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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.util.collection;

import org.eclipse.collections.api.map.primitive.MutableLongObjectMap;

import java.util.Iterator;

import org.neo4j.collection.trackable.HeapTrackingArrayList;
import org.neo4j.collection.trackable.HeapTrackingCollections;
import org.neo4j.internal.kernel.api.DefaultCloseListenable;
import org.neo4j.memory.Measurable;
import org.neo4j.memory.MemoryTracker;
import org.neo4j.memory.ScopedMemoryTracker;

import static java.util.Collections.emptyIterator;
import static org.neo4j.collection.trackable.HeapTrackingCollections.newLongObjectMap;
import static org.neo4j.memory.HeapEstimator.SCOPED_MEMORY_TRACKER_SHALLOW_SIZE;
import static org.neo4j.memory.HeapEstimator.shallowSizeOfInstance;

public class LongProbeTable extends DefaultCloseListenable
{
    private static final long SHALLOW_SIZE = shallowSizeOfInstance( LongProbeTable.class );

    private final MemoryTracker scopedMemoryTracker;
    private MutableLongObjectMap> map;

    public static  LongProbeTable createLongProbeTable( MemoryTracker memoryTracker )
    {
        MemoryTracker scopedMemoryTracker = memoryTracker.getScopedMemoryTracker();
        scopedMemoryTracker.allocateHeap( SHALLOW_SIZE + SCOPED_MEMORY_TRACKER_SHALLOW_SIZE );
        return new LongProbeTable<>( scopedMemoryTracker );
    }

    private LongProbeTable( MemoryTracker scopedMemoryTracker )
    {
        this.scopedMemoryTracker = scopedMemoryTracker;
        this.map = newLongObjectMap( scopedMemoryTracker );
    }

    public void put( long key, V value )
    {
        map.getIfAbsentPutWith( key, HeapTrackingCollections::newArrayList, scopedMemoryTracker ).add( value );
        scopedMemoryTracker.allocateHeap( value.estimatedHeapUsage() );
    }

    public Iterator get( long key )
    {
        var entry = map.get( key );
        if ( entry == null )
        {
            return emptyIterator();
        }
        return entry.iterator();
    }

    public boolean isEmpty()
    {
        return map.isEmpty();
    }

    @Override
    public void closeInternal()
    {
        if ( map != null )
        {
            map = null;
            scopedMemoryTracker.close();
        }
    }

    @Override
    public boolean isClosed()
    {
        return map == null;
    }
}