sync: Implement per-type commit interface

sync/engine/build_commit_command.h

-// Copyright 2012 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 SYNC_ENGINE_BUILD_COMMIT_COMMAND_H_
-#define SYNC_ENGINE_BUILD_COMMIT_COMMAND_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/gtest_prod_util.h"
-#include "sync/base/sync_export.h"
-#include "sync/engine/syncer_command.h"
-#include "sync/syncable/entry_kernel.h"
-#include "sync/util/extensions_activity.h"
-
-namespace syncer {
-
-namespace sessions {
-class OrderedCommitSet;
-}
-
-namespace syncable {
-class Entry;
-class BaseTransaction;
-}
-
-// A class that contains the code used to serialize a set of sync items into a
-// protobuf commit message.  This conversion process references the
-// syncable::Directory, which is why it must be called within the same
-// transaction as the GetCommitIdsCommand that fetched the set of items to be
-// committed.
-//
-// See SyncerCommand documentation for more info.
-class SYNC_EXPORT_PRIVATE BuildCommitCommand : public SyncerCommand {
- public:
-  // The batch_commit_set parameter contains a set of references to the items
-  // that should be committed.
-  //
-  // The commit_message parameter is an output parameter which will contain the
-  // fully initialized commit message once ExecuteImpl() has been called.
-  BuildCommitCommand(
-      syncable::BaseTransaction* trans,
-      const sessions::OrderedCommitSet& batch_commit_set,
-      sync_pb::ClientToServerMessage* commit_message,
-      ExtensionsActivity::Records* extensions_activity_buffer);
-  virtual ~BuildCommitCommand();
-
-  // SyncerCommand implementation.
-  virtual SyncerError ExecuteImpl(sessions::SyncSession* session) OVERRIDE;
-
-  // Helper function that takes a snapshot of |meta_entry| and puts it into a
-  // protobuf suitable for use in a commit request message.
-  static void BuildCommitItem(const syncable::Entry& meta_entry,
-                              sync_pb::SyncEntity* sync_entry);
-
- private:
-  FRIEND_TEST_ALL_PREFIXES(BuildCommitCommandTest, InterpolatePosition);
-
-  void AddExtensionsActivityToMessage(sessions::SyncSession* session,
-                                      sync_pb::CommitMessage* message);
-
-  // Fills the config_params field of |message|.
-  void AddClientConfigParamsToMessage(sessions::SyncSession* session,
-                                      sync_pb::CommitMessage* message);
-
-  DISALLOW_COPY_AND_ASSIGN(BuildCommitCommand);
-
-  // A pointer to a valid transaction not owned by this class.
-  syncable::BaseTransaction* trans_;
-
-  // Input parameter; see constructor comment.
-  const sessions::OrderedCommitSet& batch_commit_set_;
-
-  // Output parameter; see constructor comment.
-  sync_pb::ClientToServerMessage* commit_message_;
-
-  ExtensionsActivity::Records* extensions_activity_buffer_;
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_ENGINE_BUILD_COMMIT_COMMAND_H_