Tizen.Network.Nsd/Tizen.Network.Nsd/SsdpBrowser.cs

   1 /*
   2  * Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the License);
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an AS IS BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 using System;
  18
  19 namespace Tizen.Network.Nsd
  20 {
  21     /// <summary>
  22     /// This class is used for managing network service discovery using SSDP.
  23     /// </summary>
  24     /// <since_tizen> 4 </since_tizen>
  25     public class SsdpBrowser : INsdBrowser
  26     {
  27         private string _target;
  28         private uint _browserHandle;
  29         private event EventHandler<SsdpServiceFoundEventArgs> _serviceFound;
  30         private Interop.Nsd.Ssdp.ServiceFoundCallback _serviceFoundCallback;
  31
  32         /// <summary>
  33         /// This event is raised when service has become available or unavailable during service discovery using SSDP.
  34         /// </summary>
  35         /// <since_tizen> 4 </since_tizen>
  36         public event EventHandler<SsdpServiceFoundEventArgs> ServiceFound
  37         {
  38             add
  39             {
  40                 _serviceFound += value;
  41             }
  42
  43             remove
  44             {
  45                 _serviceFound -= value;
  46             }
  47         }
  48
  49         /// <summary>
  50         /// A public constructor for SsdpBrowser class to create a SsdpBrowser instance for the given target.
  51         /// </summary>
  52         /// <since_tizen> 4 </since_tizen>
  53         /// <param name="target">The target to browse for the service.</param>
  54         /// <feature>http://tizen.org/feature/network.ssdp</feature>
  55         /// <exception cref="ArgumentException">Thrown when target is null.</exception>
  56         /// <exception cref="NotSupportedException">Thrown when SSDP is not supported.</exception>
  57         public SsdpBrowser(string target)
  58         {
  59             SsdpInitializer ssdpInit = Globals.s_threadSsd.Value;
  60             Log.Info(Globals.LogTag, "Initialize ThreadLocal<SsdpInitializer> instance = " + ssdpInit);
  61             if (target == null)
  62             {
  63                 Log.Debug(Globals.LogTag, "target is null");
  64                 NsdErrorFactory.ThrowSsdpException((int)SsdpError.InvalidParameter);
  65             }
  66
  67             _target = target;
  68         }
  69
  70         /// <summary>
  71         /// Starts browsing the SSDP remote service.
  72         /// </summary>
  73         /// <remarks>
  74         /// If there are any services available, ServiceFound event will be invoked.
  75         /// Application will keep browsing for available/unavailable services until it calls StopDiscovery().
  76         /// </remarks>
  77         /// <since_tizen> 4 </since_tizen>
  78         /// <feature>http://tizen.org/feature/network.ssdp</feature>
  79         /// <exception cref="InvalidOperationException">Thrown when any other error occured.</exception>
  80         /// <exception cref="NotSupportedException">Thrown when SSDP is not supported.</exception>
  81         public void StartDiscovery()
  82         {
  83             SsdpInitializer ssdpInit = Globals.s_threadSsd.Value;
  84             Log.Info(Globals.LogTag, "Initialize ThreadLocal<SsdpInitializer> instance = " + ssdpInit);
  85
  86             _serviceFoundCallback = (SsdpServiceState state, uint service, IntPtr userData) =>
  87             {
  88                 if (_serviceFound != null)
  89                 {
  90                     Log.Info(Globals.LogTag, "Inside Service found callback");
  91                     SsdpService ssdpService = new SsdpService(service);
  92                     _serviceFound(null, new SsdpServiceFoundEventArgs(state, ssdpService));
  93                 }
  94             };
  95
  96             int ret = Interop.Nsd.Ssdp.StartBrowsing(_target, out _browserHandle, _serviceFoundCallback, IntPtr.Zero);
  97             if (ret != (int)SsdpError.None)
  98             {
  99                 Log.Error(Globals.LogTag, "Failed to discover Ssdp remote service, Error - " + (SsdpError)ret);
 100                 NsdErrorFactory.ThrowSsdpException(ret);
 101             }
 102         }
 103
 104         /// <summary>
 105         /// Stops browsing the SSDP remote service.
 106         /// </summary>
 107         /// <since_tizen> 4 </since_tizen>
 108         /// <privilege>http://tizen.org/privilege/internet</privilege>
 109         /// <feature>http://tizen.org/feature/network.ssdp</feature>
 110         /// <exception cref="InvalidOperationException">Thrown when any other error occured.</exception>
 111         /// <exception cref="NotSupportedException">Thrown when SSDP is not supported.</exception>
 112         /// <exception cref="UnauthorizedAccessException">Thrown when permission is denied.</exception>
 113         public void StopDiscovery()
 114         {
 115             int ret = Interop.Nsd.Ssdp.StopBrowsing(_browserHandle);
 116             if (ret != (int)SsdpError.None)
 117             {
 118                 Log.Error(Globals.LogTag, "Failed to stop discovery of Ssdp remote service, Error - " + (SsdpError)ret);
 119                 NsdErrorFactory.ThrowSsdpException(ret);
 120             }
 121         }
 122     }
 123 }