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Diffstat (limited to 'jetty-util/src/main/java/org/eclipse/jetty/util/MemoryUtils.java')
-rw-r--r-- | jetty-util/src/main/java/org/eclipse/jetty/util/MemoryUtils.java | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/jetty-util/src/main/java/org/eclipse/jetty/util/MemoryUtils.java b/jetty-util/src/main/java/org/eclipse/jetty/util/MemoryUtils.java new file mode 100644 index 0000000000..62d7039f73 --- /dev/null +++ b/jetty-util/src/main/java/org/eclipse/jetty/util/MemoryUtils.java @@ -0,0 +1,71 @@ +// +// ======================================================================== +// Copyright (c) 1995-2013 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; + +/** + * {@link MemoryUtils} provides an abstraction over memory properties and operations. + * <p /> + */ +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; + } + +} |