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Kafka on Pulsar implemented using Pulsar Protocol Handler

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/**
 * Copyright (c) 2019 - 2024 StreamNative, Inc.. All Rights Reserved.
 */
/**
 * 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.annotations.VisibleForTesting;
import com.yahoo.sketches.quantiles.DoublesUnion;
import io.netty.util.concurrent.FastThreadLocal;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

public class ThreadLocalAccessor {
    private final Map map = new ConcurrentHashMap<>();
    private final FastThreadLocal localData = new FastThreadLocal<>() {

        @Override
        protected LocalData initialValue() {
            LocalData localData = new LocalData(Thread.currentThread());
            map.put(localData, Boolean.TRUE);
            return localData;
        }

        @Override
        protected void onRemoval(LocalData value) {
            map.remove(value);
        }
    };

    public void record(DoublesUnion aggregateSuccess, DoublesUnion aggregateFail) {
        map.keySet().forEach(key -> {
            key.record(aggregateSuccess, aggregateFail);
            if (key.shouldRemove()) {
                map.remove(key);
            }
        });
    }

    public LocalData getLocalData() {
        return localData.get();
    }

    @VisibleForTesting
    Set getLocalDataSet() {
        return map.keySet();
    }
}