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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/fastos/thread.h>
#include <vespa/searchcore/proton/common/doctypename.h>
#include <vespa/vespalib/stllike/string.h>
#include <vespa/config/config.h>
#include "bootstrapconfigmanager.h"
#include "documentdbconfigmanager.h"
#include "i_document_db_config_owner.h"
#include <chrono>
namespace document { class DocumentTypeRepo; }
namespace proton {
class BootstrapConfig;
class IProtonConfigurer;
/**
* A ProtonConfigFetcher monitors all config in proton and document dbs for change
* and starts proton reconfiguration if config has been reloaded.
*/
class ProtonConfigFetcher : public FastOS_Runnable
{
public:
using BootstrapConfigSP = std::shared_ptr<BootstrapConfig>;
ProtonConfigFetcher(const config::ConfigUri & configUri, IProtonConfigurer &owner, uint64_t subscribeTimeout);
~ProtonConfigFetcher();
/**
* Get the current config generation.
*/
int64_t getGeneration() const;
/**
* Start config fetcher, callbacks may come from now on.
*/
void start();
/**
* Shutdown config fetcher, ensuring that no more callbacks arrive
*/
void close();
void Run(FastOS_ThreadInterface * thread, void *arg) override;
private:
typedef std::map<DocTypeName, DocumentDBConfigManager::SP> DBManagerMap;
using Clock = std::chrono::steady_clock;
using TimePoint = std::chrono::time_point<Clock>;
using OldDocumentTypeRepo = std::pair<TimePoint, std::shared_ptr<const document::DocumentTypeRepo>>;
BootstrapConfigManager _bootstrapConfigManager;
config::ConfigRetriever _retriever;
IProtonConfigurer & _owner;
mutable std::mutex _mutex; // Protects maps
using lock_guard = std::lock_guard<std::mutex>;
DBManagerMap _dbManagerMap;
FastOS_ThreadPool _threadPool;
std::deque<OldDocumentTypeRepo> _oldDocumentTypeRepos;
std::shared_ptr<const document::DocumentTypeRepo> _currentDocumentTypeRepo;
void fetchConfigs();
void updateDocumentDBConfigs(const BootstrapConfigSP & config, const config::ConfigSnapshot & snapshot);
void reconfigure();
const config::ConfigKeySet pruneManagerMap(const BootstrapConfigSP & config);
void rememberDocumentTypeRepo(std::shared_ptr<const document::DocumentTypeRepo> repo);
};
} // namespace proton
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