public static async Task <Post> FromCacheAsync(
IResourceCacheService resourceCacheService,
IInternalUserLoader internalUserLoader,
IAttachmentLoader attachmentLoader,
IPostLicenseLoader postLicenseLoader,
CachePost cachePost,
CancellationToken cancellationToken)
{
Ensure.Argument.IsNotNull(internalUserLoader, nameof(internalUserLoader));
Ensure.Argument.IsNotNull(attachmentLoader, nameof(attachmentLoader));
Ensure.Argument.IsNotNull(postLicenseLoader, nameof(postLicenseLoader));
Ensure.Argument.IsNotNull(cachePost, nameof(cachePost));
// Resolve dependencies.
var userTask = internalUserLoader.FetchAsync(cachePost.UserId, cancellationToken);
var permissionsTask = PostPermissions.FromCacheAsync(internalUserLoader, cachePost.Permissions, cancellationToken);
var linksTasks = cachePost.Links?.Select(r => PostReference.FromCacheAsync(internalUserLoader, r, cancellationToken)).ToList() ?? new List <Task <PostReference> >();
var attachmentsTasks = cachePost.Attachments?.Select(a => PostAttachment.FromCacheAsync(attachmentLoader, a, cancellationToken)).ToList() ?? new List <Task <PostAttachment> >();
var licensesTasks = cachePost.Licenses?.Select(l => postLicenseLoader.LoadAsync(l, cancellationToken)).ToList() ?? new List <Task <PostLicense> >();
await Task.WhenAll(
userTask,
permissionsTask,
Task.WhenAll(linksTasks),
Task.WhenAll(attachmentsTasks),
Task.WhenAll(licensesTasks)
);
// Make sure all of our required dependencies are here.
var user = userTask.Result;
Ensure.Dependency.IsNotNull(user, nameof(user));
var licenses = licensesTasks.Select(t => t.Result).ToList();
Ensure.Dependency.IsNotNull(licenses, nameof(licenses));
return(new Post(resourceCacheService)
{
Id = cachePost.Id,
VersionId = cachePost.VersionId,
CreatedAt = cachePost.CreatedAt,
DeletedAt = cachePost.DeletedAt,
OriginalCreatedAt = cachePost.OriginalCreatedAt,
// User.
User = user,
OriginalEntity = cachePost.OriginalEntity,
// Version.
Type = PostType.FromString(cachePost.Type),
Permissions = permissionsTask.Result,
Links = linksTasks.Select(t => t.Result).ToList(),
Attachments = attachmentsTasks.Select(t => t.Result).ToList(),
Licenses = licenses,
// Dates.
PublishedAt = cachePost.PublishedAt,
OriginalPublishedAt = cachePost.OriginalPublishedAt
});
}
