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//
// ========================================================================
// Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* MemoryUtils provides an abstraction over memory properties and operations.
*/
public class MemoryUtils
{
private static final int cacheLineBytes;
static
{
final int defaultValue = 64;
int value = defaultValue;
try
{
value = Integer.parseInt(AccessController.doPrivileged(new PrivilegedAction<String>()
{
@Override
public String run()
{
return System.getProperty("org.eclipse.jetty.util.cacheLineBytes", String.valueOf(defaultValue));
}
}));
}
catch (Exception ignored)
{
}
cacheLineBytes = value;
}
private MemoryUtils()
{
}
public static int getCacheLineBytes()
{
return cacheLineBytes;
}
public static int getIntegersPerCacheLine()
{
return getCacheLineBytes() >> 2;
}
public static int getLongsPerCacheLine()
{
return getCacheLineBytes() >> 3;
}
}
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