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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 <stdint.h>
#include <memory>
#include <vector>
#include "base/callback_list.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/observer_list.h"
#include "chrome/browser/sessions/session_restore_observer.h"
#include "components/history/core/browser/history_service.h"
#include "components/sessions/core/session_types.h"
#include "ui/base/window_open_disposition.h"
class Browser;
class Profile;
class SessionRestoreImpl;
namespace content {
class WebContents;
// SessionRestore handles restoring either the last or saved session. Session
// restore come in two variants, asynchronous or synchronous. The synchronous
// variety is meant for startup and blocks until restore is complete.
class SessionRestore {
// Bitmask representing behaviors available when restoring a session. Populate
// using the values below.
using BehaviorBitmask = uint32_t;
enum {
// Indicates the active tab of the supplied browser should be closed.
// Indicates that if there is a problem restoring the last session then a
// new tabbed browser should be created.
// Restore blocks until complete. This is intended for use during startup
// when we want to block until restore is complete.
// Notification callback list.
using CallbackList = base::CallbackList<void(int)>;
// Used by objects calling RegisterOnSessionRestoredCallback() to de-register
// themselves when they are destroyed.
using CallbackSubscription =
// Restores the last session. |behavior| is a bitmask of Behaviors, see it
// for details. If |browser| is non-null the tabs for the first window are
// added to it. Returns the last active browser.
// If |urls_to_open| is non-empty, a tab is added for each of the URLs.
static Browser* RestoreSession(Profile* profile,
Browser* browser,
BehaviorBitmask behavior,
const std::vector<GURL>& urls_to_open);
// Restores the last session when the last session crashed. It's a wrapper
// of function RestoreSession.
static void RestoreSessionAfterCrash(Browser* browser);
// Opens the startup pages when the last session crashed.
static void OpenStartupPagesAfterCrash(Browser* browser);
// Specifically used in the restoration of a foreign session. This function
// restores the given session windows to multiple browsers. Returns the
// created Browsers.
static std::vector<Browser*> RestoreForeignSessionWindows(
Profile* profile,
std::vector<const sessions::SessionWindow*>::const_iterator begin,
std::vector<const sessions::SessionWindow*>::const_iterator end);
// Specifically used in the restoration of a foreign session. This method
// restores the given session tab to the browser of |source_web_contents| if
// the disposition is not NEW_WINDOW. Returns the WebContents corresponding
// to the restored tab. If |disposition| is CURRENT_TAB, |source_web_contents|
// may be destroyed.
static content::WebContents* RestoreForeignSessionTab(
content::WebContents* source_web_contents,
const sessions::SessionTab& tab,
WindowOpenDisposition disposition);
// Returns true if we're in the process of restoring |profile|.
static bool IsRestoring(const Profile* profile);
// Returns true if synchronously restoring a session.
static bool IsRestoringSynchronously();
// Registers a callback that is notified every time session restore completes.
// Note that 'complete' means all the browsers and tabs have been created but
// have not necessarily finished loading. The integer supplied to the callback
// indicates the number of tabs that were created.
static CallbackSubscription RegisterOnSessionRestoredCallback(
const base::Callback<void(int)>& callback);
// Add/remove an observer to/from this session restore.
static void AddObserver(SessionRestoreObserver* observer);
static void RemoveObserver(SessionRestoreObserver* observer);
// Get called when the tab loader finishes loading tabs in tab restore even
// without session restore started.
static void OnTabLoaderFinishedLoadingTabs();
// Is called when session restore is going to restore a tab.
static void OnWillRestoreTab(content::WebContents* web_contents);
friend class SessionRestoreImpl;
FRIEND_TEST_ALL_PREFIXES(SessionRestoreObserverTest, SingleSessionRestore);
// Session restore observer list.
using SessionRestoreObserverList =
// Accessor for |*on_session_restored_callbacks_|. Creates a new object the
// first time so that it always returns a valid object.
static CallbackList* on_session_restored_callbacks() {
if (!on_session_restored_callbacks_)
on_session_restored_callbacks_ = new CallbackList();
return on_session_restored_callbacks_;
// Accessor for the observer list. Create the list the first time to always
// return a valid reference.
static SessionRestoreObserverList* observers() {
if (!observers_)
observers_ = new SessionRestoreObserverList();
return observers_;
// Contains all registered callbacks for session restore notifications.
static CallbackList* on_session_restored_callbacks_;
// Notify SessionRestoreObservers session restore started. If there are
// multiple concurrent session restores, observers get notified only once in
// the first session restore.
static void NotifySessionRestoreStartedLoadingTabs();
// Contains all registered observers for session restore events.
static SessionRestoreObserverList* observers_;
// Whether session restore started or not.
static bool session_restore_started_;