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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#ifdef ENABLE_METRICS_PREVIEW
# include "opentelemetry/sdk/_metrics/aggregator/counter_aggregator.h"
# include <gtest/gtest.h>
# include <numeric>
# include <thread>
namespace metrics_api = opentelemetry::metrics;
OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace metrics
{
TEST(CounterAggregator, NoUpdates)
{
CounterAggregator<int> alpha(metrics_api::InstrumentKind::Counter);
EXPECT_EQ(alpha.get_checkpoint().size(), 1);
EXPECT_EQ(alpha.get_checkpoint()[0], 0);
alpha.checkpoint();
EXPECT_EQ(alpha.get_checkpoint().size(), 1);
EXPECT_EQ(alpha.get_checkpoint()[0], 0);
}
TEST(CounterAggregator, Update)
{
CounterAggregator<int> alpha(metrics_api::InstrumentKind::Counter);
CounterAggregator<int> beta(metrics_api::InstrumentKind::Counter);
for (int i = 0; i < 123456; i++)
{
alpha.update(1);
}
int sum = 0;
for (int i = 0; i < 100; i++)
{
int tmp = std::rand() % 128;
beta.update(tmp);
sum += tmp;
}
EXPECT_EQ(alpha.get_checkpoint()[0], 0); // checkpoint shouldn't change even with updates
EXPECT_EQ(beta.get_checkpoint()[0], 0);
alpha.checkpoint();
beta.checkpoint();
EXPECT_EQ(alpha.get_checkpoint()[0], 123456);
EXPECT_EQ(beta.get_checkpoint()[0], sum);
alpha.update(15);
alpha.checkpoint();
EXPECT_EQ(alpha.get_checkpoint()[0], 15); // reset to 0 after first checkpoint call
}
// callback update function used to test concurrent calls
void incrementingCallback(Aggregator<int> &agg)
{
for (int i = 0; i < 2000000; i++)
{
agg.update(1);
}
}
TEST(CounterAggregator, Concurrency)
{
CounterAggregator<int> alpha(metrics_api::InstrumentKind::Counter);
// spawn new threads that initiate the callback
std::thread first(incrementingCallback, std::ref(alpha));
std::thread second(incrementingCallback, std::ref(alpha));
first.join();
second.join();
alpha.checkpoint();
// race conditions result in values below 2*2000000
EXPECT_EQ(alpha.get_checkpoint()[0], 2 * 2000000);
}
TEST(CounterAggregator, Merge)
{
CounterAggregator<int> alpha(metrics_api::InstrumentKind::Counter);
CounterAggregator<int> beta(metrics_api::InstrumentKind::Counter);
alpha.merge(beta);
alpha.checkpoint();
EXPECT_EQ(alpha.get_checkpoint()[0], 0); // merge with no updates
for (int i = 0; i < 500; i++)
{
alpha.update(1);
}
for (int i = 0; i < 700; i++)
{
beta.update(1);
}
alpha.merge(beta);
alpha.checkpoint();
EXPECT_EQ(alpha.get_checkpoint()[0], 1200);
// HistogramAggregator gamma(metrics_api::BoundInstrumentKind::BoundValueRecorder);
// ASSERT_THROW(alpha.merge(gamma), AggregatorMismatch);
}
} // namespace metrics
} // namespace sdk
OPENTELEMETRY_END_NAMESPACE
#endif
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