org.apache.kafka.common.metrics.Gauge Maven / Gradle / Ivy
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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,
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* See the License for the specific language governing permissions and
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*/
package org.apache.kafka.common.metrics;
/**
* A gauge metric is an instantaneous reading of a particular value.
*/
@FunctionalInterface
public interface Gauge extends MetricValueProvider {
/**
* Returns the current value associated with this gauge.
* @param config The configuration for this metric
* @param now The POSIX time in milliseconds the measurement is being taken
*/
T value(MetricConfig config, long now);
}