JD2022-TU1/main/tools/services/JD.Adobe.Service/TargetMemories/SimpleTargetMemory.cs

using System;
using Plume.Core.Logging;
using Shuttle.Servers;

namespace JD.Adobe.Service.TargetMemories
{
    public class SimpleTargetMemory : ITargetMemory
    {
        protected ILogger Logger { get; }

        public event Action<TargetAppInfo> OnTargetChanged;

        public bool HasTarget => Target != TargetAppInfo.Empty;

        public TargetAppInfo Target { get; private set; }

        public SimpleTargetMemory(ILogger logger)
        {
            Logger = logger ?? throw new ArgumentNullException(nameof(logger));
            
            Target = TargetAppInfo.Empty;
        }

        public void SetTarget(TargetAppInfo target)
        {
            if (target == null)
            {
                throw new ArgumentNullException(nameof(target));
            }

            if (target.ConnectionId == null)
            {
                throw new ArgumentException($"Cannot set target because property '{nameof(target.ConnectionId)}' of {target.GetType().Name} was null.", nameof(target));
            }

            Logger.Debug($"Attempting to memorize target '{target.ShuttleId} ({target.ConnectionId})'...");

            if (target.Equals(Target))
            {
                Logger.Debug($"'{target.ShuttleId} ({target.ConnectionId})' was already the target.");
                return;
            }

            Target = target;

            Logger.Debug($"'{target.ShuttleId} ({target.ConnectionId})' was internally set as the target. Raising event...");
            OnTargetChanged?.Invoke(Target);

            Logger.Debug($"Done setting '{target.ShuttleId} ({target.ConnectionId})' as the new target!");
        }

        public void ClearTarget()
        {
            SetTarget(TargetAppInfo.Empty);
        }
    }
}