GetCounter.cs

using System.Threading.Tasks;
using Waher.Script;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
using Waher.Script.Objects;
 
namespace Waher.IoTGateway.ScriptExtensions.Functions
{
    public class GetCounter : FunctionOneScalarStringVariable
    {
        public GetCounter(ScriptNode Key, int Start, int Length, Expression Expression)
            : base(Key, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(GetCounter);
 
        public override string[] DefaultArgumentNames => new string[] { "Key" };
 
        public override bool IsAsynchronous => true;
 
        public override IElement EvaluateScalar(string Argument, Variables Variables)
        {
            return this.EvaluateScalarAsync(Argument, Variables).Result;
        }
 
        public override async Task<IElement> EvaluateScalarAsync(string Argument, Variables Variables)
        {
            long Count = await Runtime.Counters.RuntimeCounters.GetCount(Argument);
 
            return new DoubleNumber(Count);
        }
    }
}