/// <summary>
/// Finds out expired resources in the <paramref name="resourceStorage"/> and deletes them.
/// </summary>
/// <typeparam name="T"> The type of an identifier of a resource. </typeparam>
/// <param name="resourceStorage">
/// The storage where to perform cleanup in.
/// </param>
/// <param name="expirationPolicy">
/// The resource expiration policy.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="resourceStorage"/> is <see langword="null"/> or
/// <paramref name="expirationPolicy"/> is <see langword="null"/>.
/// </exception>
public async Task ExecuteStorageCleanup <T>(
[NotNull] IResourceStorage <T> resourceStorage,
[NotNull] IResourceExpirationPolicy expirationPolicy)
{
AssertArg.NotNull(resourceStorage, nameof(resourceStorage));
AssertArg.NotNull(expirationPolicy, nameof(expirationPolicy));
_log?.Debug($"Calling {resourceStorage.GetType().Name} storage for resource details.");
var resources = (await resourceStorage.GetResourceDetails()).ToArray();
_log?.Debug($"Fetched details about {resources.Length} resources.");
var resourceIdsToDelete = expirationPolicy
.FindExpiredResources(resources)
.ToArray();
if (!resourceIdsToDelete.Any())
{
_log?.Info("No expired resources were found thus no resource is deleted.");
return;
}
_log?.Debug($"Calling {resourceStorage.GetType().Name} storage for expired resources deletion.");
await resourceStorage.DeleteResources(resourceIdsToDelete);
_log?.Debug($"Deleted {resourceIdsToDelete.Length} expired resources.");
}
/// <summary>
/// Initializes a new instance of the <see cref="App{T}" /> class.
/// </summary>
/// <param name="cleanupExecutor">
/// The executor of cleanup of the <paramref name="storage"/>.
/// </param>
/// <param name="storage">
/// The storage to be cleanup up.
/// </param>
/// <param name="expirationPolicy">
/// The resource expiration policy.
/// </param>
/// <param name="log">
/// The log where to write messages to.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="cleanupExecutor"/> is <see langword="null"/> or
/// <paramref name="storage"/> is <see langword="null"/> or
/// <paramref name="expirationPolicy"/> is <see langword="null"/> or
/// <paramref name="log"/> is <see langword="null"/>.
/// </exception>
public App(
[NotNull] CleanupExecutor cleanupExecutor,
[NotNull] IResourceStorage <T> storage,
[NotNull] IResourceExpirationPolicy expirationPolicy,
[NotNull] ILog log)
{
AssertArg.NotNull(cleanupExecutor, nameof(cleanupExecutor));
AssertArg.NotNull(storage, nameof(storage));
AssertArg.NotNull(expirationPolicy, nameof(expirationPolicy));
AssertArg.NotNull(log, nameof(log));
_cleanupExecutor = cleanupExecutor;
_storage = storage;
_expirationPolicy = expirationPolicy;
_log = log;
}