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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_REMOTE_CHANGE_HANDLER_H_
#define CHROME_BROWSER_SYNC_FILE_SYSTEM_REMOTE_CHANGE_HANDLER_H_
#include <map>
#include <set>
#include <string>
#include <utility>
#include "base/files/file_path.h"
#include "base/stl_util.h"
#include "base/time.h"
#include "webkit/browser/fileapi/file_system_url.h"
#include "webkit/fileapi/syncable/file_change.h"
namespace sync_file_system {
// Manages pending remote file changes.
class RemoteChangeHandler {
public:
enum RemoteSyncType {
// Smaller number indicates higher priority in ChangeQueue.
REMOTE_SYNC_TYPE_FETCH = 0,
REMOTE_SYNC_TYPE_INCREMENTAL = 1,
REMOTE_SYNC_TYPE_BATCH = 2,
};
struct RemoteChange {
int64 changestamp;
std::string resource_id;
std::string md5_checksum;
base::Time updated_time;
RemoteSyncType sync_type;
fileapi::FileSystemURL url;
FileChange change;
RemoteChange();
RemoteChange(int64 changestamp,
const std::string& resource_id,
const std::string& md5_checksum,
const base::Time& updated_time,
RemoteSyncType sync_type,
const fileapi::FileSystemURL& url,
const FileChange& change);
~RemoteChange();
};
struct RemoteChangeComparator {
bool operator()(const RemoteChange& left, const RemoteChange& right);
};
RemoteChangeHandler();
virtual ~RemoteChangeHandler();
// Pushes the next change into |remote_change| and returns true.
bool GetChange(RemoteChange* remote_change);
// Pushes the change for the |url| into |remote_change| and returns true.
bool GetChangeForURL(const fileapi::FileSystemURL& url,
RemoteChange* remote_change);
// Appends |remote_change| into the change queue. |remote_change| overrides an
// existing change for the same URL if exists.
void AppendChange(const RemoteChange& remote_change);
// Removes a change for the |url|.
bool RemoveChangeForURL(const fileapi::FileSystemURL& url);
// Removes changes for the |origin|.
void RemoveChangesForOrigin(const GURL& origin);
bool HasChangesForOrigin(const GURL& origin) const;
bool HasChanges() const { return !changes_.empty(); }
size_t ChangesSize() const { return changes_.size(); }
private:
struct ChangeQueueItem {
int64 changestamp;
RemoteSyncType sync_type;
fileapi::FileSystemURL url;
ChangeQueueItem();
ChangeQueueItem(int64 changestamp,
RemoteSyncType sync_type,
const fileapi::FileSystemURL& url);
};
struct ChangeQueueComparator {
bool operator()(const ChangeQueueItem& left, const ChangeQueueItem& right);
};
typedef std::set<ChangeQueueItem, ChangeQueueComparator> PendingChangeQueue;
struct ChangeMapItem {
RemoteChange remote_change;
PendingChangeQueue::iterator position_in_queue;
ChangeMapItem();
ChangeMapItem(const RemoteChange& remote_change,
PendingChangeQueue::iterator position_in_queue);
~ChangeMapItem();
};
// TODO(tzik): Consider using std::pair<base::FilePath, FileType> as the key
// below to support directories and custom conflict handling.
typedef std::map<base::FilePath::StringType, ChangeMapItem> PathToChangeMap;
typedef std::map<GURL, PathToChangeMap> OriginToChangesMap;
PendingChangeQueue changes_;
OriginToChangesMap origin_to_changes_map_;
DISALLOW_COPY_AND_ASSIGN(RemoteChangeHandler);
};
} // namespace sync_file_system
#endif // CHROME_BROWSER_SYNC_FILE_SYSTEM_REMOTE_CHANGE_HANDLER_H_
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