HiLang 2.5.26

• .NETStandard 2.0

  • FSharp.Core (>= 10.0.100)
  • FsLexYacc (>= 11.3.0)
  • FsLexYacc.Runtime (>= 11.3.0)
  • Microsoft.CodeAnalysis.CSharp (>= 5.0.0)

https://www.cepheis.com/hiperspace/20251221
# Overview
Change method signatures for Path functions to use Route instead of RouteMap for remote calls.

Add Session2 to Subspace to support time-travel sessions over a graph space to support partial refresh of GPU cache for GPU parallel search of Graph methods without the need for recursive cycle detection.


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## Sequence support
Sequence numbers are a relational database feature that has largely been replaced been replaced by [UUID](https://en.wikipedia.org/wiki/Universally_unique_identifier) (*especially v7*) since they do not require a sequence source and can be allocated within a client, but they still have a use as an alternate key especially with [GPGPU](https://en.wikipedia.org/wiki/General-purpose_computing_on_graphics_processing_units) that need primitive points, *but do not wish to use the expense of mapping UUID to int128 values that may not be supported by the device*

**Hiperspace** implements *sequences* as unsigned 64-bit integers (*1 to 18,446,744,073,709,551,616*), and can be stored for any *element* key value

### Hiperspace

Added `UseSequenceAsync()` for driver implementation, together with proxy methods in {`BrowserSpace, FailoverSpace, GenerationSpace, PartitionSpace, SessionSpace`}

### Hiperspace.Heap
Implemented  `UseSequenceAsync()` in `Hiperspace.Heap` and added additional driver `CacheHeapSpace` for use by caches that do not require history to be maintained for elements. **CacheHeapSpace** should *only* be used by *caches* since it lacks the ability to reconcile concurrent changes through version inspection.

`LatestSpace` is replaced by `CacheHeapSpace` and will be removed in a future release.

### Hiperspace.Rocks
Implemented UseSequenceAsync()` in `Hiperspace.Rocks` and added additional driver `CacheRockSpace` for use by caches that do not require history to be maintained for elements. **CacheRockSpace** should *only* be used by *caches* since it lacks the ability to reconcile concurrent changes through version inspection.

The underlying RocksDB driver has been updated.

### SubSpace
`SubSpace` forwards the `UseSequenceAsync()` function to the underlying driver

### SetSpace
Added two functions to get a sequence counter from the driver:
* `GetSequenceAsync<TEntity>(TEntity? element)` to get the current sequence number associated with the domain key
* `UseSequenceAsync<TEntity>(TEntity? element)` to get a new  sequence number for the with the domain key

**NB** While the main use of Sequence numbers is to provide an alternate (*GPGPU friendly*) sequence number for a `Node`, it can be applied to any key value.
```
// get an order number that is unique within all orders
var orderNo = await space.Orders.UseSequenceAsync (new Order { });

// get a line number within the owning Order {1,2,3..}
var lineNo = await space.Lines.UseSequenceAsync (new Line { Order = order });
```

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### HiLang

Added code generation for the SubSpace methods.

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## OnInitialized
Addition of `virtual void OnInitialized()` function to SubSpace to allow domian subspaces to perform additional initialization after the Domain Space has been created by a generic container (e.g. **Hiperspace.DB**)