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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.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 .
 */
package org.neo4j.kernel.impl.pagecache;

import org.neo4j.configuration.Config;
import org.neo4j.configuration.GraphDatabaseSettings;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.io.pagecache.tracing.PageCacheTracer;
import org.neo4j.logging.Level;
import org.neo4j.logging.log4j.Log4jLogProvider;
import org.neo4j.logging.log4j.LogConfig;
import org.neo4j.logging.log4j.Neo4jLoggerContext;
import org.neo4j.memory.MemoryPools;
import org.neo4j.scheduler.JobScheduler;
import org.neo4j.time.Clocks;

import static org.neo4j.configuration.GraphDatabaseSettings.memory_tracking;

/*
 * This class is an helper to allow to construct properly a page cache in the few places we need it without all
 * the graph database stuff, e.g., various store dump programs.
 *
 * All other places where a "proper" page cache is available, e.g. in store migration, should have that one injected.
 * And tests should use the ConfigurablePageCacheRule.
 */
public final class ConfigurableStandalonePageCacheFactory
{
    private ConfigurableStandalonePageCacheFactory()
    {
    }

    public static PageCache createPageCache( FileSystemAbstraction fileSystem, JobScheduler jobScheduler, PageCacheTracer pageCacheTracer )
    {
        var config = Config.defaults();
        return createPageCache( fileSystem, pageCacheTracer, config, jobScheduler, new MemoryPools( config.get( memory_tracking ) ) );
    }

    public static PageCache createPageCache( FileSystemAbstraction fileSystem, Config config, JobScheduler jobScheduler, PageCacheTracer pageCacheTracer )
    {
        return createPageCache( fileSystem, pageCacheTracer, config, jobScheduler, new MemoryPools( config.get( memory_tracking ) ) );
    }

    /**
     * Create page cache
     * @param fileSystem file system that page cache will be based on
     * @param pageCacheTracer global page cache tracer
     * @param config page cache configuration
     * @param jobScheduler page cache job scheduler
     * @return created page cache instance
     */
    public static PageCache createPageCache( FileSystemAbstraction fileSystem, PageCacheTracer pageCacheTracer, Config config,
            JobScheduler jobScheduler, MemoryPools memoryPools )
    {
        config.setIfNotSet( GraphDatabaseSettings.pagecache_memory, "8M" );
        Neo4jLoggerContext loggerContext =
                LogConfig.createBuilder( System.err, Level.INFO )
                        .withTimezone( config.get( GraphDatabaseSettings.db_timezone ) )
                        .build();

        try ( Log4jLogProvider logProvider = new Log4jLogProvider( loggerContext ) )
        {
            ConfiguringPageCacheFactory pageCacheFactory = new ConfiguringPageCacheFactory(
                    fileSystem, config, pageCacheTracer, logProvider.getLog( PageCache.class ), jobScheduler,
                    Clocks.nanoClock(), memoryPools );
            return pageCacheFactory.getOrCreatePageCache();
        }
    }
}