| // Copyright (c) 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. |
| |
| #include "chrome/browser/sessions/base_session_service.h" |
| |
| #include "base/bind.h" |
| #include "base/threading/thread.h" |
| #include "chrome/browser/sessions/base_session_service_delegate.h" |
| #include "chrome/browser/sessions/session_backend.h" |
| |
| // BaseSessionService --------------------------------------------------------- |
| |
| namespace { |
| |
| // Helper used by ScheduleGetLastSessionCommands. It runs callback on TaskRunner |
| // thread if it's not canceled. |
| void RunIfNotCanceled( |
| const base::CancelableTaskTracker::IsCanceledCallback& is_canceled, |
| const BaseSessionService::GetCommandsCallback& callback, |
| ScopedVector<SessionCommand> commands) { |
| if (is_canceled.Run()) |
| return; |
| callback.Run(commands.Pass()); |
| } |
| |
| void PostOrRunInternalGetCommandsCallback( |
| base::TaskRunner* task_runner, |
| const BaseSessionService::GetCommandsCallback& callback, |
| ScopedVector<SessionCommand> commands) { |
| if (task_runner->RunsTasksOnCurrentThread()) { |
| callback.Run(commands.Pass()); |
| } else { |
| task_runner->PostTask(FROM_HERE, |
| base::Bind(callback, base::Passed(&commands))); |
| } |
| } |
| |
| } // namespace |
| |
| // Delay between when a command is received, and when we save it to the |
| // backend. |
| static const int kSaveDelayMS = 2500; |
| |
| BaseSessionService::BaseSessionService( |
| SessionType type, |
| const base::FilePath& path, |
| BaseSessionServiceDelegate* delegate) |
| : pending_reset_(false), |
| commands_since_reset_(0), |
| delegate_(delegate), |
| sequence_token_(delegate_->GetBlockingPool()->GetSequenceToken()), |
| weak_factory_(this) { |
| backend_ = new SessionBackend(type, path); |
| DCHECK(backend_.get()); |
| } |
| |
| BaseSessionService::~BaseSessionService() {} |
| |
| void BaseSessionService::MoveCurrentSessionToLastSession() { |
| Save(); |
| RunTaskOnBackendThread( |
| FROM_HERE, base::Bind(&SessionBackend::MoveCurrentSessionToLastSession, |
| backend_)); |
| } |
| |
| void BaseSessionService::DeleteLastSession() { |
| RunTaskOnBackendThread( |
| FROM_HERE, |
| base::Bind(&SessionBackend::DeleteLastSession, backend_)); |
| } |
| |
| void BaseSessionService::ScheduleCommand(scoped_ptr<SessionCommand> command) { |
| DCHECK(command); |
| commands_since_reset_++; |
| pending_commands_.push_back(command.release()); |
| StartSaveTimer(); |
| } |
| |
| void BaseSessionService::AppendRebuildCommand( |
| scoped_ptr<SessionCommand> command) { |
| DCHECK(command); |
| pending_commands_.push_back(command.release()); |
| } |
| |
| void BaseSessionService::EraseCommand(SessionCommand* old_command) { |
| ScopedVector<SessionCommand>::iterator it = |
| std::find(pending_commands_.begin(), |
| pending_commands_.end(), |
| old_command); |
| CHECK(it != pending_commands_.end()); |
| pending_commands_.erase(it); |
| } |
| |
| void BaseSessionService::SwapCommand(SessionCommand* old_command, |
| scoped_ptr<SessionCommand> new_command) { |
| ScopedVector<SessionCommand>::iterator it = |
| std::find(pending_commands_.begin(), |
| pending_commands_.end(), |
| old_command); |
| CHECK(it != pending_commands_.end()); |
| *it = new_command.release(); |
| delete old_command; |
| } |
| |
| void BaseSessionService::ClearPendingCommands() { |
| pending_commands_.clear(); |
| } |
| |
| void BaseSessionService::StartSaveTimer() { |
| // Don't start a timer when testing. |
| if (delegate_->ShouldUseDelayedSave() && base::MessageLoop::current() && |
| !weak_factory_.HasWeakPtrs()) { |
| base::MessageLoop::current()->PostDelayedTask( |
| FROM_HERE, |
| base::Bind(&BaseSessionService::Save, |
| weak_factory_.GetWeakPtr()), |
| base::TimeDelta::FromMilliseconds(kSaveDelayMS)); |
| } |
| } |
| |
| void BaseSessionService::Save() { |
| // Inform the delegate that we will save the commands now, giving it the |
| // opportunity to append more commands. |
| delegate_->OnWillSaveCommands(); |
| |
| if (pending_commands_.empty()) |
| return; |
| |
| // We create a new ScopedVector which will receive all elements from the |
| // current commands. This will also clear the current list. |
| RunTaskOnBackendThread( |
| FROM_HERE, |
| base::Bind(&SessionBackend::AppendCommands, backend_, |
| base::Passed(&pending_commands_), |
| pending_reset_)); |
| |
| if (pending_reset_) { |
| commands_since_reset_ = 0; |
| pending_reset_ = false; |
| } |
| |
| delegate_->OnSavedCommands(); |
| } |
| |
| base::CancelableTaskTracker::TaskId |
| BaseSessionService::ScheduleGetLastSessionCommands( |
| const GetCommandsCallback& callback, |
| base::CancelableTaskTracker* tracker) { |
| base::CancelableTaskTracker::IsCanceledCallback is_canceled; |
| base::CancelableTaskTracker::TaskId id = |
| tracker->NewTrackedTaskId(&is_canceled); |
| |
| GetCommandsCallback run_if_not_canceled = |
| base::Bind(&RunIfNotCanceled, is_canceled, callback); |
| |
| GetCommandsCallback callback_runner = |
| base::Bind(&PostOrRunInternalGetCommandsCallback, |
| base::MessageLoopProxy::current(), run_if_not_canceled); |
| |
| RunTaskOnBackendThread( |
| FROM_HERE, |
| base::Bind(&SessionBackend::ReadLastSessionCommands, backend_, |
| is_canceled, callback_runner)); |
| return id; |
| } |
| |
| void BaseSessionService::RunTaskOnBackendThread( |
| const tracked_objects::Location& from_here, |
| const base::Closure& task) { |
| base::SequencedWorkerPool* pool = delegate_->GetBlockingPool(); |
| if (!pool->IsShutdownInProgress()) { |
| pool->PostSequencedWorkerTask(sequence_token_, from_here, task); |
| } else { |
| // Fall back to executing on the main thread if the sequence |
| // worker pool has been requested to shutdown (around shutdown |
| // time). |
| task.Run(); |
| } |
| } |
| |
| bool BaseSessionService::ProcessedAnyCommandsForTest() { |
| return backend_->inited() || !pending_commands().empty(); |
| } |
| |
| bool BaseSessionService::ReadLastSessionCommandsForTest( |
| ScopedVector<SessionCommand>* commands) { |
| return backend_->ReadLastSessionCommandsImpl(commands); |
| } |