content: package org.apache.cassandra.tools;
  /*
   *
   * 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.
   *
   */
  
  
  import java.io.Closeable;
  import java.io.IOException;
  import java.io.PrintStream;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.management.MBeanServerConnection;
  import javax.management.remote.JMXConnector;
  import javax.management.remote.JMXConnectorFactory;
  import javax.management.remote.JMXServiceURL;
  
  import org.apache.commons.cli.CommandLine;
  import org.apache.commons.cli.CommandLineParser;
  import org.apache.commons.cli.Option;
  import org.apache.commons.cli.Options;
  import org.apache.commons.cli.ParseException;
  import org.apache.commons.cli.PosixParser;
  
  public abstract class AbstractJmxClient implements Closeable
  {
      private static final Options options = new Options();
      protected static final int DEFAULT_JMX_PORT = 7199;
      protected static final String DEFAULT_HOST = "localhost";
  
      protected final String host;
      protected final int port;
      protected final String username;
      protected final String password;
      protected JMXConnection jmxConn;
      protected PrintStream out = System.out;
  
      static
      {
          options.addOption("h", "host", true,  "JMX hostname or IP address (Default: localhost)");
          options.addOption("p", "port", true,  "JMX port number (Default: 7199)");
          options.addOption("u", "username", true,  "JMX username");
          options.addOption("pw", "password", true,  "JMX password");
          options.addOption("H", "help", false, "Print help information");
      }
  
      public AbstractJmxClient(String host, Integer port, String username, String password) throws IOException
      {
          this.host = (host != null) ? host : DEFAULT_HOST;
          this.port = (port != null) ? port : DEFAULT_JMX_PORT;
          this.username = username;
          this.password = password;
          jmxConn = new JMXConnection(this.host, this.port, username, password);
      }
  
      public void close() throws IOException
      {
          jmxConn.close();
      }
  
      public void writeln(Throwable err)
      {
          writeln(err.getMessage());
      }
  
      public void writeln(String msg)
      {
          out.println(msg);
      }
  
      public void write(String msg)
      {
          out.print(msg);
      }
  
      public void writeln(String format, Object...args)
      {
          write(format + "%n", args);
      }
  
      public void write(String format, Object...args)
      {
          out.printf(format, args);
      }
  
      public void setOutput(PrintStream out)
      {
          this.out = out;
      }
  
      public static CommandLine processArguments(String[] args) throws ParseException
      {
          CommandLineParser parser = new PosixParser();
          return parser.parse(options, args);
      }
  
      public static void addCmdOption(String shortOpt, String longOpt, boolean hasArg, String description)
      {
          options.addOption(shortOpt, longOpt, hasArg, description);
      }
  
      public static void printHelp(String synopsis, String header)
      {
          System.out.printf("Usage: %s%n%n", synopsis);
          System.out.print(header);
          System.out.println("Options:");
          for (Object opt : options.getOptions())
          {
              String shortOpt = String.format("%s,", ((Option)opt).getOpt());
              String longOpt = ((Option)opt).getLongOpt();
              String description = ((Option)opt).getDescription();
              System.out.printf(" -%-4s --%-17s %s%n", shortOpt, longOpt, description);
          }
      }
  }
  
  class JMXConnection
  {
      private static final String FMT_URL = "service:jmx:rmi:///jndi/rmi://%s:%d/jmxrmi";
      private final String host, username, password;
      private final int port;
      private JMXConnector jmxc;
      private MBeanServerConnection mbeanServerConn;
  
      JMXConnection(String host, int port, String username, String password) throws IOException
      {
          this.host = host;
          this.port = port;
          this.username = username;
          this.password = password;
          connect();
      }
  
      private void connect() throws IOException
      {
          JMXServiceURL jmxUrl = new JMXServiceURL(String.format(FMT_URL, host, port));
          Map<String, Object> env = new HashMap<String, Object>();
  
          if (username != null)
              env.put(JMXConnector.CREDENTIALS, new String[]{ username, password });
  
          jmxc = JMXConnectorFactory.connect(jmxUrl, env);
          mbeanServerConn = jmxc.getMBeanServerConnection();
      }
  
      public void close() throws IOException
      {
          jmxc.close();
      }
  
      public MBeanServerConnection getMbeanServerConn()
      {
          return mbeanServerConn;
      }
  }
  