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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.
#ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_SYNCABLE_FILE_OPERATION_RUNNER_H_
#define CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_SYNCABLE_FILE_OPERATION_RUNNER_H_
#include <list>
#include <vector>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "chrome/browser/sync_file_system/local/local_file_sync_status.h"
#include "storage/browser/fileapi/file_system_url.h"
namespace storage {
class FileSystemURL;
}
namespace sync_file_system {
// This class must run only on IO thread.
// Owned by LocalFileSyncContext.
class SyncableFileOperationRunner
: public base::NonThreadSafe,
public base::SupportsWeakPtr<SyncableFileOperationRunner>,
public LocalFileSyncStatus::Observer {
public:
// Represents an operation task (which usually wraps one FileSystemOperation).
class Task {
public:
Task() {}
virtual ~Task() {}
// Only one of Run() or Cancel() is called.
virtual void Run() = 0;
virtual void Cancel() = 0;
protected:
// This is never called after Run() or Cancel() is called.
virtual const std::vector<storage::FileSystemURL>& target_paths() const = 0;
private:
friend class SyncableFileOperationRunner;
bool IsRunnable(LocalFileSyncStatus* status) const;
void Start(LocalFileSyncStatus* status);
static void CancelAndDelete(Task* task);
DISALLOW_COPY_AND_ASSIGN(Task);
};
SyncableFileOperationRunner(int64 max_inflight_tasks,
LocalFileSyncStatus* sync_status);
~SyncableFileOperationRunner() override;
// LocalFileSyncStatus::Observer overrides.
void OnSyncEnabled(const storage::FileSystemURL& url) override;
void OnWriteEnabled(const storage::FileSystemURL& url) override;
// Runs the given |task| if no sync operation is running on any of
// its target_paths(). This also runs pending tasks that have become
// runnable (before running the given operation).
// If there're ongoing sync tasks on the target_paths this method
// just queues up the |task|.
// Pending tasks are cancelled when this class is destructed.
void PostOperationTask(scoped_ptr<Task> task);
// Runs a next runnable task (if there's any).
void RunNextRunnableTask();
// Called when an operation is completed. This will make |target_paths|
// writable and may start a next runnable task.
void OnOperationCompleted(
const std::vector<storage::FileSystemURL>& target_paths);
LocalFileSyncStatus* sync_status() const { return sync_status_; }
int64 num_pending_tasks() const {
return static_cast<int64>(pending_tasks_.size());
}
int64 num_inflight_tasks() const { return num_inflight_tasks_; }
private:
// Returns true if we should start more tasks.
bool ShouldStartMoreTasks() const;
// Keeps track of the writing/syncing status. Not owned.
LocalFileSyncStatus* sync_status_;
std::list<Task*> pending_tasks_;
const int64 max_inflight_tasks_;
int64 num_inflight_tasks_;
DISALLOW_COPY_AND_ASSIGN(SyncableFileOperationRunner);
};
} // namespace sync_file_system
#endif // CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_SYNCABLE_FILE_OPERATION_RUNNER_H_
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