/// <inheritdoc/>
protected override void OnStarting()
{
try
{
Logger.Info(string.Format(CultureInfo.InvariantCulture, "Starting metrics stream server on '{0}'.", this.HttpListenerPrefix));
this.listener = new HttpListener();
this.listener.Prefixes.Add(this.HttpListenerPrefix);
this.listener.Start();
this.sampler = new HystrixMetricsSampler(this.SampleInterval, dataProvider);
}
catch (Exception e)
{
if (this.listener != null)
{
this.listener.Stop();
}
Logger.ErrorException("Failed to start stream server.", e);
throw;
}
base.OnStarting();
}
/// <summary>
/// Initializes a new instance of the <see cref="HystrixMetricsStreamer"/> class.
/// </summary>
/// <param name="sampler">The sampler to use to get metrics data.</param>
/// <param name="context">The context of the client connection.</param>
public HystrixMetricsStreamer(HystrixMetricsSampler sampler, HttpListenerContext context)
: base(string.Format(CultureInfo.InvariantCulture, ThreadNameFormat, nextId))
{
if (sampler == null)
{
throw new ArgumentNullException(nameof(sampler));
}
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
this.sampler = sampler;
this.context = context;
this.Id = nextId++;
}
/// <summary>
/// Initializes a new instance of the <see cref="HystrixMetricsStreamServer"/> class.
/// </summary>
/// <param name="httpListenerPrefix">The http listener prefix for listening incoming connections.
/// For examples 'http://+:8888/hystrix/' which accepts connections on any domain on the port 8888 for the url '/hystrix/'.</param>
/// <param name="maxConcurrentConnections">The maximum number of concurrent connections. New clients will be refused if
/// the number of concurrent connections reach this maximum.</param>
/// <param name="sampleInterval">The interval between sampling the Hystrix metrics.
/// Passed through to the <see cref="HystrixMetricsSampler"/></param>
public HystrixMetricsStreamServer(string httpListenerPrefix, int maxConcurrentConnections, TimeSpan sampleInterval, ISampleDataProvider dataProvider = null)
: base(ThreadName)
{
if (string.IsNullOrEmpty(httpListenerPrefix))
{
throw new ArgumentNullException("httpListenerPrefix");
}
if (maxConcurrentConnections <= 0)
{
throw new ArgumentException("Maximum number of concurrent connections must be a positive number.", "maxConcurrentConnections");
}
this.HttpListenerPrefix = httpListenerPrefix;
this.MaxConcurrentConnections = maxConcurrentConnections;
this.SampleInterval = sampleInterval;
this.dataProvider = dataProvider ?? new HystrixSampleDataProvider();
this.sampler = new HystrixMetricsSampler(sampleInterval, this.dataProvider);
}