Struct SubscriptionDescriptor 

pub struct SubscriptionDescriptor {
    pub feed: String,
    pub columns: Option<Vec<String>>,
    pub filter: FilterExpr,
    pub sampling: Option<Sampling>,
    pub transport_pref: TransportPreference,
    pub format_pref: Option<FormatPreference>,
}

Request to open one feed.

Every field except feed is optional and represents a preference. A 0.1.0 publisher honours columns and ignores filter and sampling unless Capabilities advertises support.

Fields

feed: String

Name of the feed, matching a FeedDescriptor::name.

columns: Option<Vec<String>>

Subset of columns to receive. None means “all columns”.

filter: FilterExpr

Row-level filter applied server-side. 0.1.0 servers refuse anything other than FilterExpr::Empty.

sampling: Option<Sampling>

Optional sampling policy, e.g. “every Nth batch”.

transport_pref: TransportPreference

Ordered transport preference. Empty means “any”.

format_pref: Option<FormatPreference>

Preferred batch format. None means “publisher’s default”.

Implementations

impl SubscriptionDescriptor

pub fn new(feed: impl Into<String>) -> Self

pub fn columns<I, S>(self, cols: I) -> Self

where I: IntoIterator<Item = S>, S: Into<String>,

pub fn transport_pref(self, pref: TransportPreference) -> Self

pub fn format(self, fmt: FormatPreference) -> Self

pub fn sampling(self, sampling: Sampling) -> Self

Trait Implementations

impl Clone for SubscriptionDescriptor

fn clone(&self) -> SubscriptionDescriptor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SubscriptionDescriptor

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SubscriptionDescriptor

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for SubscriptionDescriptor

fn eq(&self, other: &SubscriptionDescriptor) -> 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 Serialize for SubscriptionDescriptor

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 SubscriptionDescriptor