Use Case Position Service

Position Services

Position services are used in a number of scenarios from web-store inventory list to complex asset iformation for gobal banking:

Posstion list for asset asset trading
real-time market risk
stock lending and repo (especially during controls on short selling)
Stock ladders
trade matching
working capital/ cash-in-hand

Traditionally positions would have been calculated by aggregating positions over a number of trading books, but the high number of queries can presented an unacceptble load on the system-of-record, and potentially lock-serialisation. For complex businesses this need is often addressed by using a caching service that is updated with each trade.

Hiperspace Cube solution

Hiperspace Cube functionality enables read-time delta aggregation as the inventory of assets are bought and sold, with aggregates at every level of book and contry holding.

Type	│	When	│	Trigger	│	Notes
Full	│	Often Daily	│	Scheduled	│	reaggregates the base level of Cube fact
Delta	│	Continuous	│	Whenever a fact changes	│	aggregates the facts and summaries affected by the change to the fact, but no others
Dependency	│	Continuous	│	Whenever a `@DeltaIndex` element references by a fact changes	│	aggregates the facts and summaries affected by the change to a fact dependency, but no others
Related	│	Frequently	│	Whenever a `@DeltaIndex` element related is some way to fact changes	│	aggregates the facts and summaries affected by the change, but no others
Dimension	│	Frequently	│	Change to a dimension with a `@DeltaIndex` changes	│	Clears any summaries that might now be invalid due to restructure
	│	as needed	│	read	│	Any summaries that are not currently stored are recalculated from base facts

This HiLang schema maintains a cube for Instrument and quantity by country holding the asset:

@CubeDimension
entity Country (ISO : String) [Instruments : Instrument (Country = this)];

@CubeDimension, Versioned
entity Instrument 
(ISIN : String)
{Country : Country, Product : Product} 
[Price : Price, Market = Price.Market];

@CubeFact, DeltaIndex
entity Trade : Versioned
	(id : Int64) 
{
	@CubeMeasure(Aggregate.Sum) 
	Quantity : Decimal, 
	Instrument : Instrument, 
	Portfolio : Portfolio,
	Account : Account
}

The Hiperspace cubes hold the aggregate total with a time dimension

Hiperspace Cube aggregation obviates the need for seperate position servers and caches because hiperspace elements are stored using the fastest durable storage available with KV-SDD devices