public PerOperationSampler(int maxOperations, OperationSamplingParameters strategies, ILoggerFactory loggerFactory)
: this(maxOperations,
new Dictionary <string, GuaranteedThroughputSampler>(),
new ProbabilisticSampler(strategies.DefaultSamplingProbability),
strategies.DefaultLowerBoundTracesPerSecond,
loggerFactory)
{
Update(strategies);
}
public void TestUpdate()
{
GuaranteedThroughputSampler guaranteedThroughputSampler = Substitute.ForPartsOf <GuaranteedThroughputSampler>(0, 0);
_operationToSamplers.Add(operation, guaranteedThroughputSampler);
var perOperationSamplingParameters = new PerOperationSamplingParameters(operation, new ProbabilisticSamplingStrategy(SamplingRate));
var parametersList = new List <PerOperationSamplingParameters>();
parametersList.Add(perOperationSamplingParameters);
var parameters = new OperationSamplingParameters(DefaultSamplingProbability, DefaultLowerBoundTracesPerSecond, parametersList);
Assert.True(_undertest.Update(parameters));
guaranteedThroughputSampler.Received(1).Update(SamplingRate, DefaultLowerBoundTracesPerSecond);
//verifyNoMoreInteractions(guaranteedThroughputSampler);
}
internal void UpdatePerOperationSampler(OperationSamplingParameters samplingParameters)
{
lock (_lock)
{
if (Sampler is PerOperationSampler sampler)
{
if (sampler.Update(samplingParameters))
{
_metrics.SamplerUpdated.Inc(1);
}
}
else
{
Sampler.Close();
Sampler = new PerOperationSampler(_maxOperations, samplingParameters, _loggerFactory);
}
}
}
public void TestParsePerOperationSampling()
{
SamplingStrategyResponse response = _undertest.ParseJson(ReadFixture("per_operation_sampling.json"));
OperationSamplingParameters actual = response.OperationSampling;
Assert.Equal(0.001, actual.DefaultSamplingProbability, 4);
Assert.Equal(0.001666, actual.DefaultLowerBoundTracesPerSecond, 4);
List <PerOperationSamplingParameters> actualPerOperationStrategies = actual.PerOperationStrategies;
Assert.Equal(2, actualPerOperationStrategies.Count);
Assert.Equal(
new PerOperationSamplingParameters("GET:/search", new ProbabilisticSamplingStrategy(1.0)),
actualPerOperationStrategies[0]);
Assert.Equal(
new PerOperationSamplingParameters("PUT:/pacifique", new ProbabilisticSamplingStrategy(0.8258308134813166)),
actualPerOperationStrategies[1]);
}
public void TestUpdateToPerOperationSamplerReplacesProbabilisticSampler()
{
var operationToSampler = new List <PerOperationSamplingParameters>();
operationToSampler.Add(new PerOperationSamplingParameters("operation",
new ProbabilisticSamplingStrategy(0.1)));
OperationSamplingParameters parameters = new OperationSamplingParameters(0.11, 0.22, operationToSampler);
SamplingStrategyResponse response = new SamplingStrategyResponse(null,
null, parameters);
_samplingManager.GetSamplingStrategyAsync(SERVICE_NAME).Returns(response);
_undertest.UpdateSampler();
PerOperationSampler perOperationSampler = new PerOperationSampler(2000, parameters, _loggerFactory);
ISampler actualSampler = _undertest.Sampler;
Assert.Equal(perOperationSampler, actualSampler);
}
/// <summary>
/// Updates the <see cref="GuaranteedThroughputSampler"/> for each operation.
/// </summary>
/// <param name="strategies">The parameters for operation sampling.</param>
/// <returns><c>true</c>, if any samplers were updated.</returns>
public bool Update(OperationSamplingParameters strategies)
{
lock (_lock)
{
var isUpdated = false;
LowerBound = strategies.DefaultLowerBoundTracesPerSecond;
ProbabilisticSampler defaultSampler = new ProbabilisticSampler(strategies.DefaultSamplingProbability);
if (!defaultSampler.Equals(DefaultSampler))
{
DefaultSampler.Close();
DefaultSampler = defaultSampler;
isUpdated = true;
}
foreach (var strategy in strategies.PerOperationStrategies)
{
var operation = strategy.Operation;
var samplingRate = strategy.ProbabilisticSampling.SamplingRate;
if (OperationNameToSampler.TryGetValue(operation, out var sampler))
{
isUpdated = sampler.Update(samplingRate, LowerBound) || isUpdated;
}
else
{
if (OperationNameToSampler.Count < MaxOperations)
{
sampler = new GuaranteedThroughputSampler(samplingRate, LowerBound);
OperationNameToSampler[operation] = sampler;
isUpdated = true;
}
else
{
_logger.LogInformation("Exceeded the maximum number of operations {maxOperations} for per operations sampling", MaxOperations);
}
}
}
return(isUpdated);
}
}
public async Task TestUpdatePerOperationSamplerUpdatesExistingPerOperationSampler()
{
OperationSamplingParameters parameters = new OperationSamplingParameters(1, 1, new List <PerOperationSamplingParameters>());
PerOperationSampler perOperationSampler = Substitute.ForPartsOf <PerOperationSampler>(10, parameters, NullLoggerFactory.Instance);
_samplingManager.GetSamplingStrategyAsync(SERVICE_NAME)
.Returns(new SamplingStrategyResponse(null, null, parameters));
_undertest = new RemoteControlledSampler.Builder(SERVICE_NAME)
.WithSamplingManager(_samplingManager)
.WithInitialSampler(perOperationSampler)
.WithMetrics(_metrics)
.Build();
_undertest.UpdateSampler();
await Task.Delay(20);
//updateSampler is hit once automatically because of the pollTimer
perOperationSampler.Received(2).Update(parameters);
}
public void TestNoopUpdate()
{
ProbabilisticSampler defaultProbabilisticSampler = new ProbabilisticSampler(DefaultSamplingProbability);
double operationSamplingRate = 0.23;
_operationToSamplers.Add(operation, new GuaranteedThroughputSampler(operationSamplingRate,
DefaultLowerBoundTracesPerSecond));
_undertest = new PerOperationSampler(MaxOperations, _operationToSamplers, defaultProbabilisticSampler,
DefaultLowerBoundTracesPerSecond, _loggerFactory);
var parametersList = new List <PerOperationSamplingParameters>();
parametersList.Add(new PerOperationSamplingParameters(operation, new ProbabilisticSamplingStrategy(operationSamplingRate)));
var parameters = new OperationSamplingParameters(DefaultSamplingProbability, DefaultLowerBoundTracesPerSecond, parametersList);
Assert.False(_undertest.Update(parameters));
Assert.Equal(_operationToSamplers, _undertest.OperationNameToSampler);
Assert.Equal(DefaultLowerBoundTracesPerSecond, _undertest.LowerBound, DoublePrecision);
Assert.Equal(DefaultSamplingProbability, _undertest.DefaultSampler.SamplingRate, DoublePrecision);
}
