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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) 2002-2015 "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 .
 */
package org.neo4j.kernel.impl.store;

import org.neo4j.kernel.impl.api.CountsAccessor;
import org.neo4j.kernel.impl.store.counts.CountsTracker;
import org.neo4j.kernel.impl.store.kvstore.DataInitializer;
import org.neo4j.unsafe.impl.batchimport.Configuration;
import org.neo4j.unsafe.impl.batchimport.NodeCountsStage;
import org.neo4j.unsafe.impl.batchimport.RelationshipCountsStage;
import org.neo4j.unsafe.impl.batchimport.cache.NodeLabelsCache;
import org.neo4j.unsafe.impl.batchimport.cache.NumberArrayFactory;

import static org.neo4j.unsafe.impl.batchimport.cache.NumberArrayFactory.AUTO;
import static org.neo4j.unsafe.impl.batchimport.staging.ExecutionSupervisors.superviseDynamicExecution;

public class CountsComputer implements DataInitializer
{
    public static void recomputeCounts( NeoStores stores )
    {
        MetaDataStore metaDataStore = stores.getMetaDataStore();
        CountsTracker counts = stores.getCounts();
        try ( CountsAccessor.Updater updater = counts.reset( metaDataStore.getLastCommittedTransactionId() ) )
        {
            new CountsComputer( stores ).initialize( updater );
        }
    }

    private final NodeStore nodes;
    private final RelationshipStore relationships;
    private final int highLabelId;
    private final int highRelationshipTypeId;
    private final long lastCommittedTransactionId;

    public CountsComputer( NeoStores stores )
    {
        this( stores.getMetaDataStore().getLastCommittedTransactionId(),
              stores.getNodeStore(), stores.getRelationshipStore(),
              (int) stores.getLabelTokenStore().getHighId(),
              (int) stores.getRelationshipTypeTokenStore().getHighId() );
    }

    public CountsComputer( long lastCommittedTransactionId, NodeStore nodes, RelationshipStore relationships,
            int highLabelId,
            int highRelationshipTypeId )
    {
        this.lastCommittedTransactionId = lastCommittedTransactionId;
        this.nodes = nodes;
        this.relationships = relationships;
        this.highLabelId = highLabelId;
        this.highRelationshipTypeId = highRelationshipTypeId;
    }

    @Override
    public void initialize( CountsAccessor.Updater countsUpdater )
    {
        NodeLabelsCache cache = new NodeLabelsCache( NumberArrayFactory.AUTO, highLabelId );
        try
        {
            // Count nodes
            superviseDynamicExecution(
                    new NodeCountsStage( Configuration.DEFAULT, cache, nodes, highLabelId, countsUpdater ) );
            // Count relationships
            superviseDynamicExecution(
                    new RelationshipCountsStage( Configuration.DEFAULT, cache, relationships, highLabelId,
                            highRelationshipTypeId, countsUpdater, AUTO ) );
        }
        finally
        {
            cache.close();
        }
    }

    @Override
    public long initialVersion()
    {
        return lastCommittedTransactionId;
    }
}