Added database storage descriptors

Author: jeremydmiller

src/JasperFx.Core.Tests/JasperFx.Core.Tests.csproj

@@ -4,6 +4,7 @@
         <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
+        <LangVersion>latest</LangVersion>
     </PropertyGroup>
 
     <ItemGroup>

src/JasperFx.Core/Descriptions/DatabaseUsage.cs

@@ -0,0 +1,63 @@
+namespace JasperFx.Core.Descriptions;
+
+public enum DatabaseUsage
+{
+    /// <summary>
+    /// No database usage here of any sort
+    /// </summary>
+    None,
+    
+    /// <summary>
+    /// Using a single database regardless of tenancy
+    /// </summary>
+    Single,
+    
+    /// <summary>
+    /// Using a static number of databases
+    /// </summary>
+    StaticMultiple,
+    
+    /// <summary>
+    /// Using a dynamic number of databases that should
+    /// be expected to potentially change at runtime
+    /// </summary>
+    DynamicMultiple
+}
+
+public class DatabaseCapability : OptionsDescription
+{
+    public DatabaseUsage Usage { get; set; } = DatabaseUsage.Single;
+    
+    // Also holds tenants
+    public List<DatabaseDescription> Databases { get; set; } = [];
+}
+
+public class DatabaseDescription : OptionsDescription
+{
+    /// <summary>
+    /// Identifier within the Wolverine system
+    /// </summary>
+    public string Identifier { get; set; } = "Default";
+    
+    /// <summary>
+    /// Descriptive name for the database engine. Example: "SqlServer" or "PostgreSQL"
+    /// </summary>
+    public string DatabaseEngine { get; set; }
+
+    public List<string> TenantIds { get; set; } = new();
+}
+
+// This definitely goes into JasperFx.Core. Also need a way to 
+// get out tenanted message stores too though. Put something separate
+// in Weasel for multi-tenancy for EF Core that can generate databases
+public interface IDatabaseUser  
+{
+    DatabaseUsage Usage { get; }
+    
+    /// <summary>
+    /// Evaluate the databases used at runtime
+    /// </summary>
+    /// <param name="token"></param>
+    /// <returns></returns>
+    ValueTask<IReadOnlyList<DatabaseDescription>> DescribeDatabasesAsync(CancellationToken token);
+}

src/JasperFx.Core/JasperFx.Core.csproj

@@ -6,6 +6,7 @@
         <Authors>Jeremy D. Miller</Authors>
         <AssemblyName>JasperFx.Core</AssemblyName>
         <PackageId>JasperFx.Core</PackageId>
+        <LangVersion>latest</LangVersion>
 
     </PropertyGroup>
 

src/Widgets1/Widgets1.csproj

@@ -2,6 +2,7 @@
 
     <PropertyGroup>
         <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+        <LangVersion>latest</LangVersion>
     </PropertyGroup>
 
     <ItemGroup>

src/Widgets2/Widgets2.csproj

@@ -2,6 +2,7 @@
 
     <PropertyGroup>
         <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+        <LangVersion>latest</LangVersion>
     </PropertyGroup>
 
     <ItemGroup>

src/Widgets3/Widgets3.csproj

@@ -2,6 +2,7 @@
 
     <PropertyGroup>
         <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+        <LangVersion>latest</LangVersion>
     </PropertyGroup>
 
     <ItemGroup>

src/Widgets4/Widgets4.csproj

@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+        <LangVersion>latest</LangVersion>
     </PropertyGroup>
 
     <ItemGroup>

src/Widgets5/Widgets5.csproj

@@ -2,6 +2,7 @@
 
     <PropertyGroup>
         <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+        <LangVersion>latest</LangVersion>
     </PropertyGroup>
 
     <ItemGroup>