content: /*
   * Copyright 2019-2019 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 app.main;
  
  import java.lang.reflect.Method;
  import java.util.LinkedHashSet;
  import java.util.Set;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import org.springframework.beans.BeansException;
  import org.springframework.boot.SpringApplication;
  import org.springframework.boot.SpringBootConfiguration;
  import org.springframework.boot.context.event.ApplicationReadyEvent;
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.ApplicationContextAware;
  import org.springframework.context.ApplicationListener;
  import org.springframework.core.annotation.AnnotatedElementUtils;
  import org.springframework.util.ClassUtils;
  import org.springframework.util.ReflectionUtils;
  
  public class StartupApplicationListener
          implements ApplicationListener<ApplicationReadyEvent>, ApplicationContextAware {
  
      public static final String MARKER = "Benchmark app started";
      private static Log logger = LogFactory.getLog(StartupApplicationListener.class);
      private ApplicationContext context;
  
      @Override
      public void setApplicationContext(ApplicationContext context) throws BeansException {
          this.context = context;
      }
  
      @Override
      public void onApplicationEvent(ApplicationReadyEvent event) {
          if (!event.getApplicationContext().equals(this.context)) {
              return;
          }
          if (isSpringBootApplication(sources(event))) {
              try {
                  logger.info(MARKER);
              }
              catch (Exception e) {
              }
          }
      }
  
      private boolean isSpringBootApplication(Set<Class<?>> sources) {
          for (Class<?> source : sources) {
              if (AnnotatedElementUtils.hasAnnotation(source,
                      SpringBootConfiguration.class)) {
                  return true;
              }
          }
          return false;
      }
  
      private Set<Class<?>> sources(ApplicationReadyEvent event) {
          Method method = ReflectionUtils.findMethod(SpringApplication.class,
                  "getAllSources");
          if (method == null) {
              method = ReflectionUtils.findMethod(SpringApplication.class, "getSources");
          }
          ReflectionUtils.makeAccessible(method);
          @SuppressWarnings("unchecked")
          Set<Object> objects = (Set<Object>) ReflectionUtils.invokeMethod(method,
                  event.getSpringApplication());
          Set<Class<?>> result = new LinkedHashSet<>();
          for (Object object : objects) {
              if (object instanceof String) {
                  object = ClassUtils.resolveClassName((String) object, null);
              }
              result.add((Class<?>) object);
          }
          return result;
      }
  
  }