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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_DATABASE_HELPER_H_
#define CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_DATABASE_HELPER_H_
#include <list>
#include <set>
#include <string>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "chrome/common/url_constants.h"
#include "storage/browser/database/database_tracker.h"
#include "storage/common/database/database_identifier.h"
#include "url/gurl.h"
class Profile;
// This class fetches database information in the FILE thread, and notifies
// the UI thread upon completion.
// 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 BrowsingDataDatabaseHelper
: public base::RefCountedThreadSafe<BrowsingDataDatabaseHelper> {
public:
// Contains detailed information about a web database.
struct DatabaseInfo {
DatabaseInfo(const storage::DatabaseIdentifier& identifier,
const std::string& database_name,
const std::string& description,
int64 size,
base::Time last_modified);
~DatabaseInfo();
storage::DatabaseIdentifier identifier;
std::string database_name;
std::string description;
int64 size;
base::Time last_modified;
};
explicit BrowsingDataDatabaseHelper(Profile* profile);
// Starts the fetching process, which will notify its completion via
// callback.
// This must be called only in the UI thread.
virtual void StartFetching(
const base::Callback<void(const std::list<DatabaseInfo>&)>& callback);
// Requests a single database to be deleted in the FILE thread. This must be
// called in the UI thread.
virtual void DeleteDatabase(const std::string& origin_identifier,
const std::string& name);
protected:
friend class base::RefCountedThreadSafe<BrowsingDataDatabaseHelper>;
virtual ~BrowsingDataDatabaseHelper();
// Notifies the completion callback. This must be called in the UI thread.
void NotifyInUIThread();
// Access to |database_info_| is triggered indirectly via the UI thread and
// guarded by |is_fetching_|. This means |database_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 |database_info_| is only accessed on the FILE
// thread.
std::list<DatabaseInfo> database_info_;
// This member is only mutated on the UI thread.
base::Callback<void(const std::list<DatabaseInfo>&)> 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 notify the callback in the UI thread.
// This member is only mutated on the UI thread.
bool is_fetching_;
private:
// Enumerates all databases. This must be called in the FILE thread.
void FetchDatabaseInfoOnFileThread();
// Delete a single database file. This must be called in the FILE thread.
void DeleteDatabaseOnFileThread(const std::string& origin,
const std::string& name);
scoped_refptr<storage::DatabaseTracker> tracker_;
DISALLOW_COPY_AND_ASSIGN(BrowsingDataDatabaseHelper);
};
// This class is a thin wrapper around BrowsingDataDatabaseHelper that does not
// fetch its information from the database tracker, but gets them passed as
// a parameter during construction.
class CannedBrowsingDataDatabaseHelper : public BrowsingDataDatabaseHelper {
public:
struct PendingDatabaseInfo {
PendingDatabaseInfo(const GURL& origin,
const std::string& name,
const std::string& description);
~PendingDatabaseInfo();
// The operator is needed to store |PendingDatabaseInfo| objects in a set.
bool operator<(const PendingDatabaseInfo& other) const;
GURL origin;
std::string name;
std::string description;
};
explicit CannedBrowsingDataDatabaseHelper(Profile* profile);
// Add a database to the set of canned databases that is returned by this
// helper.
void AddDatabase(const GURL& origin,
const std::string& name,
const std::string& description);
// Clear the list of canned databases.
void Reset();
// True if no databases are currently stored.
bool empty() const;
// Returns the number of currently stored databases.
size_t GetDatabaseCount() const;
// Returns the current list of web databases.
const std::set<PendingDatabaseInfo>& GetPendingDatabaseInfo();
// BrowsingDataDatabaseHelper implementation.
void StartFetching(const base::Callback<void(const std::list<DatabaseInfo>&)>&
callback) override;
void DeleteDatabase(const std::string& origin_identifier,
const std::string& name) override;
private:
~CannedBrowsingDataDatabaseHelper() override;
std::set<PendingDatabaseInfo> pending_database_info_;
DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataDatabaseHelper);
};
#endif // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_DATABASE_HELPER_H_
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