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#pragma once
#include <Common/ErrorCodes.h>
#include <Common/Exception.h>
#include <IO/ISchedulerNode.h>
#include <Poco/Util/AbstractConfiguration.h>
#include <boost/noncopyable.hpp>
#include <memory>
#include <mutex>
#include <unordered_map>
namespace DB
{
namespace ErrorCodes
{
extern const int INVALID_SCHEDULER_NODE;
}
class SchedulerNodeFactory : private boost::noncopyable
{
public:
static SchedulerNodeFactory & instance()
{
static SchedulerNodeFactory ret;
return ret;
}
SchedulerNodePtr get(const String & name, EventQueue * event_queue, const Poco::Util::AbstractConfiguration & config, const String & config_prefix)
{
std::lock_guard lock{mutex};
if (auto iter = methods.find(name); iter != methods.end())
return iter->second(event_queue, config, config_prefix);
throw Exception(ErrorCodes::INVALID_SCHEDULER_NODE, "Unknown scheduler node type: {}", name);
}
template <class TDerived>
void registerMethod(const String & name)
{
std::lock_guard lock{mutex};
methods[name] = [] (EventQueue * event_queue, const Poco::Util::AbstractConfiguration & config, const String & config_prefix)
{
return std::make_shared<TDerived>(event_queue, config, config_prefix);
};
}
private:
std::mutex mutex;
using Method = std::function<SchedulerNodePtr(EventQueue * event_queue, const Poco::Util::AbstractConfiguration & config, const String & config_prefix)>;
std::unordered_map<String, Method> methods;
};
}
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