LogLevel.java
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上传日期:2018-01-08
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文件大小:5k
- /**
- * 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.hadoop.log;
- import java.io.*;
- import java.net.*;
- import java.util.regex.Pattern;
- import javax.servlet.*;
- import javax.servlet.http.*;
- import org.apache.commons.logging.*;
- import org.apache.commons.logging.impl.*;
- import org.apache.hadoop.util.ServletUtil;
- /**
- * Change log level in runtime.
- */
- public class LogLevel {
- public static final String USAGES = "nUSAGES:n"
- + "java " + LogLevel.class.getName()
- + " -getlevel <host:port> <name>n"
- + "java " + LogLevel.class.getName()
- + " -setlevel <host:port> <name> <level>n";
- /**
- * A command line implementation
- */
- public static void main(String[] args) {
- if (args.length == 3 && "-getlevel".equals(args[0])) {
- process("http://" + args[1] + "/logLevel?log=" + args[2]);
- return;
- }
- else if (args.length == 4 && "-setlevel".equals(args[0])) {
- process("http://" + args[1] + "/logLevel?log=" + args[2]
- + "&level=" + args[3]);
- return;
- }
- System.err.println(USAGES);
- System.exit(-1);
- }
- private static void process(String urlstring) {
- try {
- URL url = new URL(urlstring);
- System.out.println("Connecting to " + url);
- URLConnection connection = url.openConnection();
- connection.connect();
- BufferedReader in = new BufferedReader(new InputStreamReader(
- connection.getInputStream()));
- for(String line; (line = in.readLine()) != null; )
- if (line.startsWith(MARKER)) {
- System.out.println(TAG.matcher(line).replaceAll(""));
- }
- in.close();
- } catch (IOException ioe) {
- System.err.println("" + ioe);
- }
- }
- static final String MARKER = "<!-- OUTPUT -->";
- static final Pattern TAG = Pattern.compile("<[^>]*>");
- /**
- * A servlet implementation
- */
- public static class Servlet extends HttpServlet {
- private static final long serialVersionUID = 1L;
- public void doGet(HttpServletRequest request, HttpServletResponse response
- ) throws ServletException, IOException {
- PrintWriter out = ServletUtil.initHTML(response, "Log Level");
- String logName = ServletUtil.getParameter(request, "log");
- String level = ServletUtil.getParameter(request, "level");
- if (logName != null) {
- out.println("<br /><hr /><h3>Results</h3>");
- out.println(MARKER
- + "Submitted Log Name: <b>" + logName + "</b><br />");
- Log log = LogFactory.getLog(logName);
- out.println(MARKER
- + "Log Class: <b>" + log.getClass().getName() +"</b><br />");
- if (level != null) {
- out.println(MARKER + "Submitted Level: <b>" + level + "</b><br />");
- }
- if (log instanceof Log4JLogger) {
- process(((Log4JLogger)log).getLogger(), level, out);
- }
- else if (log instanceof Jdk14Logger) {
- process(((Jdk14Logger)log).getLogger(), level, out);
- }
- else {
- out.println("Sorry, " + log.getClass() + " not supported.<br />");
- }
- }
- out.println(FORMS);
- out.println(ServletUtil.HTML_TAIL);
- }
- static final String FORMS = "n<br /><hr /><h3>Get / Set</h3>"
- + "n<form>Log: <input type='text' size='50' name='log' /> "
- + "<input type='submit' value='Get Log Level' />"
- + "</form>"
- + "n<form>Log: <input type='text' size='50' name='log' /> "
- + "Level: <input type='text' name='level' /> "
- + "<input type='submit' value='Set Log Level' />"
- + "</form>";
- private static void process(org.apache.log4j.Logger log, String level,
- PrintWriter out) throws IOException {
- if (level != null) {
- log.setLevel(org.apache.log4j.Level.toLevel(level));
- out.println(MARKER + "Setting Level to " + level + " ...<br />");
- }
- out.println(MARKER
- + "Effective level: <b>" + log.getEffectiveLevel() + "</b><br />");
- }
- private static void process(java.util.logging.Logger log, String level,
- PrintWriter out) throws IOException {
- if (level != null) {
- log.setLevel(java.util.logging.Level.parse(level));
- out.println(MARKER + "Setting Level to " + level + " ...<br />");
- }
- java.util.logging.Level lev;
- for(; (lev = log.getLevel()) == null; log = log.getParent());
- out.println(MARKER + "Effective level: <b>" + lev + "</b><br />");
- }
- }
- }