Mercurial > hg > thermostat-ng > agent
view agent/core/src/main/java/com/redhat/thermostat/agent/internal/AgentApplication.java @ 2776:6ea7021a74d6
Added framework for configurable Backend activation/deactivation
Reviewed-By: jkang, jerboaa
Review-Thread:
http://icedtea.classpath.org/pipermail/thermostat/2017-August/024612.html
http://icedtea.classpath.org/pipermail/thermostat/2017-September/024925.html
http://icedtea.classpath.org/pipermail/thermostat/2017-October/025247.html
author | Joshua Matsuoka <jmatsuok@redhat.com> |
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date | Thu, 19 Oct 2017 11:44:23 -0400 |
parents | d717e6133812 |
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.agent.internal; import java.util.concurrent.CountDownLatch; import java.util.logging.Level; import java.util.logging.Logger; import org.apache.felix.scr.annotations.Activate; import org.apache.felix.scr.annotations.Component; import org.apache.felix.scr.annotations.Deactivate; import org.apache.felix.scr.annotations.Property; import org.apache.felix.scr.annotations.Reference; import org.apache.felix.scr.annotations.Service; import org.osgi.framework.BundleContext; import com.redhat.thermostat.agent.Agent; import com.redhat.thermostat.agent.BackendConfigurationListener; import com.redhat.thermostat.agent.config.AgentConfigsUtils; import com.redhat.thermostat.agent.config.AgentOptionParser; import com.redhat.thermostat.agent.config.AgentStartupConfiguration; import com.redhat.thermostat.agent.config.AuthenticationProviderConfig; import com.redhat.thermostat.agent.dao.AgentInfoDAO; import com.redhat.thermostat.agent.dao.BackendInfoDAO; import com.redhat.thermostat.backend.BackendConfigurationRegistry; import com.redhat.thermostat.backend.BackendRegistry; import com.redhat.thermostat.backend.BackendService; import com.redhat.thermostat.common.ExitStatus; import com.redhat.thermostat.common.LaunchException; import com.redhat.thermostat.common.cli.AbstractStateNotifyingCommand; import com.redhat.thermostat.common.cli.Arguments; import com.redhat.thermostat.common.cli.Command; import com.redhat.thermostat.common.cli.CommandContext; import com.redhat.thermostat.common.cli.CommandException; import com.redhat.thermostat.common.tools.ApplicationState; import com.redhat.thermostat.common.utils.LoggingUtils; import com.redhat.thermostat.shared.config.CommonPaths; import com.redhat.thermostat.shared.config.InvalidConfigurationException; import com.redhat.thermostat.storage.core.WriterID; import sun.misc.Signal; import sun.misc.SignalHandler; @Component(immediate = true) @Property(name = Command.NAME, value = "agent") @Service(value = Command.class) @SuppressWarnings("restriction") public final class AgentApplication extends AbstractStateNotifyingCommand { /** * Property for turning on verbose mode. This is there so as to be able to * run integration tests independent of log levels. */ private static final String VERBOSE_MODE_PROPERTY = "thermostat.agent.verbose"; // Messages printed in verbose mode. Integration tests use this. Be careful // when you change those! private static final String VERBOSE_MODE_AGENT_STOPPED_MSG = "Agent stopped."; private static final String VERBOSE_MODE_AGENT_STARTED_MSG = "Agent started."; private static final String SIGINT_NAME = "INT"; private static final String SIGTERM_NAME = "TERM"; private static final Logger logger = LoggingUtils.getLogger(AgentApplication.class); private final ConfigurationCreator configurationCreator; private AgentStartupConfiguration configuration; private AgentOptionParser parser; private BundleContext context; @Reference(bind = "bindExitStatus") private ExitStatus exitStatus; @Reference(bind = "bindWriterId") private WriterID writerId; @Reference private AgentInfoDAO agentInfoDAO; @Reference private BackendInfoDAO backendInfoDAO; @Reference private CommonPaths commonPaths; @Reference private BackendConfigurationListener listener; private CountDownLatch shutdownLatch; private CustomSignalHandler handler; public AgentApplication() { this(new ConfigurationCreator()); } AgentApplication(ConfigurationCreator configurationCreator) { this.configurationCreator = configurationCreator; } @Activate public void activate(BundleContext context) { this.context = context; } @Deactivate public void deactivate(BundleContext context) { shutdown(ExitStatus.EXIT_SUCCESS); } private void parseArguments(Arguments args) throws InvalidConfigurationException { parser = new AgentOptionParser(configuration, args); parser.parse(); } private void runAgent(CommandContext ctx) throws CommandException { long startTime = System.currentTimeMillis(); configuration.setStartTime(startTime); shutdownLatch = new CountDownLatch(1); Agent agent = startAgent(agentInfoDAO, backendInfoDAO); handler = new CustomSignalHandler(agent); Signal.handle(new Signal(SIGINT_NAME), handler); Signal.handle(new Signal(SIGTERM_NAME), handler); try { // Wait for either SIGINT or SIGTERM shutdownLatch.await(); logger.fine("terminating agent cmd"); } catch (InterruptedException e) { // Ensure proper shutdown if interrupted handler.handle(new Signal(SIGINT_NAME)); return; } } @Override public void run(CommandContext ctx) throws CommandException { configuration = configurationCreator.create(commonPaths); context.registerService(AuthenticationProviderConfig.class, configuration, null); parseArguments(ctx.getArguments()); if (!parser.isHelp()) { runAgent(ctx); } } public void shutdown(int shutDownStatus) { // Exit application if (shutdownLatch != null) { shutdownLatch.countDown(); } this.exitStatus.setExitStatus(shutDownStatus); if (shutDownStatus == ExitStatus.EXIT_SUCCESS) { getNotifier().fireAction(ApplicationState.STOP); } else { getNotifier().fireAction(ApplicationState.FAIL); } } private class CustomSignalHandler implements SignalHandler { private Agent agent; public CustomSignalHandler(Agent agent) { this.agent = agent; } @Override public void handle(Signal arg0) { try { agent.stop(); } catch (Exception ex) { // We don't want any exception to hold back the signal handler, otherwise // there will be no way to actually stop Thermostat. ex.printStackTrace(); } logger.fine("Agent stopped."); // Hook for integration tests. Print a well known message to stdout // if verbose mode is turned on via the system property. if (Boolean.getBoolean(VERBOSE_MODE_PROPERTY)) { System.out.println(VERBOSE_MODE_AGENT_STOPPED_MSG); } shutdown(ExitStatus.EXIT_SUCCESS); } } Agent startAgent(AgentInfoDAO agentInfoDAO, BackendInfoDAO backendInfoDAO) { BackendRegistry backendRegistry = null; BackendConfigurationRegistry configurationRegistry = null; try { backendRegistry = new BackendRegistry(context); configurationRegistry = new BackendConfigurationRegistry(context); configurationRegistry.addActionListener(listener); } catch (Exception e) { logger.log(Level.SEVERE, "Could not get BackendRegistry instance.", e); shutdown(ExitStatus.EXIT_ERROR); // Since this would throw NPE's down the line if we continue in this // method, let's fail right and early :) throw new RuntimeException(e); } final Agent agent = new Agent(backendRegistry, configuration, agentInfoDAO, backendInfoDAO, writerId, configurationRegistry); try { logger.fine("Starting agent."); agent.start(); context.registerService(BackendService.class, new BackendService(), null); } catch (LaunchException le) { logger.log(Level.SEVERE, "Agent could not start, probably because a configured backend could not be activated.", le); shutdown(ExitStatus.EXIT_ERROR); } logger.fine("Agent started."); // Hook for integration tests. Print a well known message to stdout // if verbose mode is turned on via the system property. if (Boolean.getBoolean(VERBOSE_MODE_PROPERTY)) { System.out.println(VERBOSE_MODE_AGENT_STARTED_MSG); } logger.info("Agent id: " + agent.getId()); getNotifier().fireAction(ApplicationState.START, agent.getId()); return agent; } static class ConfigurationCreator { public AgentStartupConfiguration create(CommonPaths commonPaths) throws InvalidConfigurationException { AgentConfigsUtils.setConfigFiles(commonPaths.getSystemAgentConfigurationFile(), commonPaths.getUserAgentConfigurationFile()); return AgentConfigsUtils.createAgentConfigs(); } } @Override public boolean isStorageRequired() { return false; } // DS runtime bind methods protected void bindExitStatus(ExitStatus status) { this.exitStatus = status; } protected void bindWriterId(WriterID id) { this.writerId = id; } }