API reference

SystemDAG

class SystemDAG

Manages the dependency graph of systems in the Spatial SDK.

SystemDAG (Directed Acyclic Graph) is responsible for:

Tracking system dependencies and their relationships

Ensuring proper execution order based on dependencies

Detecting and preventing dependency cycles

Organizing systems into priority groups for execution

Systems can specify dependencies using mustRunBefore and mustRunAfter relationships, which this class resolves into a valid execution order.

Name	Summary
SystemDAG	constructor()

Name	Summary
addSystem	fun addSystem(system: SystemBase, priorityGroup: PriorityGroup = PriorityGroup.NORMAL) Adds a system to the dependency graph.
findSystem	fun <T : SystemBase> findSystem(clazz: KClass<T>): T Finds a system in the dependency graph. Throws an exception if the system is not found.
removeSystem	inline fun <T : SystemBase> removeSystem(): Boolean Removes a system from the dependency graph using reified type parameter. fun <T : SystemBase> removeSystem(clazz: KClass<T>): Boolean Removes a system from the dependency graph.
setEarlySystems	fun setEarlySystems(earlySystems: List<SystemBase>) Sets the list of early systems that run before all other systems.
setLateSystems	fun setLateSystems(lateSystems: List<SystemBase>) Sets the list of late systems that run after all other systems.
topologicalSortWithCycleDetection	fun topologicalSortWithCycleDetection(): MutableList<SystemBase> Performs a topological sort of the systems based on their dependencies.
tryFindSystem	fun <T : SystemBase> tryFindSystem(clazz: KClass<T>): T? Attempts to find a system in the dependency graph.