chromecast/net/connectivity_checker.h

   1 // Copyright 2015 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 CHROMECAST_NET_CONNECTIVITY_CHECKER_H_
   6 #define CHROMECAST_NET_CONNECTIVITY_CHECKER_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/observer_list_threadsafe.h"
  11
  12 class GURL;
  13
  14 namespace base {
  15 class SingleThreadTaskRunner;
  16 }
  17
  18 namespace chromecast {
  19
  20 // Checks if internet connectivity is available.
  21 class ConnectivityChecker
  22     : public base::RefCountedThreadSafe<ConnectivityChecker> {
  23  public:
  24   class ConnectivityObserver {
  25    public:
  26     // Will be called when internet connectivity changes.
  27     virtual void OnConnectivityChanged(bool connected) = 0;
  28
  29    protected:
  30     ConnectivityObserver() {}
  31     virtual ~ConnectivityObserver() {}
  32
  33    private:
  34     DISALLOW_COPY_AND_ASSIGN(ConnectivityObserver);
  35   };
  36
  37   static scoped_refptr<ConnectivityChecker> Create(
  38       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
  39
  40   ConnectivityChecker();
  41
  42   void AddConnectivityObserver(ConnectivityObserver* observer);
  43   void RemoveConnectivityObserver(ConnectivityObserver* observer);
  44
  45   // Returns if there is internet connectivity.
  46   virtual bool Connected() const = 0;
  47
  48   // Checks for connectivity.
  49   virtual void Check() = 0;
  50
  51  protected:
  52   virtual ~ConnectivityChecker();
  53
  54   // Notifies observes that connectivity has changed.
  55   void Notify(bool connected);
  56
  57  private:
  58   friend class base::RefCountedThreadSafe<ConnectivityChecker>;
  59
  60   const scoped_refptr<base::ObserverListThreadSafe<ConnectivityObserver>>
  61       connectivity_observer_list_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(ConnectivityChecker);
  64 };
  65
  66 }  // namespace chromecast
  67
  68 #endif  // CHROMECAST_NET_CONNECTIVITY_CHECKER_H_