Mercurial > hg > thermostat-ng > agent
view plugins/host-memory/agent/src/main/java/com/redhat/thermostat/host/memory/agent/internal/HostMemoryBackend.java @ 2777:c30824312ec5
Add configuration to plugins to allow for deactivation of Backends at startup.
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 12:12:42 -0400 |
parents | 3f1f63227847 |
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.host.memory.agent.internal; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.logging.Level; import java.util.logging.Logger; import com.redhat.thermostat.backend.Backend; import com.redhat.thermostat.common.portability.HostName; import com.redhat.thermostat.common.portability.linux.ProcDataSource; import com.redhat.thermostat.backend.HostPollingAction; import com.redhat.thermostat.backend.HostPollingBackend; import com.redhat.thermostat.common.Version; import com.redhat.thermostat.common.utils.LoggingUtils; import com.redhat.thermostat.storage.core.WriterID; import org.apache.felix.scr.annotations.Activate; import org.apache.felix.scr.annotations.Component; import org.apache.felix.scr.annotations.ConfigurationPolicy; import org.apache.felix.scr.annotations.Deactivate; import org.apache.felix.scr.annotations.Modified; import org.apache.felix.scr.annotations.Reference; import org.apache.felix.scr.annotations.Service; import org.osgi.framework.BundleContext; @Component( policy = ConfigurationPolicy.REQUIRE, configurationPid = "host-memory" ) @Service(value = Backend.class) public class HostMemoryBackend extends HostPollingBackend { private static final Logger logger = LoggingUtils.getLogger(HostMemoryBackend.class); @Reference private MemoryStatDAO memoryStatDAO; @Reference private WriterID writerID; public HostMemoryBackend() { this(Executors.newSingleThreadScheduledExecutor()); } public HostMemoryBackend(ScheduledExecutorService executor) { this("Host Memory Backend", "Gathers memory statistics about a host", "Red Hat, Inc.", new Version(), executor); } public HostMemoryBackend(String name, String descr, String vendor, Version version, ScheduledExecutorService executor) { super(name, descr, vendor, version, executor); } @Activate protected void componentActivated(BundleContext context) { Version version = new Version(context.getBundle()); setVersion(version.getVersionNumber()); registerAction(new MemoryProcBackendAction(writerID, memoryStatDAO)); } /* * Default OSGI behaviour is to restart the component when configuration changes. * The @modified method acts as a callback to prevent this from happening since * we don't need to restart the component for our use-case. */ @Modified public void modified() throws Exception { logger.config("Doing nothing on configuration change for plugin host-memory"); } @Deactivate protected void componentDeactivated() { if (isActive()) { deactivate(); } } private static class MemoryProcBackendAction implements HostPollingAction { private MemoryStatBuilder builder; private MemoryStatDAO dao; MemoryProcBackendAction(final WriterID id, MemoryStatDAO dao) { ProcDataSource source = new ProcDataSource(); builder = new MemoryStatBuilder(source, id); this.dao = dao; } @Override public void run() { dao.put(builder.build()); } } void bindMemoryStatDAO(MemoryStatDAO dao) { this.memoryStatDAO = dao; } void bindWriterID(WriterID id) { this.writerID = id; } }