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DnssdBrowser.cs
executable file
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/
DnssdBrowser.cs
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/*
* Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
namespace Tizen.Network.Nsd
{
/// <summary>
/// This class is used for managing the network service discovery using DNS-SD.
/// </summary>
/// <since_tizen> 4 </since_tizen>
public class DnssdBrowser : INsdBrowser
{
private string _serviceType;
private uint _browserHandle;
private event EventHandler<DnssdServiceFoundEventArgs> _serviceFound;
private Interop.Nsd.Dnssd.ServiceFoundCallback _serviceFoundCallback;
/// <summary>
/// This event is raised when a DNS-SD service is found during the service discovery.
/// </summary>
/// <since_tizen> 4 </since_tizen>
public event EventHandler<DnssdServiceFoundEventArgs> ServiceFound
{
add
{
_serviceFound += value;
}
remove
{
_serviceFound -= value;
}
}
/// <summary>
/// A public constructor for the DnssdBrowser class to create a DnssdBrowser instance for the given service type.
/// </summary>
/// <param name="serviceType">The DNS-SD service type.</param>
/// <since_tizen> 4 </since_tizen>
/// <feature>http://tizen.org/feature/network.service_discovery.dnssd</feature>
/// <exception cref="ArgumentException">Thrown when the serviceType is null.</exception>
/// <exception cref="NotSupportedException">Thrown when DNS-SD is not supported.</exception>
public DnssdBrowser(string serviceType)
{
DnssdInitializer dnssdInit = Globals.s_threadDns.Value;
Log.Info(Globals.LogTag, "Initialize ThreadLocal<DnssdInitializer> instance = " + dnssdInit);
if(serviceType == null)
{
Log.Debug(Globals.LogTag, "serviceType is null");
NsdErrorFactory.ThrowDnssdException((int)DnssdError.InvalidParameter);
}
_serviceType = serviceType;
}
/// <summary>
/// Starts browsing the DNS-SD remote service.
/// </summary>
/// <remarks>
/// If there are any services available, the ServiceFound event will be invoked.
/// The application will keep browsing for the available or unavailable services until it calls StopDiscovery().
/// </remarks>
/// <since_tizen> 4 </since_tizen>
/// <privilege>http://tizen.org/privilege/internet</privilege>
/// <feature>http://tizen.org/feature/network.service_discovery.dnssd</feature>
/// <exception cref="InvalidOperationException">Thrown when any other error occurred.</exception>
/// <exception cref="NotSupportedException">Thrown when DNS-SD is not supported.</exception>
/// <exception cref="UnauthorizedAccessException">Thrown when the permission is denied.</exception>
public void StartDiscovery()
{
DnssdInitializer dnssdInit = Globals.s_threadDns.Value;
Log.Info(Globals.LogTag, "Initialize ThreadLocal<DnssdInitializer> instance = " + dnssdInit);
_serviceFoundCallback = (DnssdServiceState state, uint service, IntPtr userData) =>
{
if (_serviceFound != null)
{
Log.Info(Globals.LogTag, "Inside Service found callback");
DnssdService dnsService = new DnssdService(service);
_serviceFound(null, new DnssdServiceFoundEventArgs(state, dnsService));
}
};
int ret = Interop.Nsd.Dnssd.StartBrowsing(_serviceType, out _browserHandle, _serviceFoundCallback, IntPtr.Zero);
if (ret != (int)DnssdError.None)
{
Log.Error(Globals.LogTag, "Failed to discover Dnssd remote service, Error - " + (DnssdError)ret);
NsdErrorFactory.ThrowDnssdException(ret);
}
}
/// <summary>
/// Stops browsing the DNS-SD remote service.
/// </summary>
/// <since_tizen> 4 </since_tizen>
/// <feature>http://tizen.org/feature/network.service_discovery.dnssd</feature>
/// <exception cref="InvalidOperationException">Thrown when any other error occurred.</exception>
/// <exception cref="NotSupportedException">Thrown when DNS-SD is not supported.</exception>
public void StopDiscovery()
{
int ret = Interop.Nsd.Dnssd.StopBrowsing(_browserHandle);
if (ret != (int)DnssdError.None)
{
Log.Error(Globals.LogTag, "Failed to stop discovery of Dnssd remote service, Error - " + (DnssdError)ret);
NsdErrorFactory.ThrowDnssdException(ret);
}
}
}
}