ConsistencyConfig.cs

// ------------------------------------------------------------
// Copyright (c) Microsoft Corporation.  All rights reserved.
// ------------------------------------------------------------

namespace Microsoft.Azure.Cosmos.Tracing.TraceData
{
    using System;
    using System.Collections.Generic;
    using System.Globalization;

    internal class ConsistencyConfig
    {
        public ConsistencyConfig(
            ConsistencyLevel? consistencyLevel,
            IReadOnlyList<string> preferredRegions,
            string applicationRegion)
        {
            this.ConsistencyLevel = consistencyLevel;
            this.PreferredRegions = preferredRegions;
            this.ApplicationRegion = applicationRegion;
            this.lazyString = new Lazy<string>(() => string.Format(CultureInfo.InvariantCulture,
                                "(consistency: {0}, prgns:[{1}], apprgn: {2})",
                                consistencyLevel?.ToString() ?? "NotSet",
                                ConsistencyConfig.PreferredRegionsInternal(preferredRegions),
                                applicationRegion));
            this.lazyJsonString = new Lazy<string>(() => Newtonsoft.Json.JsonConvert.SerializeObject(this));
        }

        public ConsistencyLevel? ConsistencyLevel { get; }
        public IReadOnlyList<string> PreferredRegions { get; }
        public string ApplicationRegion { get; }

        private readonly Lazy<string> lazyString;
        private readonly Lazy<string> lazyJsonString;

        public override string ToString()
        {
            return this.lazyString.Value;
        }

        public string ToJsonString()
        {
            return this.lazyJsonString.Value;
        }

        private static string PreferredRegionsInternal(IReadOnlyList<string> applicationPreferredRegions)
        {
            if (applicationPreferredRegions == null)
            {
                return string.Empty;
            }

            return string.Join(", ", applicationPreferredRegions);
        }
    }
}