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#pragma once
#include <Common/Stopwatch.h>
#include <IO/ISchedulerQueue.h>
#include <Poco/Util/AbstractConfiguration.h>
#include <deque>
#include <mutex>
namespace DB
{
namespace ErrorCodes
{
extern const int INVALID_SCHEDULER_NODE;
}
/*
* FIFO queue to hold pending resource requests
*/
class FifoQueue : public ISchedulerQueue
{
public:
FifoQueue(EventQueue * event_queue_, const Poco::Util::AbstractConfiguration & config, const String & config_prefix)
: ISchedulerQueue(event_queue_, config, config_prefix)
{}
bool equals(ISchedulerNode * other) override
{
if (auto * o = dynamic_cast<FifoQueue *>(other))
return true;
return false;
}
void enqueueRequest(ResourceRequest * request) override
{
std::unique_lock lock(mutex);
request->enqueue_ns = clock_gettime_ns();
bool was_empty = requests.empty();
requests.push_back(request);
if (was_empty)
scheduleActivation();
}
std::pair<ResourceRequest *, bool> dequeueRequest() override
{
std::unique_lock lock(mutex);
if (requests.empty())
return {nullptr, false};
ResourceRequest * result = requests.front();
requests.pop_front();
return {result, !requests.empty()};
}
bool isActive() override
{
std::unique_lock lock(mutex);
return !requests.empty();
}
void activateChild(ISchedulerNode *) override
{
assert(false); // queue cannot have children
}
void attachChild(const SchedulerNodePtr &) override
{
throw Exception(
ErrorCodes::INVALID_SCHEDULER_NODE,
"Cannot add child to leaf scheduler queue: {}",
getPath());
}
void removeChild(ISchedulerNode *) override
{
}
ISchedulerNode * getChild(const String &) override
{
return nullptr;
}
private:
std::mutex mutex;
std::deque<ResourceRequest *> requests;
};
}
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