Java tutorial
/* * RHQ Management Platform * Copyright (C) 2005-2008 Red Hat, Inc. * All rights reserved. * * This program 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 version 2 of the License. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ package org.rhq.enterprise.gui.legacy.action.resource.common.events; import java.util.StringTokenizer; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.util.MessageResources; import org.rhq.core.clientapi.util.StringUtil; import org.rhq.core.clientapi.util.TimeUtil; import org.rhq.core.domain.auth.Subject; import org.rhq.core.domain.common.EntityContext; import org.rhq.core.domain.event.EventSeverity; import org.rhq.core.domain.event.composite.EventComposite; import org.rhq.core.domain.util.PageControl; import org.rhq.core.domain.util.PageList; import org.rhq.enterprise.gui.legacy.AttrConstants; import org.rhq.enterprise.gui.legacy.DefaultConstants; import org.rhq.enterprise.gui.legacy.ParamConstants; import org.rhq.enterprise.gui.legacy.RetCodeConstants; import org.rhq.enterprise.gui.legacy.StringConstants; import org.rhq.enterprise.gui.legacy.WebUser; import org.rhq.enterprise.gui.legacy.action.BaseAction; import org.rhq.enterprise.gui.legacy.util.SessionUtils; import org.rhq.enterprise.gui.util.WebUtility; import org.rhq.enterprise.server.event.EventManagerLocal; import org.rhq.enterprise.server.measurement.MeasurementPreferences; import org.rhq.enterprise.server.measurement.MeasurementPreferences.MetricRangePreferences; import org.rhq.enterprise.server.util.LookupUtil; /** * Set an array for the timeline display in EventLogs.jsp, showEventDetails(). * The JavaScript function showEventDetails() is actually defined in Indicators.jsp * * @author Heiko W. Rupp */ public class EventDetailsAction extends BaseAction { /** How many chars of a detail do we show at most */ private static final int DETAIL_MAX_LEN = 100; /** How many events do we show at most per dot */ private static final int MAX_EVENTS_PER_DOT = 30; Log log = LogFactory.getLog(EventDetailsAction.class); @Override public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { try { WebUser user = SessionUtils.getWebUser(request.getSession()); MeasurementPreferences preferences = user.getMeasurementPreferences(); MetricRangePreferences rangePreferences = preferences.getMetricRangePreferences(); long begin = rangePreferences.begin; long end = rangePreferences.end; long interval = TimeUtil.getInterval(begin, end, DefaultConstants.DEFAULT_CHART_POINTS); begin = Long.parseLong(WebUtility.getOptionalRequestParameter(request, "begin", "0")); int resourceId = WebUtility.getOptionalIntRequestParameter(request, ParamConstants.RESOURCE_ID_PARAM, -1); int groupId = WebUtility.getOptionalIntRequestParameter(request, ParamConstants.GROUP_ID_PARAM, -1); int parent = WebUtility.getOptionalIntRequestParameter(request, "parent", -1); int type = WebUtility.getOptionalIntRequestParameter(request, "type", -1); String mode = WebUtility.getOptionalRequestParameter(request, "mode", "normal"); EventManagerLocal eventManager = LookupUtil.getEventManager(); Subject subject = user.getSubject(); EntityContext context = new EntityContext(resourceId, groupId, parent, type); PageList<EventComposite> events = eventManager.findEventComposites(subject, context, begin, begin + interval, null, null, null, new PageControl(0, MAX_EVENTS_PER_DOT)); MessageResources res = getResources(request); StringBuffer html; if (events.isEmpty()) { html = new StringBuffer(res.getMessage("resource.common.monitor.text.events.None")); } else { html = new StringBuffer("<ul class=\"boxy\">"); for (EventComposite event : events) { html.append("<li> "); EventSeverity severity = event.getSeverity(); switch (severity) { case FATAL: html.append("<img src=\"/images/event_fatal.gif\"/>"); break; case ERROR: html.append("<img src=\"/images/event_error.gif\"/>"); break; case WARN: html.append("<img src=\"/images/event_warn.gif\"/>"); break; case INFO: html.append("<img src=\"/images/event_info.gif\"/>"); break; case DEBUG: html.append("<img src=\"/images/event_debug.gif\"/>"); break; } html.append(" "); createLinkForResource(mode, resourceId, groupId, parent, type, html, event, ridBadChars(event.getEventDetail())); html.append("</li>"); } html.append("</ul>"); if (events.getTotalSize() > MAX_EVENTS_PER_DOT) { EventComposite event = events.get(events.size() - 1); // take the last one to initialize the list html.append("<p/>"); createLinkForResource(mode, resourceId, groupId, parent, type, html, event, res.getMessage("resource.common.monitor.text.events.MoreEvents")); html.append("<p/>"); } } request.setAttribute(AttrConstants.AJAX_TYPE, StringConstants.AJAX_ELEMENT); request.setAttribute(AttrConstants.AJAX_ID, "eventsSummary"); request.setAttribute(AttrConstants.AJAX_HTML, html); } catch (Exception e) { log.error("Error getting AJAX-style event details", e); } return mapping.findForward(RetCodeConstants.SUCCESS_URL); } private void createLinkForResource(String mode, int resourceId, int groupId, int parent, int type, StringBuffer html, EventComposite event, String text) { log.info("mode = " + mode); if (mode.equals("plain")) { String context = (resourceId > -1) ? "Resource/" : "ResourceGroup/"; int contextId = (resourceId > -1) ? resourceId : groupId; html.append("<a target=\"_top\" href=\"/coregui/CoreGUI.html#").append(context).append(contextId); html.append("/Events/History/").append(event.getEventId()).append("\">"); html.append(text); html.append("</a> "); } else { //html.append("<a href=\"/resource/common/Events.do?mode=events&eventId="); html.append("<a href=\"/rhq/resource/events/history.xhtml?eventId="); html.append(event.getEventId()); if (resourceId > -1) { html.append("&id=").append(event.getResourceId()); } else if (groupId > -1) { html.append("&groupId=").append(groupId); } else { html.append("&parent=").append(parent).append("&type=").append(type); } html.append("\">"); //html.append(event.getEventId()); if (text.contains("\n")) { text = text.substring(0, text.indexOf("\n")); } if (text.length() > DETAIL_MAX_LEN) { text = text.substring(0, DETAIL_MAX_LEN - 1); } html.append(text); html.append("</a>"); html.append(" "); } } // In our Javascript, we are enclosing the whole string in single-quotes. // However, just escaping it does not seem to work because we are setting // the innerHTML. So, just to be safe, we're getting rid of all single // quotes, double quotes, whitespace characters, and carat private String ridBadChars(String source) { int sourceLen = source.length(); if (sourceLen == 0) { return source; } StringTokenizer st = new StringTokenizer(source); StringBuffer buffer = new StringBuffer(); while (st.hasMoreElements()) { String tok = st.nextToken(); tok = tok.replaceAll("['\"]", " "); if (tok.indexOf('<') > -1) { tok = StringUtil.replace(tok, "<", "<"); } buffer.append(tok).append(" "); } return buffer.toString(); } }