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// Copyright 2014 The Chromium Authors
// 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_backend/task_dependency_manager.h"
#include <utility>
#include "base/check_op.h"
namespace sync_file_system {
namespace drive_backend {
namespace {
// Erases all items in |item_to_erase| from |container|.
template <typename Container1, typename Container2>
void EraseContainer(const Container1& items_to_erase, Container2* container) {
for (auto itr = items_to_erase.begin(); itr != items_to_erase.end(); ++itr) {
container->erase(*itr);
}
}
// Inserts all items in |items_to_insert| to |container|, returns true if all
// items are inserted successfully. Otherwise, returns false and leave
// |container| have the original contents.
template <typename Container1, typename Container2>
bool InsertAllOrNone(const Container1& items_to_insert, Container2* container) {
for (auto itr = items_to_insert.begin(); itr != items_to_insert.end();
++itr) {
if (!container->insert(*itr).second) {
// Revert all successful insertion.
auto end = itr;
itr = items_to_insert.begin();
for (; itr != end; ++itr)
container->erase(*itr);
return false;
}
}
return true;
}
bool InsertPaths(std::vector<base::FilePath> paths_to_insert,
SubtreeSet* paths) {
typedef std::vector<base::FilePath>::const_iterator iterator;
for (iterator itr = paths_to_insert.begin();
itr != paths_to_insert.end(); ++itr) {
if (!paths->insert(*itr)) {
auto end = itr;
for (itr = paths_to_insert.begin(); itr != end; ++itr)
paths->erase(*itr);
return false;
}
}
return true;
}
} // namespace
TaskBlocker::TaskBlocker() : exclusive(false) {}
TaskBlocker::~TaskBlocker() = default;
TaskDependencyManager::TaskDependencyManager()
: running_task_count_(0),
running_exclusive_task_(false) {}
TaskDependencyManager::~TaskDependencyManager() {
DCHECK(paths_by_app_id_.empty());
DCHECK(file_ids_.empty());
DCHECK(tracker_ids_.empty());
}
bool TaskDependencyManager::Insert(const TaskBlocker* task_blocker) {
if (running_exclusive_task_)
return false;
if (!task_blocker) {
++running_task_count_;
return true;
}
if (task_blocker->exclusive) {
if (running_task_count_ ||
!tracker_ids_.empty() ||
!file_ids_.empty() ||
!paths_by_app_id_.empty())
return false;
++running_task_count_;
running_exclusive_task_ = true;
return true;
}
if (!InsertAllOrNone(task_blocker->tracker_ids, &tracker_ids_))
goto fail_on_tracker_id_insertion;
if (!InsertAllOrNone(task_blocker->file_ids, &file_ids_))
goto fail_on_file_id_insertion;
if (!task_blocker->app_id.empty() &&
!InsertPaths(task_blocker->paths,
&paths_by_app_id_[task_blocker->app_id])) {
if (paths_by_app_id_[task_blocker->app_id].empty())
paths_by_app_id_.erase(task_blocker->app_id);
goto fail_on_path_insertion;
}
++running_task_count_;
return true;
fail_on_path_insertion:
EraseContainer(task_blocker->file_ids, &file_ids_);
fail_on_file_id_insertion:
EraseContainer(task_blocker->tracker_ids, &tracker_ids_);
fail_on_tracker_id_insertion:
return false;
}
void TaskDependencyManager::Erase(const TaskBlocker* task_blocker) {
--running_task_count_;
DCHECK_LE(0, running_task_count_);
if (!task_blocker)
return;
if (task_blocker->exclusive) {
DCHECK(running_exclusive_task_);
DCHECK(paths_by_app_id_.empty());
DCHECK(file_ids_.empty());
DCHECK(tracker_ids_.empty());
DCHECK_EQ(0, running_task_count_);
running_exclusive_task_ = false;
return;
}
if (!task_blocker->app_id.empty()) {
EraseContainer(task_blocker->paths,
&paths_by_app_id_[task_blocker->app_id]);
if (paths_by_app_id_[task_blocker->app_id].empty())
paths_by_app_id_.erase(task_blocker->app_id);
}
EraseContainer(task_blocker->file_ids, &file_ids_);
EraseContainer(task_blocker->tracker_ids, &tracker_ids_);
}
} // namespace drive_backend
} // namespace sync_file_system
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