/*
* Copyright 2012 astamuse company,Ltd.
*
* 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 com.astamuse.asta4d.web.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.astamuse.asta4d.Configuration;
import com.astamuse.asta4d.Context;
import com.astamuse.asta4d.web.WebApplicationConfiguration;
import com.astamuse.asta4d.web.WebApplicationContext;
import com.astamuse.asta4d.web.dispatch.RequestDispatcher;
import com.astamuse.asta4d.web.dispatch.mapping.UrlMappingRule;
import com.astamuse.asta4d.web.dispatch.mapping.ext.UrlMappingRuleHelper;
/**
* Here we are going to implement a view first mechanism of view resolving. We
* need a url mapping algorithm too.
*
*/
public class Asta4dServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
private final static Logger logger = LoggerFactory.getLogger(Asta4dServlet.class);
protected RequestDispatcher dispatcher = new RequestDispatcher();
private List<UrlMappingRule> ruleList;
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
Configuration.setConfiguration(createConfiguration());
ruleList = createRuleList();
}
private List<UrlMappingRule> createRuleList() {
UrlMappingRuleHelper helper = new UrlMappingRuleHelper();
WebApplicationConfiguration conf = WebApplicationConfiguration.getWebApplicationConfiguration();
conf.getUrlMappingRuleInitializer().initUrlMappingRules(helper);
logger.info("url mapping rules are initialized.");
return helper.getArrangedRuleList();
}
@Override
protected final void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
logger.debug("access for:{}", req.getRequestURI());
WebApplicationContext context = null;
try {
context = Context.getCurrentThreadContext();
if (context == null) {
context = createAsta4dContext();
Context.setCurrentThreadContext(context);
}
context.setRequest(req);
context.setResponse(res);
context.setServletContext(getServletContext());
service();
} catch (Exception e) {
throw new ServletException(e);
} finally {
if (context != null) {
context.clear();
}
}
}
/**
* Subclass can override this method to do something before or after real
* service process.
*
* eg. {@link WebApplicationContext#setAccessURI(String)} can be called
* before this method to rewrite access uri.
*
* @throws Exception
*/
protected void service() throws Exception {
if (Configuration.getConfiguration().isCacheEnable()) {
dispatcher.dispatchAndProcess(ruleList);
} else {
dispatcher.dispatchAndProcess(createRuleList());
}
}
protected WebApplicationContext createAsta4dContext() {
WebApplicationContext context = new WebApplicationContext();
return context;
}
protected WebApplicationConfiguration createConfiguration() {
return new WebApplicationConfiguration();
}
}