content: /*
   * 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.chukwa.inputtools.jplugin;
  
  import java.util.Calendar;
  import java.util.Timer;
  import java.util.TimerTask;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.chukwa.util.ExceptionUtil;
  
  public class JPluginAgent {
    private static Log log = LogFactory.getLog(JPluginAgent.class);
  
    private static class MetricsTimerTask extends TimerTask {
      @SuppressWarnings( { "unchecked" })
      private JPlugin plugin;
  
      @SuppressWarnings("unchecked")
      public MetricsTimerTask(JPlugin plugin) {
        this.plugin = plugin;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public void run() {
        try {
          ChukwaMetricsList metrics = plugin.getMetrics();
          String xml = metrics.toXml();
          log.info(xml);
        } catch (Throwable e) {
          log.error(e.getMessage(), e);
        }
      }
    }
  
    private static class StatusTimerTask extends TimerTask {
      @SuppressWarnings( { "unchecked" })
      private JPlugin plugin;
  
      @SuppressWarnings("unchecked")
      public StatusTimerTask(JPlugin plugin) {
        this.plugin = plugin;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public void run() {
        try {
          ChukwaMetricsList metrics = plugin.getStatus();
          String xml = metrics.toXml();
          log.info(xml);
        } catch (Throwable e) {
          log.error(e.getMessage(), e);
        }
      }
    }
  
    @SuppressWarnings("unchecked")
    public static void main(String[] args) {
      if (args.length < 1) {
        System.out
            .println("Usage: java -DPERIOD=nn JavaPluginAgent <class name> [parameters]");
        return;
      }
  
      int period = -1;
      try {
        if (System.getProperty("PERIOD") != null) {
          period = Integer.parseInt(System.getProperty("PERIOD"));
        }
      } catch (NumberFormatException ex) {
        ex.printStackTrace();
        System.out.println("PERIOD should be numeric format of seconds.");
        return;
      }
  
      JPlugin plugin = null;
      try {
        plugin = (JPlugin) Class.forName(args[0]).newInstance();
        plugin.init(args);
      } catch (Throwable e) {
        e.printStackTrace();
        return;
      }
  
      try {
      } catch (Exception e) {
        e.printStackTrace();
      }
  
      Calendar cal = Calendar.getInstance();
      long now = cal.getTime().getTime();
      cal.set(Calendar.SECOND, 3);
      cal.set(Calendar.MILLISECOND, 0);
      cal.add(Calendar.MINUTE, 1);
      long until = cal.getTime().getTime();
      try {
        if (period == -1) {
          new MetricsTimerTask(plugin).run();
        } else {
          Thread.sleep(until - now);
          Timer timer = new Timer();
          timer.scheduleAtFixedRate(new MetricsTimerTask(plugin), 0,
              period * 1000);
        }
      } catch (Exception ex) {
        log.debug(ExceptionUtil.getStackTrace(ex));
      }
    }
  }
  