/// <summary> Returns a list of service infos of the specified type.
///
/// </summary>
/// <param name="type">Service type name, such as <code>_http._tcp.local.</code>.
/// </param>
/// <returns> An array of service instance names.
/// </returns>
public async virtual System.Threading.Tasks.Task <ServiceInfo[]> List(string type)
{
// Implementation note: The first time a list for a given type is
// requested, a ServiceCollector is created which collects service
// infos. This greatly speeds up the performance of subsequent calls
// to this method. The caveats are, that 1) the first call to this method
// for a given type is slow, and 2) we spawn a ServiceCollector
// instance for each service type which increases network traffic a
// little.
ServiceCollector collector;
bool newCollectorCreated;
lock (serviceCollectors.SyncRoot)
{
// TODO: check this
collector = (ServiceCollector)serviceCollectors[type];
if (collector == null)
{
collector = new ServiceCollector(type);
serviceCollectors[type] = collector;
AddServiceListener(type, collector);
newCollectorCreated = true;
}
else
{
newCollectorCreated = false;
}
}
// After creating a new ServiceCollector, we collect service infos for
// 200 milliseconds. This should be enough time, to get some service
// infos from the network.
if (newCollectorCreated)
{
try
{
await System.Threading.Tasks.Task.Delay(new TimeSpan((System.Int64) 10000 * 200));
}
catch
{
}
}
return(collector.list());
}
/// <summary> Returns a list of service infos of the specified type.
///
/// </summary>
/// <param name="type">Service type name, such as <code>_http._tcp.local.</code>.
/// </param>
/// <returns> An array of service instance names.
/// </returns>
public async virtual System.Threading.Tasks.Task<ServiceInfo[]> List(string type)
{
// Implementation note: The first time a list for a given type is
// requested, a ServiceCollector is created which collects service
// infos. This greatly speeds up the performance of subsequent calls
// to this method. The caveats are, that 1) the first call to this method
// for a given type is slow, and 2) we spawn a ServiceCollector
// instance for each service type which increases network traffic a
// little.
ServiceCollector collector;
bool newCollectorCreated;
lock (serviceCollectors.SyncRoot)
{
// TODO: check this
collector = (ServiceCollector) serviceCollectors[type];
if (collector == null)
{
collector = new ServiceCollector(type);
serviceCollectors[type] = collector;
AddServiceListener(type, collector);
newCollectorCreated = true;
}
else
{
newCollectorCreated = false;
}
}
// After creating a new ServiceCollector, we collect service infos for
// 200 milliseconds. This should be enough time, to get some service
// infos from the network.
if (newCollectorCreated)
{
try
{
await System.Threading.Tasks.Task.Delay(new TimeSpan((System.Int64)10000 * 200));
}
catch
{
}
}
return collector.list();
}
