001/*
002 * Copyright 2012-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.boot.docs.actuate.metrics;
018
019import java.util.List;
020import java.util.concurrent.CopyOnWriteArrayList;
021
022import io.micrometer.core.instrument.MeterRegistry;
023import io.micrometer.core.instrument.Tags;
024
025/**
026 * Example to show injection and use of a {@link MeterRegistry}.
027 *
028 * @author Andy Wilkinson
029 */
030public class MetricsMeterRegistryInjectionExample {
031
032        // tag::component[]
033        class Dictionary {
034
035                private final List<String> words = new CopyOnWriteArrayList<>();
036
037                Dictionary(MeterRegistry registry) {
038                        registry.gaugeCollectionSize("dictionary.size", Tags.empty(), this.words);
039                }
040
041                // …
042
043        }
044        // end::component[]
045
046}