Implement offline mode behind a flag

content/browser/loader/offline_policy.h

+// Copyright (c) 2013 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 class controls under what conditions resources will be fetched

[rvargas (doing something else), 2013/04/03 21:48:19]

nit: move the comment to just before the class.

[Randy Smith (Not in Mondays), 2013/04/04 19:42:49]

Done.

+// from cache even if stale rather than from the network.  For example,
+// one policy would be that if requests for a particular route (e.g. "tab")
+// is unable to reach the server, other requests made with the same route
+// can be loaded from cache without first requiring a network timeout.
+
+#ifndef CONTENT_BROWSER_LOADER_OFFLINE_POLICY
+#define CONTENT_BROWSER_LOADER_OFFLINE_POLICY
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "webkit/glue/resource_type.h"
+
+struct ResourceHostMsg_Request;
+
+namespace net {
+class HttpResponseInfo;
+class URLRequest;
+}
+
+namespace content {
+
+class OfflinePolicy {
+ public:
+  OfflinePolicy();
+  ~OfflinePolicy();
+
+  // Return any additional load flags to be |'d for the current request.

[rvargas (doing something else), 2013/04/03 21:48:19]

nit: ORed ? OR'd ? added?. By the way, flags should be unsigned ints (but I see
that the caller is currently using ints :(  )

[Randy Smith (Not in Mondays), 2013/04/04 19:42:49]

Done.
I was going to just fix this in RDHI, but
URLRequest::load_flags/set_load_flags() uses int, and that I don't want to take
on :-{.

[rvargas (doing something else), 2013/04/04 20:13:12]

Yeah, that's what I meant... we are using int everywhere. I think it should be
fixed, but definitely not in this CL.

+  int GetAdditionalLoadFlags(int child_id, int route_id, int current_flags,
+                             ResourceType::Type resource_type);
+
+  // Incorporate online/offline information from a completed request.
+  void RequestCompleted(int child_id, int route_id,
+                        const net::HttpResponseInfo& response_info);
+
+  void RouteRemoved(int child_id, int route_id);
+
+private:
+  typedef enum { ROUTE_INIT, ROUTE_ONLINE, ROUTE_OFFLINE } RouteOfflineState;

[rvargas (doing something else), 2013/04/03 21:48:19]

nit: enum RouteOfflineState {}

[Randy Smith (Not in Mondays), 2013/04/04 19:42:49]

Done.

+
+  // child_id, route_id -> state.
+  typedef std::map<std::pair<int, int>, RouteOfflineState> RouteMap;
+
+  RouteMap offline_state_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(OfflinePolicy);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_LOADER_OFFLINE_POLICY