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Kafka on Pulsar implemented using Pulsar Protocol Handler

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/**
 * 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 io.streamnative.pulsar.handlers.kop.stats;

import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.LongAdder;
import org.apache.bookkeeper.stats.Counter;

/**
 * {@link Counter} implementation based on {@link LongAdder}.
 *
 * LongAdder keeps a counter per-thread and then aggregates to get the result, in order to avoid contention between
 * multiple threads.
 */
public class LongAdderCounter implements Counter {
    private final LongAdder counter = new LongAdder();

    private final Map labels;

    public LongAdderCounter(Map labels) {
        this.labels = labels;
    }

    @Override
    public void clear() {
        counter.reset();
    }

    @Override
    public void inc() {
        counter.increment();
    }

    @Override
    public void dec() {
        counter.decrement();
    }

    @Override
    public void addCount(long delta) {
        counter.add(delta);
    }

    @Override
    public void addLatency(long l, TimeUnit timeUnit) {
        // No-op
    }

    @Override
    public Long get() {
        return counter.sum();
    }

    public Map getLabels() {
        return labels;
    }
}