Distributed Cache (IDistributedCache) implementation for DynamoDb (AWS)

Setup.

By as project refference

Add the following nugets:

• Microsoft.Extensions.DependencyInjection.Abstraction;
• Microsoft.Extensions.DependencyInjection;
• Microsoft.Extensions.Caching.Abstractions;
• AWSSDK.Core;
• AWSSDK.DynamoDBv2
• Newtonsoft.Json

By Nuget Package.

https://www.nuget.org/packages/Microsoft.Extensions.Caching.Distributed.DynamoDb/

Setup debugging

Add http://srv.symbolsource.org/pdb/Public to Debugging => Symbol in visual studio under Debug => Options

Add check "Enable source server support" in Debugging => General in visual studio under Debug => Options

Un check "Enable .net framework source stepping" in Debugging => General in visual studio under Debug => Options

Registering & using the implementation

//Set up the variables (Load from configuration files)
//Sensitive information can be stored in your deployment pipeline.
var accessKey = "{AWS access key}";
var accessSecret = "{AWS access secret}";
var region = RegionEndpoint.GetBySystemName("eu-west-2");
var encoding = Encoding.GetEncoding("us-ascii");

//Sample data model which is to saved in cache
public class SampleDataModel
{
    public string Id;
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string CompanyName { get; set; }
}

//Sample data to be stored in cache.
var someObject = new SampleDataModel
{
    Id = Guid.NewGuid().ToString(),
    FirstName = "Tom",
    LastName = "Hardy",
    CompanyName = "Microsoft corporation"
};

//Set up the IOC
IServiceCollection serviceCollection = new ServiceCollection();

//Register caching
serviceCollection.RegisterDynomoDbCacheService(new DistributedCacheDynamoDbSettings(accessKey, accessSecret, encoding, region));

//Register repository
serviceCollection.Add(new ServiceDescriptor(typeof(ISampleRepository), typeof(SampleRepository), ServiceLifetime.Transient));

//Initialize the IOC
_serviceProvider = serviceCollection.BuildServiceProvider();

//Get the cache instance
var _distributedCache = _serviceProvider.GetService<IDistributedCache>();
 
//Save to cache
_distributedCache.SetObject(model.Id, model);
 
//Read from cache
_distributedCache.GetObject<SampleDataModel>(id); 
 

The above will create a default cache table in DynamoDb and store the information.

If the requirement is there to create custom cache tables then

//Custom cache table

public class CustomCacheTable : ICacheTable
{
    public string CacheId { get; set; }
    public string Value { get; set; }
    public long Ttl { get; set; }
    public CacheOptions CacheOptions { get; set; }
}

[CustomCacheTable] is your table name.

Simply create an implementation of "ICacheTable"

Than during registration use the following.

serviceCollection.RegisterDynomoDbCacheService<CustomCacheTable>(new DistributedCacheDynamoDbSettings(accessKey, accessSecret, encoding, region));

instead of

serviceCollection.RegisterDynomoDbCacheService(new DistributedCacheDynamoDbSettings(accessKey, accessSecret, encoding, region));