Struct ItemWrite 

pub struct ItemWrite<T> {
    pub target: Option<NativeId>,
    pub item: T,
    pub depends_on: Vec<DependencyEdge>,
}

One create-or-update of a work item at a destination.

The two cases are one type because a destination decides between them by exactly one question — is there an item here to update — and the engine has already answered it.

Fields

target: Option<NativeId>

The destination item to update, or None to create one.

A source handed a target it does not hold returns SourceError::Refused rather than creating: the engine established that id before asking, so an absent one is a race the destination must not paper over.

item: T

The item as the destination should hold it once the write lands.

Its id is the id the item was read under at the source. A destination updating an item addresses target and ignores it; a destination creating one may derive a name from it and is free not to. Its url, location, created_at and updated_at are the destination’s own and are never written — where the source holds an item says nothing about where the destination does.

depends_on: Vec<DependencyEdge>

The forward dependency edges the copy read, with their far ends already resolved.

Each edge’s from is the item being written as the source named it, so a destination reads the to and the kind of each and supplies its own near end. A to naming another source is qualified and stays that way; a to inside the copied set arrives as the destination’s own native id.

Trait Implementations

impl<T: Clone> Clone for ItemWrite<T>

fn clone(&self) -> ItemWrite<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for ItemWrite<T>

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

Formats the value using the given formatter.

impl<'de, T> Deserialize<'de> for ItemWrite<T>

where T: Deserialize<'de>,

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> JsonSchema for ItemWrite<T>

where T: JsonSchema,

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<T: PartialEq> PartialEq for ItemWrite<T>

fn eq(&self, other: &ItemWrite<T>) -> bool

Equality operator ==.

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

Inequality operator !=.

impl<T> Serialize for ItemWrite<T>

where T: Serialize,

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<T: PartialEq> StructuralPartialEq for ItemWrite<T>