com.boozallen.cognition.ingest.storm.bolt.logic.SkipFieldValueBolt.java Source code

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Here is the source code for com.boozallen.cognition.ingest.storm.bolt.logic.SkipFieldValueBolt.java

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/*
 * Licensed to Booz Allen Hamilton under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Booz Allen Hamilton 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 com.boozallen.cognition.ingest.storm.bolt.logic;

import com.boozallen.cognition.ingest.storm.vo.LogRecord;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Stop processing of a record if value of given field matches specified value.
 * <p>
 * Example skipping record if "verb" field is "delete":
 * <pre>
 * {@code
 *
 * <conf>
 *   <field>verb</field>
 *   <value>delete</value>
 * </conf>
 * } </pre>
 *
 * @author bentse
 */
public class SkipFieldValueBolt extends AbstractLogicBolt {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    public static final String FIELD = "field";
    public static final String VALUE = "value";

    String field;
    String value;

    @Override
    public void configure(Configuration conf) {
        field = conf.getString(FIELD);
        value = conf.getString(VALUE);

        Validate.notBlank(field);
        Validate.notBlank(value);
    }

    @Override
    protected boolean shouldEmit(LogRecord record) {
        String value = record.getValue(field);
        if (StringUtils.equals(value, this.value))
            return false;
        else
            return true;
    }
}