96 lines
3.4 KiB
Java
96 lines
3.4 KiB
Java
/* VMMemoryManagerMXBeanImpl.java - VM interface for a memory manager bean
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Copyright (C) 2006 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.lang.management;
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import java.lang.management.ManagementFactory;
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import java.lang.management.MemoryPoolMXBean;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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/**
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* Provides access to information about the memory managers
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* of the virtual machine. An instance of this bean for each
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* memory manager is obtained by calling
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* {@link ManagementFactory#getMemoryManagerMXBeans()}.
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*
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* @author Andrew John Hughes (gnu_andrew@member.fsf.org)
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* @since 1.5
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*/
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final class VMMemoryManagerMXBeanImpl
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{
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/**
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* Returns an array containing the names of the memory pools
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* this memory manager manages.
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*
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* @param name the name of the memory manager.
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* @return an array containing the name of each memory pool
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* this manager is responsible for.
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*/
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static String[] getMemoryPoolNames(String name)
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{
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List managedPools = new ArrayList();
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Iterator beans = ManagementFactory.getMemoryPoolMXBeans().iterator();
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while (beans.hasNext())
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{
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MemoryPoolMXBean bean = (MemoryPoolMXBean) beans.next();
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String[] managers = bean.getMemoryManagerNames();
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for (int a = 0; a < managers.length; ++a)
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if (managers[a].equals(name))
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{
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managedPools.add(bean.getName());
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break;
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}
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}
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return (String[]) managedPools.toArray(new String[managedPools.size()]);
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}
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/**
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* Returns true if this memory manager is still valid. A memory
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* manager becomes invalid when it is removed by the virtual machine
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* and no longer used.
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*
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* @param name the name of the memory manager.
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* @return true if this memory manager is valid.
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*/
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static native boolean isValid(String name);
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}
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