="+nodeId2) ;
}
System.err.println("journal >>>") ;
Iterator<Pair<Long, ByteBuffer>> iter1 = this.journalObjFile.all() ;
for ( ; iter1.hasNext() ; )
{
Pair<Long, ByteBuffer> p = iter1.next() ;
System.err.println(p.getLeft()+" : "+p.getRight()) ;
ByteBufferLib.print(System.err, p.getRight()) ;
}
System.err.println("nodeIndex >>>") ;
Iterator<Record> iter2 = this.nodeIndex.iterator() ;
for ( ; iter2.hasNext() ; )
{
Record r = iter2.next() ;
System.err.println(r) ;
}
System.err.println("<<<<<<<<<<") ;
}
@Override
public void commitPrepare(Transaction txn)
{
debug("commitPrepare") ;
// The node table is append-only so it can be written during prepare.
// The index isn't written (via the transaction journal) until enact.
if ( nodeTableJournal == null )
throw new TDBTransactionException(txn.getLabel()+": Not in a transaction for a commit to happen") ;
writeNodeJournal() ;
if ( journalObjFile != null && journalObjFile.length() != 0 )
{
long x = journalObjFile.length() ;
throw new TDBTransactionException(txn.getLabel()+": journalObjFile not cleared ("+x+")") ;
}
}
@Override
public void commitEnact(Transaction txn)
{
debug("commitEnact") ;
// The work was done in commitPrepare, using the fact that node data file
// is append only. Until here, pointers to the extra data aren't available
// until the index is written.
// The index is written via the transaction journal.
//writeJournal() ;
}
private void writeNodeJournal()
{
long expected = base.allocOffset().getId() ;
long len = journalObjFile.length() ;
if ( expected != allocOffset )
warn(log, "Inconsistency: base.allocOffset() = "+expected+" : allocOffset = "+allocOffset) ;
long newbase = -1 ;
append() ; // Calls all() which does a buffer flish.
// Reset (in case we use this again)
nodeIndex.clear() ;
journalObjFile.truncate(journalObjFileStartOffset) ; // Side effect is a buffer flush.
//journalObjFile.sync() ;
journalObjFile.close() ; // Side effect is a buffer flush.
journalObjFile = null ;
base.sync() ;
allocOffset = -99 ; // base.allocOffset().getId() ; // Will be invalid as we may write through to the base table later.
passthrough = true ;
}
@Override
public void commitClearup(Transaction txn)
{
debug("commitClearup") ;
finish() ;
}
@Override
public void abort(Transaction txn)
{
debug("abort") ;
if ( nodeTableJournal == null )
throw new TDBTransactionException(txn.getLabel()+": Not in a transaction for a commit to happen") ;
// Ensure the cache does not flush.
nodeTableJournal = null ;
// then make sure the journal file is empty.
if ( journalObjFile != null )
{
journalObjFile.truncate(journalObjFileStartOffset) ;
journalObjFile.sync() ;
}
finish() ;
}
private void finish()
{
close() ;
passthrough = true ;
nodeTableJournal = null ;
journalObjFile = null ;
}
@Override
public Iterator<Pair<NodeId, Node>> all()
{
// Better would be to convert the spill file format.
return Iter.concat(base.all(), nodeTableJournal.all()) ;
}
@Override
public boolean isEmpty()
{
return nodeTableJournal.isEmpty() && base.isEmpty() ;
}
@Override
public void sync()
{
if ( passthrough )
base.sync() ;
}
@Override
public void close()
{
if ( nodeIndex != null )
nodeIndex.close() ;
nodeIndex = null ;
// Closing the journal flushes it; i.e. disk IO.
if ( journalObjFile != null )
journalObjFile.close() ;
journalObjFile = null ;
}
@Override
public String toString() { return "NodeTableTrans:"+label+"(#"+Integer.toHexString(super.hashCode())+")" ; }
private void debug(String fmt, Object... args)
{
if ( log.isDebugEnabled() )
{
String x = String.format(fmt, args) ;
log.debug(label+": "+x) ;
}
}
}