ExternalCacheStorageBuilder.h

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#pragma once
#include "AggregateExternalCacheStorage.h"
#include "catapult/exceptions.h"
 
namespace catapult { namespace mongo {
 
    class ExternalCacheStorageBuilder {
    public:
        template<typename TStorage>
        void add(std::unique_ptr<TStorage>&& pStorage) {
            auto id = pStorage->id();
            m_storages.resize(std::max(m_storages.size(), id + 1));
            if (m_storages[id])
                CATAPULT_THROW_INVALID_ARGUMENT_1("storage has already been registered with id", id);
 
            m_storages[id] = std::move(pStorage);
        }
 
        std::unique_ptr<ExternalCacheStorage> build() {
            std::vector<std::unique_ptr<ExternalCacheStorage>> storages;
            for (auto& pStorage : m_storages) {
                if (!!pStorage)
                    storages.push_back(std::move(pStorage));
            }
 
            CATAPULT_LOG(debug) << "creating ExternalCacheStorage with " << storages.size() << " storages";
            return std::make_unique<AggregateExternalCacheStorage>(std::move(storages));
        }
 
    private:
        std::vector<std::unique_ptr<ExternalCacheStorage>> m_storages;
    };
}}