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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 CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_OBSERVER_H_
#define CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_OBSERVER_H_
#include "base/scoped_observer.h"
#include "components/keyed_service/core/keyed_service.h"
#include "extensions/browser/event_router.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/extension_registry_observer.h"
class Profile;
// Profile-keyed class that observes the extension registry to determine load of
// extension-based tts engines.
class TtsEngineExtensionObserver
: public KeyedService,
public extensions::EventRouter::Observer,
public extensions::ExtensionRegistryObserver {
public:
static TtsEngineExtensionObserver* GetInstance(Profile* profile);
// Returns if this observer saw the given extension load. Adds |extension_id|
// as loaded immediately if |update| is set to true.
bool SawExtensionLoad(const std::string& extension_id, bool update);
// Implementation of KeyedService.
void Shutdown() override;
// Implementation of extensions::EventRouter::Observer.
void OnListenerAdded(const extensions::EventListenerInfo& details) override;
// extensions::ExtensionRegistryObserver overrides.
void OnExtensionUnloaded(
content::BrowserContext* browser_context,
const extensions::Extension* extension,
extensions::UnloadedExtensionInfo::Reason reason) override;
private:
explicit TtsEngineExtensionObserver(Profile* profile);
~TtsEngineExtensionObserver() override;
bool IsLoadedTtsEngine(const std::string& extension_id);
ScopedObserver<extensions::ExtensionRegistry,
extensions::ExtensionRegistryObserver>
extension_registry_observer_;
Profile* profile_;
std::set<std::string> engine_extension_ids_;
friend class TtsEngineExtensionObserverFactory;
DISALLOW_COPY_AND_ASSIGN(TtsEngineExtensionObserver);
};
#endif // CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_OBSERVER_H_
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