| /* VMGarbageCollectorMXBeanImpl.java - VM interface for a GC bean |
| Copyright (C) 2006 Free Software Foundation |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath 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 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.java.lang.management; |
| |
| /** |
| * Provides access to information about the garbage collectors |
| * of the virtual machine. Garbage collectors are responsible |
| * for removing unreferenced objects from memory. A garbage |
| * collector is a type of memory manager, so this interface |
| * is combined with that of generic memory managers. An instance |
| * of this bean for each garbage collector is obtained by calling |
| * {@link ManagementFactory#getGarbageCollectorMXBeans()}. |
| * |
| * @author Andrew John Hughes (gnu_andrew@member.fsf.org) |
| * @since 1.5 |
| */ |
| final class VMGarbageCollectorMXBeanImpl |
| { |
| |
| /** |
| * Returns the number of collections the garbage collector |
| * represented by this bean has made. -1 is returned if the |
| * collection count is undefined. |
| * |
| * @param name the name of the garbage collector. |
| * @return the number of collections made, or -1 if this is |
| * undefined. |
| */ |
| static native long getCollectionCount(String name); |
| |
| /** |
| * Returns the accumulated number of milliseconds this garbage |
| * collector has spent freeing the memory used by unreferenced |
| * objects. -1 is returned if the collection time is undefined. |
| * Note that the accumulated time may not change, even when the |
| * collection count increases, if the time taken is sufficiently |
| * short; this depends on the resolution of the timer used. |
| * |
| * @param name the name of the garbage collector. |
| * @return the accumulated number of milliseconds spent collecting, |
| * or -1 if this is undefined. |
| */ |
| static native long getCollectionTime(String name); |
| |
| } |