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#include <gtest/gtest.h>
#include "blockstore/implementations/caching/cache/PeriodicTask.h"
#include <mutex>
#include <condition_variable>
#include <atomic>
using ::testing::Test;
using std::mutex;
using std::unique_lock;
using std::condition_variable;
using namespace blockstore::caching;
class AtomicCounter {
public:
AtomicCounter(int count): _mutex(), _cv(), _counter(count) {}
void decrease() {
const unique_lock<mutex> lock(_mutex);
--_counter;
_cv.notify_all();
}
void waitForZero() {
unique_lock<mutex> lock(_mutex);
_cv.wait(lock, [this] () {return _counter <= 0;});
}
private:
mutex _mutex;
condition_variable _cv;
int _counter;
};
class PeriodicTaskTest: public Test {
};
TEST_F(PeriodicTaskTest, DoesntDeadlockInDestructorWhenDestructedImmediately) {
const PeriodicTask task([](){}, 1, "test");
}
TEST_F(PeriodicTaskTest, CallsCallbackAtLeast10Times) {
AtomicCounter counter(10);
const PeriodicTask task([&counter](){
counter.decrease();
}, 0.001, "test");
counter.waitForZero();
}
TEST_F(PeriodicTaskTest, DoesntCallCallbackAfterDestruction) {
std::atomic<int> callCount(0);
{
const PeriodicTask task([&callCount](){
callCount += 1;
}, 0.001, "test");
}
const int callCountDirectlyAfterDestruction = callCount;
boost::this_thread::sleep_for(boost::chrono::seconds(1));
EXPECT_EQ(callCountDirectlyAfterDestruction, callCount);
}
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