Chris Gillum cgillum

Partner Software Architect at Microsoft. Creator of Azure Durable Functions, Easy Auth, and Dapr Workflow.

cgillum / LRUCache.cs

Last active June 13, 2023 00:14

Simple LRU cache implementation

	public class LRUCache<TKey, TValue>
	{
	readonly int capacity;
	readonly Dictionary<TKey, LinkedListNode<(TKey key, TValue value)>> cache;
	readonly LinkedList<(TKey key, TValue value)> list;
	readonly object syncLock = new object();

	public LRUCache(int capacity)
	{
	this.capacity = capacity;

cgillum / DaprWorkflowParallelTaskChaining.cs

Created February 18, 2023 01:00

Shows how to fan out to a multiple parallel task chaining sequences using simple C# constructs in Dapr Workflow.

	class ParallelTaskChaining : Workflow<string, string>
	{
	public override async Task<string> RunAsync(WorkflowContext context, string input)
	{
	// Fan-out to 10 parallel task chains
	List<Task> parallelChains = new();
	for (int i = 0; i < 10; i++)
	{
	// RunSequence encapsulates the task chain as a single task.
	Task chainTask = RunSequence(context);

cgillum / CodeGen.cs

Last active July 19, 2020 23:59

Convert EventSource to ILogger for DurableTask.AzureStorage

	namespace ConsoleApp1
	{
	using System;
	using System.Collections.Generic;
	using System.Diagnostics.Tracing;
	using System.Linq;
	using System.Reflection;
	using DurableTask.AzureStorage;
	using Microsoft.CodeAnalysis;
	using Microsoft.CodeAnalysis.CSharp;

cgillum / counter-entity-class.cs

Last active May 24, 2019 00:33

Example of "counter" entity written as a C# class

	public class CounterEntity
	{
	[JsonProperty("value")]
	public int CurrentValue { get; set; }

	public void Add(int amount) => this.CurrentValue += amount;

	public void Reset() => this.CurrentValue = 0;

	public int Get() => this.CurrentValue;

cgillum / counter-entity.cs

Last active May 18, 2019 01:23

Example of "counter" entity in Durable Functions.

	public static async Task Counter(
	[EntityTrigger] IDurableEntityContext ctx)
	{
	int currentValue = ctx.GetState<int>();

	switch (ctx.OperationName)
	{
	case "add":
	int amount = ctx.GetInput<int>();
	currentValue += amount;

cgillum / FetchAccessToken.cs

Created June 9, 2017 19:18

Using on-behalf-of to exchange an id_token for an access_token for MS Graph

	public string FetchAccessToken()
	{
	string idToken = this.Request.Headers["X-MS-TOKEN-AAD-ACCESS-TOKEN"];
	string tokenUrl = Environment.GetEnvironmentVariable("WEBSITE_AUTH_OPENID_ISSUER").TrimEnd('/') + "/oauth2/token";

	var paramBuilder = new StringBuilder();
	paramBuilder.Append("grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer");
	paramBuilder.Append("&client_id=").Append(Environment.GetEnvironmentVariable("WEBSITE_AUTH_CLIENT_ID"));
	paramBuilder.Append("&client_secret=").Append(Environment.GetEnvironmentVariable("WEBSITE_AUTH_CLIENT_SECRET"));
	paramBuilder.Append("&scope=").Append(WebUtility.UrlEncode("https://graph.microsoft.com/user.read"));