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The official MongoDB Apache Kafka Connect Connector.

There is a newer version: 1.13.1

/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * Licensed 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.mongodb.kafka.connect.util.jmx.internal;

import java.util.concurrent.atomic.AtomicLong;
import java.util.function.Consumer;

public class TotalMetric implements Metric {
  private final String name;
  private final AtomicLong value = new AtomicLong();

  public TotalMetric(final String name) {
    this.name = name;
  }

  @Override
  public void emit(final Consumer consumer) {
    consumer.accept(new MetricValue.TotalMetricValue(name, value::get));
  }

  @Override
  public void sample(final long v) {
    value.addAndGet(v);
  }
}