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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 CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_
#define CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_
#include <list>
#include <set>
#include <string>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/files/file_path.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "base/time/time.h"
#include "content/public/browser/indexed_db_context.h"
#include "url/gurl.h"
class Profile;
// BrowsingDataIndexedDBHelper is an interface for classes dealing with
// aggregating and deleting browsing data stored in indexed databases. A
// client of this class need to call StartFetching from the UI thread to
// initiate the flow, and it'll be notified by the callback in its UI thread at
// some later point.
class BrowsingDataIndexedDBHelper
: public base::RefCountedThreadSafe<BrowsingDataIndexedDBHelper> {
public:
// Create a BrowsingDataIndexedDBHelper instance for the indexed databases
// stored in |context|'s associated profile's user data directory.
explicit BrowsingDataIndexedDBHelper(content::IndexedDBContext* context);
// Starts the fetching process, which will notify its completion via
// |callback|. This must be called only on the UI thread.
virtual void StartFetching(
const base::Callback<void(const std::list<content::IndexedDBInfo>&)>&
callback);
// Requests a single indexed database to be deleted in the IndexedDB thread.
virtual void DeleteIndexedDB(const GURL& origin);
protected:
virtual ~BrowsingDataIndexedDBHelper();
scoped_refptr<content::IndexedDBContext> indexed_db_context_;
// Access to |indexed_db_info_| is triggered indirectly via the UI thread and
// guarded by |is_fetching_|. This means |indexed_db_info_| is only accessed
// while |is_fetching_| is true. The flag |is_fetching_| is only accessed on
// the UI thread.
// In the context of this class |indexed_db_info_| is only accessed on the
// context's IndexedDB thread.
std::list<content::IndexedDBInfo> indexed_db_info_;
// This member is only mutated on the UI thread.
base::Callback<void(const std::list<content::IndexedDBInfo>&)>
completion_callback_;
// Indicates whether or not we're currently fetching information:
// it's true when StartFetching() is called in the UI thread, and it's reset
// after we notified the callback in the UI thread.
// This member is only mutated on the UI thread.
bool is_fetching_;
private:
friend class base::RefCountedThreadSafe<BrowsingDataIndexedDBHelper>;
// Enumerates all indexed database files in the IndexedDB thread.
void FetchIndexedDBInfoInIndexedDBThread();
// Notifies the completion callback in the UI thread.
void NotifyInUIThread();
// Delete a single indexed database in the IndexedDB thread.
void DeleteIndexedDBInIndexedDBThread(const GURL& origin);
DISALLOW_COPY_AND_ASSIGN(BrowsingDataIndexedDBHelper);
};
// This class is an implementation of BrowsingDataIndexedDBHelper that does
// not fetch its information from the indexed database tracker, but gets them
// passed as a parameter.
class CannedBrowsingDataIndexedDBHelper
: public BrowsingDataIndexedDBHelper {
public:
// Contains information about an indexed database.
struct PendingIndexedDBInfo {
PendingIndexedDBInfo(const GURL& origin, const base::string16& name);
~PendingIndexedDBInfo();
bool operator<(const PendingIndexedDBInfo& other) const;
GURL origin;
base::string16 name;
};
explicit CannedBrowsingDataIndexedDBHelper(
content::IndexedDBContext* context);
// Add a indexed database to the set of canned indexed databases that is
// returned by this helper.
void AddIndexedDB(const GURL& origin,
const base::string16& name);
// Clear the list of canned indexed databases.
void Reset();
// True if no indexed databases are currently stored.
bool empty() const;
// Returns the number of currently stored indexed databases.
size_t GetIndexedDBCount() const;
// Returns the current list of indexed data bases.
const std::set<CannedBrowsingDataIndexedDBHelper::PendingIndexedDBInfo>&
GetIndexedDBInfo() const;
// BrowsingDataIndexedDBHelper methods.
void StartFetching(const base::Callback<
void(const std::list<content::IndexedDBInfo>&)>& callback) override;
void DeleteIndexedDB(const GURL& origin) override;
private:
~CannedBrowsingDataIndexedDBHelper() override;
std::set<PendingIndexedDBInfo> pending_indexed_db_info_;
DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataIndexedDBHelper);
};
#endif // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_
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