Java tutorial
/******************************************************************************* * This file is part of OpenNMS(R). * * Copyright (C) 2010-2012 The OpenNMS Group, Inc. * OpenNMS(R) is Copyright (C) 1999-2012 The OpenNMS Group, Inc. * * OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc. * * OpenNMS(R) 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 3 of the License, * or (at your option) any later version. * * OpenNMS(R) 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 OpenNMS(R). If not, see: * http://www.gnu.org/licenses/ * * For more information contact: * OpenNMS(R) Licensing <license@opennms.org> * http://www.opennms.org/ * http://www.opennms.com/ *******************************************************************************/ package org.opennms.features.poller.remote.gwt.server; import java.util.Date; import java.util.List; import java.util.Timer; import java.util.TimerTask; import org.hibernate.criterion.Restrictions; import org.opennms.core.utils.BeanUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.opennms.features.poller.remote.gwt.client.ApplicationInfo; import org.opennms.features.poller.remote.gwt.client.location.LocationInfo; import org.opennms.features.poller.remote.gwt.client.remoteevents.ApplicationUpdatedRemoteEvent; import org.opennms.features.poller.remote.gwt.client.remoteevents.LocationUpdatedRemoteEvent; import org.opennms.netmgt.EventConstants; import org.opennms.netmgt.dao.api.EventDao; import org.opennms.netmgt.model.OnmsCriteria; import org.opennms.netmgt.model.OnmsEvent; import org.opennms.netmgt.model.events.Parameter; import org.opennms.netmgt.model.events.annotations.EventHandler; import org.opennms.netmgt.model.events.annotations.EventListener; import org.opennms.netmgt.xml.event.Event; import org.opennms.netmgt.xml.event.Parm; import org.springframework.beans.factory.DisposableBean; import org.springframework.beans.factory.InitializingBean; import org.springframework.beans.factory.annotation.Autowired; /** * <p>LocationBroadcastProcessor class.</p> * * @author ranger * @version $Id: $ * @since 1.8.1 */ @EventListener(name = "LocationStatusService") public class LocationBroadcastProcessor implements InitializingBean, DisposableBean { private static final Logger LOG = LoggerFactory.getLogger(LocationBroadcastProcessor.class); @Autowired private LocationDataService m_locationDataService; @Autowired private EventDao m_eventDao; @SuppressWarnings("unused") private static final long UPDATE_PERIOD = 1000 * 60; @SuppressWarnings("unused") private static volatile Timer m_timer; private String[] m_events = new String[] { EventConstants.LOCATION_MONITOR_STARTED_UEI, EventConstants.LOCATION_MONITOR_STOPPED_UEI, EventConstants.LOCATION_MONITOR_DISCONNECTED_UEI, EventConstants.LOCATION_MONITOR_RECONNECTED_UEI, EventConstants.LOCATION_MONITOR_REGISTERED_UEI, EventConstants.LOCATION_MONITOR_PAUSED_UEI, EventConstants.REMOTE_NODE_LOST_SERVICE_UEI, EventConstants.REMOTE_NODE_REGAINED_SERVICE_UEI }; public LocationEventHandler m_eventHandler; private TimerTask m_task; /** * <p>Constructor for LocationBroadcastProcessor.</p> */ public LocationBroadcastProcessor() { m_timer = new Timer(); } /** * <p>afterPropertiesSet</p> * * @throws java.lang.Exception if any. */ @Override public void afterPropertiesSet() throws Exception { BeanUtils.assertAutowiring(this); m_task = new TimerTask() { private Date m_lastRun = new Date(); @Override public void run() { final Date now = new Date(); final OnmsCriteria criteria = new OnmsCriteria(OnmsEvent.class) .add(Restrictions.between("eventTime", m_lastRun, now)) .add(Restrictions.in("eventUei", m_events)); for (final OnmsEvent e : m_eventDao.findMatching(criteria)) { handleLocationEvent(e); } m_lastRun = now; } }; //m_timer.schedule(m_task, UPDATE_PERIOD, UPDATE_PERIOD); } /** * <p>destroy</p> */ @Override public void destroy() { if (m_task != null) { m_task.cancel(); } } /** * <p>locationMonitorStarted</p> * * @param event a {@link org.opennms.netmgt.xml.event.Event} object. */ @EventHandler(uei = EventConstants.LOCATION_MONITOR_STARTED_UEI) public void locationMonitorStarted(final Event event) { handleLocationEvent(event); } /** * <p>locationMonitorStopped</p> * * @param event a {@link org.opennms.netmgt.xml.event.Event} object. */ @EventHandler(uei = EventConstants.LOCATION_MONITOR_STOPPED_UEI) public void locationMonitorStopped(final Event event) { handleLocationEvent(event); } /** * <p>locationMonitorDisconnected</p> * * @param event a {@link org.opennms.netmgt.xml.event.Event} object. */ @EventHandler(uei = EventConstants.LOCATION_MONITOR_DISCONNECTED_UEI) public void locationMonitorDisconnected(final Event event) { handleLocationEvent(event); } /** * <p>locationMonitorReconnected</p> * * @param event a {@link org.opennms.netmgt.xml.event.Event} object. */ @EventHandler(uei = EventConstants.LOCATION_MONITOR_RECONNECTED_UEI) public void locationMonitorReconnected(final Event event) { handleLocationEvent(event); } /** * <p>locationMonitorRegistered</p> * * @param event a {@link org.opennms.netmgt.xml.event.Event} object. */ @EventHandler(uei = EventConstants.LOCATION_MONITOR_REGISTERED_UEI) public void locationMonitorRegistered(final Event event) { handleLocationEvent(event); } /** * <p>locationMonitorPaused</p> * * @param event a {@link org.opennms.netmgt.xml.event.Event} object. */ @EventHandler(uei = EventConstants.LOCATION_MONITOR_PAUSED_UEI) public void locationMonitorPaused(final Event event) { handleLocationEvent(event); } /** * <p>nodeLostService</p> * * @param event a {@link org.opennms.netmgt.xml.event.Event} object. */ @EventHandler(uei = EventConstants.REMOTE_NODE_LOST_SERVICE_UEI) public void nodeLostService(final Event event) { handleLocationEvent(event); } /** * <p>nodeRegainedService</p> * * @param event a {@link org.opennms.netmgt.xml.event.Event} object. */ @EventHandler(uei = EventConstants.REMOTE_NODE_REGAINED_SERVICE_UEI) public void nodeRegainedService(final Event event) { handleLocationEvent(event); } /** * <p>setEventHandler</p> * * @param handler a {@link org.opennms.features.poller.remote.gwt.server.LocationEventHandler} object. */ public void setEventHandler(final LocationEventHandler handler) { m_eventHandler = handler; } private void handleLocationEvent(final OnmsEvent event) { if (m_eventHandler == null) { LOG.warn("handleLocationEvent called, but no eventHandler is registered"); return; } handleEventParms(Parameter.decode(event.getEventParms())); } private void handleLocationEvent(final Event event) { if (m_eventHandler == null) { LOG.warn("handleLocationEvent called, but no eventHandler is registered"); return; } handleEventParms(event.getParmCollection()); } private void handleEventParms(final List<Parm> parms) { for (final Parm p : parms) { if (p.getParmName().equals(EventConstants.PARM_LOCATION_MONITOR_ID)) { final LocationInfo info = m_locationDataService .getLocationInfoForMonitor(Integer.valueOf(p.getValue().getContent())); m_eventHandler.sendEvent(new LocationUpdatedRemoteEvent(info)); for (final ApplicationInfo applicationInfo : m_locationDataService .getApplicationsForLocation(info)) { m_eventHandler.sendEvent(new ApplicationUpdatedRemoteEvent(applicationInfo)); } } } } }