LogLevel.java

/**
 * 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.jxtadoop.log;

import java.io.*;
import java.net.*;
import java.util.regex.Pattern;


import org.apache.commons.logging.*;
import org.apache.commons.logging.impl.*;

/**
 * Change log level in runtime.
 */
@SuppressWarnings({"unused"})
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("<[^>]*>");
}