namespace_uuid_cache.h

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#pragma once

#include "mongo/base/disallow_copying.h"
#include "mongo/db/catalog/collection_options.h"
#include "mongo/db/operation_context.h"
#include "mongo/util/string_map.h"
#include "mongo/util/uuid.h"

namespace mongo {

extern bool debugCollectionUUIDs;

using CollectionUUID = UUID;
class Database;

class NamespaceUUIDCache {
    MONGO_DISALLOW_COPYING(NamespaceUUIDCache);

public:
    static const OperationContext::Decoration<NamespaceUUIDCache> get;
    NamespaceUUIDCache() = default;

    void ensureNamespaceInCache(const NamespaceString& nss, CollectionUUID uuid);

    void evictNamespace(const NamespaceString& nss);

    void evictNamespacesInDatabase(StringData dbname);

    void verifyNotCached(const NamespaceString& nss, CollectionUUID uuid) {
        auto it = _cache.find(nss.ns());
        invariant(it == _cache.end() || it->second != uuid);
    }

private:
    using CollectionUUIDMap = StringMap<CollectionUUID>;
    CollectionUUIDMap _cache;
};
}  // namespace mongo