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// 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 "components/sync_driver/shared_change_processor.h"
#include "base/thread_task_runner_handle.h"
#include "components/sync_driver/generic_change_processor.h"
#include "components/sync_driver/generic_change_processor_factory.h"
#include "components/sync_driver/sync_api_component_factory.h"
#include "sync/api/sync_change.h"
using base::AutoLock;
namespace syncer {
class AttachmentService;
}
namespace sync_driver {
SharedChangeProcessor::SharedChangeProcessor()
: disconnected_(false),
type_(syncer::UNSPECIFIED),
frontend_task_runner_(base::ThreadTaskRunnerHandle::Get()),
generic_change_processor_(NULL),
error_handler_(NULL) {
}
SharedChangeProcessor::~SharedChangeProcessor() {
// We can either be deleted when the DTC is destroyed (on UI
// thread), or when the syncer::SyncableService stops syncing (datatype
// thread). |generic_change_processor_|, if non-NULL, must be
// deleted on |backend_loop_|.
if (backend_task_runner_.get()) {
if (backend_task_runner_->BelongsToCurrentThread()) {
delete generic_change_processor_;
} else {
DCHECK(frontend_task_runner_->BelongsToCurrentThread());
if (!backend_task_runner_->DeleteSoon(FROM_HERE,
generic_change_processor_)) {
NOTREACHED();
}
}
} else {
DCHECK(!generic_change_processor_);
}
}
base::WeakPtr<syncer::SyncableService> SharedChangeProcessor::Connect(
SyncApiComponentFactory* sync_factory,
GenericChangeProcessorFactory* processor_factory,
syncer::UserShare* user_share,
DataTypeErrorHandler* error_handler,
syncer::ModelType type,
const base::WeakPtr<syncer::SyncMergeResult>& merge_result) {
DCHECK(sync_factory);
DCHECK(error_handler);
DCHECK_NE(type, syncer::UNSPECIFIED);
backend_task_runner_ = base::ThreadTaskRunnerHandle::Get();
AutoLock lock(monitor_lock_);
if (disconnected_)
return base::WeakPtr<syncer::SyncableService>();
type_ = type;
error_handler_ = error_handler;
base::WeakPtr<syncer::SyncableService> local_service =
sync_factory->GetSyncableServiceForType(type);
if (!local_service.get()) {
LOG(WARNING) << "SyncableService destroyed before DTC was stopped.";
disconnected_ = true;
return base::WeakPtr<syncer::SyncableService>();
}
generic_change_processor_ =
processor_factory->CreateGenericChangeProcessor(type,
user_share,
error_handler,
local_service,
merge_result,
sync_factory).release();
// If available, propagate attachment service to the syncable service.
scoped_ptr<syncer::AttachmentService> attachment_service =
generic_change_processor_->GetAttachmentService();
if (attachment_service) {
local_service->SetAttachmentService(attachment_service.Pass());
}
return local_service;
}
bool SharedChangeProcessor::Disconnect() {
// May be called from any thread.
DVLOG(1) << "Disconnecting change processor.";
AutoLock lock(monitor_lock_);
bool was_connected = !disconnected_;
disconnected_ = true;
error_handler_ = NULL;
return was_connected;
}
ChangeProcessor* SharedChangeProcessor::generic_change_processor() {
return generic_change_processor_;
}
int SharedChangeProcessor::GetSyncCount() {
DCHECK(backend_task_runner_.get());
DCHECK(backend_task_runner_->BelongsToCurrentThread());
AutoLock lock(monitor_lock_);
if (disconnected_) {
LOG(ERROR) << "Change processor disconnected.";
return 0;
}
return generic_change_processor_->GetSyncCount();
}
syncer::SyncError SharedChangeProcessor::ProcessSyncChanges(
const tracked_objects::Location& from_here,
const syncer::SyncChangeList& list_of_changes) {
DCHECK(backend_task_runner_.get());
DCHECK(backend_task_runner_->BelongsToCurrentThread());
AutoLock lock(monitor_lock_);
if (disconnected_) {
// The DTC that disconnects us must ensure it posts a StopSyncing task.
// If we reach this, it means it just hasn't executed yet.
syncer::SyncError error(FROM_HERE,
syncer::SyncError::DATATYPE_ERROR,
"Change processor disconnected.",
type_);
return error;
}
return generic_change_processor_->ProcessSyncChanges(
from_here, list_of_changes);
}
syncer::SyncDataList SharedChangeProcessor::GetAllSyncData(
syncer::ModelType type) const {
syncer::SyncDataList data;
GetAllSyncDataReturnError(type, &data); // Handles the disconnect case.
return data;
}
syncer::SyncError SharedChangeProcessor::GetAllSyncDataReturnError(
syncer::ModelType type,
syncer::SyncDataList* data) const {
DCHECK(backend_task_runner_.get());
DCHECK(backend_task_runner_->BelongsToCurrentThread());
AutoLock lock(monitor_lock_);
if (disconnected_) {
syncer::SyncError error(FROM_HERE,
syncer::SyncError::DATATYPE_ERROR,
"Change processor disconnected.",
type_);
return error;
}
return generic_change_processor_->GetAllSyncDataReturnError(data);
}
syncer::SyncError SharedChangeProcessor::UpdateDataTypeContext(
syncer::ModelType type,
syncer::SyncChangeProcessor::ContextRefreshStatus refresh_status,
const std::string& context) {
DCHECK(backend_task_runner_.get());
DCHECK(backend_task_runner_->BelongsToCurrentThread());
AutoLock lock(monitor_lock_);
if (disconnected_) {
syncer::SyncError error(FROM_HERE,
syncer::SyncError::DATATYPE_ERROR,
"Change processor disconnected.",
type_);
return error;
}
return generic_change_processor_->UpdateDataTypeContext(
type, refresh_status, context);
}
bool SharedChangeProcessor::SyncModelHasUserCreatedNodes(bool* has_nodes) {
DCHECK(backend_task_runner_.get());
DCHECK(backend_task_runner_->BelongsToCurrentThread());
AutoLock lock(monitor_lock_);
if (disconnected_) {
LOG(ERROR) << "Change processor disconnected.";
return false;
}
return generic_change_processor_->SyncModelHasUserCreatedNodes(has_nodes);
}
bool SharedChangeProcessor::CryptoReadyIfNecessary() {
DCHECK(backend_task_runner_.get());
DCHECK(backend_task_runner_->BelongsToCurrentThread());
AutoLock lock(monitor_lock_);
if (disconnected_) {
LOG(ERROR) << "Change processor disconnected.";
return true; // Otherwise we get into infinite spin waiting.
}
return generic_change_processor_->CryptoReadyIfNecessary();
}
bool SharedChangeProcessor::GetDataTypeContext(std::string* context) const {
DCHECK(backend_task_runner_.get());
DCHECK(backend_task_runner_->BelongsToCurrentThread());
AutoLock lock(monitor_lock_);
if (disconnected_) {
LOG(ERROR) << "Change processor disconnected.";
return false;
}
return generic_change_processor_->GetDataTypeContext(context);
}
syncer::SyncError SharedChangeProcessor::CreateAndUploadError(
const tracked_objects::Location& location,
const std::string& message) {
AutoLock lock(monitor_lock_);
if (!disconnected_) {
return error_handler_->CreateAndUploadError(location, message, type_);
} else {
return syncer::SyncError(location,
syncer::SyncError::DATATYPE_ERROR,
message,
type_);
}
}
} // namespace sync_driver
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