Mercurial > hg > thermostat-ng > agent
view agent/core/src/main/java/com/redhat/thermostat/backend/HostPollingBackend.java @ 2772:9e3d6eedbbee
Add jvm-cpu plugin
Reviewed-by: jmatsuok, stooke
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2017-August/024663.html
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2017-September/025090.html
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2017-October/025307.html
author | Christopher Koehler <chkoehle@redhat.com> |
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date | Tue, 10 Oct 2017 12:29:18 -0400 |
parents | 48e1cf54c238 |
children |
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/* * Copyright 2012-2017 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.backend; import java.util.HashMap; import java.util.Map; import java.util.Set; import java.util.concurrent.CopyOnWriteArraySet; import java.util.concurrent.ScheduledExecutorService; import java.util.logging.Logger; import com.redhat.thermostat.common.NotImplementedException; import com.redhat.thermostat.common.Version; import com.redhat.thermostat.common.utils.LoggingUtils; /** * Convenience {@link Backend} class for implementations that will take some * action at the Host or system level on a regular interval. Simply * extend this class, implement any missing methods, and register one or * more {@link HostPollingAction} implementations during instantiation. */ public abstract class HostPollingBackend extends PollingBackend { private static final Logger logger = LoggingUtils.getLogger(HostPollingBackend.class); private static final int EXCEPTIONS_THRESHOLD = 10; private final Set<HostPollingAction> actions; private final Map<String, Integer> badActions; public HostPollingBackend(String name, String description, String vendor, Version version, ScheduledExecutorService executor) { super(name, description, vendor, version.getVersionNumber(), executor); actions = new CopyOnWriteArraySet<>(); badActions = new HashMap<>(); } final public void doScheduledActions() { for (HostPollingAction action : actions) { try { action.run(); } catch (Throwable t) { handleActionException(action); } } } private synchronized void handleActionException(HostPollingAction action) { final String actionName = action.getClass().getName(); Integer count = badActions.remove(actionName); if (count == null) { count = Integer.valueOf(1); // Already called once when this happens } if (count < EXCEPTIONS_THRESHOLD) { logger.info(HostPollingAction.class.getSimpleName() + " " + actionName + " threw an exception."); count++; badActions.put(actionName, count); } else { logger.fine("Removing " + actionName + " due to too many repeated exceptions."); unregisterAction(action); } } /** * Register an action to be performed at each polling interval. It is * recommended that implementations register all such actions during * instantiation. */ protected final void registerAction(HostPollingAction action) { actions.add(action); } /** * Unregister an action so that it will no longer be performed at each * polling interval. If no such action has been registered, this * method has no effect. Depending on thread timing issues, the action * may be performed once even after this method has been called. */ protected final void unregisterAction(HostPollingAction action) { actions.remove(action); } @Override public void setObserveNewJvm(boolean newValue) { throw new NotImplementedException("This backend does not observe jvms!"); } // Intentionally final do-nothing. final public void preActivate() {}; final public void postDeactivate() {}; }