The CachedTopicRepository decorates another ITopicRepository implementation with an in-memory cache. It is recommended that web applications decorate their ITopicRepository implementation.

• Functionality
• Installation
• Usage

When topics are requested, they are pulled from the cache, if they exist; otherwise, they are pulled from the underlying ITopicRepository implementation, and then cached. Similarly, when topics are e.g. saved or moved, the updated versions are persisted to the underlying ITopicRepository, and then updated in the cache.

Installation can be performed by providing a <PackageReference /> to the OnTopic.Data.Caching NuGet package.

<Project Sdk="Microsoft.NET.Sdk.Web">
  …
  <ItemGroup>
    <PackageReference Include="OnTopic.Data.Caching" Version="5.0.0" />
  </ItemGroup>
</Project>

var sqlTopicRepository      = new SqlTopicRepository(connectionString);
var cachedTopicRepository   = new CachedTopicRepository(sqlTopicRepository);
var rootTopic               = cachedTopicRepository.Load();