[mDns] Move dns_sd_registry from extension/api/mdns to media/router/discovery/mdns

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

-// Copyright 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_DNS_SD_REGISTRY_H_
-#define CHROME_BROWSER_EXTENSIONS_API_MDNS_DNS_SD_REGISTRY_H_
-
-#include <map>
-#include <memory>
-#include <string>
-#include <utility>
-#include <vector>
-
-#include "base/macros.h"
-#include "base/observer_list.h"
-#include "chrome/browser/extensions/api/mdns/dns_sd_delegate.h"
-
-namespace local_discovery {
-class ServiceDiscoverySharedClient;
-}
-
-namespace extensions {
-
-class DnsSdDeviceLister;
-class ServiceTypeData;
-
-// Registry class for keeping track of discovered network services over DNS-SD.
-class DnsSdRegistry : public DnsSdDelegate {
- public:
-  typedef std::vector<DnsSdService> DnsSdServiceList;
-
-  class DnsSdObserver {
-   public:
-    virtual void OnDnsSdEvent(const std::string& service_type,
-                              const DnsSdServiceList& services) = 0;
-
-   protected:
-    virtual ~DnsSdObserver() {}
-  };
-
-  DnsSdRegistry();
-  explicit DnsSdRegistry(local_discovery::ServiceDiscoverySharedClient* client);
-  virtual ~DnsSdRegistry();
-
-  // Publishes the current device list for |service_type| to event listeners
-  // whose event filter matches the service type.
-  virtual void Publish(const std::string& service_type);
-
-  // Immediately issues a multicast DNS query for all service types of the
-  // calling extension.
-  virtual void ForceDiscovery();
-
-  // Observer registration for parties interested in discovery events.
-  virtual void AddObserver(DnsSdObserver* observer);
-  virtual void RemoveObserver(DnsSdObserver* observer);
-
-  // DNS-SD-related discovery functionality.
-  virtual void RegisterDnsSdListener(const std::string& service_type);
-  virtual void UnregisterDnsSdListener(const std::string& service_type);
-
- protected:
-  // Data class for managing all the resources and information related to a
-  // particular service type.
-  class ServiceTypeData {
-   public:
-    explicit ServiceTypeData(std::unique_ptr<DnsSdDeviceLister> lister);
-    virtual ~ServiceTypeData();
-
-    // Notify the data class of listeners so that it can be reference counted.
-    void ListenerAdded();
-    // Returns true if the last listener was removed.
-    bool ListenerRemoved();
-    int GetListenerCount();
-
-    // Immediately issues a multicast DNS query for the service type owned by
-    // |this|.
-    void ForceDiscovery();
-
-    // Methods for adding, updating or removing services for this service type.
-    bool UpdateService(bool added, const DnsSdService& service);
-    bool RemoveService(const std::string& service_name);
-    // Called when the discovery service was restarted.
-    // Clear the local cache and initiate rediscovery.
-    bool ClearServices();
-
-    const DnsSdRegistry::DnsSdServiceList& GetServiceList();
-
-   private:
-    int ref_count;
-    std::unique_ptr<DnsSdDeviceLister> lister_;
-    DnsSdRegistry::DnsSdServiceList service_list_;
-    DISALLOW_COPY_AND_ASSIGN(ServiceTypeData);
-  };
-
-  virtual DnsSdDeviceLister* CreateDnsSdDeviceLister(
-      DnsSdDelegate* delegate,
-      const std::string& service_type,
-      local_discovery::ServiceDiscoverySharedClient* discovery_client);
-
-  // DnsSdDelegate implementation:
-  void ServiceChanged(const std::string& service_type,
-                      bool added,
-                      const DnsSdService& service) override;
-  void ServiceRemoved(const std::string& service_type,
-                      const std::string& service_name) override;
-  void ServicesFlushed(const std::string& service_type) override;
-
-  std::map<std::string, std::unique_ptr<ServiceTypeData>> service_data_map_;
-
- private:
-  void DispatchApiEvent(const std::string& service_type);
-  bool IsRegistered(const std::string& service_type);
-
-  scoped_refptr<local_discovery::ServiceDiscoverySharedClient>
-      service_discovery_client_;
-  base::ObserverList<DnsSdObserver> observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(DnsSdRegistry);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_API_MDNS_DNS_SD_REGISTRY_H_