private T Get <T>(Func <ISpectatorConfiguration, T> configValue)
{
var now = DateTimeOffset.UtcNow;
if (now <= _expiration)
{
return(configValue(_configurationInstance));
}
Log.Info("Configuration has expired, refreshing from source");
var newConfig = _spectatorConfigurationFactory();
_expiration = now + _expirationInterval;
Log.Info("Configuration loaded.");
if (_configurationInstance != null)
{
var diff = new ConfigurationDifferenceSummary(_configurationInstance, newConfig);
if (!diff.IsEmpty())
{
Log.Info("Configuration changed: \n" + diff);
}
}
_configurationInstance = newConfig;
Log.InfoFormat("Expires next at: {0}", _expiration.ToString("o"));
return(configValue(_configurationInstance));
}
public void when_comparing_two_empty_configurations_then_there_is_no_difference()
{
var first = new EmptyConfiguration();
var second = new EmptyConfiguration();
var summary = new ConfigurationDifferenceSummary(first, second);
Assert.That(summary.IsEmpty);
}
public void when_metric_prefix_is_different_then_it_is_included_in_the_difference_summary()
{
var first = new TestConfiguration
{
MetricPrefix = "first.metric.prefix"
};
var second = new TestConfiguration
{
MetricPrefix = "second.metric.prefix"
};
var summary = new ConfigurationDifferenceSummary(first, second);
Assert.That(summary.ToString(), Is.EqualTo("MetricPrefix: 'first.metric.prefix' → 'second.metric.prefix'\r\n"));
}
public void when_statsd_port_is_different_then_it_is_included_in_the_difference_summary()
{
var first = new TestConfiguration
{
StatsdPort = 0
};
var second = new TestConfiguration
{
StatsdPort = 5
};
var summary = new ConfigurationDifferenceSummary(first, second);
Assert.That(summary.ToString(), Is.EqualTo("StatsdPort: '0' → '5'\r\n"));
}
public void when_statsd_host_is_different_then_it_is_included_in_the_difference_summary()
{
var first = new TestConfiguration
{
StatsdHost = "first.host"
};
var second = new TestConfiguration
{
StatsdHost = "second.host"
};
var summary = new ConfigurationDifferenceSummary(first, second);
Assert.That(summary.ToString(), Is.EqualTo("StatsdHost: 'first.host' → 'second.host'\r\n"));
}
public void when_a_metric_is_added_then_it_is_included_in_the_difference_summary()
{
var first = new TestConfiguration();
var second = new TestConfiguration();
second.Metrics.Add(new MetricConfiguration { Path = "\\New Metric", Template = "new.metric" });
var summary = new ConfigurationDifferenceSummary(first, second);
Assert.That(summary.ToString(), Is.EqualTo("Metrics:\r\n Added '\\New Metric' → 'new.metric'\r\n"));
}
public void when_interval_is_different_then_it_is_included_in_the_difference_summary()
{
var first = new TestConfiguration
{
Interval = TimeSpan.Zero
};
var second = new TestConfiguration
{
Interval = TimeSpan.FromMinutes(5)
};
var summary = new ConfigurationDifferenceSummary(first, second);
Assert.That(summary.ToString(), Is.EqualTo("Interval: '00:00:00' → '00:05:00'\r\n"));
}
public void when_given_two_configurations_with_differences_then_a_summary_is_created()
{
var first = JsonSpectatorConfiguration.LoadConfigFromString(@"{
""statsdHost"": ""basehost"",
""statsdPort"": 8125,
""metricPrefix"": ""base.prefix"",
""interval"": ""00:00:01"",
""metrics"": [
{
""source"": ""performanceCounter"",
""path"": ""\\Processor(_Total)\\Interrupts/sec"",
""type"": ""gauge"",
""template"": ""base.performance.counter""
}
]
}");
var second = JsonSpectatorConfiguration.LoadConfigFromString(@"{
""statsdHost"": ""overridehost"",
""statsdPort"": 8126,
""metricPrefix"": ""override.prefix"",
""interval"": ""00:00:02"",
""metrics"": [
{
""source"": ""performanceCounter"",
""path"": ""\\Processor(_Total)\\% Processor Time"",
""type"": ""gauge"",
""template"": ""base.performance.counter""
},
{
""source"": ""performanceCounter"",
""path"": ""\\Processor(_Total)\\Some Other Thing"",
""type"": ""gauge"",
""template"": ""overridden.performance.counter""
}
]
}");
var summary = new ConfigurationDifferenceSummary(first, second);
Assert.That(summary.ToString(), Is.EqualTo("StatsdHost: 'basehost' → 'overridehost'\r\nStatsdPort: '8125' → '8126'\r\nMetricPrefix: 'base.prefix' → 'override.prefix'\r\nInterval: '00:00:01' → '00:00:02'\r\nMetrics:\r\n Replaced '\\Processor(_Total)\\Interrupts/sec' → 'base.performance.counter' with '\\Processor(_Total)\\% Processor Time' → 'base.performance.counter'\r\n Added '\\Processor(_Total)\\Some Other Thing' → 'overridden.performance.counter'\r\n"));
}
