Mercurial > hg > blitz_condensed
view src/com/go/trove/util/UsageSet.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
---|---|
date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
children |
line wrap: on
line source
/* ==================================================================== * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group * ==================================================================== * The Tea Software License, Version 1.1 * * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, * if any, must include the following acknowledgment: * "This product includes software developed by the * Walt Disney Internet Group (http://opensource.go.com/)." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must * not be used to endorse or promote products derived from this * software without prior written permission. For written * permission, please contact opensource@dig.com. * * 5. Products derived from this software may not be called "Tea", * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior * written permission of the Walt Disney Internet Group. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * For more information about Tea, please see http://opensource.go.com/. */ package com.go.trove.util; import java.util.*; /****************************************************************************** * A Set that orders its elements based on how recently they have been used. * Most recently used elements appear first in the Set. Elements are marked as * being used whenever they are added to the Set. To re-position an element, * re-add it. * * @author Brian S O'Neill * @version * <!--$$Revision:--> 16 <!-- $-->, <!--$$JustDate:--> 9/07/00 <!-- $--> */ public class UsageSet extends MapBackedSet { /** * Creates a UsageSet in forward order, MRU first. */ public UsageSet() { this(new HashMap()); } /** * @param backingMap map to use for storage */ public UsageSet(Map backingMap) { super(new UsageMap(backingMap)); } /** * With reverse order, elements are ordered least recently used first. The * ordering of the elements will be consistent with the order they were * added in. Switching to and from reverse order is performed quickly * and is not affected by the current size of the set. */ public void setReverseOrder(boolean reverse) { ((UsageMap)mMap).setReverseOrder(reverse); } /** * Returns the first element in the set, the most recently used. If reverse * order, then the least recently used is returned. */ public Object first() throws NoSuchElementException { return ((UsageMap)mMap).firstKey(); } /** * Returns the last element in the set, the least recently used. If reverse * order, then the most recently used is returned. */ public Object last() throws NoSuchElementException { return ((UsageMap)mMap).lastKey(); } }