Enum Effect 

pub enum Effect {
    Read,
    ProcessState,
    RepositoryMutation,
}

What running a capability changes outside the caller.

Classified, never declared: it follows from the kind, which is the field a declaration already carries. A projection reads this to decide whether to ask before running something — the Cockpit’s confirmation is derived from it — instead of naming capabilities it must treat carefully, which is a list that goes stale the day after it is written.

Variants

Read

Nothing changes. Every query and every resource of this executable.

ProcessState

This process’s own memory changes, and nothing outside it.

RepositoryMutation

The repository changes.

For most of this executable’s life nothing classified to this, because no capability of any kind wrote to the repository. That day arrived with ADR 0040: development semantics are capabilities of this runtime, and the first of them — plan.transition — stamps a field into an issue’s own tracked record. The variant was put on the model in advance so that when one did, it would say so here, where a projection already reads it and a client already asks before running it, rather than in whichever page happens to render its button.

It is not classified from the kind, because the kind cannot know it: a command that announces a peer and a command that writes a tracked file are the same kind. A handler that writes the repository says so with ExecutionPolicy::writes_repository, the way one that stops says so with ExecutionPolicy::stoppable.

Trait Implementations

impl Clone for Effect

fn clone(&self) -> Effect

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Effect

impl Debug for Effect

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Effect

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Effect

impl JsonSchema for Effect

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl Ord for Effect

fn cmp(&self, other: &Effect) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Effect

fn eq(&self, other: &Effect) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Effect

fn partial_cmp(&self, other: &Effect) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Effect

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Effect