/// <summary>
/// Generates a reference to an object.
/// </summary>
/// <typeparam name="T">The type of the object.</typeparam>
/// <param name="instance">The <typeparamref name="T"/>
/// being referred to.</param>
/// <returns>The <see cref="ObjectReference"/> that specifies
/// <paramref name="instance"/>.</returns>
/// <exception cref="ArgumentNullException">
/// <para><paramref name="instance"/> is <see langword="null"/>.</para>
/// </exception>
public static ObjectReference CreateReference <T>(T instance) where T : ICacheParameter
{
TypeStatic <T> .AssertNotNull("instance", instance);
return(new ObjectReference(GetKeySpace(instance, null),
CacheTypeStatic <T> .GetKey(instance)));
}
/// <summary>
/// Deletes a cached object.
/// </summary>
/// <typeparam name="T">The type of the object.</typeparam>
/// <param name="instance">Required. The object to refresh.</param>
/// <returns><see langword="true"/> if the object existed prior, otherwise
/// <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException">
/// <para><paramref name="instance"/> is <see langword="null"/>.</para>
/// </exception>
public static bool Delete <T>(T instance) where T : ICacheParameter
{
TypeStatic <T> .AssertNotNull("instance", instance);
return(Delete(
GetKeySpace(instance, null),
CacheTypeStatic <T> .GetKey(instance)));
}
/// <summary>
/// Gets the expiration time of a cached object.
/// </summary>
/// <typeparam name="T">The type of the object.</typeparam>
/// <param name="instance">Required. The object to refresh.</param>
/// <returns>A <see cref="Nullable{DateTime}"/> containing the expiration
/// time if found; otherwise <see langword="null"/>.</returns>
/// <exception cref="ArgumentNullException">
/// <para><paramref name="instance"/> is <see langword="null"/>.</para>
/// </exception>
public static DateTime?GetExpires <T>(T instance) where T : ICacheParameter
{
TypeStatic <T> .AssertNotNull("instance", instance);
return(GetExpires(
GetKeySpace(instance, null),
CacheTypeStatic <T> .GetKey(instance)));
}
/// <summary>
/// Generates a array of references to an array of objects.
/// </summary>
/// <typeparam name="T">The type of the objects.</typeparam>
/// <param name="instances">The <typeparamref name="T"/> array
/// being referred to.</param>
/// <returns>The array of <see cref="ObjectReference"/>s that
/// contains references specified by <paramref name="instances"/>.</returns>
/// <exception cref="ArgumentNullException">
/// <para><paramref name="instances"/> is <see langword="null"/>.</para>
/// </exception>
public static ObjectReference[] CreateReferences <T>(params T[] instances) where T : ICacheParameter
{
if (instances == null)
{
throw new ArgumentNullException("instances");
}
var ret = new ObjectReference[instances.Length];
var idx = 0;
foreach (var instance in instances)
{
ret[idx] = new ObjectReference(GetKeySpace(instance, null),
CacheTypeStatic <T> .GetKey(instance));
++idx;
}
return(ret);
}
/// <summary>
/// Stores an object to cache.
/// </summary>
/// <typeparam name="T">The type of the object.</typeparam>
/// <param name="instance">Required. The object to store.</param>
/// <param name="options">The <see cref="LocalCacheOptions"/> to use for this
/// operation.</param>
/// <returns>The <see cref="StorageEntry{T}"/> containing the data
/// saved. <see cref="StorageEntry{T}.NotFound"/> if local caching is disabled.</returns>
/// <exception cref="ArgumentNullException">
/// <para><paramref name="instance"/> is <see langword="null"/>.</para>
/// </exception>
/// <exception cref="ArgumentException">
/// <para><see cref="LocalCacheOptions.Updated"/> of <paramref name="options"/>
/// has a value specified, which is not allowed for the cache type of
/// <typeparamref name="T"/>.</para>
/// </exception>
public static StorageEntry <T> Save <T>(T instance, LocalCacheOptions options)
where T : ICacheParameter
{
if (!IsLocalCachingConfigured())
{
return(StorageEntry <T> .NotFound);
}
TypeStatic <T> .AssertNotNull("instance", instance);
DateTime?updated = null;
if (CacheTypeStatic <T> .IsExtendedCache)
{
var ext = (IExtendedCacheParameter)instance;
updated = ext.LastUpdatedDate;
}
else if (CacheTypeStatic <T> .IsExtendedRawCache)
{
var extRaw = (IExtendedRawCacheParameter)instance;
updated = extRaw.LastUpdatedDate;
}
if (updated.HasValue)
{
if (options.Updated.HasValue && updated.Value !=
options.Updated.Value)
{
ThrowUpdatedDateTimeNotAllowed();
}
}
else
{
updated = options.Updated ?? DateTime.Now;
}
var key = CacheTypeStatic <T> .GetKey(instance);
var entry = new StorageEntry <T>(instance, updated.Value,
GetRefreshExpires(instance, null));
var typeId = GetKeySpace(instance, null);
_storage.Put(typeId, key, entry);
SaveDependencies(typeId, key, updated.Value, options.ContentDependencies,
options.ExistenceDependencies);
return(entry);
}
/// <summary>
/// Gets the key corresponding to an object.
/// </summary>
/// <typeparam name="T">The type of <paramref name="instance"/>.</typeparam>
/// <param name="instance">The object.</param>
/// <returns>The <see cref="StorageKey"/> identifier key.</returns>
/// <exception cref="ArgumentNullException">
/// <para><paramref name="instance"/> is <see langword="null"/>.</para>
/// </exception>
public static StorageKey GetKey <T>(T instance) where T : ICacheParameter
{
TypeStatic <T> .AssertNotNull("instance", instance);
return(CacheTypeStatic <T> .GetKey(instance));
}