content::ResourceDispatcherHostImpl changes for stale-while-revalidate

content/browser/loader/resource_dispatcher_host_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the child process (i.e. [Renderer, Plugin, Worker]ProcessHost), and
 // dispatches them to URLRequests. It then forwards the messages from the
 // URLRequests back to the correct process for handling.
 //
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #ifndef CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_
 #define CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
+#include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "content/browser/download/download_resource_handler.h"
@@ skipping 11 matching lines @@
 #include "content/public/browser/resource_dispatcher_host.h"
 #include "content/public/common/resource_type.h"
 #include "ipc/ipc_message.h"
 #include "net/cookies/canonical_cookie.h"
 #include "net/url_request/url_request.h"
 
 class ResourceHandler;
 struct ResourceHostMsg_Request;
 
 namespace net {
+class URLRequestContext;
 class URLRequestJobFactory;
+class HttpCache;
 }
 
 namespace storage {
 class ShareableFileReference;
 }
 
 namespace content {
 class AppCacheService;
 class NavigationURLLoaderImplCore;
 class ResourceContext;
@@ skipping 355 matching lines @@
                                 int route_id,
                                 int request_id,
                                 const ResourceHostMsg_Request& request_data,
                                 const linked_ptr<ResourceLoader>& loader);
 
   void BeginRequest(int request_id,
                     const ResourceHostMsg_Request& request_data,
                     IPC::Message* sync_result,  // only valid for sync
                     int route_id);  // only valid for async
 
+  void BeginRequestFromData(int request_id,
+                            const ResourceHostMsg_Request& request_data,
+                            IPC::Message* sync_result,
+                            int process_type,
+                            int child_id,
+                            int route_id,
+                            bool is_async_revalidation,
+                            net::URLRequestContext* request_context,
+                            ResourceContext* resource_context);
+
   // Creates a ResourceHandler to be used by BeginRequest() for normal resource
   // loading.
   scoped_ptr<ResourceHandler> CreateResourceHandler(
       net::URLRequest* request,
       const ResourceHostMsg_Request& request_data,
       IPC::Message* sync_result,
       int route_id,
       int process_type,
       int child_id,
+      bool is_async_revalidation,
       ResourceContext* resource_context);
 
+  // Wraps |handler| in the BufferedResourceHandler, enabling mime-type sniffing
+  // and redirecting to download or plugins as appropriate.
+  scoped_ptr<ResourceHandler> AddBufferedResourceHandler(
+      net::URLRequest* request,
+      scoped_ptr<ResourceHandler> handler);
+
   // Wraps |handler| in the standard resource handlers for normal resource
-  // loading and navigation requests. This adds BufferedResourceHandler and
-  // ResourceThrottles.
-  scoped_ptr<ResourceHandler> AddStandardHandlers(
+  // loading and navigation requests. This adds ResourceThrottles.
+  scoped_ptr<ResourceHandler> AddThrottlesAndSchedule(
       net::URLRequest* request,
       ResourceType resource_type,
       ResourceContext* resource_context,
       AppCacheService* appcache_service,
       int child_id,
       int route_id,
       scoped_ptr<ResourceHandler> handler);
 
   void OnDataDownloadedACK(int request_id);
   void OnUploadProgressACK(int request_id);
@@ skipping 34 matching lines @@
   // specified |id|.
   void RegisterResourceMessageDelegate(const GlobalRequestID& id,
                                        ResourceMessageDelegate* delegate);
   void UnregisterResourceMessageDelegate(const GlobalRequestID& id,
                                          ResourceMessageDelegate* delegate);
 
   int BuildLoadFlagsForRequest(const ResourceHostMsg_Request& request_data,
                                int child_id,
                                bool is_sync_load);
 
+  void BeginAsyncRevalidation(net::URLRequest* for_request);
+
   LoaderMap pending_loaders_;
 
   // Collection of temp files downloaded for child processes via
   // the download_to_file mechanism. We avoid deleting them until
   // the client no longer needs them.
   typedef std::map<int, scoped_refptr<storage::ShareableFileReference> >
       DeletableFilesMap;  // key is request id
   typedef std::map<int, DeletableFilesMap>
       RegisteredTempFiles;  // key is child process id
   RegisteredTempFiles registered_temp_files_;
@@ skipping 58 matching lines @@
   base::TimeTicks last_user_gesture_time_;
 
   // Used during IPC message dispatching so that the handlers can get a pointer
   // to the source of the message.
   ResourceMessageFilter* filter_;
 
   ResourceDispatcherHostDelegate* delegate_;
 
   bool allow_cross_origin_auth_prompt_;
 
+  // stale-while-revalidate is enabled either via experiment or command-line
+  // flag.
+  bool async_revalidation_enabled_;
+
+  // In progress async revalidations.
+  std::set<std::pair<net::HttpCache*, std::string>>
+      in_progress_async_revalidations_;
+
   // http://crbug.com/90971 - Assists in tracking down use-after-frees on
   // shutdown.
   std::set<const ResourceContext*> active_resource_contexts_;
 
   typedef std::map<GlobalRequestID,
                    ObserverList<ResourceMessageDelegate>*> DelegateMap;
   DelegateMap delegate_map_;
 
   scoped_ptr<ResourceScheduler> scheduler_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_