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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "subscriptionid.h"
#include <vespa/config/common/configkey.h>
#include <vespa/config/common/source.h>
#include <vespa/vespalib/util/time.h>
#include <atomic>
namespace config {
class IConfigHolder;
class ConfigUpdate;
class ConfigValue;
/**
* A subscription can be polled for config updates, and handles interruption of
* the nextUpdate call.
*/
class ConfigSubscription
{
public:
typedef std::unique_ptr<ConfigSubscription> UP;
typedef std::shared_ptr<ConfigSubscription> SP;
ConfigSubscription(const SubscriptionId & id, const ConfigKey & key, std::shared_ptr<IConfigHolder> holder, std::unique_ptr<Source> source);
~ConfigSubscription();
/**
* Fetches the appropriate ConfigValue.
*
* @return the current ConfigValue.
*/
const ConfigValue & getConfig() const;
/**
* Checks whether or not the config has changed.
*
* @return true if changed, false if not.
*/
bool isChanged() const noexcept { return _isChanged; }
/**
* Returns the last generation that actually changed the config.
*/
int64_t getLastGenerationChanged() const noexcept { return _lastGenerationChanged; }
/// Used by ConfigSubscriptionSet
SubscriptionId getSubscriptionId() const noexcept { return _id; }
const ConfigKey & getKey() const noexcept { return _key; }
bool nextUpdate(int64_t generation, vespalib::steady_time deadline);
int64_t getGeneration() const;
bool hasChanged() const;
bool hasGenerationChanged() const;
void flip();
void reset() noexcept { _isChanged = false; }
void close();
// Used by ConfigManager
void reload(int64_t generation);
private:
const SubscriptionId _id;
const ConfigKey _key;
std::unique_ptr<Source> _source;
std::shared_ptr<IConfigHolder> _holder;
std::unique_ptr<ConfigUpdate> _next;
std::unique_ptr<ConfigUpdate> _current;
bool _isChanged;
int64_t _lastGenerationChanged;
std::atomic<bool> _closed;
};
typedef std::vector<ConfigSubscription::SP> SubscriptionList;
} // namespace config
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