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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_SHELL_BROWSER_SHELL_KEEP_ALIVE_REQUESTER_H_
#define EXTENSIONS_SHELL_BROWSER_SHELL_KEEP_ALIVE_REQUESTER_H_
#include "apps/app_lifetime_monitor.h"
#include "base/containers/flat_map.h"
#include "base/scoped_observation.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/extension_registry_observer.h"
#include "extensions/common/extension_id.h"
class ScopedKeepAlive;
namespace content {
class BrowserContext;
} // namespace content
namespace extensions {
// Maintains keep-alives while apps are loading or launching.
//
// Motivation: When an app reloads, its app windows close. If these were the
// last windows open, the application may exit. Keep-alives can be used to
// ensure the application doesn't exit until the app has had a chance to load
// and launch.
class ShellKeepAliveRequester : public ExtensionRegistryObserver,
public apps::AppLifetimeMonitor::Observer {
public:
explicit ShellKeepAliveRequester(content::BrowserContext* browser_context);
ShellKeepAliveRequester(const ShellKeepAliveRequester&) = delete;
ShellKeepAliveRequester& operator=(const ShellKeepAliveRequester&) = delete;
~ShellKeepAliveRequester() override;
// Owner should call this before starting to reload an app, so that a
// keep-alive may be created when the app is closed.
// Should be followed by a call to StopTrackingReload().
void StartTrackingReload(const Extension* extension);
// Owner should call this after reloading an app succeeds or fails, so the
// keep-alive can be cleaned up.
void StopTrackingReload(const ExtensionId& old_extension_id);
// ExtensionRegistryObserver:
void OnExtensionLoaded(content::BrowserContext* browser_context,
const Extension* extension) override;
void OnExtensionUnloaded(content::BrowserContext* browser_context,
const Extension* extension,
UnloadedExtensionReason reason) override;
// apps::AppLifetimeMonitor::Observer:
void OnAppActivated(content::BrowserContext* context,
const std::string& app_id) override;
void OnAppStop(content::BrowserContext* context,
const std::string& app_id) override;
private:
// Keep-alives saved while waiting for apps to finish reloading or launch
// their first app window, since the DesktopController might have no windows
// and would otherwise exit.
base::flat_map<ExtensionId, std::unique_ptr<ScopedKeepAlive>>
app_launching_keep_alives_;
base::flat_map<ExtensionId, std::unique_ptr<ScopedKeepAlive>>
app_reloading_keep_alives_;
base::ScopedObservation<ExtensionRegistry, ExtensionRegistryObserver>
extension_registry_observation_{this};
base::ScopedObservation<apps::AppLifetimeMonitor,
apps::AppLifetimeMonitor::Observer>
app_lifetime_monitor_observation_{this};
};
} // namespace extensions
#endif // EXTENSIONS_SHELL_BROWSER_SHELL_KEEP_ALIVE_REQUESTER_H_
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