buffaloworker.java

AJAX的一个好东西哦,国人的一个AJAX的实现不错的东西

/*
 * Copyright 2002-2004 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.
 * 
 * $Id$
 */ 
package net.buffalo.service;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import net.buffalo.request.AbstractRequestWorker;
import net.buffalo.request.RequestWorker;
import net.buffalo.request.ValidationException;
import net.buffalo.service.invoker.ServiceInvoker;
import net.buffalo.service.invoker.burlap.BurlapInvoker;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Buffalo worker, deal with the buffalo call
 * 
 * @author michael
 * @version 1.2
 * @since 1.2alpha2
 */
public class BuffaloWorker extends AbstractRequestWorker implements RequestWorker {
	
	private static final Log LOG = LogFactory.getLog(BuffaloWorker.class);
	
	public void processRequest() throws IOException {
		
		LOG.debug("invoking buffalo worker");
		
		String requestService = getWorkerRelativePath();
		
		ServiceRepository repository = ServiceRepositoryUtil.getServiceRepository(requestContext.getContext());
		
		Object service = repository.get(requestService);
		
		// check if the service is buffao service
		if (service instanceof net.buffalo.service.BuffaloService) {
			((net.buffalo.service.BuffaloService)service).init(requestContext);
		} else if (service instanceof net.buffalo.server.BuffaloService) { //will be deprecated
			((net.buffalo.server.BuffaloService)service).init(requestContext.getContext(), requestContext.getRequest());
		}
		
		ServiceInvoker invoker = new BurlapInvoker(service);
		
		InputStream is = requestContext.getRequest().getInputStream();
		OutputStream os = requestContext.getResponse().getOutputStream();
		
		try {
			invoker.invoke(is, os);
		} catch (Throwable ex) {
			throw new ServiceInvocationException("An exception occured when invoke a service",ex);
		}
		
	}
	
	public void validate() throws ValidationException {
		if (!requestContext.getRequest().getMethod().equals("POST")) {
			throw new ValidationException("Buffalo worker support POST only!");
		}
	}

}