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GlobalMemoryTracker.java
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GlobalMemoryTracker.java
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/*
* 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.memory;
import java.util.concurrent.atomic.LongAdder;
/**
* Global memory tracker that can be used in a global multi threaded context to record
* allocation and de-allocation of native memory.
* @see org.neo4j.memory.MemoryAllocationTracker
* @see MemoryTracker
*/
public class GlobalMemoryTracker implements MemoryTracker, MemoryAllocationTracker
{
private LongAdder longAdder = new LongAdder();
public static final GlobalMemoryTracker INSTANCE = new GlobalMemoryTracker();
private GlobalMemoryTracker()
{
}
@Override
public long usedDirectMemory()
{
return longAdder.sum();
}
@Override
public void allocate( long allocatedBytes )
{
longAdder.add( allocatedBytes );
}
@Override
public void deallocate( long deAllocatedBytes )
{
longAdder.add( -deAllocatedBytes );
}
}