Refactor syncable DEVICE_INFO type from ChangeProcessor to SyncableService - part 3.

chrome/browser/sync/glue/device_info_sync_service.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/sync/glue/device_info_sync_service.h"
 
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/sync/glue/local_device_info_provider.h"
 #include "sync/api/sync_change.h"
 #include "sync/protocol/sync.pb.h"
+#include "sync/util/time.h"
 
 namespace browser_sync {
 
 using syncer::ModelType;
 using syncer::SyncChange;
 using syncer::SyncChangeList;
 using syncer::SyncChangeProcessor;
 using syncer::SyncData;
 using syncer::SyncDataList;
 using syncer::SyncErrorFactory;
 using syncer::SyncMergeResult;
 
 DeviceInfoSyncService::DeviceInfoSyncService(
     LocalDeviceInfoProvider* local_device_info_provider)
-    : local_device_info_provider_(local_device_info_provider) {
+    : local_device_backup_time_(-1),
+      local_device_info_provider_(local_device_info_provider) {
   DCHECK(local_device_info_provider);
 }
 
 DeviceInfoSyncService::~DeviceInfoSyncService() {
 }
 
 SyncMergeResult DeviceInfoSyncService::MergeDataAndStartSyncing(
     ModelType type,
     const SyncDataList& initial_sync_data,
     scoped_ptr<SyncChangeProcessor> sync_processor,
     scoped_ptr<SyncErrorFactory> error_handler) {
   DCHECK(sync_processor.get());
   DCHECK(error_handler.get());
   DCHECK_EQ(type, syncer::DEVICE_INFO);
 
   DCHECK(all_data_.empty());
 
   sync_processor_ = sync_processor.Pass();
   error_handler_ = error_handler.Pass();
 
+  // Initialization should be completed before this type is enabled
+  // and local device info must be available.
+  const DeviceInfo* local_device_info =
+      local_device_info_provider_->GetLocalDeviceInfo();
+  DCHECK(local_device_info != NULL);
+
+  // Indicates whether a local device has been added or updated.
+  // |change_type| defaults to ADD and might be changed to
+  // UPDATE to INVALID down below if the initial data contains
+  // data matching the local device ID.
+  SyncChange::SyncChangeType change_type = SyncChange::ACTION_ADD;
+  size_t num_items_new = 0;
+  size_t num_items_updated = 0;
+
   // Iterate over all initial sync data and copy it to the cache.
   for (SyncDataList::const_iterator iter = initial_sync_data.begin();
        iter != initial_sync_data.end();
        ++iter) {
     DCHECK_EQ(syncer::DEVICE_INFO, iter->GetDataType());
-    StoreSyncData(iter->GetSpecifics().device_info().cache_guid(), *iter);
-  }
 
-  size_t num_items_new = initial_sync_data.size();
-  size_t num_items_updated = 0;
-  // Indicates whether a local device has been added or updated.
-  SyncChange::SyncChangeType change_type = SyncChange::ACTION_INVALID;
+    const std::string& id = iter->GetSpecifics().device_info().cache_guid();
 
-  // Initialization should be completed before this type is enabled
-  // and local device info must be available.
-  const DeviceInfo* local_device_info =
-      local_device_info_provider_->GetLocalDeviceInfo();
-  DCHECK(local_device_info != NULL);
-  // Before storing the local device info check if the data with
-  // the same guid has already been synced. This attempts to retrieve
-  // DeviceInfo from the cached data initialized above.
-  scoped_ptr<DeviceInfo> synced_local_device_info =
-      GetDeviceInfo(local_device_info->guid());
+    if (id == local_device_info->guid()) {
+      // |initial_sync_data| contains data matching the local device.
+      scoped_ptr<DeviceInfo> synced_local_device_info =
+          make_scoped_ptr(CreateDeviceInfo(*iter));
 
-  if (synced_local_device_info.get()) {
-    // Local device info has been synced and exists in the cache.
-    // |num_items_new| and |num_items_updated| need to be updated to
-    // reflect that.
-    num_items_new--;
-    // Overwrite the synced device info with the local data only if
-    // it is different.
-    if (!synced_local_device_info->Equals(*local_device_info)) {
-      num_items_updated++;
-      change_type = SyncChange::ACTION_UPDATE;
+      // Retrieve local device backup timestamp value from the sync data.
+      bool has_synced_backup_time =
+          iter->GetSpecifics().device_info().has_backup_timestamp();
+      int64 synced_backup_time =
+          has_synced_backup_time
+              ? iter->GetSpecifics().device_info().backup_timestamp()
+              : -1;
+
+      // Overwrite |local_device_backup_time_| with this value if it
+      // hasn't been set yet.
+      if (!has_local_device_backup_time() && has_synced_backup_time) {
+        set_local_device_backup_time(synced_backup_time);
+      }
+
+      // Store the synced device info for the local device only
+      // it is the same as the local info. Otherwise store the local
+      // device info and issue a change further below after finishing
+      // processing the |initial_sync_data|.
+      if (synced_local_device_info->Equals(*local_device_info) &&
+          synced_backup_time == local_device_backup_time()) {
+        change_type = SyncChange::ACTION_INVALID;
+      } else {
+        num_items_updated++;
+        change_type = SyncChange::ACTION_UPDATE;
+        continue;
+      }
+    } else {
+      // A new device that doesn't match the local device.
+      num_items_new++;
     }
-  } else {
-    // Local device info doesn't yet exist in the cache and
-    // will be added further below.
-    // |num_items_new| and |num_items_updated| are already correct.
-    change_type = SyncChange::ACTION_ADD;
+
+    StoreSyncData(id, *iter);
   }
 
   syncer::SyncMergeResult result(type);
 
-  // Update SyncData from device info if it is new or different than
+  // Add SyncData for the local device if it is new or different than
   // the synced one, and also add it to the |change_list|.
   if (change_type != SyncChange::ACTION_INVALID) {
     SyncData local_data = CreateLocalData(local_device_info);
     StoreSyncData(local_device_info->guid(), local_data);
 
     SyncChangeList change_list;
     change_list.push_back(SyncChange(FROM_HERE, change_type, local_data));
     result.set_error(
         sync_processor_->ProcessSyncChanges(FROM_HERE, change_list));
   }
 
   result.set_num_items_before_association(1);
   result.set_num_items_after_association(all_data_.size());
   result.set_num_items_added(num_items_new);
   result.set_num_items_modified(num_items_updated);
   result.set_num_items_deleted(0);
 
   NotifyObservers();
 
   return result;
 }
 
 void DeviceInfoSyncService::StopSyncing(syncer::ModelType type) {
   all_data_.clear();
   sync_processor_.reset();
   error_handler_.reset();
+  clear_local_device_backup_time();
 }
 
 SyncDataList DeviceInfoSyncService::GetAllSyncData(
     syncer::ModelType type) const {
   SyncDataList list;
 
   for (SyncDataMap::const_iterator iter = all_data_.begin();
        iter != all_data_.end();
        ++iter) {
     list.push_back(iter->second);
@@ skipping 74 matching lines @@
 }
 
 void DeviceInfoSyncService::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void DeviceInfoSyncService::NotifyObservers() {
   FOR_EACH_OBSERVER(Observer, observers_, OnDeviceInfoChange());
 }
 
+void DeviceInfoSyncService::UpdateLocalDeviceBackupTime(
+    base::Time backup_time) {
+  set_local_device_backup_time(syncer::TimeToProtoTime(backup_time));
+
+  if (sync_processor_.get()) {
+    // Local device info must be available in advance
+    DCHECK(local_device_info_provider_->GetLocalDeviceInfo());
+    const std::string& local_id =
+        local_device_info_provider_->GetLocalDeviceInfo()->guid();
+
+    SyncDataMap::iterator iter = all_data_.find(local_id);
+    DCHECK(iter != all_data_.end());
+
+    syncer::SyncData& data = iter->second;
+    if (UpdateBackupTime(&data)) {
+      // Local device backup time has changed.
+      // Push changes to the server via the |sync_processor_|.
+      SyncChangeList change_list;
+      change_list.push_back(SyncChange(
+          FROM_HERE, syncer::SyncChange::ACTION_UPDATE, data));
+      sync_processor_->ProcessSyncChanges(FROM_HERE, change_list);
+    }
+  }
+}
+
+bool DeviceInfoSyncService::UpdateBackupTime(syncer::SyncData* sync_data) {
+  DCHECK(has_local_device_backup_time());
+  DCHECK(sync_data->GetSpecifics().has_device_info());
+  const sync_pb::DeviceInfoSpecifics& source_specifics =
+      sync_data->GetSpecifics().device_info();
+
+  if (!source_specifics.has_backup_timestamp() ||
+      source_specifics.backup_timestamp() != local_device_backup_time()) {
+    sync_pb::EntitySpecifics entity(sync_data->GetSpecifics());
+    entity.mutable_device_info()->set_backup_timestamp(
+        local_device_backup_time());
+    *sync_data = CreateLocalData(entity);
+
+    return true;
+  }
+
+  return false;
+}
+
+base::Time DeviceInfoSyncService::GetLocalDeviceBackupTime() const {
+  return has_local_device_backup_time()
+             ? syncer::ProtoTimeToTime(local_device_backup_time())
+             : base::Time();
+}
+
 SyncData DeviceInfoSyncService::CreateLocalData(const DeviceInfo* info) {
   sync_pb::EntitySpecifics entity;
   sync_pb::DeviceInfoSpecifics& specifics = *entity.mutable_device_info();
 
   specifics.set_cache_guid(info->guid());
   specifics.set_client_name(info->client_name());
   specifics.set_chrome_version(info->chrome_version());
   specifics.set_sync_user_agent(info->sync_user_agent());
   specifics.set_device_type(info->device_type());
   specifics.set_signin_scoped_device_id(info->signin_scoped_device_id());
 
+  if (has_local_device_backup_time()) {
+    specifics.set_backup_timestamp(local_device_backup_time());
+  }
+
+  return CreateLocalData(entity);
+}
+
+SyncData DeviceInfoSyncService::CreateLocalData(
+    const sync_pb::EntitySpecifics& entity) {
+  const sync_pb::DeviceInfoSpecifics& specifics = entity.device_info();
+
   std::string local_device_tag =
-      base::StringPrintf("DeviceInfo_%s", info->guid().c_str());
+      base::StringPrintf("DeviceInfo_%s", specifics.cache_guid().c_str());
 
   return SyncData::CreateLocalData(
-      local_device_tag, info->client_name(), entity);
+      local_device_tag, specifics.client_name(), entity);
 }
 
 DeviceInfo* DeviceInfoSyncService::CreateDeviceInfo(
     const syncer::SyncData sync_data) {
   const sync_pb::DeviceInfoSpecifics& specifics =
       sync_data.GetSpecifics().device_info();
 
   return new DeviceInfo(specifics.cache_guid(),
                         specifics.client_name(),
                         specifics.chrome_version(),
@@ skipping 14 matching lines @@
   SyncDataMap::iterator iter = all_data_.find(client_id);
   if (iter != all_data_.end()) {
     DVLOG(1) << "Deleting DEVICE_INFO for "
              << iter->second.GetSpecifics().device_info().client_name()
              << " with ID " << client_id;
     all_data_.erase(iter);
   }
 }
 
 }  // namespace browser_sync