Tizen.Network.Nsd/Tizen.Network.Nsd/DnssdBrowser.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 DNSSD.
  23     /// </summary>
  24     /// <since_tizen> 4 </since_tizen>
  25     public class DnssdBrowser : INsdBrowser
  26     {
  27         private string _serviceType;
  28         private uint _browserHandle;
  29         private event EventHandler<DnssdServiceFoundEventArgs> _serviceFound;
  30         private Interop.Nsd.Dnssd.ServiceFoundCallback _serviceFoundCallback;
  31
  32         /// <summary>
  33         /// This event is raised when a DNSSD service is found during service discovery.
  34         /// </summary>
  35         /// <since_tizen> 4 </since_tizen>
  36         public event EventHandler<DnssdServiceFoundEventArgs> 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 DnssdBrowser class to create a DnssdBrowser instance for the given service type.
  51         /// </summary>
  52         /// <param name="serviceType">The DNSSD service type</param>
  53         /// <since_tizen> 4 </since_tizen>
  54         /// <feature>http://tizen.org/feature/network.dnssd</feature>
  55         /// <exception cref="ArgumentException">Thrown when serviceType is null.</exception>
  56         /// <exception cref="NotSupportedException">Thrown when DNSSD is not supported.</exception>
  57         public DnssdBrowser(string serviceType)
  58         {
  59             DnssdInitializer dnssdInit = Globals.s_threadDns.Value;
  60             Log.Info(Globals.LogTag, "Initialize ThreadLocal<DnssdInitializer> instance = " + dnssdInit);
  61             if(serviceType == null)
  62             {
  63                 Log.Debug(Globals.LogTag, "serviceType is null");
  64                 NsdErrorFactory.ThrowDnssdException((int)DnssdError.InvalidParameter);
  65             }
  66
  67             _serviceType = serviceType;
  68         }
  69
  70         /// <summary>
  71         /// Starts browsing the DNSSD 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         /// <privilege>http://tizen.org/privilege/internet</privilege>
  79         /// <feature>http://tizen.org/feature/network.dnssd</feature>
  80         /// <exception cref="InvalidOperationException">Thrown when any other error occurred.</exception>
  81         /// <exception cref="NotSupportedException">Thrown when DNSSD is not supported.</exception>
  82         /// <exception cref="UnauthorizedAccessException">Thrown when permission is denied.</exception>
  83         public void StartDiscovery()
  84         {
  85             DnssdInitializer dnssdInit = Globals.s_threadDns.Value;
  86             Log.Info(Globals.LogTag, "Initialize ThreadLocal<DnssdInitializer> instance = " + dnssdInit);
  87
  88             _serviceFoundCallback = (DnssdServiceState state, uint service, IntPtr userData) =>
  89             {
  90                 if (_serviceFound != null)
  91                 {
  92                     Log.Info(Globals.LogTag, "Inside Service found callback");
  93                     DnssdService dnsService = new DnssdService(service);
  94                     _serviceFound(null, new DnssdServiceFoundEventArgs(state, dnsService));
  95                 }
  96             };
  97
  98             int ret = Interop.Nsd.Dnssd.StartBrowsing(_serviceType, out _browserHandle, _serviceFoundCallback, IntPtr.Zero);
  99             if (ret != (int)DnssdError.None)
 100             {
 101                 Log.Error(Globals.LogTag, "Failed to discover Dnssd remote service, Error - " + (DnssdError)ret);
 102                 NsdErrorFactory.ThrowDnssdException(ret);
 103             }
 104         }
 105
 106         /// <summary>
 107         /// Stops browsing the DNSSD remote service.
 108         /// </summary>
 109         /// <since_tizen> 4 </since_tizen>
 110         /// <feature>http://tizen.org/feature/network.dnssd</feature>
 111         /// <exception cref="InvalidOperationException">Thrown when any other error occurred.</exception>
 112         /// <exception cref="NotSupportedException">Thrown when DNSSD is not supported.</exception>
 113         public void StopDiscovery()
 114         {
 115             int ret = Interop.Nsd.Dnssd.StopBrowsing(_browserHandle);
 116             if (ret != (int)DnssdError.None)
 117             {
 118                 Log.Error(Globals.LogTag, "Failed to stop discovery of Dnssd remote service, Error - " + (DnssdError)ret);
 119                 NsdErrorFactory.ThrowDnssdException(ret);
 120             }
 121         }
 122     }
 123 }