Refactor syncable DEVICE_INFO type from ChangeProcessor to SyncableService - Part 2

chrome/browser/sync/glue/device_info_sync_service.cc

Index: chrome/browser/sync/glue/device_info_sync_service.cc
diff --git a/chrome/browser/sync/glue/device_info_sync_service.cc b/chrome/browser/sync/glue/device_info_sync_service.cc
new file mode 100644
index 0000000000000000000000000000000000000000..17fd8edf7381882eff4e513dd6fb7ca74c615373
--- /dev/null
+++ b/chrome/browser/sync/glue/device_info_sync_service.cc
@@ -0,0 +1,260 @@
+// 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"
+
+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) {
+  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();
+
+  // 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;
+
+  // 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 (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;
+    }
+  } 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;
+  }
+
+  syncer::SyncMergeResult result(type);
+
+  // Update SyncData from device info 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();
+}
+
+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);
+  }
+
+  return list;
+}
+
+syncer::SyncError DeviceInfoSyncService::ProcessSyncChanges(
+    const tracked_objects::Location& from_here,
+    const SyncChangeList& change_list) {
+  syncer::SyncError error;
+
+  DCHECK(local_device_info_provider_->GetLocalDeviceInfo());
+  const std::string& local_device_id =
+      local_device_info_provider_->GetLocalDeviceInfo()->guid();
+
+  bool has_changes = false;
+
+  // Iterate over all chanages and merge entries.
+  for (SyncChangeList::const_iterator iter = change_list.begin();
+       iter != change_list.end();
+       ++iter) {
+    const SyncData& sync_data = iter->sync_data();
+    DCHECK_EQ(syncer::DEVICE_INFO, sync_data.GetDataType());
+
+    const std::string& client_id =
+        sync_data.GetSpecifics().device_info().cache_guid();
+    // Ignore device info matching the local device.
+    if (local_device_id == client_id) {
+      DVLOG(1) << "Ignoring sync changes for the local DEVICE_INFO";
+      continue;
+    }
+
+    if (iter->change_type() == syncer::SyncChange::ACTION_DELETE) {
+      has_changes = true;
+      DeleteSyncData(client_id);
+    } else if (iter->change_type() == syncer::SyncChange::ACTION_UPDATE ||
+               iter->change_type() == syncer::SyncChange::ACTION_ADD) {
+      has_changes = true;
+      StoreSyncData(client_id, sync_data);
+    } else {
+      error.Reset(FROM_HERE, "Invalid action received.", syncer::DEVICE_INFO);
+    }
+  }
+
+  if (has_changes) {
+    NotifyObservers();
+  }
+
+  return error;
+}
+
+scoped_ptr<DeviceInfo> DeviceInfoSyncService::GetDeviceInfo(
+    const std::string& client_id) const {
+  SyncDataMap::const_iterator iter = all_data_.find(client_id);
+  if (iter == all_data_.end()) {
+    return scoped_ptr<DeviceInfo>();
+  }
+
+  return make_scoped_ptr(CreateDeviceInfo(iter->second));
+}
+
+ScopedVector<DeviceInfo> DeviceInfoSyncService::GetAllDeviceInfo() const {
+  ScopedVector<DeviceInfo> list;
+
+  for (SyncDataMap::const_iterator iter = all_data_.begin();
+       iter != all_data_.end();
+       ++iter) {
+    list.push_back(CreateDeviceInfo(iter->second));
+  }
+
+  return list.Pass();
+}
+
+void DeviceInfoSyncService::AddObserver(Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void DeviceInfoSyncService::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void DeviceInfoSyncService::NotifyObservers() {
+  FOR_EACH_OBSERVER(Observer, observers_, OnDeviceInfoChange());
+}
+
+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());
+
+  std::string local_device_tag =
+      base::StringPrintf("DeviceInfo_%s", info->guid().c_str());
+
+  return SyncData::CreateLocalData(
+      local_device_tag, info->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(),
+                        specifics.sync_user_agent(),
+                        specifics.device_type(),
+                        specifics.signin_scoped_device_id());
+}
+
+void DeviceInfoSyncService::StoreSyncData(const std::string& client_id,
+                                          const SyncData& sync_data) {
+  DVLOG(1) << "Storing DEVICE_INFO for "
+           << sync_data.GetSpecifics().device_info().client_name()
+           << " with ID " << client_id;
+  all_data_[client_id] = sync_data;
+}
+
+void DeviceInfoSyncService::DeleteSyncData(const std::string& client_id) {
+  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