Enum ResourceValidationError 

#[non_exhaustive]
pub enum ResourceValidationError {
    MissingResource {
        node: NodeId,
        system_name: &'static str,
        resource_type: &'static str,
        type_id: TypeId,
        access_mode: AccessMode,
    },
    MissingOutput {
        node: NodeId,
        system_name: &'static str,
        output_type: &'static str,
        type_id: TypeId,
    },
    ScopeMissingFactory {
        scope: NodeId,
        scope_name: &'static str,
        resource: &'static str,
    },
    ScopeMissingResource {
        scope: NodeId,
        scope_name: &'static str,
        resource: &'static str,
        action: &'static str,
    },
}

Errors that can occur during resource validation.

These errors are detected before graph execution starts, allowing early detection of missing resources that would cause runtime failures.

Examples

use polaris_graph::ResourceValidationError;
use polaris_graph::NodeId;
use polaris_system::param::AccessMode;
use std::any::TypeId;

let err = ResourceValidationError::MissingResource {
    node: NodeId::from_string("node_1"),
    system_name: "my_system",
    resource_type: "MyConfig",
    type_id: TypeId::of::<String>(),
    access_mode: AccessMode::Read,
};

// Display provides a human-readable message
let msg = format!("{err}");
assert!(msg.contains("my_system"));
assert!(msg.contains("MyConfig"));

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

MissingResource

A required resource is missing from the context.

Fields

node: NodeId

The node ID of the system requiring the resource.

system_name: &'static str

The name of the system.

resource_type: &'static str

The type name of the missing resource.

type_id: TypeId

The type ID of the missing resource.

access_mode: AccessMode

The access mode (read or write).

MissingOutput

A required output from a previous system is missing.

Fields

node: NodeId

The node ID of the system requiring the output.

system_name: &'static str

The name of the system.

output_type: &'static str

The type name of the missing output.

type_id: TypeId

The type ID of the missing output.

ScopeMissingFactory

A scope’s ContextPolicy declared forward_fresh::<T>() for a resource that has no registered factory in the parent context or globals.

Detected during GraphExecutor::validate_resources by walking the parent chain via SystemContext::factory_fn_by_type_id.

Fields

scope: NodeId

The scope node ID.

scope_name: &'static str

The scope node’s name.

resource: &'static str

The resource type that was missing a factory.

ScopeMissingResource

A scope’s ContextPolicy declared a per-resource crossing (forward::<T>() or fork::<T>()) for a resource that is not reachable from the parent context at validation time.

Detected during GraphExecutor::validate_resources via SystemContext::contains_resource_by_type_id. Mirrors the runtime ExecutionError::ScopeMissingResource safety net for callers that skip validation.

Fields

scope: NodeId

The scope node ID.

scope_name: &'static str

The scope node’s name.

resource: &'static str

The resource type that was missing.

action: &'static str

Which verb declared the crossing — "forward" or "fork".

Trait Implementations

impl Clone for ResourceValidationError

fn clone(&self) -> ResourceValidationError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ResourceValidationError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ResourceValidationError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for ResourceValidationError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.