ClickHouse/src/Common/EventNotifier.cpp

49 lines
981 B
C++

#include <Common/EventNotifier.h>
#include <Common/Exception.h>
#include <boost/functional/hash.hpp>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
std::unique_ptr<EventNotifier> EventNotifier::event_notifier;
EventNotifier & EventNotifier::init()
{
if (event_notifier)
throw Exception(ErrorCodes::LOGICAL_ERROR, "EventNotifier is initialized twice. This is a bug.");
event_notifier = std::make_unique<EventNotifier>();
return *event_notifier;
}
EventNotifier & EventNotifier::instance()
{
if (!event_notifier)
throw Exception(ErrorCodes::LOGICAL_ERROR, "EventNotifier is not initialized. This is a bug.");
return *event_notifier;
}
void EventNotifier::shutdown()
{
if (event_notifier)
event_notifier.reset();
}
size_t EventNotifier::calculateIdentifier(size_t a, size_t b)
{
size_t result = 0;
boost::hash_combine(result, a);
boost::hash_combine(result, b);
return result;
}
}