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 <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"
+#include "content/browser/loader/async_revalidation_driver.h"
 #include "content/browser/loader/global_routing_id.h"
 #include "content/browser/loader/resource_loader.h"
 #include "content/browser/loader/resource_loader_delegate.h"
 #include "content/browser/loader/resource_scheduler.h"
 #include "content/common/content_export.h"
 #include "content/common/resource_request_body.h"
 #include "content/public/browser/child_process_data.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/download_url_parameters.h"
 #include "content/public/browser/global_request_id.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/resource_dispatcher_host.h"
 #include "content/public/common/resource_type.h"
 #include "ipc/ipc_message.h"
 #include "net/base/request_priority.h"
 #include "net/cookies/canonical_cookie.h"
 #include "net/url_request/url_request.h"
 
 class ResourceHandler;
 struct ResourceHostMsg_Request;
 
 namespace base {
 class FilePath;
 }
 
 namespace net {
+class URLRequestContext;
 class URLRequestJobFactory;
 }
 
 namespace storage {
+class BlobStorageContext;
 class ShareableFileReference;
 }
 
 namespace content {
 class AppCacheService;
 class NavigationURLLoaderImplCore;
 class ResourceContext;
 class ResourceDispatcherHostDelegate;
 class ResourceMessageDelegate;
 class ResourceMessageFilter;
@@ skipping 229 matching lines @@
   friend class ResourceMessageDelegate;
 
   // Information about status of a ResourceLoader.
   struct LoadInfo {
     GURL url;
     net::LoadStateWithParam load_state;
     uint64 upload_position;
     uint64 upload_size;
   };
 
+  // Request parameters that are not included in ResourceHostMsg_Request. Used
+  // as an argument to ConstructRequest();
+  struct ExtraRequestParams {
+    ExtraRequestParams();
+
+    storage::BlobStorageContext* blob_context;
+    int child_id;
+    bool is_sync_load;
+    bool use_embedded_identity;
+    bool support_async_revalidation;
+    const net::HttpRequestHeaders* extra_headers;
+  };
+
   // Map from ProcessID+RouteID pair to the "most interesting" LoadState.
   typedef std::map<GlobalRoutingID, LoadInfo> LoadInfoMap;
 
+  // Map from ResourceContext, HttpCache and url key to AsyncRevalidationDriver
+  // object.
+  typedef std::map<AsyncRevalidationKey,
+                   AsyncRevalidationDriver*,
+                   AsyncRevalidationKey::LessThan> AsyncRevalidationMap;
+
   // ResourceLoaderDelegate implementation:
   ResourceDispatcherHostLoginDelegate* CreateLoginDelegate(
       ResourceLoader* loader,
       net::AuthChallengeInfo* auth_info) override;
   bool HandleExternalProtocol(ResourceLoader* loader, const GURL& url) override;
   void DidStartRequest(ResourceLoader* loader) override;
   void DidReceiveRedirect(ResourceLoader* loader, const GURL& new_url) override;
   void DidReceiveResponse(ResourceLoader* loader) override;
   void DidFinishLoading(ResourceLoader* loader) override;
 
@@ skipping 108 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
 
+  scoped_ptr<net::URLRequest> ConstructRequest(
+      net::URLRequestContext* request_context,
+      const ResourceHostMsg_Request& request_data,
+      const ExtraRequestParams& extra_params);
+
   // 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,
       ResourceContext* resource_context);
@@ skipping 52 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);
+  void OnAsyncRevalidationComplete(const AsyncRevalidationKey& key);
+  void CancelAsyncRevalidationsForResourceContext(
+      ResourceContext* resource_context);
+
   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_;
+
+  // Async revalidations that are currently in-flight: either waiting to be
+  // scheduled or active on the network.
+  AsyncRevalidationMap 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,
                    base::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_