/**
 * 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 com.alipay.dw.jstorm.example.window;

import java.util.List;
import java.util.Map;

import org.apache.storm.starter.bolt.PrinterBolt;
import org.apache.storm.starter.bolt.SlidingWindowSumBolt;
import org.apache.storm.starter.spout.RandomIntegerSpout;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.alibaba.starter.utils.Assert;
import com.alibaba.starter.utils.JStormHelper;

import backtype.storm.Config;
import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.topology.base.BaseWindowedBolt;
import backtype.storm.topology.base.BaseWindowedBolt.Count;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import backtype.storm.windowing.TupleWindow;

/**
 * A sample topology that demonstrates the usage of
 * {@link org.apache.storm.topology.IWindowedBolt} to calculate sliding window
 * sum.
 */
public class SlidingWindowTopology {
    
    private static final Logger LOG = LoggerFactory.getLogger(SlidingWindowTopology.class);
    
    /*
     * Computes tumbling window average
     */
    private static class TumblingWindowAvgBolt extends BaseWindowedBolt {
        private OutputCollector collector;
        
        @Override
        public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
            this.collector = collector;
        }
        
        @Override
        public void execute(TupleWindow inputWindow) {
            int sum = 0;
            List<Tuple> tuplesInWindow = inputWindow.get();
            LOG.debug("Events in current window: " + tuplesInWindow.size());
            if (tuplesInWindow.size() > 0) {
                /*
                 * Since this is a tumbling window calculation, we use all the
                 * tuples in the window to compute the avg.
                 */
                for (Tuple tuple : tuplesInWindow) {
                    sum += (int) tuple.getValue(0);
                }
                collector.emit(new Values(sum / tuplesInWindow.size()));
            }
        }
        
        @Override
        public void declareOutputFields(OutputFieldsDeclarer declarer) {
            declarer.declare(new Fields("avg"));
        }
    }
    
    static boolean isLocal = true;
    static Config  conf    = JStormHelper.getConfig(null);
    
    public static void test() {
        
        String[] className = Thread.currentThread().getStackTrace()[1].getClassName().split("\\.");
        String topologyName = className[className.length - 1];
        
        try {
            TopologyBuilder builder = new TopologyBuilder();
            builder.setSpout("integer", new RandomIntegerSpout(), 1);
            builder.setBolt("slidingsum", new SlidingWindowSumBolt().withWindow(new Count(30), new Count(10)), 1)
                    .shuffleGrouping("integer");
            builder.setBolt("tumblingavg", new TumblingWindowAvgBolt().withTumblingWindow(new Count(3)), 1)
                    .shuffleGrouping("slidingsum");
            builder.setBolt("printer", new PrinterBolt(), 1).shuffleGrouping("tumblingavg");
            
            conf.setDebug(true);
            
            JStormHelper.runTopology(builder.createTopology(), topologyName, conf, 60,
                    new JStormHelper.CheckAckedFail(conf), isLocal);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.fillInStackTrace();
            Assert.fail("Failed to submit topology");
        }
    }
    
    public static void main(String[] args) throws Exception {
        isLocal = false;
        conf = JStormHelper.getConfig(args);
        test();
    }
    
}