components/invalidation/ack_handler.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_HANDLER_H_
   6 #define COMPONENTS_INVALIDATION_ACK_HANDLER_H_
   7
   8 #include <vector>
   9
  10 #include "components/invalidation/invalidation_export.h"
  11
  12 namespace invalidation {
  13 class ObjectId;
  14 }  // namespace invalidation
  15
  16 namespace syncer {
  17
  18 class AckHandle;
  19
  20 // An interface for classes that keep track of invalidation acknowledgements.
  21 //
  22 // We don't expect to support more than one "real" implementation of AckHandler,
  23 // but this interface is very useful for testing and implementation hiding.
  24 class INVALIDATION_EXPORT AckHandler {
  25  public:
  26   AckHandler();
  27   virtual ~AckHandler() = 0;
  28
  29   // Record the local acknowledgement of an invalidation identified by |handle|.
  30   virtual void Acknowledge(const invalidation::ObjectId& id,
  31                            const AckHandle& handle) = 0;
  32
  33   // Record the drop of an invalidation identified by |handle|.
  34   virtual void Drop(const invalidation::ObjectId& id,
  35                     const AckHandle& handle) = 0;
  36 };
  37
  38 }  // namespace syncer
  39
  40 #endif  // COMPONENTS_INVALIDATION_ACK_HANDLER_H_