/// <summary>
/// Calls <see cref="ISnapshotStrategy{TAuthenticationToken}.IsSnapshotable"/> on <see cref="SnapshotStrategy"/>
/// If the <typeparamref name="TAggregateRoot"/> is snapshot-able <see cref="ISnapshotStore.Get{TAggregateRoot}"/> is called on <see cref="SnapshotStore"/>.
/// The Restore method is then called on
/// </summary>
/// <typeparam name="TAggregateRoot">The <see cref="Type"/> of the <see cref="IAggregateRoot{TAuthenticationToken}"/>.</typeparam>
/// <param name="id">The identifier of the <see cref="IAggregateRoot{TAuthenticationToken}"/> to restore, since the <paramref name="aggregate"/> may be completely uninitialised.</param>
/// <param name="aggregate">The <typeparamref name="TAggregateRoot"/></param>
/// <returns>-1 if no restoration was made, otherwise version number the <typeparamref name="TAggregateRoot"/> was rehydrated to.</returns>
/// <remarks>There may be more events after the snapshot that still need to rehydrated into the <typeparamref name="TAggregateRoot"/> after restoration.</remarks>
protected virtual int TryRestoreAggregateFromSnapshot <TAggregateRoot>(Guid id, TAggregateRoot aggregate)
{
int version = -1;
if (SnapshotStrategy.IsSnapshotable(aggregate.GetType()))
{
Snapshot snapshot = SnapshotStore.Get(aggregate.GetType(), id);
if (snapshot != null)
{
aggregate.AsDynamic().Restore(snapshot);
version = snapshot.Version;
}
}
return(version);
}
