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Reactor Kafka: A reactive API for Apache Kafka
There is a newer version: 1.3.23
/*
 * Copyright (c) 2022-2023 VMware Inc. or its affiliates, 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
 *
 *   https://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 reactor.kafka.sender;

import io.micrometer.core.instrument.ImmutableTag;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import io.micrometer.core.instrument.binder.kafka.KafkaClientMetrics;
import org.apache.kafka.clients.producer.Producer;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * A producer listener that manages {@link KafkaClientMetrics}.
 *
 * @author Gary Russell
 * @since 1.3.17
 *
 */
public class MicrometerProducerListener implements SenderOptions.ProducerListener {

    private final MeterRegistry meterRegistry;

    private final List tags;

    private final Map metrics = new HashMap<>();

    /**
     * Construct an instance with the provided registry.
     * @param meterRegistry the registry.
     */
    public MicrometerProducerListener(MeterRegistry meterRegistry) {
        this(meterRegistry, Collections.emptyList());
    }

    /**
     * Construct an instance with the provided registry and tags.
     * @param meterRegistry the registry.
     * @param tags the tags.
     */
    public MicrometerProducerListener(MeterRegistry meterRegistry, List tags) {
        this.meterRegistry = meterRegistry;
        this.tags = tags;
    }


    @Override
    public synchronized void producerAdded(String id, Producer producer) {
        if (!this.metrics.containsKey(id)) {
            List producerTags = new ArrayList<>(this.tags);
            producerTags.add(new ImmutableTag("reactor-kafka.id", id));
            this.metrics.put(id, new KafkaClientMetrics(producer, producerTags));
            this.metrics.get(id).bindTo(this.meterRegistry);
        }
    }

    @Override
    public synchronized void producerRemoved(String id, Producer producer) {
        KafkaClientMetrics removed = this.metrics.remove(id);
        if (removed != null) {
            removed.close();
        }
    }

}