oliverbooth.dev/OliverBooth/Services/BlogUserService.cs

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using System.Collections.Concurrent;
using System.Diagnostics.CodeAnalysis;
using Microsoft.EntityFrameworkCore;
using OliverBooth.Common.Data.Blog;
using OliverBooth.Common.Services;
using OliverBooth.Data.Blog;
namespace OliverBooth.Services;
/// <summary>
/// Represents an implementation of <see cref="IBlogUserService" />.
/// </summary>
internal sealed class BlogUserService : IBlogUserService
{
private readonly IDbContextFactory<BlogContext> _dbContextFactory;
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private readonly ConcurrentDictionary<Guid, IUser> _userCache = new();
/// <summary>
/// Initializes a new instance of the <see cref="BlogUserService" /> class.
/// </summary>
/// <param name="dbContextFactory">
/// The <see cref="IDbContextFactory{TContext}" /> used to create a <see cref="BlogContext" />.
/// </param>
public BlogUserService(IDbContextFactory<BlogContext> dbContextFactory)
{
_dbContextFactory = dbContextFactory;
}
/// <inheritdoc />
public bool TryGetUser(Guid id, [NotNullWhen(true)] out IUser? user)
{
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if (_userCache.TryGetValue(id, out user)) return true;
using BlogContext context = _dbContextFactory.CreateDbContext();
user = context.Users.Find(id);
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if (user is not null) _userCache.TryAdd(id, user);
return user is not null;
}
}