Delete blimp/helium and remove references to it from dependent targets

blimp/helium/object_sync_state.h

-// Copyright 2016 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.
-
-#ifndef BLIMP_HELIUM_OBJECT_SYNC_STATE_H_
-#define BLIMP_HELIUM_OBJECT_SYNC_STATE_H_
-
-#include "base/cancelable_callback.h"
-#include "base/memory/ptr_util.h"
-#include "blimp/helium/blimp_helium_export.h"
-#include "blimp/helium/lazy_syncable_adapter.h"
-#include "blimp/helium/syncable.h"
-#include "blimp/helium/update_scheduler.h"
-#include "blimp/helium/version_vector.h"
-
-namespace blimp {
-namespace helium {
-
-// Each registered LazySyncable is associated with an ObjectSyncState object
-// which retains state used to manage Changeset delivery and resynchronization
-// from potential message loss.
-class BLIMP_HELIUM_EXPORT ObjectSyncState {
- public:
-  using MessagePreparedCallback = base::Callback<void(proto::HeliumMessage)>;
-
-  ~ObjectSyncState();
-
-  // Creates an ObjectSyncState instance for a LazySyncable<ChangesetType>,
-  // including a specialized adaptor to the generic LazySyncable<string>
-  // interface.
-  template <class ChangesetType>
-  static std::unique_ptr<ObjectSyncState> CreateForObject(
-      HeliumObjectId object_id,
-      LazySyncable<ChangesetType>* object) {
-    return base::WrapUnique<ObjectSyncState>(new ObjectSyncState(
-        object_id,
-        base::MakeUnique<LazySyncableAdapter<ChangesetType>>(object)));
-  }
-
-  // Called by the UpdateScheduler to request a Changeset for the
-  // LazySyncable.
-  void PrepareChangesetMessage(MessagePreparedCallback callback);
-
-  // Called by the UpdateScheduler to request an ACK-only message.
-  void PrepareAckMessage(MessagePreparedCallback callback);
-
-  // Informs the ObjectSyncState that there is a connected Stream and gives an
-  // UpdateScheduler to send updates to. The scheduler object will not be
-  // destroyed until after OnStreamDisconnected is called.
-  void OnStreamConnected(UpdateScheduler* scheduler);
-
-  // Informs the ObjectSyncState that the Stream has been disconnected and
-  // so the ObjectSyncState should stop any in-process HeliumMessage
-  // preparation.
-  void OnStreamDisconnected();
-
-  // Applies the given Changeset to the LazySyncable and informs the
-  // UpdateScheduler that an acknowledgement message is needed.
-  void OnChangesetReceived(Revision end_revision, const std::string& changeset);
-
-  // Informs the ObjectSyncState that a previously sent HeliumMessage has been
-  // received and acknowledged by the peer.
-  void OnAckReceived(Revision ack_revision);
-
- private:
-  ObjectSyncState(HeliumObjectId object_id,
-                  std::unique_ptr<LazySyncable<std::string>> object);
-
-  // Called by the LazySyncable object when it is updated locally.
-  void OnLocalUpdate();
-
-  // Called when |object_| finishes preparing. Pulls a Changeset from |object_|
-  // and supplies it to |prepare_callback_|.
-  void OnPreparedChangeset();
-
-  // Determines the best time for |object_| to generate a Changeset or
-  // acknowledgement message.
-  UpdateScheduler* scheduler_ = nullptr;
-
-  // Unique ID for |object_|.
-  HeliumObjectId object_id_;
-
-  // Object whose sync state is being tracked.
-  std::unique_ptr<LazySyncable<std::string>> object_;
-
-  // Used to track Changeset receipt and delivery.
-  Revision sent_revision_ = 0;
-  Revision remote_revision_ = 0;
-  Revision acked_revision_ = 0;
-
-  // True if |object_| has local modifications which need delivering.
-  bool is_dirty_ = false;
-
-  // True if we have received a Changeset but have not yet sent an associated
-  // acknowledgement HeliumMessage to the peer.
-  bool remote_revision_needs_ack_ = false;
-
-  // True if all Changesets sent to the peer have been acknowledged.
-  bool is_confirmed_ = true;
-
-  // Callback received from |scheduler_| when it is requesting a HeliumMessage.
-  MessagePreparedCallback prepare_callback_;
-
-  // Used to allow in-progress Changeset preparation by |object_| to be canceled
-  // if the stream is torn down in the meantime.
-  base::CancelableCallback<void()> prepared_for_changeset_callback_;
-
-  DISALLOW_COPY_AND_ASSIGN(ObjectSyncState);
-};
-
-}  // namespace helium
-}  // namespace blimp
-#endif  // BLIMP_HELIUM_OBJECT_SYNC_STATE_H_