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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.
#ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_TASK_DEPENDENCY_MANAGER_H_
#define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_TASK_DEPENDENCY_MANAGER_H_
#include <map>
#include <set>
#include <string>
#include <vector>
#include "base/files/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "chrome/browser/sync_file_system/subtree_set.h"
namespace sync_file_system {
namespace drive_backend {
struct TaskBlocker {
bool exclusive;
std::string app_id;
std::vector<base::FilePath> paths;
std::vector<std::string> file_ids;
std::vector<int64> tracker_ids;
TaskBlocker();
~TaskBlocker();
};
// This class manages dependency of the background tasks.
class TaskDependencyManager {
public:
TaskDependencyManager();
~TaskDependencyManager();
// Inserts |task_blocker| to the collection and returns true if it
// completes successfully. Returns false and doesn't modify the collection
// if |task_blocker| conflicts other |task_blocker| that is inserted
// before.
// Two |task_blocker| are handled as conflict if:
// - They have common |file_id| or |tracker_id|.
// - Or, they have the same |app_id| and have a |path| that one of its parent
// belongs to the |task_blocker|.
bool Insert(const TaskBlocker* task_blocker);
void Erase(const TaskBlocker* task_blocker);
private:
friend class TaskDependencyManagerTest;
int running_task_count_;
bool running_exclusive_task_;
std::map<std::string, SubtreeSet> paths_by_app_id_;
std::set<std::string> file_ids_;
std::set<int64> tracker_ids_;
DISALLOW_COPY_AND_ASSIGN(TaskDependencyManager);
};
} // namespace drive_backend
} // namespace sync_file_system
#endif // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_TASK_DEPENDENCY_MANAGER_H_
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