chrome/browser/extensions/api/mdns/mdns_api.h

   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 "chrome/browser/extensions/api/profile_keyed_api_factory.h"
  15 #include "extensions/browser/event_router.h"
  16
  17 namespace extensions {
  18
  19 class DnsSdRegistry;
  20
  21 // MDnsAPI is instantiated with the profile and will listen for extensions that
  22 // register listeners for the chrome.mdns extension API. It will use a registry
  23 // class to start the mDNS listener process (if necessary) and observe new
  24 // service events to dispatch them to registered extensions.
  25 class MDnsAPI : public ProfileKeyedAPI,
  26                 public EventRouter::Observer,
  27                 public DnsSdRegistry::DnsSdObserver {
  28  public:
  29   explicit MDnsAPI(Profile* profile);
  30   virtual ~MDnsAPI();
  31
  32   static MDnsAPI* Get(Profile* profile);
  33
  34   // ProfileKeyedAPI implementation.
  35   static ProfileKeyedAPIFactory<MDnsAPI>* GetFactoryInstance();
  36
  37   // Used to mock out the DnsSdRegistry for testing.
  38   void SetDnsSdRegistryForTesting(scoped_ptr<DnsSdRegistry> registry);
  39
  40  protected:
  41   // Retrieve an instance of the registry. Lazily created when needed.
  42   virtual DnsSdRegistry* dns_sd_registry();
  43
  44  private:
  45   friend class ProfileKeyedAPIFactory<MDnsAPI>;
  46
  47   // EventRouter::Observer:
  48   virtual void OnListenerAdded(const EventListenerInfo& details) OVERRIDE;
  49   virtual void OnListenerRemoved(const EventListenerInfo& details) OVERRIDE;
  50
  51   // DnsSdRegistry::Observer
  52   virtual void OnDnsSdEvent(
  53       const std::string& service_type,
  54       const DnsSdRegistry::DnsSdServiceList& services) OVERRIDE;
  55
  56   // ProfileKeyedAPI implementation.
  57   static const char* service_name() {
  58     return "MDnsAPI";
  59   }
  60
  61   static const bool kServiceIsCreatedWithBrowserContext = true;
  62   static const bool kServiceIsNULLWhileTesting = true;
  63
  64   // Update the current list of service types and update the registry.
  65   void UpdateMDnsListeners(const EventListenerInfo& details);
  66
  67   // Ensure methods are only called on UI thread.
  68   base::ThreadChecker thread_checker_;
  69   Profile* const profile_;
  70   // Lazily created on first access and destroyed with this API class.
  71   scoped_ptr<DnsSdRegistry> dns_sd_registry_;
  72   // Current set of service types registered with the registry.
  73   std::set<std::string> service_types_;
  74
  75   DISALLOW_COPY_AND_ASSIGN(MDnsAPI);
  76 };
  77
  78 }  // namespace extensions
  79
  80 #endif  // CHROME_BROWSER_EXTENSIONS_API_MDNS_MDNS_API_H_