/*
* Copyright 2010 Google Inc.
*
* 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.google.jstestdriver.requesthandlers;
import com.google.inject.Inject;
import com.google.inject.OutOfScopeException;
import com.google.inject.Provider;
import java.io.IOException;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* The lone {@link Servlet}, a @Singleton. Sets up the {@link RequestScope} and
* instantiates a @RequestScoped {@link RequestDispatcher} to dispatch the
* request.
*
* @author rdionne@google.com (Robert Dionne)
*/
class RequestHandlerServlet extends HttpServlet {
private static final long serialVersionUID = -186242854065156745L;
private static ThreadLocal<Context> localContext = new ThreadLocal<Context>();
private final RequestScope requestScope;
private final Provider<RequestDispatcher> dispatcherProvider;
@Inject
public RequestHandlerServlet(
RequestScope requestScope,
Provider<RequestDispatcher> dispatcherProvider) {
this.requestScope = requestScope;
this.dispatcherProvider = dispatcherProvider;
}
@Override
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO(rdionne): Wrap request in an HttpServletRequestWrapper that corrects
// #getPathInfo() before we clean up JsTestDriverServer.
localContext.set(new Context(request, response));
requestScope.enter();
try {
requestScope.seed(HttpServletRequest.class, request);
requestScope.seed(HttpServletResponse.class, response);
dispatcherProvider.get().dispatch();
} finally {
localContext.remove();
requestScope.exit();
}
}
static HttpServletRequest getRequest() {
return getContext().request;
}
static HttpServletResponse getResponse() {
return getContext().response;
}
private static Context getContext() {
Context context = localContext.get();
if (context == null) {
throw new OutOfScopeException("Cannot access scoped object.");
}
return context;
}
private static class Context {
HttpServletRequest request;
HttpServletResponse response;
public Context(HttpServletRequest request, HttpServletResponse response) {
this.request = request;
this.response = response;
}
}
}