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#pragma once
#include <IO/IResourceManager.h>
#include <IO/SchedulerRoot.h>
#include <IO/Resource/ClassifiersConfig.h>
#include <mutex>
namespace DB
{
/*
* Reads `<resources>` from config at startup and registers them in single `SchedulerRoot`.
* Do not support configuration updates, server restart is required.
*/
class StaticResourceManager : public IResourceManager
{
public:
// Just initialization, any further updates are ignored for the sake of simplicity
// NOTE: manager must be initialized before any acquire() calls to avoid races
void updateConfiguration(const Poco::Util::AbstractConfiguration & config) override;
ClassifierPtr acquire(const String & classifier_name) override;
private:
struct Resource
{
std::unordered_map<String, SchedulerNodePtr> nodes; // by paths
Resource(
const String & name,
EventQueue * event_queue,
const Poco::Util::AbstractConfiguration & config,
const std::string & config_prefix);
};
struct Classifier : public IClassifier
{
Classifier(const StaticResourceManager & manager, const ClassifierDescription & cfg);
ResourceLink get(const String & resource_name) override;
std::unordered_map<String, ResourceLink> resources; // accessible resources by names
};
SchedulerRoot scheduler;
std::unordered_map<String, Resource> resources; // by name
std::unique_ptr<ClassifiersConfig> classifiers;
};
}
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