JoinPoint

Provides contextual information about an intercepted function call.

A JoinPoint instance is constructed by the AspectK compiler plugin at each intercepted call site and passed to every matching advice function. It exposes the receiver object, static method-signature metadata, and the runtime arguments of the call.

The concrete implementation injected at runtime is io.github.molelabs.aspectk.runtime.internal.DefaultJoinPoint. Advice code should program to this interface rather than the concrete type.

Usage in advice

@Before(target = [Authenticated::class])
fun checkAuth(joinPoint: JoinPoint) {
    val receiver = joinPoint.target           // null for top-level functions
    val name     = joinPoint.signature.methodName
    val firstArg = joinPoint.args.firstOrNull()
    // Type-safe argument access:
    val userId = joinPoint.args[0] as? String
}

See also