Add .NET Isolated Durable Entities sample

samples/isolated-entities/Chirper/.gitignore

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+# Build output
+bin/
+obj/
+
+# User-specific files
+*.user
+*.suo
+
+# Azure Functions local settings
+local.settings.json
+
+# Visual Studio cache
+.vs/

samples/isolated-entities/Chirper/Chirper.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
+    <OutputType>Exe</OutputType>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />
+    <PackageReference Include="Microsoft.ApplicationInsights.WorkerService" VersionOverride="2.23.0" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker" VersionOverride="2.1.0" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker.Core" VersionOverride="2.1.0" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker.ApplicationInsights" VersionOverride="2.0.0" />
+    <ProjectReference Include="..\..\..\src\Worker.Extensions.DurableTask\Worker.Extensions.DurableTask.csproj" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" VersionOverride="2.0.2" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" VersionOverride="2.0.5" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="System.Threading.ExecutionContext" Alias="ExecutionContext"/>
+  </ItemGroup>
+
+</Project>

samples/isolated-entities/Chirper/Entities/IUserChirps.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Chirper
+{
+    public interface IUserChirps
+    {
+        void Add(Chirp chirp);
+
+        void Remove(DateTime timestamp);
+
+        Task<List<Chirp>> Get();
+    }
+}

samples/isolated-entities/Chirper/Entities/IUserFollows.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Chirper
+{
+    public interface IUserFollows
+    {
+        void Add(string user);
+
+        void Remove(string user);
+
+        Task<List<string>> Get();
+    }
+}

samples/isolated-entities/Chirper/Entities/UserChirps.cs

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+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+using Microsoft.Azure.Functions.Worker;
+using Newtonsoft.Json;
+
+namespace Chirper
+{
+    // The UserChirps entity stores all the chirps by ONE user.
+    // The entity key is the userId.
+
+    [JsonObject(MemberSerialization = MemberSerialization.OptIn)]
+    public class UserChirps : IUserChirps
+    {
+        [JsonProperty]
+        public List<Chirp> Chirps { get; set; } = new List<Chirp>();
+
+        public void Add(Chirp chirp)
+        {
+            Chirps.Add(chirp);
+        }
+
+        public void Remove(DateTime timestamp)
+        {
+            Chirps.RemoveAll(chirp => chirp.Timestamp == timestamp);
+        }
+
+        public Task<List<Chirp>> Get()
+        {
+            return Task.FromResult(Chirps);
+        }
+
+        // Boilerplate (entry point for the functions runtime)
+        [Function(nameof(UserChirps))]
+        public static Task HandleEntityOperation([EntityTrigger] TaskEntityDispatcher context)
+        {
+            return context.DispatchAsync<UserChirps>();
+        }
+    }
+}

samples/isolated-entities/Chirper/Entities/UserFollows.cs

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+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+using Microsoft.Azure.Functions.Worker;
+using Newtonsoft.Json;
+
+namespace Chirper
+{
+    // The UserFollows entity stores all the follows of ONE user.
+    // The entity key is the userId.
+
+    [JsonObject(MemberSerialization = MemberSerialization.OptIn)]
+    public class UserFollows : IUserFollows
+    {
+        [JsonProperty]
+        public List<string> FollowedUsers { get; set; }  = new List<string>();
+
+        public void Add(string user)
+        {
+            FollowedUsers.Add(user);
+        }
+
+        public void Remove(string user)
+        {
+            FollowedUsers.Remove(user);
+        }
+
+        public Task<List<string>> Get()
+        {
+            return Task.FromResult(FollowedUsers);
+        }
+
+        // Boilerplate (entry point for the functions runtime)
+        [Function(nameof(UserFollows))]
+        public static Task HandleEntityOperation([EntityTrigger] TaskEntityDispatcher context)
+        {
+            return context.DispatchAsync<UserFollows>();    
+        }
+    }
+}

samples/isolated-entities/Chirper/Orchestrations/GetTimeline.cs

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+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+using Microsoft.Azure.Functions.Worker;
+using Microsoft.DurableTask;
+using Microsoft.DurableTask.Entities;
+
+namespace Chirper
+{
+    // The GetTimeline orchestration collects all chirps by followed users,
+    // and returns it as a list sorted by timestamp.
+    public static class GetTimeline
+    {
+        [Function(nameof(GetTimeline))]
+        public static async Task<Chirp[]> RunOrchestrator(
+            [OrchestrationTrigger] TaskOrchestrationContext context)
+        {
+            var userId = context.GetInput<string>();
+
+            // call the UserFollows entity to figure out whose chirps should be included
+            var userFollowsId = new EntityInstanceId(nameof(UserFollows), userId);
+            var followedUsers = await context.Entities.CallEntityAsync<List<string>>(userFollowsId, "Get");
+
+
+            // in parallel, collect all the chirps
+            var tasks = followedUsers
+            .Select(id =>
+            {
+                var userChirpsId = new EntityInstanceId(nameof(UserChirps), id);
+                return context.Entities.CallEntityAsync<List<Chirp>>(userChirpsId, "Get");
+            })
+            .ToList();
+
+            await Task.WhenAll(tasks);
+
+            // combine and sort the returned lists of chirps
+            var sortedResults = tasks
+                .SelectMany(task => task.Result)
+                .OrderBy(chirp => chirp.Timestamp);
+
+            return sortedResults.ToArray();
+        }
+    }
+}

samples/isolated-entities/Chirper/Program.cs

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+using Microsoft.Azure.Functions.Worker;
+using Microsoft.Azure.Functions.Worker.Builder;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
+var builder = FunctionsApplication.CreateBuilder(args);
+
+builder.ConfigureFunctionsWebApplication();
+
+builder.Services
+    .AddApplicationInsightsTelemetryWorkerService()
+    .ConfigureFunctionsApplicationInsights();
+
+builder.Build().Run();

samples/isolated-entities/Chirper/Properties/serviceDependencies.json

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+{
+  "dependencies": {
+    "appInsights1": {
+      "type": "appInsights"
+    },
+    "storage1": {
+      "type": "storage",
+      "connectionId": "AzureWebJobsStorage"
+    }
+  }
+}

samples/isolated-entities/Chirper/Properties/serviceDependencies.local.json

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+{
+  "dependencies": {
+    "appInsights1": {
+      "type": "appInsights.sdk"
+    },
+    "storage1": {
+      "type": "storage.emulator",
+      "connectionId": "AzureWebJobsStorage"
+    }
+  }
+}

samples/isolated-entities/Chirper/PublicRest/Chirp.cs

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+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+
+namespace Chirper
+{
+    /// <summary>
+    /// A data structure representing a chirp.
+    /// </summary>
+    [JsonObject(MemberSerialization.OptOut)]
+    public struct Chirp
+    {
+        public string UserId { get; set; }
+
+        public DateTime Timestamp { get; set; }
+
+        public string Content { get; set; }
+    }
+}