ViewStatusMessagesServletBase.java
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.core.status;
import static ch.qos.logback.core.CoreConstants.LINE_SEPARATOR;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.List;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.helpers.Transform;
import ch.qos.logback.core.util.CachingDateFormatter;
abstract public class ViewStatusMessagesServletBase extends HttpServlet {
private static final long serialVersionUID = -3551928133801157219L;
private static CachingDateFormatter SDF = new CachingDateFormatter("yyyy-MM-dd HH:mm:ss");
static String SUBMIT = "submit";
static String CLEAR = "Clear";
protected abstract StatusManager getStatusManager(HttpServletRequest req, HttpServletResponse resp);
protected abstract String getPageTitle(HttpServletRequest req, HttpServletResponse resp);
int count;
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
count = 0;
StatusManager sm = getStatusManager(req, resp);
resp.setContentType("text/html");
PrintWriter output = resp.getWriter();
output.append("<html>\r\n");
output.append("<head>\r\n");
printCSS(req.getContextPath(), output);
output.append("</head>\r\n");
output.append("<body>\r\n");
output.append(getPageTitle(req, resp));
output.append("<form method=\"POST\">\r\n");
output.append("<input type=\"submit\" name=\"" + SUBMIT + "\" value=\"" + CLEAR + "\">");
output.append("</form>\r\n");
if (CLEAR.equalsIgnoreCase(req.getParameter(SUBMIT))) {
sm.clear();
sm.add(new InfoStatus("Cleared all status messages", this));
}
output.append("<table>");
StringBuilder buf = new StringBuilder();
if (sm != null) {
printList(buf, sm);
} else {
output.append("Could not find status manager");
}
output.append(buf);
output.append("</table>");
output.append("</body>\r\n");
output.append("</html>\r\n");
output.flush();
output.close();
}
public void printCSS(String localRef, PrintWriter output) {
output.append(" <STYLE TYPE=\"text/css\">\r\n");
output.append(" .warn { font-weight: bold; color: #FF6600;} \r\n"); // orange
output.append(" .error { font-weight: bold; color: #CC0000;} \r\n");
output.append(" table { margin-left: 2em; margin-right: 2em; border-left: 2px solid #AAA; }\r\n");
output.append(" tr.even { background: #FFFFFF; }\r\n");
output.append(" tr.odd { background: #EAEAEA; }\r\n");
output.append(" td { padding-right: 1ex; padding-left: 1ex; border-right: 2px solid #AAA; }\r\n");
output.append(" td.date { text-align: right; font-family: courier, monospace; font-size: smaller; }");
output.append(LINE_SEPARATOR);
output.append(" td.level { text-align: right; }");
output.append(LINE_SEPARATOR);
output.append(" tr.header { background: #596ED5; color: #FFF; font-weight: bold; font-size: larger; }");
output.append(CoreConstants.LINE_SEPARATOR);
output.append(" td.exception { background: #A2AEE8; white-space: pre; font-family: courier, monospace;}");
output.append(LINE_SEPARATOR);
output.append(" </STYLE>\r\n");
}
public void printList(StringBuilder buf, StatusManager sm) {
buf.append("<table>\r\n");
printHeader(buf);
List<Status> statusList = sm.getCopyOfStatusList();
for (Status s : statusList) {
count++;
printStatus(buf, s);
}
buf.append("</table>\r\n");
}
public void printHeader(StringBuilder buf) {
buf.append(" <tr class=\"header\">\r\n");
buf.append(" <th>Date </th>\r\n");
buf.append(" <th>Level</th>\r\n");
buf.append(" <th>Origin</th>\r\n");
buf.append(" <th>Message</th>\r\n");
buf.append(" </tr>\r\n");
}
String statusLevelAsString(Status s) {
switch (s.getEffectiveLevel()) {
case Status.INFO:
return "INFO";
case Status.WARN:
return "<span class=\"warn\">WARN</span>";
case Status.ERROR:
return "<span class=\"error\">ERROR</span>";
}
return null;
}
String abbreviatedOrigin(Status s) {
Object o = s.getOrigin();
if (o == null) {
return null;
}
String fqClassName = o.getClass().getName();
int lastIndex = fqClassName.lastIndexOf(CoreConstants.DOT);
if (lastIndex != -1) {
return fqClassName.substring(lastIndex + 1, fqClassName.length());
} else {
return fqClassName;
}
}
private void printStatus(StringBuilder buf, Status s) {
String trClass;
if (count % 2 == 0) {
trClass = "even";
} else {
trClass = "odd";
}
buf.append(" <tr class=\"").append(trClass).append("\">\r\n");
String dateStr = SDF.format(s.getTimestamp());
buf.append(" <td class=\"date\">").append(dateStr).append("</td>\r\n");
buf.append(" <td class=\"level\">").append(statusLevelAsString(s)).append("</td>\r\n");
buf.append(" <td>").append(abbreviatedOrigin(s)).append("</td>\r\n");
buf.append(" <td>").append(s.getMessage()).append("</td>\r\n");
buf.append(" </tr>\r\n");
if (s.getThrowable() != null) {
printThrowable(buf, s.getThrowable());
}
}
private void printThrowable(StringBuilder buf, Throwable t) {
buf.append(" <tr>\r\n");
buf.append(" <td colspan=\"4\" class=\"exception\"><pre>");
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
t.printStackTrace(pw);
buf.append(Transform.escapeTags(sw.getBuffer()));
buf.append(" </pre></td>\r\n");
buf.append(" </tr>\r\n");
}
}