org.apache.eagle.log4j.kafka.hadoop.GenericLogKeyer.scala Maven / Gradle / Ivy

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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 org.apache.eagle.log4j.kafka.hadoop

import java.util.Properties
import java.util.regex.{Matcher, Pattern}
import org.apache.eagle.log4j.kafka.Keyer

import scala.util.matching.Regex

class GenericLogKeyer(props:Properties) extends Keyer {
  /**
   * Uses the key to calculate a partition bucket id for routing
   * the data to the appropriate broker partition
   * @return returns a key based on the message
   */
  override def getKey(msg: String): String = {
    val keyPattern = props.getProperty("keyPattern");
    if(keyPattern == null) return null
    val pattern = new Regex(keyPattern, "key");
    val result = pattern.findFirstMatchIn(msg).getOrElse(null);
    if (result == null) {
      return null;
    }
    return result.group("key");
  }
}