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Calrissian Flowmix- A Flexible Event Processing Engine for Apache Storm

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/*
 * Copyright (C) 2014 The Calrissian Authors
 *
 * Licensed 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.calrissian.flowmix.spout;

import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseRichSpout;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import org.calrissian.flowmix.model.Flow;

import java.util.Collection;
import java.util.Map;

public class MockFlowLoaderSpout extends BaseRichSpout{

    Collection flows;
    long pauseBetweenLoads = -1;

    boolean loaded = false;

    public static final String FLOW_LOADER_STREAM = "flowLoaderStream";

    SpoutOutputCollector collector;

    public MockFlowLoaderSpout(Collection flows, long pauseBetweenLoads) {
        this.flows = flows;
        this.pauseBetweenLoads = pauseBetweenLoads;
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {
        outputFieldsDeclarer.declareStream(FLOW_LOADER_STREAM, new Fields("flows"));
    }

    @Override
    public void open(Map map, TopologyContext topologyContext, SpoutOutputCollector spoutOutputCollector) {
        this.collector = spoutOutputCollector;

    }

    @Override
    public void nextTuple() {

      if(!loaded || pauseBetweenLoads > -1) {
        collector.emit(FLOW_LOADER_STREAM, new Values(flows));

        if(pauseBetweenLoads > -1) {
          try {
            Thread.sleep(pauseBetweenLoads);
          } catch (InterruptedException e) {
            throw new RuntimeException(e);
          }
        }
      }
    }
}