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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.
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/gtest_prod_util.h"
#include "base/location.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_vector.h"
#include "base/memory/weak_ptr.h"
#include "base/task/cancelable_task_tracker.h"
#include "base/threading/sequenced_worker_pool.h"
#include "chrome/browser/common/cancelable_request.h"
#include "chrome/browser/sessions/session_id.h"
#include "url/gurl.h"
class Profile;
class SessionBackend;
class SessionCommand;
namespace sessions {
class SerializedNavigationEntry;
// BaseSessionService is the super class of both tab restore service and
// session service. It contains commonality needed by both, in particular
// it manages a set of SessionCommands that are periodically sent to a
// SessionBackend.
class BaseSessionService : public CancelableRequestProvider {
// Identifies the type of session service this is. This is used by the
// backend to determine the name of the files.
enum SessionType {
// Creates a new BaseSessionService. After creation you need to invoke
// Init.
// |type| gives the type of session service, |profile| the profile and
// |path| the path to save files to. If |profile| is non-NULL, |path| is
// ignored and instead the path comes from the profile.
BaseSessionService(SessionType type,
Profile* profile,
const base::FilePath& path);
Profile* profile() const { return profile_; }
// Deletes the last session.
void DeleteLastSession();
typedef base::Callback<void(ScopedVector<SessionCommand>)>
virtual ~BaseSessionService();
// Returns the backend.
SessionBackend* backend() const { return backend_.get(); }
// Returns the set of commands that needed to be scheduled. The commands
// in the vector are owned by BaseSessionService, until they are scheduled
// on the backend at which point the backend owns the commands.
std::vector<SessionCommand*>& pending_commands() {
return pending_commands_;
// Whether the next save resets the file before writing to it.
void set_pending_reset(bool value) { pending_reset_ = value; }
bool pending_reset() const { return pending_reset_; }
// Returns the number of commands sent down since the last reset.
int commands_since_reset() const { return commands_since_reset_; }
// Schedules a command. This adds |command| to pending_commands_ and
// invokes StartSaveTimer to start a timer that invokes Save at a later
// time.
virtual void ScheduleCommand(SessionCommand* command);
// Starts the timer that invokes Save (if timer isn't already running).
void StartSaveTimer();
// Saves pending commands to the backend. This is invoked from the timer
// scheduled by StartSaveTimer.
virtual void Save();
// Creates a SessionCommand that represents a navigation.
SessionCommand* CreateUpdateTabNavigationCommand(
SessionID::id_type command_id,
SessionID::id_type tab_id,
const sessions::SerializedNavigationEntry& navigation);
// Creates a SessionCommand that represents marking a tab as an application.
SessionCommand* CreateSetTabExtensionAppIDCommand(
SessionID::id_type command_id,
SessionID::id_type tab_id,
const std::string& extension_id);
// Creates a SessionCommand that containing user agent override used by a
// tab's navigations.
SessionCommand* CreateSetTabUserAgentOverrideCommand(
SessionID::id_type command_id,
SessionID::id_type tab_id,
const std::string& user_agent_override);
// Creates a SessionCommand stores a browser window's app name.
SessionCommand* CreateSetWindowAppNameCommand(
SessionID::id_type command_id,
SessionID::id_type window_id,
const std::string& app_name);
// Converts a SessionCommand previously created by
// CreateUpdateTabNavigationCommand into a
// sessions::SerializedNavigationEntry. Returns true on success. If
// successful |tab_id| is set to the id of the restored tab.
bool RestoreUpdateTabNavigationCommand(
const SessionCommand& command,
sessions::SerializedNavigationEntry* navigation,
SessionID::id_type* tab_id);
// Extracts a SessionCommand as previously created by
// CreateSetTabExtensionAppIDCommand into the tab id and application
// extension id.
bool RestoreSetTabExtensionAppIDCommand(
const SessionCommand& command,
SessionID::id_type* tab_id,
std::string* extension_app_id);
// Extracts a SessionCommand as previously created by
// CreateSetTabUserAgentOverrideCommand into the tab id and user agent.
bool RestoreSetTabUserAgentOverrideCommand(
const SessionCommand& command,
SessionID::id_type* tab_id,
std::string* user_agent_override);
// Extracts a SessionCommand as previously created by
// CreateSetWindowAppNameCommand into the window id and application name.
bool RestoreSetWindowAppNameCommand(
const SessionCommand& command,
SessionID::id_type* window_id,
std::string* app_name);
// Returns true if the entry at specified |url| should be written to disk.
bool ShouldTrackEntry(const GURL& url);
// Invokes SessionBackend::ReadLastSessionCommands with callback on the
// backend thread.
// If testing, SessionBackend::ReadLastSessionCommands is invoked directly.
base::CancelableTaskTracker::TaskId ScheduleGetLastSessionCommands(
const InternalGetCommandsCallback& callback,
base::CancelableTaskTracker* tracker);
// This posts the task to the SequencedWorkerPool, or run immediately
// if the SequencedWorkerPool has been shutdown.
bool RunTaskOnBackendThread(const tracked_objects::Location& from_here,
const base::Closure& task);
// Max number of navigation entries in each direction we'll persist.
static const int max_persist_navigation_count;
friend class BetterSessionRestoreCrashTest;
// The profile. This may be null during testing.
Profile* profile_;
// The backend.
scoped_refptr<SessionBackend> backend_;
// Used to invoke Save.
base::WeakPtrFactory<BaseSessionService> weak_factory_;
// Commands we need to send over to the backend.
std::vector<SessionCommand*> pending_commands_;
// Whether the backend file should be recreated the next time we send
// over the commands.
bool pending_reset_;
// The number of commands sent to the backend before doing a reset.
int commands_since_reset_;
// A token to make sure that all tasks will be serialized.
base::SequencedWorkerPool::SequenceToken sequence_token_;