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PageManager.java
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PageManager.java
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/*
* Copyright (c) 2002-2017 "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.internal.store.cursors;
public abstract class PageManager extends MemoryManager
{
protected abstract void releasePage( long pageId, long base, int offset, long lockToken );
protected abstract void assertValidOffset( long pageId, long base, int offset, int bound );
protected abstract long sharedLock( long pageId, long base, int offset );
protected abstract long exclusiveLock( long pageId, long base, int offset );
protected abstract void releaseLock( long pageId, long base, int offset, long lockToken );
protected abstract long refreshLockToken( long pageId, long base, int offset, long lockToken );
protected long moveLock( long pageId, long base, int offset, long lockToken, int newOffset )
{
boolean exclusive = lockIsExclusive(lockToken);
releaseLock( pageId, base, offset, lockToken );
return exclusive ? exclusiveLock( pageId, base, newOffset ) : sharedLock( pageId, base, offset );
}
protected boolean lockIsExclusive( long lockToken )
{
return true;
}
protected abstract boolean initializeCursor(
long virtualAddress,
ReadCursor cursor );
protected abstract boolean moveToVirtualAddress(
long virtualAddress,
ReadCursor cursor,
long pageId,
long base,
int offset, long lockToken );
}