001/*
002 * Licensed to DuraSpace under one or more contributor license agreements.
003 * See the NOTICE file distributed with this work for additional information
004 * regarding copyright ownership.
005 *
006 * DuraSpace licenses this file to you under the Apache License,
007 * Version 2.0 (the "License"); you may not use this file except in
008 * compliance with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.fcrepo.http.commons.metrics;
019
020import io.micrometer.core.instrument.MeterRegistry;
021import io.micrometer.jersey2.server.DefaultJerseyTagsProvider;
022import io.micrometer.jersey2.server.MetricsApplicationEventListener;
023import org.springframework.web.context.support.WebApplicationContextUtils;
024
025import javax.servlet.ServletContext;
026import javax.ws.rs.core.Context;
027import javax.ws.rs.core.Feature;
028import javax.ws.rs.core.FeatureContext;
029
030/**
031 * Enables Micrometer metrics on Jersey APIs (still must be annotated with @Timed)
032 *
033 * @author pwinckles
034 */
035public class MicrometerFeature implements Feature {
036
037    @Context
038    private ServletContext servletContext;
039
040    @Override
041    public boolean configure(final FeatureContext context) {
042        if (this.servletContext == null) {
043            return false;
044        }
045        final var appCtx = WebApplicationContextUtils.getWebApplicationContext(servletContext);
046        if (appCtx == null) {
047            return false;
048        }
049
050        final var registry = appCtx.getBean(MeterRegistry.class);
051
052        final var micrometerListener = new MetricsApplicationEventListener(
053                registry,
054                new DefaultJerseyTagsProvider(),
055                "http.server.requests",
056                false);
057
058        context.register(micrometerListener);
059
060        return true;
061    }
062
063}