org.apache.solr.servlet.LogLevelSelection Maven / Gradle / Ivy
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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.solr.servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.Logger;
/**
* Admin JDK Logger level report and selection servlet.
*
* @version $Id: LogLevelSelection.java 777492 2009-05-22 11:57:07Z markrmiller $
* @since solr 1.3
*/
public final class LogLevelSelection extends HttpServlet {
public void init() throws ServletException {
}
/**
* Processes an HTTP GET request and changes the logging level as
* specified.
*/
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
// Output page
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.write("\n");
out.write("Solr Admin: JDK Log Level Selector \n");
out.write("");
out.write("\n");
out.write("![\"Solr\"](\"solr_small.png\")
");
out.write("JDK Log Level Selector
");
out.write("Below is the complete JDK Log hierarchy with " +
"intermediate logger/categories synthesized. " +
"The effective logging level is shown to the " +
"far right. If a logger has unset level, then " +
"the effective level is that of the nearest ancestor " +
"with a level setting. Note that this only shows " +
"JDK Log levels.
\n");
out.write("\n");
out.write("\n");
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
if (request.getParameter("submit").equals("set")) {
Map paramMap = request.getParameterMap();
Iterator iParams = paramMap.entrySet().iterator();
while (iParams.hasNext()) {
Map.Entry p = (Map.Entry) iParams.next();
String name = (String) p.getKey();
String value = ((String[]) p.getValue())[0];
if (name.equals("submit")) continue;
Logger logger;
LogManager logManager = LogManager.getLogManager();
if ("root".equals(name)) {
logger = logManager.getLogger("");
} else logger = logManager.getLogger(name);
if ("unset".equals(value)) {
if ((logger != null) && (logger.getLevel() != null)) {
logger.setLevel(null);
log.info("Unset log level on '" + name + "'.");
}
} else {
Level level = Level.parse(value);
if (logger == null) logger = Logger.getLogger(name);
if (logger.getLevel() != level) {
logger.setLevel(level);
log.info("Set '" + name + "' to " +
level + " level.");
}
}
}
} else {
log.fine("Selection form cancelled");
}
// Redirect back to standard get page.
response.sendRedirect(request.getRequestURI());
}
private Collection buildWrappers() {
// Use tree to get sorted results
SortedSet roots = new TreeSet();
roots.add(LogWrapper.ROOT);
LogManager logManager = LogManager.getLogManager();
Enumeration loggerNames = logManager.getLoggerNames();
while (loggerNames.hasMoreElements()) {
String name = loggerNames.nextElement();
Logger logger = Logger.getLogger(name);
LogWrapper wrapper = new LogWrapper(logger);
roots.remove(wrapper); // Make sure add occurs
roots.add(wrapper);
while (true) {
int dot = name.lastIndexOf(".");
if (dot < 0) break;
name = name.substring(0, dot);
roots.add(new LogWrapper(name)); // if not already
}
}
return roots;
}
private Level getEffectiveLevel(Logger logger) {
Level level = logger.getLevel();
if (level != null) {
return level;
}
for (Level l : LEVELS) {
if (l == null) {
// avoid NPE
continue;
}
if (logger.isLoggable(l)) {
// return first level loggable
return l;
}
}
return Level.OFF;
}
private static class LogWrapper
implements Comparable {
public static LogWrapper ROOT =
new LogWrapper(LogManager.getLogManager().getLogger(""));
public LogWrapper(Logger logger) {
this.logger = logger;
this.name = logger.getName();
}
public LogWrapper(String name) {
this.name = name;
}
public int compareTo(Object other) {
if (this.equals(other)) return 0;
if (this == ROOT) return -1;
if (other == ROOT) return 1;
return name.compareTo(((LogWrapper) other).name);
}
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
LogWrapper other = (LogWrapper) obj;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
public Level level() {
if (logger != null) return logger.getLevel();
return null;
}
public Logger logger = null;
public String name;
}
private static Level[] LEVELS = {
null, // aka unset
Level.FINEST,
Level.FINE,
Level.CONFIG,
Level.INFO,
Level.WARNING,
Level.SEVERE,
Level.OFF
// Level.ALL -- ignore. It is useless.
};
private Logger log = Logger.getLogger(getClass().getName());
}