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[uss_qualifier/resources] Update naming and documentation for ResourceModifyingResource #1474

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afc93ca
Update naming and documentation for ResourceModifyingResource
BenjaminPelletier May 20, 2026
8ad1a4d
Fix unit test error and warnings
BenjaminPelletier May 20, 2026
cb3c10b
Add ResourceProvidingResource base class per comment thread
BenjaminPelletier May 21, 2026
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10 changes: 5 additions & 5 deletions monitoring/uss_qualifier/resources/README.md
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Expand Up @@ -33,13 +33,13 @@ Resources for a given test configuration are all declared in a single global res
3. Every type of test resource must define how to create an instance of the test resource from an instance of the resource specification.


## Resource modifiers
## Resource-modifying resources

A `ResourceModifier` is a resource that wraps another resource and produces variants of it based on an integer index. This is useful when a test scenario needs multiple unique-but-related instances of a resource (e.g., distinct flights derived from a single base flight).
A `ResourceModifyingResource` is a resource capable of spawning other resources by modifying a template/base resource according to a desired key, such as an index. This is useful when a test scenario needs multiple unique-but-related instances of a resource (e.g., distinct flights derived from a single base flight).

To use a `ResourceModifier`:
To use a `ResourceModifyingResource`:

1. Declare it like any other resource, with its `base_resource` dependency pointing to the resource to be modified.
2. When need, call `adjust(index)` to obtain a modified copy of the base resource. Different `index` values produce different (unique) variants; the same `index` produces equivalent results.
2. When a variant of the base/template resource is needed, call `modify(key)` to obtain a modified copy of the base resource. Different `key` values generally produce different variants; the same `key` should produce equivalent results.
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@the-glu the-glu May 20, 2026 •
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Shouldn't it be the opposite ? A different key must produce different variants; the same may produce equivalents result?

I would assume that the spirit is to ensure different resources when needed because that more important that having the same values no?

(We can however have a 'must' for the same key -> same result)

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@BenjaminPelletier BenjaminPelletier May 20, 2026

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I'm not sure I understand the question; the change says "different key values -> different variants" + "same key -> equivalent results" -- the same thing as the original, just using "key" instead of "index".

One substantive difference is the removal of "(unique)" because that will probably often be the case, but there's no reason it necessarily needs to be in any case where we want a resource that spawns resources based on a template resource.

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That indeed about the "(unique)" removed and the addition of 'generally': since the final goal is to be able to have resources that can be used in parallel without conflicts, I would expect that those resources generator, by 'contract' return different variants in every case, not in most of the cases.

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The use case prompting the creation of this resource needs unique variants in all cases and should always produce equivalent results with equivalent keys. But the way this resource is defined allows it to be used in more general ways. Just because one use of a tool has certain requirements doesn't mean those requirements need to be imposed at the tool level rather than the tool-usage level. For instance, suppose we wanted to iterate over all ordered {uss1, uss2} pairs of participants, but a test needed a token that corresponded with the unordered pair of {uss1, uss2} (so {uss1, uss2} has a different token resource than {uss1, uss3}, but the same token resource as {uss2, uss1}). The suite may still be iterating over ordered pairs, but the resource producing modified versions of the underlying token resource may produce the same modified resource for multiple keys.

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Just because one use of a tool has certain requirements doesn't mean those requirements need to be imposed at the tool level rather than the tool-usage level.

Ok, but should we then define an sub-type of the base type than enforce this? I would expect instances used in 'parallel generator' to follow stricter rules (This probably answer the type question bellow as well)

but the resource producing modified versions of the underlying token resource may produce the same modified resource for multiple keys

(True, but in that case since it's unordered, it would be an equal key ({uss1,uss2}=={uss2,uss1}) even if it's has different values. But that don't mean other cases wouldn't exists.)

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Ok, but should we then define an sub-type of the base type than enforce this? I would expect instances used in 'parallel generator' to follow stricter rules (This probably answer the type question bellow as well)

I wouldn't expect we'd need to. A good test design will produce test scenarios that don't interfere with each other. Not interfering sometimes means "unique" modified resources (a necessary but not sufficient condition to deconflict geospatial resources), but not always (like in the case of iterating over ordered pairs but only needing unique unordered pairs for the token resource). But if we did need "unique" modified resources, I'd expect that to be introduced along with the thing that actually needs that constraint. The content in this PR (and #1465) doesn't need uniqueness -- the concept of stamping out modified copies of a template resource based on a key is a good standalone concept that doesn't need the additional constraint to work.

(True, but in that case since it's unordered, it would be an equal key ({uss1,uss2}=={uss2,uss1}) even if it's has different values. But that don't mean other cases wouldn't exists.)

No, the key would be ordered as the test scenarios (or whatever is being primarily iterated) are distinguishable based on order in the example, but the particular resource being generated by modifying a base resource doesn't depend on order. To elaborate on the example: suppose we have a test scenario that has two roles and uses a token resource that needs to be "unique" according to participants in the scenario, but not according to what roles they're playing. The action generator would iterate over every (role1, role2) assignment of the {uss1, uss2, uss3, ...} participants when instantiating test scenarios. And, each test scenario would need a token resource based on some template token resource. But, the token resource needed would only depend on the participants rather than role assignments, so the modified token resources spawned would not be unique. At the same time, geospatial deconfliction is needed, so every set of flight intents would need to be "unique".

Scenario Role 1 Role 2 Flight intents resource Token resource
1 uss1 uss1 A X
2 uss1 uss2 B Y
3 uss2 uss1 C Y
4 uss2 uss2 D Z

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A good test design will produce test scenarios that don't interfere with each other.

Ok - that move the "responsibility" up to test definitions to only combine things that works together without an explicit 'contract', but that valid.


The base resource itself remains available as `base_resource` on the modifier.
The base/template resource itself remains available as `base_resource` on the modifier.
6 changes: 4 additions & 2 deletions monitoring/uss_qualifier/resources/dev/__init__.py
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@@ -1,4 +1,6 @@
from .noop import NoOpResource as NoOpResource
from .test_exclusions import TestExclusionsResource as TestExclusionsResource
from .test_modifier import TestModifierModifierResource as TestModifierModifierResource
from .test_modifier import TestModifierResource as TestModifierResource
from .test_modifier import (
NumberGeneratorModifierResource as NumberGeneratorModifierResource,
)
from .test_modifier import NumberGeneratorResource as NumberGeneratorResource
35 changes: 20 additions & 15 deletions monitoring/uss_qualifier/resources/dev/test_modifier.py
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@@ -1,20 +1,23 @@
from implicitdict import ImplicitDict

from monitoring.uss_qualifier.resources.resource import Resource, ResourceModifier
from monitoring.uss_qualifier.resources.resource import (
Resource,
ResourceModifyingResource,
)


class TestModifierSpecification(ImplicitDict):
class NumberGeneratorSpecification(ImplicitDict):
base_id: int


class TestModifierResource(Resource[TestModifierSpecification]):
"""TestModifierResource is a simple resource returing 10 number, starting from base_id. Used for unit tests."""
class NumberGeneratorResource(Resource[NumberGeneratorSpecification]):
"""A simple resource returing 10 numbers, starting from base_id. Used for unit tests."""

_spec: TestModifierSpecification
_spec: NumberGeneratorSpecification

def __init__(
self,
specification: TestModifierSpecification,
specification: NumberGeneratorSpecification,
resource_origin: str,
):
super().__init__(specification, resource_origin)
Expand All @@ -24,22 +27,24 @@ def build_ids(self) -> list[int]:
return list(range(self._spec.base_id, self._spec.base_id + 10))


class TestModifierModifierSpecification(ImplicitDict):
class NumberGeneratorModifierSpecification(ImplicitDict):
shift_interval: int


class TestModifierModifierResource(
ResourceModifier[TestModifierModifierSpecification, TestModifierResource]
class NumberGeneratorModifierResource(
ResourceModifyingResource[
NumberGeneratorModifierSpecification, int, NumberGeneratorResource
]
):
"""Modifier for a TestModifierResource. Used for unit tests."""
"""Modifier for a NumberGeneratorResource. Used for unit tests."""

def adjust(self, index: int) -> TestModifierResource:
def provide_resource_for(self, key: int) -> NumberGeneratorResource:

# 'Clone' the resource with new specs
return TestModifierResource(
TestModifierSpecification(
return NumberGeneratorResource(
NumberGeneratorSpecification(
base_id=self.base_resource._spec.base_id
+ self._spec.shift_interval * index,
+ self._spec.shift_interval * key,
),
resource_origin=self.base_resource.resource_origin,
resource_origin=self._modified_resource_origin(str(key)),
)
46 changes: 36 additions & 10 deletions monitoring/uss_qualifier/resources/resource.py
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Expand Up @@ -41,15 +41,36 @@ def is_type(self, resource_type: str) -> bool:


ResourceType = TypeVar("ResourceType", bound=Resource)
SpawnKeyType = TypeVar("SpawnKeyType")


class ResourceModifier[SpecificationType: ImplicitDict, ResourceType](
Resource[SpecificationType], ABC
):
"""A specifc type of resources that can return adjusted an resource that shall unique based on a specifc 'index'.
The underlying resource shall be a dependency named 'base_resource'.
class ResourceProvidingResource[
SpecificationType: ImplicitDict,
SpawnKeyType,
ResourceType: Resource,
](Resource[SpecificationType], ABC):
"""Resource capable of spawning ResourceType resources according to a desired key, such as an index."""

Concrete subclass must implement 'adjust' as needed.
@abstractmethod
def provide_resource_for(self, key: SpawnKeyType) -> ResourceType:
"""Provide a resource corresponding with the provided key."""
raise NotImplementedError()

def _provided_resource_origin(self, key_name: str) -> str:
"""Method that should generally be used to describe the origin of a resource provided by this resource."""
return f"Resource for {key_name} provided by {self.resource_origin}"


class ResourceModifyingResource[
SpecificationType: ImplicitDict,
SpawnKeyType,
ResourceType: Resource,
](ResourceProvidingResource[SpecificationType, SpawnKeyType, ResourceType], ABC):
"""Resource capable of providing ResourceType resources by modifying a template/base
ResourceType resource according to a desired key, such as an index.

Useful for deconflicting multiple copies of a resource so many different variants of the same
test can be performed without conflicting with each other.
"""

_spec: SpecificationType
Expand All @@ -65,12 +86,17 @@ def __init__(
self._spec = specification
self.base_resource = base_resource

def _modified_resource_origin(self, modification_name: str) -> str:
"""Method that should generally be used to describe the origin of a resource provided by this resource."""
return f"Modification {modification_name} of {self.base_resource.resource_origin} by {self.resource_origin}"

@abstractmethod
def adjust(self, index: int) -> ResourceType:
"""
Return a new instance of the base resource, modified to be unique based on 'index' value.
def provide_resource_for(self, key: SpawnKeyType) -> ResourceType:
"""Provide a resource formed by modifying the template/base resource according to the provided key.

Different `key` values generally produce different variants; the same `key` should produce equivalent results.
"""
pass
raise NotImplementedError()


class MissingResourceError(ValueError):
Expand Down
70 changes: 36 additions & 34 deletions monitoring/uss_qualifier/resources/resources_test.py
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Expand Up @@ -5,72 +5,74 @@
ResourceID,
)
from monitoring.uss_qualifier.resources.dev.test_modifier import (
TestModifierModifierSpecification,
TestModifierSpecification,
NumberGeneratorModifierSpecification,
NumberGeneratorSpecification,
)
from monitoring.uss_qualifier.resources.resource import create_resources


class TestResourceModifier(unittest.TestCase):
def _build_test_modifier_declaration(
class TestModifierResource(unittest.TestCase):
def _build_number_generator_declaration(
self, base_id
) -> dict[ResourceID, ResourceDeclaration]:
return {
"test": ResourceDeclaration(
resource_type="resources.dev.TestModifierResource",
specification=TestModifierSpecification(base_id=base_id),
"number_generator": ResourceDeclaration(
resource_type="resources.dev.NumberGeneratorResource",
specification=NumberGeneratorSpecification(base_id=base_id),
)
}

def _build_test_modifier_modifier_declaration(
def _build_modifier_declaration(
self, base_id, shift_interval
) -> dict[ResourceID, ResourceDeclaration]:
return {
"test": self._build_test_modifier_declaration(base_id)["test"],
"test_modifier": ResourceDeclaration(
resource_type="resources.dev.TestModifierModifierResource",
specification=TestModifierModifierSpecification(
"number_generator": self._build_number_generator_declaration(base_id)[
"number_generator"
],
"modifier": ResourceDeclaration(
resource_type="resources.dev.NumberGeneratorModifierResource",
specification=NumberGeneratorModifierSpecification(
shift_interval=shift_interval
),
dependencies={
"base_resource": "test",
"base_resource": "number_generator",
},
),
}

def test_base_resource(self):
"""Test basic usage of the resource"""
declaration = self._build_test_modifier_declaration(42)
declaration = self._build_number_generator_declaration(42)

resources = create_resources(declaration, "test", True)
assert "test" in resources
resources = create_resources(declaration, "unittest", True)
assert "number_generator" in resources

resource = resources["test"]
resource = resources["number_generator"]

assert resource.build_ids() == [42, 43, 44, 45, 46, 47, 48, 49, 50, 51]

def test_base_resource_base_id(self):
"""Test that base id works as expected"""

declaration = self._build_test_modifier_declaration(52)
declaration = self._build_number_generator_declaration(52)

resources = create_resources(declaration, "test", True)
assert "test" in resources
resources = create_resources(declaration, "unittest", True)
assert "number_generator" in resources

resource = resources["test"]
resource = resources["number_generator"]

assert resource.build_ids() == [52, 53, 54, 55, 56, 57, 58, 59, 60, 61]

def test_modifier_resource(self):
"""Test basic usage of the resource modifier"""
declaration = self._build_test_modifier_modifier_declaration(42, 10)
"""Test basic usage of the resource modifier resource"""
declaration = self._build_modifier_declaration(42, 10)

resources = create_resources(declaration, "test", True)
assert "test_modifier" in resources
resources = create_resources(declaration, "unittest", True)
assert "modifier" in resources

resource = resources["test_modifier"]
resource = resources["modifier"]

assert resource.adjust(0).build_ids() == [
assert resource.provide_resource_for(0).build_ids() == [
42,
43,
44,
Expand All @@ -82,7 +84,7 @@ def test_modifier_resource(self):
50,
51,
]
assert resource.adjust(1).build_ids() == [
assert resource.provide_resource_for(1).build_ids() == [
52,
53,
54,
Expand All @@ -97,14 +99,14 @@ def test_modifier_resource(self):

def test_modifier_resource_shift(self):
"""Test shift usage of the resource modifier"""
declaration = self._build_test_modifier_modifier_declaration(42, 20)
declaration = self._build_modifier_declaration(42, 20)

resources = create_resources(declaration, "test", True)
assert "test_modifier" in resources
resources = create_resources(declaration, "unittest", True)
assert "modifier" in resources

resource = resources["test_modifier"]
resource = resources["modifier"]

assert resource.adjust(0).build_ids() == [
assert resource.provide_resource_for(0).build_ids() == [
42,
43,
44,
Expand All @@ -116,7 +118,7 @@ def test_modifier_resource_shift(self):
50,
51,
]
assert resource.adjust(1).build_ids() == [
assert resource.provide_resource_for(1).build_ids() == [
62,
63,
64,
Expand Down
4 changes: 2 additions & 2 deletions ...er/TestModifierModifierSpecification.json → ...NumberGeneratorModifierSpecification.json
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@@ -1,7 +1,7 @@
{
"$id": "https://github.com/interuss/monitoring/blob/main/schemas/monitoring/uss_qualifier/resources/dev/test_modifier/TestModifierModifierSpecification.json",
"$id": "https://github.com/interuss/monitoring/blob/main/schemas/monitoring/uss_qualifier/resources/dev/test_modifier/NumberGeneratorModifierSpecification.json",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"description": "monitoring.uss_qualifier.resources.dev.test_modifier.TestModifierModifierSpecification, as defined in monitoring/uss_qualifier/resources/dev/test_modifier.py",
"description": "monitoring.uss_qualifier.resources.dev.test_modifier.NumberGeneratorModifierSpecification, as defined in monitoring/uss_qualifier/resources/dev/test_modifier.py",
"properties": {
"$ref": {
"description": "Path to content that replaces the $ref",
Expand Down
4 changes: 2 additions & 2 deletions ...t_modifier/TestModifierSpecification.json → ...odifier/NumberGeneratorSpecification.json
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@@ -1,7 +1,7 @@
{
"$id": "https://github.com/interuss/monitoring/blob/main/schemas/monitoring/uss_qualifier/resources/dev/test_modifier/TestModifierSpecification.json",
"$id": "https://github.com/interuss/monitoring/blob/main/schemas/monitoring/uss_qualifier/resources/dev/test_modifier/NumberGeneratorSpecification.json",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"description": "monitoring.uss_qualifier.resources.dev.test_modifier.TestModifierSpecification, as defined in monitoring/uss_qualifier/resources/dev/test_modifier.py",
"description": "monitoring.uss_qualifier.resources.dev.test_modifier.NumberGeneratorSpecification, as defined in monitoring/uss_qualifier/resources/dev/test_modifier.py",
"properties": {
"$ref": {
"description": "Path to content that replaces the $ref",
Expand Down
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