org.apache.hadoop.chukwa.inputtools.jplugin.JPluginAgent.java Source code

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Here is the source code for org.apache.hadoop.chukwa.inputtools.jplugin.JPluginAgent.java

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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.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.DaemonWatcher;
import org.apache.hadoop.chukwa.util.PidFile;

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]");
            System.exit(0);
        }

        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.");
            System.exit(0);
        }

        JPlugin plugin = null;
        try {
            plugin = (JPlugin) Class.forName(args[0]).newInstance();
            plugin.init(args);
        } catch (Throwable e) {
            e.printStackTrace();
            System.exit(-1);
        }

        try {
            DaemonWatcher.createInstance(plugin.getRecordType() + "-data-loader");
        } 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) {
        }
    }
}