std::vector<RippleState::pointer> const&
RippleLineCache::getRippleLines (Account const& accountID)
{

    {
        ScopedLockType sl (mLock);

        auto it = mRLMap.find (accountID);
        if (it != mRLMap.end ())
            return it->second;
    }

    // It's not in the cache, so build it
    auto lines = ripple::getRippleStateItems (accountID, mLedger);

    {
        ScopedLockType sl (mLock);

        // We must return a reference to the cached version
        return mRLMap.emplace (accountID, std::move (lines)).first->second;
    }
}