/**
 * 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.batch;

import backtype.storm.task.TopologyContext;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.FailedException;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import com.alibaba.jstorm.batch.BatchId;
import com.alibaba.jstorm.batch.IBatchSpout;
import java.util.Map;
import java.util.Random;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SimpleSpout implements IBatchSpout {
    private static final Logger LOG       = LoggerFactory.getLogger(SimpleSpout.class);
    private Random              rand;
    private int                 batchSize = 100;
    
    @Override
    public void prepare(Map stormConf, TopologyContext context) {
        rand = new Random();
        rand.setSeed(System.currentTimeMillis());
    }
    
    @Override
    public void execute(Tuple input, BasicOutputCollector collector) {
        BatchId batchId = (BatchId) input.getValue(0);
        
        for (int i = 0; i < batchSize; i++) {
            long value = rand.nextInt(10);
            collector.emit(new Values(batchId, value));
        }
    }
    
    @Override
    public void cleanup() {
    }
    
    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("BatchId", "Value"));
    }
    
    @Override
    public Map<String, Object> getComponentConfiguration() {
        return null;
    }
    
    @Override
    public byte[] commit(BatchId id) throws FailedException {
        LOG.info("Receive BatchId " + id);
        return null;
    }
    
    @Override
    public void revert(BatchId id, byte[] commitResult) {
        LOG.info("Receive BatchId " + id);
    }
    
}