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// Copyright 2013 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_file_system/drive_file_sync_task_manager.h"
#include "base/debug/trace_event.h"
#include "base/location.h"
#include "chrome/browser/sync_file_system/drive_file_sync_service.h"
#include "chrome/browser/sync_file_system/drive_file_sync_util.h"
#include "webkit/browser/fileapi/syncable/sync_file_metadata.h"
using fileapi::FileSystemURL;
namespace sync_file_system {
class DriveFileSyncTaskManager::TaskToken {
public:
explicit TaskToken(const base::WeakPtr<DriveFileSyncTaskManager>& manager)
: manager_(manager) {
}
void UpdateTask(const tracked_objects::Location& location) {
location_ = location;
DVLOG(2) << "Token updated: " << location_.ToString();
}
const tracked_objects::Location& location() const { return location_; }
~TaskToken() {
// All task on DriveFileSyncService must hold TaskToken instance to ensure
// no other tasks are running. Also, as soon as a task finishes to work,
// it must return the token to DriveFileSyncService.
// Destroying a token with valid |sync_service_| indicates the token was
// dropped by a task without returning.
if (manager_ && manager_->service_.get()) {
NOTREACHED() << "Unexpected TaskToken deletion from: "
<< location_.ToString();
// Reinitializes the token.
manager_->NotifyTaskDone(
make_scoped_ptr(new TaskToken(manager_)),
SyncStatusCallback(),
SYNC_STATUS_OK);
}
}
private:
base::WeakPtr<DriveFileSyncTaskManager> manager_;
tracked_objects::Location location_;
DISALLOW_COPY_AND_ASSIGN(TaskToken);
};
DriveFileSyncTaskManager::DriveFileSyncTaskManager(
base::WeakPtr<DriveFileSyncService> service)
: service_(service),
last_operation_status_(SYNC_STATUS_OK),
last_gdata_error_(google_apis::HTTP_SUCCESS) {
}
DriveFileSyncTaskManager::~DriveFileSyncTaskManager() {
service_.reset();
token_.reset();
}
void DriveFileSyncTaskManager::Initialize(SyncStatusCode status) {
DCHECK(!token_);
NotifyTaskDone(make_scoped_ptr(new TaskToken(AsWeakPtr())),
SyncStatusCallback(),
status);
}
void DriveFileSyncTaskManager::ScheduleTask(
const Task& task,
const SyncStatusCallback& callback) {
scoped_ptr<TaskToken> token(GetToken(FROM_HERE));
if (!token) {
pending_tasks_.push_back(base::Bind(
&DriveFileSyncTaskManager::ScheduleTask, AsWeakPtr(), task, callback));
return;
}
task.Run(CreateCompletionCallback(token.Pass(), callback));
}
void DriveFileSyncTaskManager::ScheduleTaskIfIdle(const Task& task) {
scoped_ptr<TaskToken> token(GetToken(FROM_HERE));
if (!token)
return;
task.Run(CreateCompletionCallback(token.Pass(), SyncStatusCallback()));
}
void DriveFileSyncTaskManager::NotifyLastDriveError(
google_apis::GDataErrorCode error) {
last_gdata_error_ = error;
}
void DriveFileSyncTaskManager::NotifyTaskDone(
scoped_ptr<TaskToken> token,
const SyncStatusCallback& callback,
SyncStatusCode status) {
DCHECK(token);
last_operation_status_ = status;
token_ = token.Pass();
TRACE_EVENT_ASYNC_END0("Sync FileSystem", "GetToken", this);
DVLOG(3) << "NotifyTaskDone: " << "finished with status=" << status
<< " (" << SyncStatusCodeToString(status) << ")"
<< " " << token_->location().ToString();
service_->NotifyLastOperationStatus(last_operation_status_,
last_gdata_error_);
if (!pending_tasks_.empty()) {
base::Closure closure = pending_tasks_.front();
pending_tasks_.pop_front();
closure.Run();
return;
}
if (!callback.is_null())
callback.Run(status);
service_->MaybeScheduleNextTask();
}
scoped_ptr<DriveFileSyncTaskManager::TaskToken>
DriveFileSyncTaskManager::GetToken(
const tracked_objects::Location& from_here) {
if (!token_)
return scoped_ptr<TaskToken>();
TRACE_EVENT_ASYNC_BEGIN1("Sync FileSystem", "GetToken", this,
"where", from_here.ToString());
token_->UpdateTask(from_here);
return token_.Pass();
}
SyncStatusCallback DriveFileSyncTaskManager::CreateCompletionCallback(
scoped_ptr<TaskToken> token,
const SyncStatusCallback& callback) {
DCHECK(token);
return base::Bind(&DriveFileSyncTaskManager::NotifyTaskDone,
AsWeakPtr(), base::Passed(&token), callback);
}
} // namespace sync_file_system
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