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/*
* Copyright 2017 Async-IO.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
*
* 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.atmosphere.handler;
import org.atmosphere.cpr.ApplicationConfig;
import org.atmosphere.cpr.AtmosphereConfig;
import org.atmosphere.cpr.AtmosphereHandler;
import org.atmosphere.cpr.AtmosphereRequestImpl;
import org.atmosphere.cpr.AtmosphereResource;
import org.atmosphere.cpr.AtmosphereServletProcessor;
import org.atmosphere.cpr.CompletionAware;
import org.atmosphere.util.AtmosphereFilterChain;
import org.atmosphere.util.FilterConfigImpl;
import org.atmosphere.util.IOUtils;
import com.vaadin.external.org.slf4j.Logger;
import com.vaadin.external.org.slf4j.LoggerFactory;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Collection;
import java.util.ArrayList;
import java.util.Map;
/**
* An implementation of {@link AtmosphereHandler} using the {@link AtmosphereServletProcessor} that delegate the {@link AtmosphereHandler#onRequest}
* to a set of {@link FilterChain} and {@link Servlet#service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)}
* and store the {@link AtmosphereResource} as a {@link AtmosphereRequestImpl#getAttribute(String)} attribute named
* {@link org.atmosphere.cpr.FrameworkConfig#ATMOSPHERE_RESOURCE}. The {@link AtmosphereResource} can later be retrieved
* and used to suspend/resume and broadcast.
*
* @author Jeanfrancois Arcand
*/
public class ReflectorServletProcessor extends AbstractReflectorAtmosphereHandler {
private static final long serialVersionUID = 7526472295622776148L;
private final static String APPLICATION_NAME = "applicationClassName";
private static final Logger logger = LoggerFactory.getLogger(ReflectorServletProcessor.class);
private String servletClassName;
private final HashMap filtersClassAndNames = new HashMap();
private final Collection filters = new ArrayList();
private final FilterChainServletWrapper wrapper = new FilterChainServletWrapper();
private final AtmosphereFilterChain filterChain = new AtmosphereFilterChain();
private Servlet servlet;
private AtmosphereConfig config;
public ReflectorServletProcessor() {
}
public ReflectorServletProcessor(Servlet servlet) {
this.servlet = servlet;
}
void loadWebApplication(ServletConfig sc) throws Exception {
URL url = sc.getServletContext().getResource("/WEB-INF/lib/");
URLClassLoader urlC = new URLClassLoader(new URL[]{url},
Thread.currentThread().getContextClassLoader());
loadServlet(sc, urlC);
if (!filters.isEmpty()) {
loadFilterInstances(sc);
} else {
loadFilterClasses(sc, urlC);
}
}
private void loadServlet(ServletConfig sc, URLClassLoader urlC) throws Exception {
if (servletClassName != null && servlet == null) {
try {
servlet = config.framework().newClassInstance(Servlet.class, (Class) urlC.loadClass(servletClassName));
} catch (NullPointerException ex) {
// We failed to load the servlet, let's try directly.
servlet = config.framework().newClassInstance(Servlet.class,
(Class) IOUtils.loadClass(getClass(), servletClassName));
}
}
if (servlet != null) {
logger.info("Installing Servlet {}", servletClassName == null ? servlet.getClass().getName() : servletClassName);
} else {
logger.info("No servlet installed. Neither servlet nor servletClassName is set");
}
}
private void loadFilterClasses(ServletConfig sc, URLClassLoader urlC) throws Exception {
for (Map.Entry fClassAndName : filtersClassAndNames.entrySet()) {
String fClass = fClassAndName.getKey();
String filterName = fClassAndName.getValue();
Filter f = loadFilter(urlC, fClass);
if (filterName == null) {
if (sc.getInitParameter(APPLICATION_NAME) != null) {
filterName = sc.getInitParameter(APPLICATION_NAME);
} else {
filterName = f.getClass().getSimpleName();
}
}
FilterConfigImpl fc = new FilterConfigImpl(sc);
fc.setFilter(f);
fc.setFilterName(filterName);
filterChain.addFilter(fc);
logger.info("Installing Filter {}", filterName);
}
}
private Filter loadFilter(URLClassLoader urlC, String fClass) throws Exception {
Filter f;
try {
f = config.framework().newClassInstance(Filter.class, (Class) urlC.loadClass(fClass));
} catch (NullPointerException ex) {
// We failed to load the Filter, let's try directly.
f = config.framework().newClassInstance(Filter.class, (Class) IOUtils.loadClass(getClass(), fClass));
}
return f;
}
private void loadFilterInstances(ServletConfig sc) {
for (Filter f : filters) {
FilterConfigImpl fc = new FilterConfigImpl(sc);
fc.setFilter(f);
fc.setFilterName(f.getClass().getSimpleName());
filterChain.addFilter(fc);
logger.info("Installing Filter {}", f.getClass().getSimpleName());
}
}
/**
* Delegate the request to the Servlet.service method, and add the {@link AtmosphereResource}
* to the {@link HttpServletRequest#setAttribute(java.lang.String, java.lang.Object))}.
* The {@link AtmosphereResource} can ve retrieved using {@link org.atmosphere.cpr.FrameworkConfig#ATMOSPHERE_RESOURCE}
* value.
*
* @param r The {@link AtmosphereResource}
* @throws java.io.IOException
*/
public void onRequest(AtmosphereResource r)
throws IOException {
final boolean completionAware =
Boolean.parseBoolean(r.getAtmosphereConfig().getInitParameter(ApplicationConfig.RESPONSE_COMPLETION_AWARE));
try {
if (completionAware) {
r.getRequest().setAttribute(ApplicationConfig.RESPONSE_COMPLETION_AWARE, Boolean.TRUE);
if (Boolean.parseBoolean(r.getAtmosphereConfig().getInitParameter(ApplicationConfig.RESPONSE_COMPLETION_RESET))) {
r.getRequest().setAttribute(ApplicationConfig.RESPONSE_COMPLETION_RESET, Boolean.TRUE);
}
}
wrapper.service(r.getRequest(), r.getResponse());
} catch (Throwable ex) {
logger.error("onRequest()", ex);
throw new RuntimeException(ex);
} finally {
// For the sync case, the completion is notified here. For the async case, it is notified by AsyncContext later
if (completionAware && r.getResponse() instanceof CompletionAware && !r.getRequest().isAsyncStarted()) {
((CompletionAware)r.getResponse()).onComplete();
}
}
}
@Override
public void init(AtmosphereConfig config) throws ServletException {
this.config = config;
try {
loadWebApplication(config.getServletConfig());
} catch (Exception ex) {
throw new ServletException(ex);
}
filterChain.setServlet(config.getServletConfig(), servlet);
wrapper.init(config.getServletConfig());
}
public void addFilter(Filter filter) {
filters.add(filter);
}
@Override
public void destroy() {
filterChain.destroy();
}
/**
* Set the Servlet class.
*
* @return the servletClass
* @deprecated - use getServletClassName
*/
@Deprecated
public String getServletClass() {
return servletClassName;
}
/**
* Return the Servlet class name.
*
* @param servletClass the servletClass to set
* @deprecated - use setServletClassName
*/
@Deprecated
public void setServletClass(String servletClass) {
this.servletClassName = servletClass;
}
/**
* Set the Servlet class.
*
* @return the servletClass
*/
public String getServletClassName() {
return servletClassName;
}
/**
* Return the Servlet class name.
*
* @param servletClass the servletClass to set
*/
public void setServletClassName(String servletClass) {
this.servletClassName = servletClass;
}
/**
* Add a FilterClass. Since we are using Reflection to call this method,
* what we are really doing is addFilterClass.
*
*
* @param filterClass
*/
public void setFilterClassName(String filterClass) {
if (filterClass == null) return;
filtersClassAndNames.put(filterClass, filterClass);
}
/**
* Add a FilterClass. Since we are using Reflection to call this method,
* what we are really doing is addFilterClass.
*
* @param filterClass class name of the filter to instantiate.
* @param filterName mapping name of the filter to instantiate
*/
public void addFilterClassName(String filterClass, String filterName) {
if (filterClass == null || filterName == null) return;
filtersClassAndNames.put(filterClass, filterName);
}
public Servlet getServlet() {
return servlet;
}
public void setServlet(Servlet servlet) {
this.servlet = servlet;
}
/**
* Simple wrapper around a {@link Servlet}
*/
private class FilterChainServletWrapper extends HttpServlet {
@Override
public void destroy() {
filterChain.destroy();
}
@Override
public String getInitParameter(String name) {
return getServletConfig().getInitParameter(name);
}
@Override
public Enumeration getInitParameterNames() {
return getServletConfig().getInitParameterNames();
}
@Override
public ServletConfig getServletConfig() {
return filterChain.getServletConfig();
}
@Override
public ServletContext getServletContext() {
return getServletConfig().getServletContext();
}
@Override
public String getServletInfo() {
return filterChain.getServlet().getServletInfo();
}
@Override
public void init(ServletConfig sc) throws ServletException {
filterChain.init();
}
@Override
public void init() throws ServletException {
}
@Override
public void log(String msg) {
getServletContext().log(getServletName() + ": " + msg);
}
@Override
public void log(String message, Throwable t) {
getServletContext().log(getServletName() + ": " + message, t);
}
@Override
public void service(ServletRequest req, ServletResponse res)
throws ServletException, IOException {
filterChain.invokeFilterChain(req, res);
}
@Override
public String getServletName() {
return filterChain.getServletConfig().getServletName();
}
}
@Override
public String toString() {
return getClass().getSimpleName();
}
}
