Table of Contents

Class RunBeforeAttribute

Namespace
KeenEyes
Assembly
KeenEyes.Abstractions.dll

Specifies that this system must run before another system.

[AttributeUsage(AttributeTargets.Class, Inherited = false, AllowMultiple = true)]
[ExcludeFromCodeCoverage]
public sealed class RunBeforeAttribute : Attribute
Inheritance
RunBeforeAttribute
Inherited Members

Examples

[System(Phase = SystemPhase.Update)]
[RunBefore(typeof(RenderSystem))]
public partial class MovementSystem : SystemBase
{
    public override void Update(float deltaTime) { }
}

Remarks

This attribute creates an ordering constraint between systems within the same phase. The system with this attribute will be scheduled to execute before the specified target system.

Multiple RunBeforeAttribute can be applied to the same system to express multiple dependencies. All constraints are resolved using topological sorting.

If the constraints create a cycle (e.g., A runs before B, B runs before A), an InvalidOperationException is thrown during system sorting.

Constructors

RunBeforeAttribute(Type)

Specifies that this system must run before another system.

public RunBeforeAttribute(Type targetSystem)

Parameters

targetSystem Type

The type of system that this system must run before.

Examples

[System(Phase = SystemPhase.Update)]
[RunBefore(typeof(RenderSystem))]
public partial class MovementSystem : SystemBase
{
    public override void Update(float deltaTime) { }
}

Remarks

This attribute creates an ordering constraint between systems within the same phase. The system with this attribute will be scheduled to execute before the specified target system.

Multiple RunBeforeAttribute can be applied to the same system to express multiple dependencies. All constraints are resolved using topological sorting.

If the constraints create a cycle (e.g., A runs before B, B runs before A), an InvalidOperationException is thrown during system sorting.

Exceptions

ArgumentNullException

Thrown when targetSystem is null.

Properties

TargetSystem

Gets the type of the system that this system must run before.

public Type TargetSystem { get; }

Property Value

Type

Exceptions

ArgumentNullException

Thrown when targetSystem is null.

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