NodeCountsStage.java

/*
 * Copyright (c) 2002-2018 "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.unsafe.impl.batchimport;

import org.neo4j.kernel.impl.api.CountsAccessor;
import org.neo4j.kernel.impl.store.NodeStore;
import org.neo4j.kernel.impl.util.monitoring.ProgressReporter;
import org.neo4j.unsafe.impl.batchimport.cache.NodeLabelsCache;
import org.neo4j.unsafe.impl.batchimport.staging.BatchFeedStep;
import org.neo4j.unsafe.impl.batchimport.staging.ReadRecordsStep;
import org.neo4j.unsafe.impl.batchimport.staging.Stage;
import org.neo4j.unsafe.impl.batchimport.stats.StatsProvider;

import static org.neo4j.unsafe.impl.batchimport.RecordIdIterator.allIn;
import static org.neo4j.unsafe.impl.batchimport.staging.Step.RECYCLE_BATCHES;

/**
 * Reads all records from {@link NodeStore} and process the counts in them, populating {@link NodeLabelsCache}
 * for later use of {@link RelationshipCountsStage}.
 */
public class NodeCountsStage extends Stage
{
    public static final String NAME = "Node counts";

    public NodeCountsStage( Configuration config, NodeLabelsCache cache, NodeStore nodeStore, int highLabelId,
            CountsAccessor.Updater countsUpdater, ProgressReporter progressReporter,
            StatsProvider... additionalStatsProviders )
    {
        super( NAME, null, config, RECYCLE_BATCHES );
        add( new BatchFeedStep( control(), config, allIn( nodeStore, config ), nodeStore.getRecordSize() ) );
        add( new ReadRecordsStep<>( control(), config, false, nodeStore ) );
        add( new RecordProcessorStep<>( control(), "COUNT", config,
                new NodeCountsProcessor( nodeStore, cache, highLabelId, countsUpdater, progressReporter ), true,
                additionalStatsProviders ) );
    }
}