at.storm.bolt.PreprocessorBolt.java Source code

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Here is the source code for at.storm.bolt.PreprocessorBolt.java

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/**
 * 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 at.storm.bolt;

import java.util.List;
import java.util.Map;

import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.BasicOutputCollector;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseBasicBolt;
import org.apache.storm.tuple.Tuple;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gson.JsonObject;

import at.storm.bolt.values.data.PreprocessorBoltData;
import at.storm.bolt.values.data.TokenizerBoltData;
import at.storm.bolt.values.statistic.tuple.TupleStatistic;
import at.storm.components.Preprocessor;

public class PreprocessorBolt extends BaseBasicBolt {
    public static final String ID = "preprocessor-bolt";
    public static final String CONF_LOGGING = ID + ".logging";
    private static final long serialVersionUID = -8518185528053643981L;
    private static final Logger LOG = LoggerFactory.getLogger(PreprocessorBolt.class);
    private boolean m_logging = false;
    private Preprocessor m_preprocessor;

    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        // key of output tuples
        declarer.declare(PreprocessorBoltData.getSchema());
    }

    @SuppressWarnings("rawtypes")
    @Override
    public void prepare(Map config, TopologyContext context) {
        // Optional set logging
        if (config.get(CONF_LOGGING) != null) {
            m_logging = (Boolean) config.get(CONF_LOGGING);
        } else {
            m_logging = false;
        }

        // Load Preprocessor
        m_preprocessor = Preprocessor.getInstance();
    }

    @Override
    public void execute(Tuple tuple, BasicOutputCollector collector) {
        TokenizerBoltData tokenizerBoltValue = TokenizerBoltData.getFromTuple(tuple);

        JsonObject jsonObject = tokenizerBoltValue.getJsonObject();
        TupleStatistic tupleStatistic = tokenizerBoltValue.getTupleStatistic();
        List<String> tokens = (List<String>) tokenizerBoltValue.getTokens();

        // Preprocess
        List<String> preprocessedTokens = m_preprocessor.preprocess(tokens);

        if (m_logging) {
            LOG.info("PREPROCESSOR:  TOKENS " + preprocessedTokens + "    JSON: " + jsonObject.toString());
        }

        // Emit new tuples
        collector.emit(new PreprocessorBoltData(jsonObject, tupleStatistic, preprocessedTokens));
    }

}