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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.concurrent.TimeUnit;
import org.apache.bookkeeper.stats.Counter;
import org.apache.bookkeeper.stats.Gauge;
import org.apache.bookkeeper.stats.OpStatsData;
import org.apache.bookkeeper.stats.OpStatsLogger;

/**
 * A no-op {@code StatsLogger}.
 *
 * Metrics are not recorded, making this receiver useful in unit tests and as defaults in
 * situations where metrics are not strictly required.
 */
public class NullStatsLogger implements StatsLogger {

    public static final NullStatsLogger INSTANCE = new NullStatsLogger();

    /**
     * A no-op {@code OpStatsLogger}.
     */
    static class NullOpStatsLogger implements OpStatsLogger {
        private final OpStatsData nullOpStats =
                new OpStatsData(0, 0, 0, new long[6]);

        @Override
        public void registerFailedEvent(long eventLatency, TimeUnit unit) {
            // nop
        }

        @Override
        public void registerSuccessfulEvent(long eventLatency, TimeUnit unit) {
            // nop
        }

        @Override
        public void registerSuccessfulValue(long value) {
            // nop
        }

        @Override
        public void registerFailedValue(long value) {
            // nop
        }

        @Override
        public OpStatsData toOpStatsData() {
            return nullOpStats;
        }

        @Override
        public void clear() {
            // nop
        }
    }
    private static final NullOpStatsLogger nullOpStatsLogger = new NullOpStatsLogger();

    /**
     * A no-op {@code Counter}.
     */
    static class NullCounter implements Counter {
        @Override
        public void clear() {
            // nop
        }

        @Override
        public void inc() {
            // nop
        }

        @Override
        public void dec() {
            // nop
        }

        @Override
        public void addCount(long delta) {
            // nop
        }

        @Override
        public void addLatency(long l, TimeUnit timeUnit) {
            // nop
        }

        @Override
        public Long get() {
            return 0L;
        }
    }
    private static final NullCounter nullCounter = new NullStatsLogger.NullCounter();

    @Override
    public OpStatsLogger getOpStatsLogger(String name) {
        return nullOpStatsLogger;
    }

    @Override
    public Counter getCounter(String name) {
        return nullCounter;
    }

    @Override
    public  void registerGauge(String name, Gauge gauge) {
        // nop
    }

    @Override
    public  void unregisterGauge(String name, Gauge gauge) {
        // nop
    }

    @Override
    public StatsLogger scope(String name) {
        return this;
    }

    @Override
    public void removeScope(String name, StatsLogger statsLogger) {
        // nop
    }
}