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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.
#ifndef COMPONENTS_BROWSER_CONTEXT_KEYED_SERVICE_BROWSER_CONTEXT_DEPENDENCY_MANAGER_H_
#define COMPONENTS_BROWSER_CONTEXT_KEYED_SERVICE_BROWSER_CONTEXT_DEPENDENCY_MANAGER_H_
#include "base/memory/singleton.h"
#include "components/browser_context_keyed_service/browser_context_keyed_service_export.h"
#include "components/browser_context_keyed_service/dependency_graph.h"
#ifndef NDEBUG
#include <set>
#endif
class BrowserContextKeyedBaseFactory;
namespace content {
class BrowserContext;
}
// A singleton that listens for context destruction notifications and
// rebroadcasts them to each BrowserContextKeyedBaseFactory in a safe order
// based on the stated dependencies by each service.
class BROWSER_CONTEXT_KEYED_SERVICE_EXPORT BrowserContextDependencyManager {
public:
// Adds/Removes a component from our list of live components. Removing will
// also remove live dependency links.
void AddComponent(BrowserContextKeyedBaseFactory* component);
void RemoveComponent(BrowserContextKeyedBaseFactory* component);
// Adds a dependency between two factories.
void AddEdge(BrowserContextKeyedBaseFactory* depended,
BrowserContextKeyedBaseFactory* dependee);
// Called by each BrowserContext to alert us of its creation. Several services
// want to be started when a context is created. Testing configuration is also
// done at this time. (If you want your BrowserContextKeyedService to be
// started with the BrowserContext, override BrowserContextKeyedBaseFactory::
// ServiceIsCreatedWithBrowserContext() to return true.)
void CreateBrowserContextServices(content::BrowserContext* context,
bool is_testing_context);
// Called by each BrowserContext to alert us that we should destroy services
// associated with it.
void DestroyBrowserContextServices(content::BrowserContext* context);
#ifndef NDEBUG
// Debugging assertion called as part of GetServiceForBrowserContext in debug
// mode. This will NOTREACHED() whenever the user is trying to access a stale
// BrowserContext*.
void AssertBrowserContextWasntDestroyed(content::BrowserContext* context);
#endif
static BrowserContextDependencyManager* GetInstance();
private:
friend class BrowserContextDependencyManagerUnittests;
friend struct DefaultSingletonTraits<BrowserContextDependencyManager>;
BrowserContextDependencyManager();
virtual ~BrowserContextDependencyManager();
#ifndef NDEBUG
void DumpBrowserContextDependencies(content::BrowserContext* context);
#endif
DependencyGraph dependency_graph_;
#ifndef NDEBUG
// A list of context objects that have gone through the Shutdown()
// phase. These pointers are most likely invalid, but we keep track of their
// locations in memory so we can nicely assert if we're asked to do anything
// with them.
std::set<content::BrowserContext*> dead_context_pointers_;
#endif
};
#endif // COMPONENTS_BROWSER_CONTEXT_KEYED_SERVICE_BROWSER_CONTEXT_DEPENDENCY_MANAGER_H_
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