/// <summary>
/// Creates an <see cref="IEndPointSource"/> from the specified host IP address or name and port.
/// </summary>
/// <param name="host">The host name of IP address of the StatsD server.</param>
/// <param name="port">The port number to use for the end point.</param>
/// <param name="endpointCacheDuration">The optional period of time to cache the end point value for.</param>
/// <returns>
/// The created instance of <see cref="IEndPointSource"/>.
/// </returns>
/// <exception cref="ArgumentException">
/// <paramref name="host"/> is either <see langword="null"/> or the empty string.
/// </exception>
public static IEndPointSource MakeEndPointSource(string host, int port, TimeSpan?endpointCacheDuration)
{
if (string.IsNullOrWhiteSpace(host))
{
throw new ArgumentException("The StatsD host IP address or name is null or empty.", nameof(host));
}
IEndPointSource source;
if (IPAddress.TryParse(host, out IPAddress address))
{
// If we were given an IP instead of a hostname,
// we can happily keep it the life of this class
var value = new IPEndPoint(address, port);
source = new SimpleEndpointSource(value);
}
else
{
// We have a host name, so we use DNS lookup
source = new DnsLookupIpEndpointSource(host, port);
if (endpointCacheDuration.HasValue)
{
source = new CachedEndpointSource(source, endpointCacheDuration.Value);
}
}
return(source);
}
public static void CachedValueIsReturnedFromInner()
{
var mockInner = new Mock <IEndPointSource>();
mockInner.Setup(x => x.GetEndpoint()).Returns(MakeTestIpEndPoint());
var cachedEndpoint = new CachedEndpointSource(mockInner.Object, TimeSpan.FromMinutes(5));
var value = cachedEndpoint.GetEndpoint();
value.ShouldNotBeNull();
value.ShouldBe(MakeTestIpEndPoint());
mockInner.Verify(x => x.GetEndpoint(), Times.Exactly(1));
}
/// <summary>
/// Creates an <see cref="IEndPointSource"/> from the specified <see cref="EndPoint"/>.
/// </summary>
/// <param name="endpoint">The <see cref="EndPoint"/> to create the end point source for.</param>
/// <param name="endpointCacheDuration">The optional period of time to cache the end point value for.</param>
/// <returns>
/// The created instance of <see cref="IEndPointSource"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="endpoint"/> is <see langword="null"/>.
/// </exception>
public static IEndPointSource MakeEndPointSource(EndPoint endpoint, TimeSpan?endpointCacheDuration)
{
if (endpoint == null)
{
throw new ArgumentNullException(nameof(endpoint));
}
IEndPointSource source = new SimpleEndpointSource(endpoint);
if (endpointCacheDuration.HasValue)
{
source = new CachedEndpointSource(source, endpointCacheDuration.Value);
}
return(source);
}
public static async Task CachedValueIsReturnedAgainAfterExpiry()
{
var mockInner = new Mock <IEndPointSource>();
mockInner.Setup(x => x.GetEndpoint()).Returns(MakeTestIpEndPoint());
var cachedEndpoint = new CachedEndpointSource(mockInner.Object, TimeSpan.FromSeconds(1));
var value1 = cachedEndpoint.GetEndpoint();
var value2 = cachedEndpoint.GetEndpoint();
await Task.Delay(1500);
var value3 = cachedEndpoint.GetEndpoint();
var value4 = cachedEndpoint.GetEndpoint();
mockInner.Verify(x => x.GetEndpoint(), Times.Exactly(2));
}