/*
 * Copyright 2012-2020 the original author or authors.
 *
 * 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 org.springframework.boot.docs.actuate.metrics;

import io.micrometer.core.instrument.Gauge;
import io.micrometer.core.instrument.binder.MeterBinder;

import org.springframework.context.annotation.Bean;

/**
 * Example to show configuration of a custom {@link MeterBinder}.
 *
 * @author Andy Wilkinson
 */
public class SampleMeterBinderConfiguration {

	// tag::example[]
	@Bean
	MeterBinder queueSize(Queue queue) {
		return (registry) -> Gauge.builder("queueSize", queue::size).register(registry);
	}
	// end::example[]

	static class Queue {

		int size() {
			return 5;
		}

	}

}
