Mercurial > hg > release > thermostat-1.2
view vm-memory/agent/src/main/java/com/redhat/thermostat/vm/memory/agent/internal/VmMemoryDataExtractor.java @ 1660:c6ae78b6f3ac
[Thermostat 1.2] Update copyright year to 2015
Reviewed-by: omajid
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2015-March/013127.html
PR2273
author | Severin Gehwolf <sgehwolf@redhat.com> |
---|---|
date | Wed, 11 Mar 2015 15:07:27 +0100 |
parents | aff2d3046af0 |
children |
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/* * Copyright 2012-2015 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat 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. * * Thermostat 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 Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code 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 code. If you modify * this code, 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 com.redhat.thermostat.vm.memory.agent.internal; import com.redhat.thermostat.backend.VmUpdate; import com.redhat.thermostat.backend.VmUpdateException; import com.redhat.thermostat.vm.memory.common.model.VmMemoryStat.Generation; /** * A helper class to provide type-safe access to commonly used jvmstat monitors * <p> * Implementation details: For local vms, jvmstat uses a ByteBuffer * corresponding to mmap()ed hsperfdata file. The hsperfdata file is updated * asynchronously by the vm that created the file. The polling that jvmstat api * provides is merely an abstraction over this (possibly always up-to-date) * ByteBuffer. So the data this class extracts is as current as possible, and * does not correspond to when the jvmstat update events fired. */ public class VmMemoryDataExtractor { /* * Note, there may be a performance issue to consider here. We have a lot of * string constants. When we start adding some of the more heavyweight * features, and running into CPU issues this may need to be reconsidered in * order to avoid the String pool overhead. See also: * http://docs.oracle.com/javase/6/docs/api/java/lang/String.html#intern() */ private final VmUpdate update; public VmMemoryDataExtractor(VmUpdate update) { this.update = update; } public Long getTotalGcGenerations() throws VmUpdateException { return update.getPerformanceCounterLong("sun.gc.policy.generations"); } public String getGenerationName(long generation) throws VmUpdateException { return update.getPerformanceCounterString("sun.gc.generation." + generation + ".name"); } public Long getGenerationCapacity(long generation) throws VmUpdateException { return update.getPerformanceCounterLong("sun.gc.generation." + generation + ".capacity"); } public Long getGenerationMaxCapacity(long generation) throws VmUpdateException { return update.getPerformanceCounterLong("sun.gc.generation." + generation + ".maxCapacity"); } public String getGenerationCollector(long generation) throws VmUpdateException { // this is just re-implementing getCollectorName() // TODO check generation number and collector number are always associated String collector = update.getPerformanceCounterString("sun.gc.collector." + generation + ".name"); if (collector == null) { collector = Generation.COLLECTOR_NONE; } return collector; } public Long getTotalSpaces(long generation) throws VmUpdateException { return update.getPerformanceCounterLong("sun.gc.generation." + generation + ".spaces"); } public String getSpaceName(long generation, long space) throws VmUpdateException { return update.getPerformanceCounterString("sun.gc.generation." + generation + ".space." + space + ".name"); } public Long getSpaceCapacity(long generation, long space) throws VmUpdateException { return update.getPerformanceCounterLong("sun.gc.generation." + generation + ".space." + space + ".capacity"); } public Long getSpaceMaxCapacity(long generation, long space) throws VmUpdateException { return update.getPerformanceCounterLong("sun.gc.generation." + generation + ".space." + space + ".maxCapacity"); } public Long getSpaceUsed(long generation, long space) throws VmUpdateException { return update.getPerformanceCounterLong("sun.gc.generation." + generation + ".space." + space + ".used"); } }