001/**
002 * Copyright (c) 2012, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.storm.bolt;
031
032import java.util.Map;
033
034import backtype.storm.task.OutputCollector;
035import backtype.storm.task.TopologyContext;
036import backtype.storm.topology.IRichBolt;
037import backtype.storm.topology.OutputFieldsDeclarer;
038import backtype.storm.tuple.Tuple;
039
040/**
041 * A simple bolt that prints what it sees
042 * 
043 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
044 * 
045 */
046public class PrintingBolt implements IRichBolt {
047
048        /**
049         *
050         */
051        private static final long serialVersionUID = 6446447769256755247L;
052        private static final String fieldValueFormat = "(%s) %s";
053        private OutputCollector collector;
054
055        @Override
056        public void declareOutputFields(OutputFieldsDeclarer declarer) {
057                // System.out.println("declarer called!");
058        }
059
060        @Override
061        public Map<String, Object> getComponentConfiguration() {
062                // TODO Auto-generated method stub
063                return null;
064        }
065
066        @SuppressWarnings("rawtypes")
067        @Override
068        public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
069                this.collector = collector;
070
071        }
072
073        @Override
074        public void execute(Tuple input) {
075                for (final String field : input.getFields()) {
076                        final Object value = input.getValueByField(field);
077                        System.out.println(String.format(fieldValueFormat, field, value));
078                }
079                collector.ack(input);
080
081        }
082
083        @Override
084        public void cleanup() {
085        }
086}