/// <summary>
/// Performs validation of the <paramref name="rules"/>.
/// </summary>
/// <param name="rules"> The set of retention rules to validate. </param>
public void Validate([NotNull, ItemNotNull] IReadOnlyCollection <RetentionRule> rules)
{
AssertArg.NotNullOrEmpty(rules, nameof(rules));
AssertArg.NoNullItems(rules, nameof(rules));
AssertNoDuplicates(rules);
AssertNoContradictions(rules);
}
/// <summary>
/// Initializes a new instance of the <see cref="AppConfig"/> class.
/// </summary>
/// <param name="cleanupDirectoryPath">
/// The path to the directory to cleanup.
/// </param>
/// <param name="retentionRules">
/// The sequence of retention rules.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="cleanupDirectoryPath"/> is <see langword="null"/> or empty or whitespace or
/// <paramref name="retentionRules"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="retentionRules"/> contains a <see langword="null"/> item.
/// </exception>
public AppConfig(
[NotNull] string cleanupDirectoryPath,
[NotNull, ItemNotNull] IReadOnlyCollection <RetentionRule> retentionRules)
{
AssertArg.NotNullOrWhiteSpace(cleanupDirectoryPath, nameof(cleanupDirectoryPath));
AssertArg.NotNull(retentionRules, nameof(retentionRules));
AssertArg.NoNullItems(retentionRules, nameof(retentionRules));
CleanupDirectoryPath = cleanupDirectoryPath;
RetentionRules = retentionRules.ToReadOnlyList();
}
/// <summary>
/// Initializes a new instance of the <see cref="RetentionPolicy" /> class.
/// </summary>
/// <param name="rules">
/// The collection of rules that define the policy.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="rules"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentException">
/// Any item in the <paramref name="rules"/> is <see langword="null"/> or
/// <paramref name="rules"/> is empty or
/// <paramref name="rules"/> contains duplicate or mutually contradictory items.
/// </exception>
public RetentionPolicy([NotNull, ItemNotNull] IReadOnlyCollection <RetentionRule> rules)
{
AssertArg.NotNullOrEmpty(rules, nameof(rules));
AssertArg.NoNullItems(rules, nameof(rules));
Validator.Validate(rules);
_orderedRules = rules
.OrderBy(r => r.OlderThan)
.ToReadOnlyList();
}
/// <summary>
/// Finds expired resources among the <paramref name="resources"/> specified.
/// </summary>
/// <typeparam name="T"> The type of an identifier of a resource. </typeparam>
/// <param name="resources">The sequence resources.</param>
/// <returns> The sequence of identifiers of expired resources. </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="resources"/> is <see langword="null"/>.
/// </exception>
public IEnumerable <T> FindExpiredResources <T>(IReadOnlyCollection <IResource <T> > resources)
{
AssertArg.NotNull(resources, nameof(resources));
AssertArg.NoNullItems(resources, nameof(resources));
var orderedResources = resources.OrderBy(i => i.Age).ToArray();
var examineScopeStartIndex = 0;
var examineScopeLength = orderedResources.Length;
foreach (var rule in _orderedRules)
{
if (examineScopeLength <= 0)
{
break;
}
var examineScopeResources = orderedResources
.Skip(examineScopeStartIndex)
.Take(examineScopeLength)
.ToArray();
var outOfRuleCount = examineScopeResources
.TakeWhile(i => i.Age <= rule.OlderThan)
.Count();
var retainCount = examineScopeResources
.Skip(outOfRuleCount)
.Take(rule.AllowedAmount)
.Count();
examineScopeStartIndex += outOfRuleCount;
examineScopeLength = retainCount;
}
var totalRetainCount =
examineScopeStartIndex +
examineScopeLength;
return(orderedResources
.Skip(totalRetainCount)
.Select(i => i.Id));
}
