/**
 * 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.storm.starter;

import com.alibaba.starter.utils.Assert;
import com.alibaba.jstorm.utils.JStormUtils;

import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.LocalDRPC;
import backtype.storm.drpc.DRPCSpout;
import backtype.storm.drpc.ReturnResults;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.topology.base.BaseBasicBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;

public class ManualDRPC {
    public static class ExclamationBolt extends BaseBasicBolt {
        
        @Override
        public void declareOutputFields(OutputFieldsDeclarer declarer) {
            declarer.declare(new Fields("result", "return-info"));
        }
        
        @Override
        public void execute(Tuple tuple, BasicOutputCollector collector) {
            String arg = tuple.getString(0);
            Object retInfo = tuple.getValue(1);
            collector.emit(new Values(arg + "!!!", retInfo));
        }
        
    }
    
    public static void testDrpc() {
        TopologyBuilder builder = new TopologyBuilder();
        LocalDRPC drpc = new LocalDRPC();
        
        DRPCSpout spout = new DRPCSpout("exclamation", drpc);
        builder.setSpout("drpc", spout);
        builder.setBolt("exclaim", new ExclamationBolt(), 3).shuffleGrouping("drpc");
        builder.setBolt("return", new ReturnResults(), 3).shuffleGrouping("exclaim");
        
        LocalCluster cluster = new LocalCluster();
        Config conf = new Config();
        cluster.submitTopology("exclaim", conf, builder.createTopology());
        
        JStormUtils.sleepMs(30 * 1000);
        
        try {
            System.out.println(drpc.execute("exclamation", "aaa"));
            System.out.println(drpc.execute("exclamation", "bbb"));
        } catch (Exception e) {
            Assert.fail("Failed to test drpc");
        }
        
        drpc.shutdown();
        cluster.shutdown();
    }
    
    public static void main(String[] args) {
        
        testDrpc();
    }
}