components/invalidation/ack_handle.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 COMPONENTS_INVALIDATION_ACK_HANDLE_H_
   6 #define COMPONENTS_INVALIDATION_ACK_HANDLE_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/time/time.h"
  13 #include "components/invalidation/invalidation_export.h"
  14
  15 namespace base {
  16 class DictionaryValue;
  17 }
  18
  19 namespace syncer {
  20
  21 // Opaque class that represents a local ack handle. We don't reuse the
  22 // invalidation ack handles to avoid unnecessary dependencies.
  23 class INVALIDATION_EXPORT AckHandle {
  24  public:
  25   static AckHandle CreateUnique();
  26   static AckHandle InvalidAckHandle();
  27
  28   bool Equals(const AckHandle& other) const;
  29
  30   scoped_ptr<base::DictionaryValue> ToValue() const;
  31   bool ResetFromValue(const base::DictionaryValue& value);
  32
  33   bool IsValid() const;
  34
  35   ~AckHandle();
  36
  37  private:
  38   // Explicitly copyable and assignable for STL containers.
  39   AckHandle(const std::string& state, base::Time timestamp);
  40
  41   std::string state_;
  42   base::Time timestamp_;
  43 };
  44
  45 }  // namespace syncer
  46
  47 #endif  // COMPONENTS_INVALIDATION_ACK_HANDLE_H_