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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <atomic>
#include <condition_variable>
#include <mutex>
#include <vespa/vespalib/metrics/clock.h>
#include <vespa/vespalib/testkit/test_kit.h>
namespace vespalib::metrics {
// used to test clients of the Tick interface
// values shared between threads are bounded queues with max size 1
class MockTick : public Tick {
private:
using Guard = std::unique_lock<std::mutex>;
struct Value {
Value() noexcept : value(0.0), valid(false) {}
TimeStamp value;
bool valid;
};
TimeStamp _first_value;
std::mutex _lock;
std::condition_variable _cond;
bool _alive;
Value _prev;
Value _next;
void push(Value &dst, TimeStamp value) {
Guard guard(_lock);
while (_alive && dst.valid) {
_cond.wait(guard);
}
dst.value = value;
dst.valid = true;
_cond.notify_one();
}
TimeStamp pop(Value &src) {
Guard guard(_lock);
while (_alive && !src.valid) {
_cond.wait(guard);
}
src.valid = false;
_cond.notify_one();
return src.value;
}
TimeStamp peek(const Value &src) {
Guard guard(_lock);
while (_alive && !src.valid) {
_cond.wait(guard);
}
return src.value;
}
public:
explicit MockTick(TimeStamp first_value) noexcept
: _first_value(first_value), _lock(), _cond(), _alive(true), _prev(), _next() {}
TimeStamp first() override { return _first_value; }
TimeStamp next(TimeStamp prev) override {
push(_prev, prev);
return pop(_next);
}
TimeStamp give(TimeStamp next_value) {
TimeStamp prev_value = pop(_prev);
push(_next, next_value);
EXPECT_EQUAL(peek(_prev).count(), next_value.count());
return prev_value;
}
bool alive() const override { return _alive; }
void kill() override {
Guard guard(_lock);
_alive = false;
_cond.notify_all();
}
};
// share the MockTick between the tested and the tester.
class TickProxy : public Tick {
private:
std::shared_ptr<Tick> _tick;
public:
explicit TickProxy(std::shared_ptr<Tick> tick) noexcept : _tick(std::move(tick)) {}
TimeStamp first() override { return _tick->first(); }
TimeStamp next(TimeStamp prev) override { return _tick->next(prev); }
bool alive() const override { return _tick->alive(); }
void kill() override { _tick->kill(); }
};
} // namespace vespalib::metrics
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