1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_EXTENSIONS_API_MDNS_MDNS_API_H_ 6 #define CHROME_BROWSER_EXTENSIONS_API_MDNS_MDNS_API_H_ 7 8 #include <set> 9 #include <string> 10 11 #include "base/memory/scoped_ptr.h" 12 #include "base/threading/thread_checker.h" 13 #include "chrome/browser/extensions/api/mdns/dns_sd_registry.h" 14 #include "extensions/browser/browser_context_keyed_api_factory.h" 15 #include "extensions/browser/event_router.h" 16 17 namespace content { 18 class BrowserContext; 19 } 20 21 namespace extensions { 22 23 class DnsSdRegistry; 24 25 // MDnsAPI is instantiated with the profile and will listen for extensions that 26 // register listeners for the chrome.mdns extension API. It will use a registry 27 // class to start the mDNS listener process (if necessary) and observe new 28 // service events to dispatch them to registered extensions. 29 class MDnsAPI : public BrowserContextKeyedAPI, 30 public EventRouter::Observer, 31 public DnsSdRegistry::DnsSdObserver { 32 public: 33 explicit MDnsAPI(content::BrowserContext* context); 34 virtual ~MDnsAPI(); 35 36 static MDnsAPI* Get(content::BrowserContext* context); 37 38 // BrowserContextKeyedAPI implementation. 39 static BrowserContextKeyedAPIFactory<MDnsAPI>* GetFactoryInstance(); 40 41 // Used to mock out the DnsSdRegistry for testing. 42 void SetDnsSdRegistryForTesting(scoped_ptr<DnsSdRegistry> registry); 43 44 protected: 45 // Retrieve an instance of the registry. Lazily created when needed. 46 virtual DnsSdRegistry* dns_sd_registry(); 47 48 private: 49 friend class BrowserContextKeyedAPIFactory<MDnsAPI>; 50 51 // EventRouter::Observer: 52 virtual void OnListenerAdded(const EventListenerInfo& details) OVERRIDE; 53 virtual void OnListenerRemoved(const EventListenerInfo& details) OVERRIDE; 54 55 // DnsSdRegistry::Observer 56 virtual void OnDnsSdEvent( 57 const std::string& service_type, 58 const DnsSdRegistry::DnsSdServiceList& services) OVERRIDE; 59 60 // BrowserContextKeyedAPI implementation. service_name()61 static const char* service_name() { 62 return "MDnsAPI"; 63 } 64 65 static const bool kServiceIsCreatedWithBrowserContext = true; 66 static const bool kServiceIsNULLWhileTesting = true; 67 68 // Update the current list of service types and update the registry. 69 void UpdateMDnsListeners(const EventListenerInfo& details); 70 71 // Ensure methods are only called on UI thread. 72 base::ThreadChecker thread_checker_; 73 content::BrowserContext* const browser_context_; 74 // Lazily created on first access and destroyed with this API class. 75 scoped_ptr<DnsSdRegistry> dns_sd_registry_; 76 // Current set of service types registered with the registry. 77 std::set<std::string> service_types_; 78 79 DISALLOW_COPY_AND_ASSIGN(MDnsAPI); 80 }; 81 82 } // namespace extensions 83 84 #endif // CHROME_BROWSER_EXTENSIONS_API_MDNS_MDNS_API_H_ 85