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using System;
using System.Collections.Generic;
using System.Threading;
using sample_dotnet_app.Models;
namespace sample_dotnet_app.Services {
    public interface IValuesService {
        void Store(string value);
        bool Update(long id, string newValue);
        bool Delete(long id);
        bool Retrieve(long id, out object retrieved);
        object RetrieveAll();
    public class SimpleValuesService : IValuesService {
        private Dictionary<long, string> values = new Dictionary<long, string>();
        private long idCounter = 0;
        public void Store(string value) {
            values.Add(Interlocked.Increment(ref idCounter), value);
        public bool Update(long id, string newValue) {
            string existing = null;
            if(!values.TryGetValue(id, out existing)) {
                return false;
            values[id] = newValue;
            return true;
        public bool Delete(long id) {
            return values.Remove(id);
        public bool Retrieve(long id, out object retreived) {
            string mapped = "";
            var success = values.TryGetValue(id, out mapped);
            retreived = success ? mapped : null;
            return success;
        public object RetrieveAll() {
            return values;
    public class DefaultValuesService : IValuesService {
        private Dictionary<long, StoredValue> values = new Dictionary<long, StoredValue>();
        private long idCounter = 0;
        public void Store(string value) {
            var now = DateTime.Now;
            var storedValue = new StoredValue {
                Id = Interlocked.Increment(ref idCounter),
                Value = value,
                Created = now,
                Updated = now
            values.Add(storedValue.Id, storedValue);
        public bool Update(long id, string newValue) {
            StoredValue existing = null;
            var success = values.TryGetValue(id, out existing);
            if(success) {
                existing.Value = newValue;
                existing.Updated = DateTime.Now;
            return success;
        public bool Delete(long id) {
            return values.Remove(id);
        public bool Retrieve(long id, out object retreived) {
            StoredValue found = null;
            var success = values.TryGetValue(id, out found);
            retreived = found;
            return success;
        public object RetrieveAll() {
            return values;

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