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// Copyright 2014 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 COMPONENTS_KEYED_SERVICE_IOS_BROWSER_STATE_DEPENDENCY_MANAGER_H_
#define COMPONENTS_KEYED_SERVICE_IOS_BROWSER_STATE_DEPENDENCY_MANAGER_H_
#include "base/callback_forward.h"
#include "base/callback_list.h"
#include "base/macros.h"
#include "components/keyed_service/core/dependency_manager.h"
#include "components/keyed_service/core/keyed_service_export.h"
template <typename T>
struct DefaultSingletonTraits;
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();
// Registers context-specific preferences for all services via |registry|.
// |context| should be the BrowserState containing |registry| and is used as
// a key to prevent multiple registrations on the same BrowserState in
// tests.
void RegisterProfilePrefsForServices(
const web::BrowserState* context,
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);
#ifndef NDEBUG
// Debugging assertion called as part of GetServiceForBrowserState in debug
// mode. This will NOTREACHED() whenever the user is trying to access a stale
// BrowserState*.
void AssertBrowserStateWasntDestroyed(web::BrowserState* context);
// 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 test
// (i.e., 0xWhatever might be created, be destroyed, and then a new
// BrowserState object might be created at 0xWhatever).
void MarkBrowserStateLiveForTesting(web::BrowserState* context);
#endif // NDEBUG
private:
friend struct 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(
const base::SupportsUserData* context) const final;
#endif // NDEBUG
DISALLOW_COPY_AND_ASSIGN(BrowserStateDependencyManager);
};
#endif // COMPONENTS_KEYED_SERVICE_IOS_BROWSER_STATE_DEPENDENCY_MANAGER_H_
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