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// 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.
#ifndef WEBKIT_FILEAPI_SYNCABLE_LOCAL_FILE_SYNC_CONTEXT_H_
#define WEBKIT_FILEAPI_SYNCABLE_LOCAL_FILE_SYNC_CONTEXT_H_
#include <deque>
#include <map>
#include <set>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/file_path.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "googleurl/src/gurl.h"
#include "webkit/fileapi/syncable/file_change.h"
#include "webkit/fileapi/syncable/local_file_sync_status.h"
#include "webkit/fileapi/syncable/sync_callbacks.h"
#include "webkit/fileapi/syncable/sync_status_code.h"
#include "webkit/storage/webkit_storage_export.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace fileapi {
class FileChange;
class FileSystemContext;
class LocalFileChangeTracker;
class SyncableFileOperationRunner;
// This class works as a bridge between LocalFileSyncService (which is a
// per-profile object) and FileSystemContext's (which is a per-storage-partition
// object and may exist multiple in a profile).
// An instance of this class is shared by FileSystemContexts and outlives
// LocalFileSyncService.
class WEBKIT_STORAGE_EXPORT LocalFileSyncContext
: public base::RefCountedThreadSafe<LocalFileSyncContext>,
public LocalFileSyncStatus::Observer {
public:
typedef base::Callback<void(
SyncStatusCode status,
SyncFileType file_type,
const FileChangeList& changes)> ChangeListCallback;
LocalFileSyncContext(base::SingleThreadTaskRunner* ui_task_runner,
base::SingleThreadTaskRunner* io_task_runner);
// Initializes |file_system_context| for syncable file operations and
// registers the it into the internal map.
// Calling this multiple times for the same file_system_context is valid.
// This method must be called on UI thread.
void MaybeInitializeFileSystemContext(const GURL& source_url,
FileSystemContext* file_system_context,
const StatusCallback& callback);
// Called when the corresponding LocalFileSyncService exits.
// This method must be called on UI thread.
void ShutdownOnUIThread();
// Prepares for sync |url| by disabling writes on |url|.
// If the target |url| is being written and cannot start sync it
// returns SYNC_STATUS_WRITING status code via |callback|.
// Otherwise it disables writes, marks the |url| syncing and returns
// the current change set made on |url|.
// This method must be called on UI thread.
void PrepareForSync(FileSystemContext* file_system_context,
const FileSystemURL& url,
const ChangeListCallback& callback);
// Registers |url| to wait until sync is enabled for |url|.
// |on_syncable_callback| is to be called when |url| becomes syncable
// (i.e. when we have no pending writes and the file is successfully locked
// for sync).
//
// Calling this method again while this already has another URL waiting
// for sync will overwrite the previously registered URL.
//
// This method must be called on UI thread.
void RegisterURLForWaitingSync(const FileSystemURL& url,
const base::Closure& on_syncable_callback);
// Applies a remote change.
// This method must be called on UI thread.
void ApplyRemoteChange(
FileSystemContext* file_system_context,
const FileChange& change,
const FilePath& local_path,
const FileSystemURL& url,
const StatusCallback& callback);
// OperationRunner is accessible only on IO thread.
base::WeakPtr<SyncableFileOperationRunner> operation_runner() const;
// SyncContext is accessible only on IO thread.
LocalFileSyncStatus* sync_status() const;
protected:
// LocalFileSyncStatus::Observer overrides. They are called on IO thread.
virtual void OnSyncEnabled(const FileSystemURL& url) OVERRIDE;
virtual void OnWriteEnabled(const FileSystemURL& url) OVERRIDE;
private:
typedef std::deque<StatusCallback> StatusCallbackQueue;
friend class base::RefCountedThreadSafe<LocalFileSyncContext>;
friend class CannedSyncableFileSystem;
virtual ~LocalFileSyncContext();
void ShutdownOnIOThread();
// Helper routines for MaybeInitializeFileSystemContext.
void InitializeFileSystemContextOnIOThread(
const GURL& source_url,
FileSystemContext* file_system_context);
SyncStatusCode InitializeChangeTrackerOnFileThread(
scoped_ptr<LocalFileChangeTracker>* tracker_ptr,
FileSystemContext* file_system_context);
void DidInitializeChangeTracker(
scoped_ptr<LocalFileChangeTracker>* tracker_ptr,
const GURL& source_url,
FileSystemContext* file_system_context,
SyncStatusCode status);
void DidInitialize(
const GURL& source_url,
FileSystemContext* file_system_context,
SyncStatusCode status);
// Helper routines for PrepareForSync.
void DidGetWritingStatusForPrepareForSync(
FileSystemContext* file_system_context,
SyncStatusCode status,
const FileSystemURL& url,
const ChangeListCallback& callback);
void DidApplyRemoteChange(
const StatusCallback& callback_on_ui,
base::PlatformFileError file_error);
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
// Indicates if the sync service is shutdown on UI thread.
bool shutdown_on_ui_;
// OperationRunner. This must be accessed only on IO thread.
scoped_ptr<SyncableFileOperationRunner> operation_runner_;
// Keeps track of writing/syncing status.
// This must be accessed only on IO thread.
scoped_ptr<LocalFileSyncStatus> sync_status_;
// Pointers to file system contexts that have been initialized for
// synchronization (i.e. that own this instance).
// This must be accessed only on UI thread.
std::set<FileSystemContext*> file_system_contexts_;
// Accessed only on UI thread.
std::map<FileSystemContext*, StatusCallbackQueue>
pending_initialize_callbacks_;
// A URL and associated callback waiting for sync is enabled.
// Accessed only on IO thread.
FileSystemURL url_waiting_sync_on_io_;
base::Closure url_syncable_callback_;
DISALLOW_COPY_AND_ASSIGN(LocalFileSyncContext);
};
} // namespace fileapi
#endif // WEBKIT_FILEAPI_SYNCABLE_LOCAL_FILE_SYNC_CONTEXT_H_
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