/// <summary>
/// Adds an Aika historian service to the specified services container.
/// </summary>
/// <typeparam name="T">The <see cref="IHistorian"/> implementation to use with the <see cref="AikaHistorian"/>.</typeparam>
/// <param name="services">The services container to add the historian service to.</param>
/// <param name="historianFactory">The factory to create the singleton instance of <typeparamref name="T"/> with.</param>
/// <param name="options">The Aika service options.</param>
/// <returns>
/// The <paramref name="services"/> container, to allow chaining.
/// </returns>
public static IServiceCollection AddAikaHistorian <T>(this IServiceCollection services, Func <IServiceProvider, T> historianFactory, AikaServiceOptions options) where T : class, IHistorian
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
services.AddSingleton <TaskRunner>();
services.AddSingleton <IHostedService>(x => x.GetService <TaskRunner>());
services.AddSingleton <ITaskRunner>(x => x.GetService <TaskRunner>());
if (historianFactory == null)
{
services.AddSingleton <IHistorian, T>();
}
else
{
services.AddSingleton <IHistorian, T>(historianFactory);
}
services.AddSingleton <AikaHistorian>();
services.AddSingleton <IHostedService, AikaService>(x => {
var aika = x.GetService <AikaHistorian>();
return(new AikaService(aika, options ?? new AikaServiceOptions(), x.GetService <ILogger <AikaService> >()));
});
return(services);
}
/// <summary>
/// Creates a new <see cref="AikaService"/> object.
/// </summary>
/// <param name="aika">The <see cref="AikaHistorian"/> to initialize.</param>
/// <param name="options">The service options.</param>
/// <param name="logger">The logger for the service.</param>
/// <exception cref="ArgumentNullException"><paramref name="aika"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentNullException"><paramref name="options"/> is <see langword="null"/>.</exception>
internal AikaService(AikaHistorian aika, AikaServiceOptions options, ILogger <AikaService> logger)
{
_aika = aika ?? throw new ArgumentNullException(nameof(aika));
_options = options ?? throw new ArgumentNullException(nameof(options));
_logger = logger;
}
/// <summary>
/// Adds an Aika historian service to the specified services container.
/// </summary>
/// <typeparam name="T">The <see cref="IHistorian"/> implementation to use with the <see cref="AikaHistorian"/>.</typeparam>
/// <param name="services">The services container to add the historian service to.</param>
/// <param name="options">The Aika service options.</param>
/// <returns>
/// The <paramref name="services"/> container, to allow chaining.
/// </returns>
public static IServiceCollection AddAikaHistorian <T>(this IServiceCollection services, AikaServiceOptions options) where T : class, IHistorian
{
return(services.AddAikaHistorian <T>(null, options));
}