/**
* Copyright 2016 LinkedIn Corp. 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.
*/
package com.github.ambry.metrics;
/**
* A metric visitor visits a metric, before metrics are flushed to a metrics stream.
* The metric visitor visits the metric and registers it to its list of metrics that
* it has visited. A visitor should only visit a metric once for the lifetime of the
* metric.
*/
public abstract class MetricsVisitor {
public abstract void counter(Counter counter);
public abstract <T> void gauge(Gauge<T> gauge);
/**
* Visits the specified metric.
* @param metric The metric to visit
*/
public void visit(Metric metric) {
if (metric instanceof Counter) {
counter((Counter) metric);
} else if (metric instanceof Gauge<?>) {
gauge((Gauge<?>) metric);
}
}
}