extensions/browser/mojo/stash_backend.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef EXTENSIONS_BROWSER_MOJO_STASH_BACKEND_H_
   6 #define EXTENSIONS_BROWSER_MOJO_STASH_BACKEND_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/scoped_vector.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "extensions/common/mojo/stash.mojom.h"
  12 #include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
  13
  14 namespace extensions {
  15
  16 // A backend that provides access to StashService for a single extension.
  17 class StashBackend {
  18  public:
  19   explicit StashBackend(const base::Closure& on_handle_readable);
  20   ~StashBackend();
  21
  22   // Creates a StashService that forwards calls to this StashBackend and bind it
  23   // to |request|.
  24   void BindToRequest(mojo::InterfaceRequest<StashService> request);
  25
  26   // Adds the StashedObjects contained within |stash| to the stash.
  27   void AddToStash(mojo::Array<StashedObjectPtr> stash);
  28
  29   // Returns all StashedObjects added to the stash since the last call to
  30   // RetrieveStash.
  31   mojo::Array<StashedObjectPtr> RetrieveStash();
  32
  33  private:
  34   class StashEntry;
  35
  36   // Invoked when a handle is readable.
  37   void OnHandleReady();
  38
  39   // The objects that have been stashed.
  40   ScopedVector<StashEntry> stashed_objects_;
  41
  42   // The callback to call when a handle is readable.
  43   const base::Closure on_handle_readable_;
  44
  45   // Whether a handle has become readable since the last RetrieveStash() call.
  46   bool has_notified_;
  47
  48   base::WeakPtrFactory<StashBackend> weak_factory_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(StashBackend);
  51 };
  52
  53 }  // namespace extensions
  54
  55 #endif  // EXTENSIONS_BROWSER_MOJO_STASH_BACKEND_H_