Example of StateDeltaImpl.cs

StateDeltaImpl.cs

class StateDeltaImpl : IAccountStateDelta, IValidatorStateDelta, IGasStateDelta {
        [Pure]
        IReadOnlyList<IValue?> IAccountStateView.GetStates(IReadOnlyList<Address> addresses)
        {
            ActionContext.GetStateTimer.Value?.Start();
            int length = addresses.Count;
            
            // note gas is does not static value
            AddGas(length)
            
            ActionContext.GetStateCount.Value += length;
            IValue?[] values = new IValue?[length];
            var notFoundIndices = new List<int>(length);
            for (int i = 0; i < length; i++)
            {
                Address address = addresses[i];
                if (UpdatedStates.TryGetValue(address, out IValue? updatedValue))
                {
                    values[i] = updatedValue;
                    AddGas(updatedValue.length);
                }
                else
                {
                    notFoundIndices.Add(i);
                }
            }

            if (notFoundIndices.Count > 0)
            {
                IReadOnlyList<IValue?> restValues = StateGetter(
                    notFoundIndices.Select(index => addresses[index]).ToArray());
                foreach ((var v, var i) in notFoundIndices.Select((v, i) => (v, i)))
                {
                    values[v] = restValues[i];
                    AddGas(restValues[i].length);
                }
            }

            ActionContext.GetStateTimer.Value?.Stop();
            return values;
        }

        [Pure]
        long IGasStateView.AddGas(long gas)
        {
            UsedGas += gas;
            if(UsedGas >= GasLimit)
            {
               throw new OutOfGasException();
            }
        }
}