kafka Gauge 源码
kafka Gauge 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/metrics/Gauge.java
/*
* 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;
/**
* A gauge metric is an instantaneous reading of a particular value.
*/
@FunctionalInterface
public interface Gauge<T> extends MetricValueProvider<T> {
/**
* 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);
}
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