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AccessCheckingReadPageCursor.java
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AccessCheckingReadPageCursor.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 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.checking;
import java.io.IOException;
import org.neo4j.io.pagecache.PageCursor;
import org.neo4j.io.pagecache.impl.DelegatingPageCursor;
public class AccessCheckingReadPageCursor extends DelegatingPageCursor
{
private boolean hasReadWithoutShouldRetry;
public AccessCheckingReadPageCursor( PageCursor delegate )
{
super( delegate );
}
@Override
public byte getByte()
{
markAsRead();
return super.getByte();
}
@Override
public void getBytes( byte[] data )
{
markAsRead();
super.getBytes( data );
}
@Override
public short getShort()
{
markAsRead();
return super.getShort();
}
@Override
public short getShort( int offset )
{
markAsRead();
return super.getShort( offset );
}
@Override
public long getLong()
{
markAsRead();
return super.getLong();
}
@Override
public long getLong( int offset )
{
markAsRead();
return super.getLong( offset );
}
@Override
public void getBytes( byte[] data, int arrayOffset, int length )
{
markAsRead();
super.getBytes( data, arrayOffset, length );
}
@Override
public int getInt( int offset )
{
markAsRead();
return super.getInt( offset );
}
@Override
public byte getByte( int offset )
{
markAsRead();
return super.getByte( offset );
}
@Override
public int getInt()
{
markAsRead();
return super.getInt();
}
private void markAsRead()
{
hasReadWithoutShouldRetry = true;
}
@Override
public boolean shouldRetry() throws IOException
{
hasReadWithoutShouldRetry = false;
return super.shouldRetry();
}
@Override
public boolean next() throws IOException
{
assertNoReadWithoutShouldRetry();
return super.next();
}
@Override
public void close()
{
assertNoReadWithoutShouldRetry();
super.close();
}
@Override
public boolean next( long pageId ) throws IOException
{
assertNoReadWithoutShouldRetry();
return super.next( pageId );
}
private void assertNoReadWithoutShouldRetry()
{
if ( hasReadWithoutShouldRetry )
{
throw new AssertionError( "Performed read from a read cursor without shouldRetry" );
}
}
}