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Kafka client whose producer requires explicit encoders.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.kafka.common.metrics;

import org.apache.kafka.common.Metric;
import org.apache.kafka.common.MetricName;
import org.apache.kafka.common.utils.Time;

public final class KafkaMetric implements Metric {

    private MetricName metricName;
    private final Object lock;
    private final Time time;
    private final Measurable measurable;
    private MetricConfig config;

    KafkaMetric(Object lock, MetricName metricName, Measurable measurable, MetricConfig config, Time time) {
        super();
        this.metricName = metricName;
        this.lock = lock;
        this.measurable = measurable;
        this.config = config;
        this.time = time;
    }

    MetricConfig config() {
        return this.config;
    }

    @Override
    public MetricName metricName() {
        return this.metricName;
    }

    @Override
    public double value() {
        synchronized (this.lock) {
            return value(time.milliseconds());
        }
    }

    double value(long timeMs) {
        return this.measurable.measure(config, timeMs);
    }

    public void config(MetricConfig config) {
        synchronized (lock) {
            this.config = config;
        }
    }
}