EnvelopeGenerator/EnvelopeGenerator.ServiceHost/Jobs/LicenseManagerFactory.cs

using EnvelopeGenerator.Application.ThirdPartyModules.Queries;
using GdPicture14;
using MediatR;
using Microsoft.Extensions.Caching.Memory;

namespace EnvelopeGenerator.ServiceHost.Jobs;

public class LicenseManagerFactory
{
    private static readonly string _cacheKey = Guid.NewGuid().ToString();
    private readonly IServiceScopeFactory scopeFactory;
    private readonly IMemoryCache cache;

    public LicenseManagerFactory(IServiceScopeFactory scopeFactory, IMemoryCache cache)
    {
        this.scopeFactory = scopeFactory;
        this.cache = cache;
        _ = CreateAsync(); // Preload the license key into the cache
    }

    public async Task<LicenseManager> CreateAsync(CancellationToken cancellationToken = default)
    {
        var key = await GetLicenseKeyAsync(cancellationToken);
        var licenseManager = new LicenseManager();
        licenseManager.RegisterKEY(key);
        return licenseManager;
    }

    public async Task<string> GetLicenseKeyAsync(CancellationToken cancellationToken = default)
    {
        return await cache.GetOrCreateAsync(_cacheKey, async entry =>
        {
            entry.Priority = CacheItemPriority.NeverRemove;
            using var scope = scopeFactory.CreateScope();
            var mediator = scope.ServiceProvider.GetRequiredService<IMediator>();
            return await mediator.Send(new ReadThirdPartyModuleLicenseQuery { Name = "GdPicture", Active =true }, cancellationToken);
        }) ?? throw new InvalidOperationException("License key could not be retrieved.");
    }
}