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// This file is part of CAF, the C++ Actor Framework. See the file LICENSE in
// the main distribution directory for license terms and copyright or visit
// https://github.com/actor-framework/actor-framework/blob/master/LICENSE.
#define CAF_SUITE telemetry.histogram
#include "caf/telemetry/histogram.hpp"
#include "core-test.hpp"
#include <cmath>
#include <limits>
#include "caf/telemetry/gauge.hpp"
using namespace caf;
using namespace caf::telemetry;
CAF_TEST(double histograms use infinity for the last bucket) {
dbl_histogram h1{.1, .2, .4, .8};
CHECK_EQ(h1.buckets().size(), 5u);
CHECK_EQ(h1.buckets().front().upper_bound, .1);
CHECK(std::isinf(h1.buckets().back().upper_bound));
CHECK_EQ(h1.sum(), 0.0);
}
CAF_TEST(integer histograms use int_max for the last bucket) {
using limits = std::numeric_limits<int64_t>;
int_histogram h1{1, 2, 4, 8};
CHECK_EQ(h1.buckets().size(), 5u);
CHECK_EQ(h1.buckets().front().upper_bound, 1);
CHECK_EQ(h1.buckets().back().upper_bound, limits::max());
CHECK_EQ(h1.sum(), 0);
}
CAF_TEST(histograms aggregate to buckets and keep a sum) {
int_histogram h1{2, 4, 8};
for (int64_t value = 1; value < 11; ++value)
h1.observe(value);
auto buckets = h1.buckets();
CAF_REQUIRE_EQUAL(buckets.size(), 4u);
CHECK_EQ(buckets[0].count.value(), 2); // 1, 2
CHECK_EQ(buckets[1].count.value(), 2); // 3, 4
CHECK_EQ(buckets[2].count.value(), 4); // 5, 6, 7, 8
CHECK_EQ(buckets[3].count.value(), 2); // 9, 10
CHECK_EQ(h1.sum(), 55);
}
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