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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 com.google.common.base.Joiner;
import io.prometheus.client.Collector;
import java.util.Map;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.bookkeeper.stats.Counter;
import org.apache.bookkeeper.stats.Gauge;
import org.apache.bookkeeper.stats.OpStatsLogger;

/**
 * A {@code Prometheus} based {@link StatsLogger} implementation.
 */
public class PrometheusStatsLogger implements StatsLogger {

    private final PrometheusMetricsProvider provider;
    private final String scope;
    private final Map labels;

    private final Map completeNameCache = new ConcurrentHashMap<>();
    private final Map scopeContextCache = new ConcurrentHashMap<>();



    PrometheusStatsLogger(PrometheusMetricsProvider provider, String scope, Map labels) {
        this.provider = provider;
        this.scope = scope;
        this.labels = labels;
    }

    @Override
    public OpStatsLogger getOpStatsLogger(String name) {
        return provider.opStats.computeIfAbsent(scopeContext(name), x -> new DataSketchesOpStatsLogger(labels));
    }

    @Override
    public Counter getCounter(String name) {
        return provider.counters.computeIfAbsent(scopeContext(name), x -> new LongAdderCounter(labels));
    }

    @Override
    public  void registerGauge(String name, Gauge gauge) {
        provider.gauges.computeIfAbsent(scopeContext(name), x -> new SimpleGauge(gauge, labels));
    }

    @Override
    public  void unregisterGauge(String name, Gauge gauge) {
        // no-op
    }

    @Override
    public void removeScope(String name, StatsLogger statsLogger) {
        // no-op
    }

    @Override
    public StatsLogger scope(String name) {
        return new PrometheusStatsLogger(provider, completeName(name), labels);
    }

    @Override
    public StatsLogger scopeLabel(String labelName, String labelValue) {
        Map newLabels = new TreeMap<>(labels);
        newLabels.put(labelName, labelValue);
        return new PrometheusStatsLogger(provider, scope, newLabels);
    }

    private ScopeContext scopeContext(String name) {
        return scopeContextCache.computeIfAbsent(name, __ -> new ScopeContext(completeName(name), labels));
    }

    private String completeName(String name) {
        return completeNameCache.computeIfAbsent(name,
                __ -> Collector.sanitizeMetricName(scope.isEmpty() ? name : Joiner.on('_').join(scope, name)));
    }
}