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FlushEventOpportunity.java
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FlushEventOpportunity.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;
import org.neo4j.io.pagecache.PageSwapper;
/**
* Represents the opportunity to flush a page.
*
* The flushing might not happen, though, because only dirty pages are flushed.
*/
public interface FlushEventOpportunity
{
/**
* A FlushEventOpportunity that only returns the FlushEvent.NULL.
*/
FlushEventOpportunity NULL = ( filePageId, cachePageId, swapper ) -> FlushEvent.NULL;
/**
* Begin flushing the given page.
*/
FlushEvent beginFlush( long filePageId, long cachePageId, PageSwapper swapper );
}