public void TestFixedTargetAndRateBehaveCorrectly()
{
var strategy = new LocalizedSamplingStrategy();
strategy.Rules.Add(new Core.Sampling.Local.SamplingRule("name", "test", "get", 10, 0.05));
int count = 0;
// fill the fixed target rate
Action action = () =>
{
var input = new SamplingInput("name", "test", "get", "", "");
if (strategy.ShouldTrace(input).SampleDecision == SampleDecision.Sampled)
{
Interlocked.Increment(ref count);
}
};
var actions = Enumerable.Repeat(action, 10).ToArray();
Parallel.Invoke(actions);
Assert.AreEqual(10, count);
count = 0;
var samplingInput = new SamplingInput("name", "test", "get", "", "");
for (int i = 0; i < 200; i++)
{
count += strategy.ShouldTrace(samplingInput).SampleDecision == SampleDecision.Sampled ? 1 : 0;
}
// Default sample rate is 5%. The chance that count == 0 after 200 tries is 0.003%.
Assert.IsTrue(count > 0);
Assert.IsTrue(count < 50);
}
public void TestDefaultRuleWithRequest()
{
var request = new HttpRequestMessage
{
RequestUri = new Uri(@"http://www.amazon.com/api/product"),
Method = HttpMethod.Post
};
request.Headers.Add("Host", "www.amazon.com");
var strategy = new LocalizedSamplingStrategy();
string host = request.Headers.Host;
string url = request.RequestUri.AbsolutePath;
string method = request.Method.Method;
SamplingInput samplingInput = new SamplingInput(host, url, method, "", "");
SamplingResponse samplingResponse = strategy.ShouldTrace(samplingInput);
Assert.AreEqual(SampleDecision.Sampled, samplingResponse.SampleDecision);
Assert.IsTrue(string.IsNullOrEmpty(samplingResponse.RuleName));
}