chrome.mdns API

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

+// Copyright (c) 2013 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_EXTENSIONS_API_MDNS_MDNS_API_H_
+#define CHROME_BROWSER_EXTENSIONS_API_MDNS_MDNS_API_H_
+
+#include <map>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "chrome/browser/extensions/api/mdns/nsd_registry.h"
+#include "chrome/browser/extensions/event_router.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
+
+namespace extensions {
+
+// MDnsAPI is instantiated with the profile and will listen for extensions that
+// register listeners for the MDNS extension API. It will use an NSD registry
+// class to start discovery and observe new service events to dispatch them to
+// registered extensions.
+class MDnsAPI : public BrowserContextKeyedService,
+                public EventRouter::Observer,
+                public NsdRegistry::NsdObserver {
+ public:
+  explicit MDnsAPI(Profile* profile);
+  virtual ~MDnsAPI();
+
+  // Used to mock out the NsdRegistry for testing.
+  void SetNsdRegistryForTesting(NsdRegistry* registry);
+
+ protected:
+  // Retrieve an instance to the registry. Lazily create it if needed.
+  virtual NsdRegistry* nsd_registry();
+
+ private:
+  // Mapping from MDNS service types to currently listening extensions.

[mark a. foltz, 2013/09/05 23:08:14]

"to the set of currently listening extensions (by extension id)"

+  typedef std::map<std::string, std::set<std::string> >
+      ServiceTypeToExtensionsMap;
+
+  // EventRouter::Observer:
+  virtual void OnListenerAdded(const EventListenerInfo& details) OVERRIDE;
+  virtual void OnListenerRemoved(const EventListenerInfo& details) OVERRIDE;
+
+  // NsdRegistry::Observer
+  virtual void OnMDnsEvent(
+      const std::string& service_type,
+      const NsdRegistry::NsdServiceList& services) OVERRIDE;
+
+
+  base::ThreadChecker thread_checker_;
+  Profile* const profile_;
+  scoped_ptr<NsdRegistry> nsd_registry_;
+  ServiceTypeToExtensionsMap service_type_to_extensions_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(MDnsAPI);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_MDNS_MDNS_API_H_