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#pragma once
#include <Common/ErrorCodes.h>
#include <Common/Exception.h>
#include <IO/IResourceManager.h>
#include <boost/noncopyable.hpp>
#include <memory>
#include <mutex>
#include <unordered_map>
namespace DB
{
namespace ErrorCodes
{
extern const int INVALID_SCHEDULER_NODE;
}
class ResourceManagerFactory : private boost::noncopyable
{
public:
static ResourceManagerFactory & instance()
{
static ResourceManagerFactory ret;
return ret;
}
ResourceManagerPtr get(const String & name)
{
std::lock_guard lock{mutex};
if (auto iter = methods.find(name); iter != methods.end())
return iter->second();
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] = [] ()
{
return std::make_shared<TDerived>();
};
}
private:
std::mutex mutex;
using Method = std::function<ResourceManagerPtr()>;
std::unordered_map<String, Method> methods;
};
}
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