metron-streaming/Metron-Topologies/src/main/java/org/apache/metron/test/spouts/GenericInternalTestSpout.java

/**
 * 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.metron.test.spouts;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Map;

import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;
import org.apache.metron.test.converters.BinaryConverters;
import org.apache.metron.test.converters.IConverter;
import org.apache.metron.test.filereaders.FileReader;

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 backtype.storm.utils.Utils;


public class GenericInternalTestSpout extends BaseRichSpout {

	
	/**
	 * 
	 */
	private static final long serialVersionUID = -2379344923143372543L;

	List<String> jsons;
	
	private String _filename;
	private int _delay = 100;
	private boolean _repeating = true;
	
	private SpoutOutputCollector _collector;
	private IConverter _converter;
	private FileReader Reader;
	private int cnt = 0;
	
	public GenericInternalTestSpout withFilename(String filename)
	{
		if(filename != null && filename.length() > 0 && filename.charAt(0) == '$') {
			filename = Iterables.getLast(Splitter.on("}").split(filename));
		}
		_filename = filename;
		return this;
	}
	public GenericInternalTestSpout withMillisecondDelay(Integer delay)
	{
		_delay = delay;
		return this;
	}
	
	public GenericInternalTestSpout withRepeating(Boolean repeating)
	{
		_repeating = repeating;
		return this;
	}

	public GenericInternalTestSpout withBinaryConverter(String converter) {
		if(converter == null) {
			_converter = BinaryConverters.DEFAULT;
		}
		else {
			_converter = BinaryConverters.valueOf(converter);
		}
		return this;
	}


	@SuppressWarnings("rawtypes") 
	public void open(Map conf, TopologyContext context,
			SpoutOutputCollector collector) {
		
		_collector = collector;
		try {
			Reader =  new FileReader();
			jsons = Reader.readFromFile(_filename);

		} catch (Throwable e)
		{
			System.out.println("Could not read sample JSONs");
			e.printStackTrace();
		}
		
	}

	public void nextTuple() {
		Utils.sleep(_delay);
		
		if(cnt < jsons.size())
		{
			byte[] value;
			if (_converter != null) {
			  value = _converter.convert(jsons.get(cnt));
			} else {
				value = jsons.get(cnt).getBytes();
			}
			_collector.emit(new Values(value));
		}
		cnt ++;
		
		if(_repeating && cnt == jsons.size() -1 )
			cnt = 0;
	}

	@Override
	public void ack(Object id) {
	}

	@Override
	public void fail(Object id) {
	}

	public void declareOutputFields(OutputFieldsDeclarer declarer) {
		declarer.declare(new Fields("message"));
	}

}