/// <summary>Retrive immutable objects.</summary>
/// <typeparam name="T">Type of presisted value.</typeparam>
/// <param name="checksum">Checksum of value to get.</param>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
public async Task <StoreResult <T> > TryGetAsync <T>(Checksum checksum)
{
if (checksum == null)
{
throw new ArgumentNullException(nameof(checksum));
}
if (this.cache.TryGet <T>(checksum, out var cacheValue))
{
return(cacheValue);
}
foreach (var store in this.storages)
{
var result = await store.TryGetAsync(checksum).ConfigureAwait(false);
if (result.Contains)
{
var value = (T)this.formatter.Deserialize(result.GetStream());
StoreResult <T> storeResult = new Persisted <T>(value, this, checksum);
return(this.cache.AddOrGet(storeResult));
}
}
throw new DoesNotContainValueException(checksum);
}
#pragma warning restore CA2225
/// <inheritdoc/>
public bool Equals(Persisted <T> other)
{
if (other == null)
{
return(false);
}
return(this.Checksum.Equals(other.Checksum));
}
/// <summary>Initializes a new instance of the <see cref="StoreResult{T}"/> class.</summary>
/// <param name="contains">True if contains value.</param>
/// <param name="presistedValue">Valus that was presisted.</param>
/// <exception cref="ArgumentNullException">Throws <see cref="ArgumentNullException"/> if contains is true and value is null.</exception>
public StoreResult(bool contains, Persisted <T> presistedValue)
{
if (contains && presistedValue == null)
{
throw new ArgumentNullException(nameof(presistedValue));
}
this.contains = contains;
this.presistedValue = presistedValue;
}
/// <summary>Presists immutable objects, and returns link to object.</summary>
/// <typeparam name="T">Type of presisted value.</typeparam>
/// <param name="value">Value to ensure is presisted in store.</param>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
public async Task <Persisted <T> > EnsurePresistAsync <T>(T value)
{
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
this.ImmutableValidator.EnsureImmutable(value);
this.SerializableValidator.EnsureSerializable(value);
var memoryStream = new MemoryStream();
this.formatter.Serialize(memoryStream, value);
var bytes = memoryStream.ToArray();
var checksum = Checksum.CalculateChecksum(bytes);
if (this.cache.TryGet <T>(checksum, out var cacheValue))
{
return(cacheValue.GetPresistedValue());
}
var persistTasks = new List <Task>(this.storages.Length);
foreach (var store in this.storages)
{
persistTasks.Add(store.EnsurePresistAsync(checksum, bytes));
}
StoreResult <T> persistedValue = new Persisted <T>(value, this, checksum);
foreach (var task in persistTasks)
{
await task.ConfigureAwait(false);
}
var cachedValue = this.cache.AddOrGet(persistedValue);
return(cachedValue.GetPresistedValue());
}