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PageFaultEvent.java
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PageFaultEvent.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.tracing;
/**
* Begin a page fault as part of a pin event.
*/
public interface PageFaultEvent extends EvictionEventOpportunity
{
/**
* A PageFaultEvent that does nothing.
*/
PageFaultEvent NULL = new PageFaultEvent()
{
@Override
public void addBytesRead( long bytes )
{
}
@Override
public void done()
{
}
@Override
public void done( Throwable throwable )
{
}
@Override
public EvictionEvent beginEviction()
{
return EvictionEvent.NULL;
}
@Override
public void setCachePageId( long cachePageId )
{
}
};
/**
* Add up a number of bytes that has been read from the backing file into the free page being bound.
*/
void addBytesRead( long bytes );
/**
* The id of the cache page that is being faulted into.
*/
void setCachePageId( long cachePageId );
/**
* The page fault completed successfully.
*/
void done();
/**
* The page fault did not complete successfully, but instead caused the given Throwable to be thrown.
*/
void done( Throwable throwable );
}