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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 <vespa/config/common/timingvalues.h>
#include <vespa/config/helper/ifetchercallback.h>
#include <vespa/config/subscription/sourcespec.h>
#include <atomic>
#include <thread>
namespace config {
class ConfigPoller;
class IConfigContext;
/**
* A config fetcher subscribes to a config and notifies a callback when done
*/
class ConfigFetcher
{
public:
ConfigFetcher(std::shared_ptr<IConfigContext> context);
ConfigFetcher(const SourceSpec & spec = ServerSpec());
~ConfigFetcher();
template <typename ConfigType>
void subscribe(const std::string & configId, IFetcherCallback<ConfigType> * callback, vespalib::duration subscribeTimeout = DEFAULT_SUBSCRIBE_TIMEOUT);
void start();
void close();
int64_t getGeneration() const;
private:
std::unique_ptr<ConfigPoller> _poller;
std::thread _thread;
std::atomic<bool> _closed;
std::atomic<bool> _started;
};
} // namespace config
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