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MuninnWritePageCursor.java
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MuninnWritePageCursor.java
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/*
* Copyright (c) 2002-2016 "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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.io.pagecache.impl.muninn;
import java.io.IOException;
import org.neo4j.io.pagecache.PageSwapper;
import org.neo4j.io.pagecache.PagedFile;
final class MuninnWritePageCursor extends MuninnPageCursor
{
@Override
protected void unpinCurrentPage()
{
if ( page != null )
{
pinEvent.done();
unlockPage( page );
}
clearPageState();
}
@Override
public boolean next() throws IOException
{
unpinCurrentPage();
long lastPageId = assertPagedFileStillMappedAndGetIdOfLastPage();
if ( nextPageId > lastPageId )
{
if ( (pf_flags & PagedFile.PF_NO_GROW) != 0 )
{
return false;
}
else
{
pagedFile.increaseLastPageIdTo( nextPageId );
}
}
pin( nextPageId, true );
currentPageId = nextPageId;
nextPageId++;
return true;
}
@Override
protected void lockPage( MuninnPage page )
{
page.writeLock();
}
@Override
protected void unlockPage( MuninnPage page )
{
page.unlockWrite();
}
@Override
protected void pinCursorToPage( MuninnPage page, long filePageId, PageSwapper swapper )
{
reset( page );
// Check if we've been racing with unmapping. We want to do this before
// we make any changes to the contents of the page, because once all
// files have been unmapped, the page cache can be closed. And when
// that happens, dirty contents in memory will no longer have a chance
// to get flushed.
assertPagedFileStillMappedAndGetIdOfLastPage();
page.incrementUsage();
page.markAsDirty();
}
@Override
protected void convertPageFaultLock( MuninnPage page )
{
page.unlockExclusive(); // TODO page.unlockExclusiveAndTakeWriteLock
page.writeLock();
}
@Override
public final boolean shouldRetry()
{
// We take exclusive locks, so there's never a need to retry.
return false;
}
}