/*
* Copyright 2013 NGDATA nv
*
* 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.lilyproject.servlet.springmvc;
import javax.annotation.PostConstruct;
import javax.servlet.Servlet;
import javax.servlet.ServletContext;
import java.util.Collections;
import java.util.EventListener;
import java.util.List;
import org.lilyproject.runtime.rapi.LilyRuntimeModule;
import org.lilyproject.servletregistry.api.ServletRegistry;
import org.lilyproject.servletregistry.api.ServletRegistryEntry;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.context.ApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.web.context.support.GenericWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;
/**
* This class is part of the mvc project because it is mvc specific. It creates a spring mvc dispatcher servlet
* which has the lily runtime spring app context as parent app context and registers this servlet with the container.
*/
public class DispatcherServletManager {
@Autowired
private LilyRuntimeModule module;
@Autowired
private ServletRegistry servletRegistry;
private List<String> urlPatterns = Collections.emptyList();
private final String springMvcApplicationContextLocation;
public DispatcherServletManager(String springMvcApplicationContextLocation) {
this.springMvcApplicationContextLocation = springMvcApplicationContextLocation;
}
@PostConstruct
public void createAndRegisterDispatcherServletInContainer() {
final ApplicationContext existingLilyRuntimeSpringContext = module.getSpringContext();
servletRegistry.addEntry(new ServletRegistryEntry() {
@Override
public List<String> getUrlPatterns() {
return urlPatterns;
}
@Override
public Servlet getServletInstance(ServletContext context) {
ClassLoader orig = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(module.getClassLoader());
try {
final GenericWebApplicationContext mvcContext = new GenericWebApplicationContext(context);
mvcContext.setClassLoader(module.getClassLoader());
mvcContext.setServletContext(context);
XmlBeanDefinitionReader xmlReader = new XmlBeanDefinitionReader(mvcContext);
xmlReader.setBeanClassLoader(module.getClassLoader());
xmlReader.loadBeanDefinitions(new ClassPathResource(springMvcApplicationContextLocation,
module.getClassLoader()));
mvcContext.setParent(existingLilyRuntimeSpringContext);
mvcContext.refresh();
DispatcherServlet dispatcherServlet = new DispatcherServlet(mvcContext);
dispatcherServlet.setDetectAllHandlerMappings(true);
return dispatcherServlet;
} finally {
Thread.currentThread().setContextClassLoader(orig);
}
}
@Override
public List<EventListener> getEventListeners() {
return Collections.emptyList();
}
});
}
public void setUrlPatterns(List<String> urlPatterns) {
this.urlPatterns = urlPatterns;
}
}