/*
    * Copyright (C) 2012-2024 RRiBbit.org
    *
    * 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.rribbit.processing;
  
  import org.rribbit.execution.ListenerObjectExecutor;
  import org.rribbit.retrieval.ListenerObjectRetriever;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.context.ApplicationContext;
  import org.springframework.web.context.WebApplicationContext;
  import org.springframework.web.context.support.WebApplicationContextUtils;
  
  /**
   * This implementation of {@link HttpRequestProcessorServlet} tries to retrieve a {@link ListenerObjectRetriever} and a {@link ListenerObjectExecutor} from the
   * Spring {@link WebApplicationContext}, if one is available. Use this class if you use Spring in combination with RRiBbit HTTP remoting. Then, you only have to wire up a
   * {@link ListenerObjectRetriever} and a {@link ListenerObjectExecutor} in your {@link ApplicationContext} and declare this class in your web.xml and the server side is done.
   *
   * @author G.J. Schouten
   *
   */
  public class SpringHttpRequestProcessorServlet extends HttpRequestProcessorServlet {
  
  	private static final Logger log = LoggerFactory.getLogger(SpringHttpRequestProcessorServlet.class);
  
  	protected ListenerObjectRetriever listenerObjectRetriever;
  	protected ListenerObjectExecutor listenerObjectExecutor;
  
  	@Override
  	protected ListenerObjectRetriever createListenerObjectRetriever() {
  		return listenerObjectRetriever;
  	}
  
  	@Override
  	protected ListenerObjectExecutor createListenerObjectExecutor() {
  		return listenerObjectExecutor;
  	}
  
  	@Override
  	public void init() {
  
  		log.info("Retrieving WebApplicationContext from ServletContext and getting ListenerObjectRetriever and ListenerObjectExecutor");
  
  		//First, retrieve the WebApplicationContext via the Servlet Container and get the ListenerObjectRetriever and ListenerObjectExecutor
  		WebApplicationContext ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(this.getServletContext());
  		listenerObjectRetriever = ctx.getBean(ListenerObjectRetriever.class);
  		listenerObjectExecutor = ctx.getBean(ListenerObjectExecutor.class);
  
  		//Then call super, which in turn calls the createListenerObjectRetriever() and createListenerObjectExecutor() methods
  		super.init();
  	}
  }