Mercurial > hg > release > thermostat-0.6
view vm-cpu/agent/src/main/java/com/redhat/thermostat/vm/cpu/agent/internal/VmCpuBackend.java @ 989:cf7a445c359b
Refactoring and cleanup of Backend
Reviewed-by: omajid
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2013-February/005705.html
author | Jon VanAlten <jon.vanalten@redhat.com> |
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date | Fri, 15 Feb 2013 15:16:47 -0500 |
parents | e765c145d124 |
children |
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/* * Copyright 2012, 2013 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.cpu.agent.internal; import java.io.BufferedReader; import java.io.IOException; import java.util.List; import java.util.concurrent.CopyOnWriteArrayList; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; import java.util.logging.Level; import java.util.logging.Logger; import com.redhat.thermostat.agent.VmStatusListener; import com.redhat.thermostat.agent.VmStatusListenerRegistrar; import com.redhat.thermostat.backend.BaseBackend; import com.redhat.thermostat.common.Clock; import com.redhat.thermostat.common.SystemClock; import com.redhat.thermostat.common.Version; import com.redhat.thermostat.common.utils.LoggingUtils; import com.redhat.thermostat.utils.ProcDataSource; import com.redhat.thermostat.utils.SysConf; import com.redhat.thermostat.vm.cpu.common.VmCpuStatDAO; import com.redhat.thermostat.vm.cpu.common.model.VmCpuStat; public class VmCpuBackend extends BaseBackend implements VmStatusListener { private static final Logger LOGGER = LoggingUtils.getLogger(VmCpuBackend.class); static final long PROC_CHECK_INTERVAL = 1000; // TODO make this configurable. private VmCpuStatBuilder vmCpuStatBuilder; private VmCpuStatDAO vmCpuStats; private ScheduledExecutorService executor; private VmStatusListenerRegistrar registrar; private boolean started; private final List<Integer> pidsToMonitor = new CopyOnWriteArrayList<>(); public VmCpuBackend(ScheduledExecutorService executor, VmCpuStatDAO vmCpuStatDao, Version version, VmStatusListenerRegistrar registrar) { super("VM CPU Backend", "Gathers CPU statistics about a JVM", "Red Hat, Inc.", version.getVersionNumber(), true); this.executor = executor; this.vmCpuStats = vmCpuStatDao; this.registrar = registrar; Clock clock = new SystemClock(); long ticksPerSecond = SysConf.getClockTicksPerSecond(); ProcDataSource source = new ProcDataSource(); ProcessStatusInfoBuilder builder = new ProcessStatusInfoBuilder(new ProcDataSource()); int numCpus = getCpuCount(source); vmCpuStatBuilder = new VmCpuStatBuilder(clock, numCpus, ticksPerSecond, builder); } @Override public boolean activate() { if (!started) { registrar.register(this); executor.scheduleAtFixedRate(new Runnable() { @Override public void run() { for (Integer pid : pidsToMonitor) { if (vmCpuStatBuilder.knowsAbout(pid)) { VmCpuStat dataBuilt = vmCpuStatBuilder.build(pid); if (dataBuilt != null) { vmCpuStats.putVmCpuStat(dataBuilt); } } else { vmCpuStatBuilder.learnAbout(pid); } } } }, 0, PROC_CHECK_INTERVAL, TimeUnit.MILLISECONDS); started = true; } return started; } @Override public boolean deactivate() { if (started) { executor.shutdown(); registrar.unregister(this); started = false; } return !started; } @Override public boolean isActive() { return started; } @Override public int getOrderValue() { return ORDER_CPU_GROUP + 50; } private int getCpuCount(ProcDataSource dataSource) { final String KEY_PROCESSOR_ID = "processor"; int cpuCount = 0; try (BufferedReader bufferedReader = new BufferedReader(dataSource.getCpuInfoReader())) { String line = null; while ((line = bufferedReader.readLine()) != null) { if (line.startsWith(KEY_PROCESSOR_ID)) { cpuCount++; } } } catch (IOException ioe) { LOGGER.log(Level.WARNING, "Unable to read cpu info"); } return cpuCount; } /* * Methods implementing VmStatusListener */ @Override public void vmStatusChanged(Status newStatus, int pid) { switch (newStatus) { case VM_STARTED: /* fall-through */ case VM_ACTIVE: pidsToMonitor.add(pid); break; case VM_STOPPED: // the cast is important because it changes the call from remove(index) to remove(Object) pidsToMonitor.remove((Integer) pid); vmCpuStatBuilder.forgetAbout(pid); break; } } /* * For testing purposes only. */ void setVmCpuStatBuilder(VmCpuStatBuilder vmCpuStatBuilder) { this.vmCpuStatBuilder = vmCpuStatBuilder; } }