package com.atlassian.event.internal;
   
   import com.atlassian.event.api.AsynchronousPreferred;
   
   import static com.google.common.base.Preconditions.checkNotNull;
   
   /**
    * <p>Annotation based {@link AsynchronousEventResolver}. This will check whether the event is annotated with the given
    * annotation.</p>
   * <p>The default annotation used is {@link com.atlassian.event.api.AsynchronousPreferred}</p>
   *
   * @see com.atlassian.event.api.AsynchronousPreferred
   * @since 2.0
   */
  public final class AnnotationAsynchronousEventResolver implements AsynchronousEventResolver {
      private final Class annotationClass;
  
      AnnotationAsynchronousEventResolver() {
          this(AsynchronousPreferred.class);
      }
  
      AnnotationAsynchronousEventResolver(Class annotationClass) {
          this.annotationClass = checkNotNull(annotationClass);
      }
  
      @SuppressWarnings("unchecked")
      public boolean isAsynchronousEvent(Object event) {
          return checkNotNull(event).getClass().getAnnotation(annotationClass) != null;
      }
  }