/*
    * Copyright 2006-2007 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
    *
    *      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.springframework.batch.sample.jmx;
  
  import org.aspectj.lang.JoinPoint;
  import org.springframework.batch.core.StepExecution;
  import org.springframework.context.ApplicationEvent;
  import org.springframework.context.ApplicationEventPublisher;
  import org.springframework.context.ApplicationEventPublisherAware;
  
  /**
   * Wraps calls for methods taking {@link StepExecution} as an argument and
   * publishes notifications in the form of {@link ApplicationEvent}.
   * 
   * @author Dave Syer
   */
  public class StepExecutionApplicationEventAdvice implements ApplicationEventPublisherAware {
  
  	private ApplicationEventPublisher applicationEventPublisher;
  
  	/*
  	 * (non-Javadoc)
  	 * @see org.springframework.context.ApplicationEventPublisherAware#setApplicationEventPublisher(org.springframework.context.ApplicationEventPublisher)
  	 */
  	public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
  		this.applicationEventPublisher = applicationEventPublisher;
  	}
  
  	public void before(JoinPoint jp, StepExecution stepExecution) {
  		String msg = "Before: " + jp.toShortString() + " with: " + stepExecution;
  		publish(jp.getTarget(), msg);
  	}
  
  	public void after(JoinPoint jp, StepExecution stepExecution) {
  		String msg = "After: " + jp.toShortString() + " with: " + stepExecution;
  		publish(jp.getTarget(), msg);
  	}
  
  	public void onError(JoinPoint jp, StepExecution stepExecution, Throwable t) {
  		String msg = "Error in: " + jp.toShortString() + " with: " + stepExecution + " (" + t.getClass() + ":" + t.getMessage() + ")";
  		publish(jp.getTarget(), msg);
  	}
  
  	/*
  	 * Publish a {@link SimpleMessageApplicationEvent} with the given
  	 * parameters.
  	 */
  	private void publish(Object source, String message) {
  		applicationEventPublisher.publishEvent(new SimpleMessageApplicationEvent(source, message));
  	}
  
  }