content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.camel.component.platform.http.springboot.actuate.metrics.undertow;
  
  import io.micrometer.core.instrument.MeterRegistry;
  import io.micrometer.core.instrument.Tag;
  import io.undertow.Undertow;
  import io.undertow.servlet.api.DeploymentManager;
  import org.springframework.beans.factory.DisposableBean;
  import org.springframework.boot.context.event.ApplicationStartedEvent;
  import org.springframework.boot.web.context.WebServerApplicationContext;
  import org.springframework.boot.web.embedded.undertow.UndertowServletWebServer;
  import org.springframework.boot.web.server.WebServer;
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.ApplicationListener;
  import org.xnio.XnioWorker;
  
  import java.util.Collections;
  
  public class UndertowMetricsBinder implements ApplicationListener<ApplicationStartedEvent>, DisposableBean {
  
      private final MeterRegistry meterRegistry;
      private final Iterable<Tag> tags;
      private volatile UndertowMetrics undertowMetrics;
  
      public UndertowMetricsBinder(MeterRegistry meterRegistry) {
          this(meterRegistry, Collections.emptyList());
      }
  
      public UndertowMetricsBinder(MeterRegistry meterRegistry, Iterable<Tag> tags) {
          this.meterRegistry = meterRegistry;
          this.tags = tags;
      }
  
      @Override
      public void destroy() {
          if (this.undertowMetrics != null) {
              this.undertowMetrics.close();
          }
      }
  
      @Override
      public void onApplicationEvent(ApplicationStartedEvent event) {
          ApplicationContext applicationContext = event.getApplicationContext();
          UndertowComponents undertowComponents = findUndertowComponents(applicationContext);
          if (undertowComponents != null) {
              this.undertowMetrics = new UndertowMetrics(undertowComponents.xnioWorker(), undertowComponents.sessionManager(),
                      undertowComponents.deployment(), tags);
              this.undertowMetrics.bindTo(this.meterRegistry);
          }
      }
  
      private UndertowComponents findUndertowComponents(ApplicationContext applicationContext) {
          if (applicationContext instanceof WebServerApplicationContext webServerApplicationContext) {
              WebServer webServer = webServerApplicationContext.getWebServer();
              if (webServer instanceof UndertowServletWebServer undertowServletWebServer) {
                  Undertow undertow = undertowServletWebServer.getUndertow();
                  XnioWorker xnioWorker = undertowServletWebServer.getUndertow().getWorker();
                  DeploymentManager deploymentManager = undertowServletWebServer.getDeploymentManager();
  
                  return new UndertowComponents(
                          xnioWorker,
                          deploymentManager.getDeployment().getSessionManager(),
                          deploymentManager.getDeployment(),
                          undertow
                  );
              }
          }
          return null;
      }
  
  }
  