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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_KEYED_SERVICE_IOS_BROWSER_STATE_DEPENDENCY_MANAGER_H_
#define COMPONENTS_KEYED_SERVICE_IOS_BROWSER_STATE_DEPENDENCY_MANAGER_H_
#include "base/callback_list.h"
#include "components/keyed_service/core/dependency_manager.h"
#include "components/keyed_service/core/keyed_service_export.h"
namespace base {
template <typename T>
struct DefaultSingletonTraits;
} // namespace base
namespace web {
class BrowserState;
}
namespace user_prefs {
class PrefRegistrySyncable;
}
// A singleton that listens for context destruction notifications and
// rebroadcasts them to each KeyedServiceBaseFactory in a safe order
// based on the stated dependencies by each service.
class KEYED_SERVICE_EXPORT BrowserStateDependencyManager
: public DependencyManager {
public:
static BrowserStateDependencyManager* GetInstance();
BrowserStateDependencyManager(const BrowserStateDependencyManager&) = delete;
BrowserStateDependencyManager& operator=(
const BrowserStateDependencyManager&) = delete;
// Registers context-specific preferences for all services via |registry|.
void RegisterBrowserStatePrefsForServices(
user_prefs::PrefRegistrySyncable* registry);
// Called by each BrowserState to alert us of its creation. Service that
// want to be started when BrowserState is created should override the
// ServiceIsCreatedWithBrowserState() method in their factory. Preferences
// registration also happens during that method call.
void CreateBrowserStateServices(web::BrowserState* context);
// Similar to CreateBrowserStateServices(), except this is used for creating
// test BrowserStates - these contexts will not create services for any
// BrowserStateKeyedBaseFactories that return true from
// ServiceIsNULLWhileTesting().
void CreateBrowserStateServicesForTest(web::BrowserState* context);
// Called by each BrowserState to alert us that we should destroy services
// associated with it.
void DestroyBrowserStateServices(web::BrowserState* context);
// Runtime assertion called as a part of GetServiceForBrowserState() to check
// if |context| is considered stale. This will NOTREACHED() or
// base::debug::DumpWithoutCrashing() depending on the DCHECK_IS_ON() value.
void AssertBrowserStateWasntDestroyed(web::BrowserState* context) const;
// Marks |context| as live (i.e., not stale). This method can be called as a
// safeguard against |AssertBrowserStateWasntDestroyed()| checks going off
// due to |context| aliasing a BrowserState instance from a prior construction
// (i.e., 0xWhatever might be created, be destroyed, and then a new
// BrowserState object might be created at 0xWhatever).
void MarkBrowserStateLive(web::BrowserState* context);
private:
friend struct base::DefaultSingletonTraits<BrowserStateDependencyManager>;
BrowserStateDependencyManager();
~BrowserStateDependencyManager() override;
// Helper function used by CreateBrowserStateServices[ForTest].
void DoCreateBrowserStateServices(web::BrowserState* context,
bool is_testing_context);
#ifndef NDEBUG
// DependencyManager:
void DumpContextDependencies(void* context) const final;
#endif // NDEBUG
};
#endif // COMPONENTS_KEYED_SERVICE_IOS_BROWSER_STATE_DEPENDENCY_MANAGER_H_
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