001/**
002 * Copyright (c) 2011, 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.tools.twitter.bolts;
031
032import java.util.Map;
033
034import org.slf4j.Logger;
035import org.slf4j.LoggerFactory;
036
037import backtype.storm.task.OutputCollector;
038import backtype.storm.task.TopologyContext;
039import backtype.storm.topology.OutputFieldsDeclarer;
040import backtype.storm.topology.base.BaseRichBolt;
041import backtype.storm.tuple.Fields;
042import backtype.storm.tuple.Tuple;
043
044public abstract class BaseTwitterRichBolt extends BaseRichBolt {
045        private static final long serialVersionUID = 1L;
046
047        private OutputCollector collector;
048        Logger logger = LoggerFactory.getLogger(BaseRichBolt.class);
049
050        @SuppressWarnings("rawtypes")
051        @Override
052        public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
053                this.collector = collector;
054                this.prepare();
055        }
056
057        @Override
058        public void declareOutputFields(OutputFieldsDeclarer declarer) {
059                new Fields("tweet");
060        }
061
062        @Override
063        public void execute(Tuple input) {
064                try {
065                        final String t = (String) input.getValueByField("tweet");
066                        processTweet(t);
067                } catch (final Exception e) {
068                        logger.error("Failed to read tweet from tuple: ", e);
069                }
070                collector.ack(input);
071        }
072
073        public abstract void processTweet(String string) throws Exception;
074
075        public abstract void prepare();
076}