MaxMetric.java

/**
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.storm.kafka.trident;


import org.apache.storm.metric.api.ICombiner;

public class MaxMetric implements ICombiner<Long> {
  @Override
  public Long identity() {
    return null;
  }

  @Override
  public Long combine(Long l1, Long l2) {
    if (l1 == null) {
      return l2;
    }
    if (l2 == null) {
      return l1;
    }
    return Math.max(l1, l2);
  }

}