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TDB is a storage subsystem for Jena and ARQ, it is a native triple store providing persistent storage of triples/quads.
/*
* 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 org.apache.jena.tdb.base.block;
import static org.apache.jena.tdb.base.block.BlockMgrTracker.Action.* ;
import java.util.ArrayList ;
import java.util.Iterator ;
import java.util.List ;
import org.apache.jena.ext.com.google.common.collect.HashMultiset;
import org.apache.jena.ext.com.google.common.collect.Multiset;
import org.apache.jena.atlas.lib.Pair ;
import org.apache.jena.tdb.TDBException ;
import org.slf4j.Logger ;
import org.slf4j.LoggerFactory ;
public class BlockMgrTracker /*extends BlockMgrWrapper*/ implements BlockMgr
{
private static Logger loggerDefault = LoggerFactory.getLogger(BlockMgrTracker.class) ;
public static boolean verbose = false ;
static enum Action { Alloc, Promote, GetRead, GetWrite, Write, Release, Free, IterRead,
BeginRead, EndRead, BeginUpdate, EndUpdate, BeginIter, EndIter }
static final Long NoId = (long) -9;
// ---- State for tracking
// Track and count block references and releases
// No - the page is dirty.
protected final Multiset activeReadBlocks = HashMultiset.create() ;
protected final Multiset activeWriteBlocks = HashMultiset.create() ;
protected final Multiset activeIterBlocks = HashMultiset.create() ;
// Track the operations
protected final List> actions = new ArrayList<>() ;
protected final List> activeIterators = new ArrayList<>() ;
// ---- State for tracking
protected final BlockMgr blockMgr ;
private void clearInternalRW()
{
activeReadBlocks.clear() ;
activeWriteBlocks.clear() ;
actions.clear() ;
}
private int inRead = 0 ;
private int inIterator = 0 ;
private boolean inUpdate = false ;
private final Logger log ;
private final String label ;
public static BlockMgr track(BlockMgr blkMgr) { return track(blkMgr.getLabel(), blkMgr) ; }
private static BlockMgr track(String label, BlockMgr blkMgr)
{
return new BlockMgrTracker(label, blkMgr) ;
}
private BlockMgrTracker(String label, BlockMgr blockMgr)
{
this(loggerDefault, label, blockMgr) ;
}
//
// public BlockMgrTracker(Class cls, String label, BlockMgr blockMgr)
// {
// this(LoggerFactory.getLogger(cls), label, blockMgr) ;
// }
public BlockMgrTracker(Logger logger, String label, BlockMgr blockMgr)
{
this.blockMgr = blockMgr ;
this.log = logger ;
this.label = blockMgr.getLabel() ;
}
private void add(Action action, Long id) { actions.add(new Pair<>(action, id)) ; }
@Override
public Block allocate(int blockSize)
{
Block block ;
synchronized (this)
{
checkUpdate(Alloc) ;
block = blockMgr.allocate(blockSize) ;
Long id = block.getId() ;
activeWriteBlocks.add(id) ;
add(Alloc, id) ;
}
return block ;
}
@Override
public Block getRead(long id)
{
// What if this is a write block already?
synchronized (this)
{
checkRead(GetRead) ;
Long x = id;
add(GetRead, x) ;
if ( activeWriteBlocks.contains(x))
activeWriteBlocks.add(x) ;
else
activeReadBlocks.add(x) ;
}
return blockMgr.getRead(id) ;
}
@Override
public Block getReadIterator(long id)
{
synchronized (this)
{
checkReadOrIter(IterRead) ;
Long x = id;
add(IterRead, x) ;
activeIterBlocks.add(x) ;
}
return blockMgr.getReadIterator(id) ;
}
@Override
public Block getWrite(long id)
{
synchronized (this)
{
checkUpdate(GetWrite) ;
Long x = id;
add(GetWrite, x) ;
activeWriteBlocks.add(x) ;
}
return blockMgr.getWrite(id) ;
}
@Override
public Block promote(Block block)
{
synchronized (this)
{
checkUpdate(Promote) ;
Long id = block.getId() ;
add(Promote, id) ;
if ( ! activeWriteBlocks.contains(id) && ! activeReadBlocks.contains(id) )
error(Promote, id+" is not an active block") ;
if ( activeReadBlocks.contains(id) )
// Remove one read count
// Really, do this if obtained via "getRead" and not "getWrite"
activeReadBlocks.remove(id) ;
// Double promotion results in only one entry.
if ( ! activeWriteBlocks.contains(id) )
activeWriteBlocks.add(id) ;
}
return blockMgr.promote(block) ;
}
@Override
public void release(Block block)
{
synchronized (this)
{
checkReadOrIter(Release) ;
Long id = block.getId() ;
add(Release, id) ;
if ( ! activeReadBlocks.contains(id) && ! activeIterBlocks.contains(id) && ! activeWriteBlocks.contains(id) )
error(Release, id+" is not an active block") ;
// May have been promoted.
if ( activeWriteBlocks.contains(id) )
activeWriteBlocks.remove(id) ;
else
activeReadBlocks.remove(block.getId()) ;
activeIterBlocks.remove(block.getId()) ;
}
blockMgr.release(block) ;
}
@Override
public void write(Block block)
{
writeTracker(block) ;
blockMgr.write(block) ;
}
@Override
synchronized
public void overwrite(Block block)
{
writeTracker(block) ;
blockMgr.overwrite(block) ;
}
private void writeTracker(Block block)
{
synchronized (this)
{
checkUpdate(Write) ;
Long id = block.getId() ;
add(Write, id) ;
if ( ! activeWriteBlocks.contains(id) )
error(Write, id+ " is not an active write block") ;
}
}
@Override
public void free(Block block)
{
synchronized (this)
{
checkUpdate(Free) ;
Long id = block.getId() ;
add(Free, id) ;
if ( activeReadBlocks.contains(id) )
error(Free, id+" is a read block") ;
else if ( ! activeWriteBlocks.contains(id) )
error(Free, id+" is not a write block") ;
activeWriteBlocks.remove(id) ;
}
blockMgr.free(block) ;
}
@Override
public void sync()
{
blockMgr.sync() ;
}
@Override
public void syncForce()
{
blockMgr.syncForce() ;
}
@Override
public void close()
{ blockMgr.close() ; }
@Override
public boolean isEmpty()
{
return blockMgr.isEmpty() ;
}
@Override
public boolean valid(int id)
{
return blockMgr.valid(id) ;
}
@Override
public boolean isClosed()
{
return blockMgr.isClosed() ;
}
@Override
public void beginIterator(Iterator iter)
{
synchronized (this)
{
if ( activeIterators.contains(iter) )
error(BeginIter, "Iterator already active: "+iter) ;
activeIterators.add(iter) ;
}
blockMgr.beginIterator(iter) ;
}
@Override
public void endIterator(Iterator iter)
{
synchronized (this)
{
if ( ! activeIterators.contains(iter) )
error(EndIter, "Iterator not active: "+iter) ;
activeIterators.remove(iter) ;
if ( activeIterators.size() == 0 )
checkEmpty("Outstanding iterator read blocks", activeIterBlocks) ;
}
blockMgr.endIterator(iter) ;
}
@Override
synchronized
public void beginRead()
{
synchronized (this)
{
if ( inUpdate )
error(BeginRead, "beginRead when already in update") ;
inRead++ ;
inUpdate = false ;
}
blockMgr.beginRead() ;
}
@Override
synchronized
public void endRead()
{
synchronized (this)
{
if ( inRead == 0 )
error(EndRead, "endRead but not in read") ;
if ( inUpdate )
error(EndRead, "endRead when in update") ;
checkEmpty("Outstanding write blocks at end of read operations!",
activeWriteBlocks) ;
if ( inRead == 0 )
{
// Check at end of multiple reads or a write
checkEmpty("Outstanding read blocks at end of read operations",
activeReadBlocks) ;
clearInternalRW() ;
}
inUpdate = false ;
inRead-- ;
}
blockMgr.endRead() ;
}
@Override
public void beginUpdate()
{
synchronized (this)
{
if ( inRead > 0 )
error(BeginUpdate, "beginUpdate when already in read") ;
if ( inUpdate )
error(BeginUpdate, "beginUpdate when already in update") ;
inUpdate = true ;
}
blockMgr.beginUpdate() ;
}
@Override
public void endUpdate()
{
synchronized (this)
{
if ( ! inUpdate )
error(EndUpdate, "endUpdate but not in update") ;
if ( inRead > 0 )
error(EndUpdate, "endUpdate when in read") ;
checkEmpty("Outstanding read blocks at end of update operations",
activeReadBlocks) ;
checkEmpty("Outstanding write blocks at end of update operations",
activeWriteBlocks) ;
inUpdate = false ;
inRead = 0 ;
clearInternalRW() ;
}
blockMgr.endUpdate() ;
}
private void checkUpdate(Action action)
{
if ( ! inUpdate )
error(action,"called outside update") ;
}
private void checkRead(Action action)
{
if ( ! inUpdate && inRead == 0 )
error(action, "Called outside update and read") ;
}
private void checkReadOrIter(Action action)
{
if ( ! inUpdate && inRead == 0 && activeIterators.size() == 0 )
error(action, "Called outside update, read or an iterator") ;
}
private void checkEmpty(String string, Multiset blocks)
{
if ( ! blocks.isEmpty() )
{
error(string) ;
for ( Long id : blocks )
info(" Block: "+id) ;
history() ;
throw new TDBException() ;
//debugPoint() ;
}
}
private String msg(String string)
{
if ( label == null ) return string ;
return label+": "+string ;
}
private void info(String string)
{
log.info(msg(string)) ;
}
private void warn(String string)
{
log.warn(msg(string)) ;
}
private void error(String string)
{
log.error(msg(string)) ;
}
private void error(Action action, String string)
{
if ( verbose )
{
error(action+": "+string) ;
history() ;
}
throw new BlockException(msg(action+": "+string)) ;
//debugPoint() ;
}
private void history()
{
info("History") ;
for ( Pair p : actions )
{
if ( p.getRight() != NoId )
log.info(String.format("%s: %-12s %d", label, p.getLeft(), p.getRight())) ;
else
log.info(String.format("%s: %-12s", label, p.getLeft())) ;
}
}
@Override
public String toString() { return "BlockMgrTracker"+((label==null)?"":(": "+label)) ; }
@Override
public String getLabel()
{
return label ;
}
}