org.springframework.boot.actuate.metrics.web.tomcat.TomcatMetricsBinder Maven / Gradle / Ivy
/*
* Copyright 2012-2018 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.actuate.metrics.web.tomcat;
import java.util.Collections;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import io.micrometer.core.instrument.binder.tomcat.TomcatMetrics;
import org.apache.catalina.Container;
import org.apache.catalina.Context;
import org.apache.catalina.Manager;
import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.boot.web.context.WebServerApplicationContext;
import org.springframework.boot.web.embedded.tomcat.TomcatWebServer;
import org.springframework.boot.web.server.WebServer;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationListener;
/**
* Binds {@link TomcatMetrics} in response to the {@link ApplicationStartedEvent}.
*
* @author Andy Wilkinson
* @since 2.1.0
*/
public class TomcatMetricsBinder implements ApplicationListener {
private final MeterRegistry meterRegistry;
private final Iterable tags;
public TomcatMetricsBinder(MeterRegistry meterRegistry) {
this(meterRegistry, Collections.emptyList());
}
public TomcatMetricsBinder(MeterRegistry meterRegistry, Iterable tags) {
this.meterRegistry = meterRegistry;
this.tags = tags;
}
@Override
public void onApplicationEvent(ApplicationStartedEvent event) {
ApplicationContext applicationContext = event.getApplicationContext();
Manager manager = findManager(applicationContext);
new TomcatMetrics(manager, this.tags).bindTo(this.meterRegistry);
}
private Manager findManager(ApplicationContext applicationContext) {
if (applicationContext instanceof WebServerApplicationContext) {
WebServer webServer = ((WebServerApplicationContext) applicationContext)
.getWebServer();
if (webServer instanceof TomcatWebServer) {
Context context = findContext((TomcatWebServer) webServer);
return context.getManager();
}
}
return null;
}
private Context findContext(TomcatWebServer tomcatWebServer) {
for (Container container : tomcatWebServer.getTomcat().getHost().findChildren()) {
if (container instanceof Context) {
return (Context) container;
}
}
return null;
}
}