/// Encodes a stream of `(Option<Row>, Option<Row>)` updates using the specified encoder.
///
/// This operator will only encode `fuel` number of updates per invocation. If necessary, it will
/// stash updates and use an [`timely::scheduling::Activator`] to re-schedule future invocations.
///
/// Input [`Row`] updates must me compatible with the given implementor of [`Encode`].
///
/// Updates that are not beyond the given [`SinkAsOf`] and/or the `gate_ts` will be discarded
/// without encoding them.
///
/// Input updates do not have to be partitioned and/or sorted. This operator will not exchange
/// data. Updates with lower timestamps will be processed before updates with higher timestamps
/// if they arrive in order. However, this is not a guarantee, as this operator does not wait
/// for the frontier to signal completeness. It is an optimization for downstream operators
/// that behave suboptimal when receiving updates that are too far in the future with respect
/// to the current frontier. The order of updates that arrive at the same timestamp will not be
/// changed.
Encodes a stream of `(Option, Option)` updates using the specified encoder.
This operator will only encode `fuel` number of updates per invocation. If necessary, it will
stash updates and use an [`timely::scheduling::Activator`] to re-schedule future invocations.

Input [`Row`] updates must me compatible with the given implementor of [`Encode`].

Updates that are not beyond the given [`SinkAsOf`] and/or the `gate_ts` will be discarded
without encoding them.

Input updates do not have to be partitioned and/or sorted. This operator will not exchange
data. Updates with lower timestamps will be processed before updates with higher timestamps
if they arrive in order. However, this is not a guarantee, as this operator does not wait
for the frontier to signal completeness. It is an optimization for downstream operators
that behave suboptimal when receiving updates that are too far in the future with respect
to the current frontier. The order of updates that arrive at the same timestamp will not be
changed.
Encodes a stream of ` ( Option Option ) ` updates using the specified encoder . This operator will only encode ` fuel ` number of updates per invocation . If necessary it will stash updates and use an [ ` timely :: scheduling :: Activator ` ] to re - schedule future invocations . Input [ ` Row ` ] updates must me compatible with the given implementor of [ ` Encode ` ] . Updates that are not beyond the given [ ` SinkAsOf ` ] and / or the ` gate_ts ` will be discarded without encoding them . Input updates do not have to be partitioned and / or sorted . This operator will not exchange data . Updates with lower timestamps will be processed before updates with higher timestamps if they arrive in order . However this is not a guarantee as this operator does not wait for the frontier to signal completeness . It is an optimization for downstream operators that behave suboptimal when receiving updates that are too far in the future with respect to the current frontier . The order of updates that arrive at the same timestamp will not be changed .
fn encode_stream<G>(
    input_stream: &Stream<G, ((Option<Row>, Option<Row>), Timestamp, Diff)>,
    as_of: SinkAsOf,
    shared_gate_ts: Rc<Cell<Option<Timestamp>>>,
    encoder: impl Encode + 'static,
    fuel: usize,
    name_prefix: String,
) -> Stream<G, ((Option<Vec<u8>>, Option<Vec<u8>>), Timestamp, Diff)>
where
    G: Scope<Timestamp = Timestamp>,
{
    let name = format!("{}-{}_encode", name_prefix, encoder.get_format_name());
    let mut builder = OperatorBuilder::new(name, input_stream.scope());
    let mut input = builder.new_input(&input_stream, Pipeline);
    let (mut output, output_stream) = builder.new_output();
    builder.set_notify(false);
    let activator = input_stream
        .scope()
        .activator_for(&builder.operator_info().address[..]);
    let mut stash: HashMap<Capability<Timestamp>, Vec<_>> = HashMap::new();
    let mut vector = Vec::new();
    let mut encode_logic = move |input: &mut InputHandle<
        Timestamp,
        ((Option<Row>, Option<Row>), Timestamp, Diff),
        _,
    >,
                                 output: &mut OutputHandle<
        _,
        ((Option<Vec<u8>>, Option<Vec<u8>>), Timestamp, Diff),
        _,
    >| {
        let mut fuel_remaining = fuel;
        // stash away all the input we get, we want to be a nice citizen
        input.for_each(|cap, data| {
            data.swap(&mut vector);
            let stashed = stash.entry(cap.retain()).or_default();
            for update in vector.drain(..) {
                let time = update.1;
                let should_emit = if as_of.strict {
                    as_of.frontier.less_than(&time)
                } else {
                    as_of.frontier.less_equal(&time)
                };
                let ts_gated = Some(time) <= shared_gate_ts.get();
                if !should_emit || ts_gated {
                    // Skip stale data for already published timestamps
                    continue;
                }
                stashed.push(update);
            }
        });
        // work off some of our data and then yield, can't be hogging
        // the worker for minutes at a time
        while fuel_remaining > 0 && !stash.is_empty() {
            let lowest_ts = stash
                .keys()
                .min_by(|x, y| x.time().cmp(y.time()))
                .expect("known to exist")
                .clone();
            let records = stash.get_mut(&lowest_ts).expect("known to exist");
            let mut session = output.session(&lowest_ts);
            let num_records_to_drain = cmp::min(records.len(), fuel_remaining);
            records
                .drain(..num_records_to_drain)
                .for_each(|((key, value), time, diff)| {
                    let key = key.map(|key| encoder.encode_key_unchecked(key));
                    let value = value.map(|value| encoder.encode_value_unchecked(value));
                    session.give(((key, value), time, diff));
                });
            fuel_remaining -= num_records_to_drain;
            if records.is_empty() {
                // drop our capability for this time
                stash.remove(&lowest_ts);
            }
        }
        if !stash.is_empty() {
            activator.activate();
            return true;
        }
        // signal that we're complete now
        false
    };
    builder.build_reschedule(|_capabilities| {
        move |_frontiers| {
            let mut output_handle = output.activate();
            encode_logic(&mut input, &mut output_handle)
        }
    });
    output_stream
}
fn encode_stream < G > ( input_stream : & Stream < G , ( ( Option < Row > , Option < Row > ) , Timestamp , Diff ) > , as_of : SinkAsOf , shared_gate_ts : Rc < Cell < Option < Timestamp > > > , encoder : impl Encode + ' static , fuel : usize , name_prefix : String , ) -> Stream < G , ( ( Option < Vec < u8 > > , Option < Vec < u8 > > ) , Timestamp , Diff ) > where G : Scope < Timestamp = Timestamp > , { let name = format ! ( " " name_prefix encoder get_format_name ( ) ) ; let mut builder = OperatorBuilder :: new ( name , input_stream . scope ( ) ) ; let mut input = builder . new_input ( & input_stream , Pipeline ) ; let ( mut output , output_stream ) = builder . new_output ( ) ; builder . set_notify ( false ) ; let activator = input_stream . scope ( ) . activator_for ( & builder . operator_info ( ) . address [ .. ] ) ; let mut stash : HashMap < Capability < Timestamp > , Vec < _ > > = HashMap :: new ( ) ; let mut vector = Vec :: new ( ) ; let mut encode_logic = move | input : & mut InputHandle < Timestamp , ( ( Option < Row > , Option < Row > ) , Timestamp , Diff ) , _ , > , output : & mut OutputHandle < _ , ( ( Option < Vec < u8 > > , Option < Vec < u8 > > ) , Timestamp , Diff ) , _ , > | { let mut fuel_remaining = fuel ; // stash away all the input we get, we want to be a nice citizen input . for_each ( | cap , data | { data . swap ( & mut vector ) ; let stashed = stash . entry ( cap . retain ( ) ) . or_default ( ) ; for update in vector . drain ( .. ) { let time = update . 1 ; let should_emit = if as_of . strict { as_of . frontier . less_than ( & time ) } else { as_of . frontier . less_equal ( & time ) } ; let ts_gated = Some ( time ) <= shared_gate_ts . get ( ) ; if ! should_emit || ts_gated { // Skip stale data for already published timestamps continue ; } stashed . push ( update ) ; } } ) ; // work off some of our data and then yield, can't be hogging // the worker for minutes at a time while fuel_remaining > 0 && ! stash . is_empty ( ) { let lowest_ts = stash . keys ( ) . min_by ( | x , y | x . time ( ) . cmp ( y . time ( ) ) ) . expect ( " " ) . clone ( ) ; let records = stash . get_mut ( & lowest_ts ) . expect ( " " ) ; let mut session = output . session ( & lowest_ts ) ; let num_records_to_drain = cmp :: min ( records . len ( ) , fuel_remaining ) ; records . drain ( .. num_records_to_drain ) . for_each ( | ( ( key , value ) , time , diff ) | { let key = key . map ( | key | encoder . encode_key_unchecked ( key ) ) ; let value = value . map ( | value | encoder . encode_value_unchecked ( value ) ) ; session . give ( ( ( key , value ) , time , diff ) ) ; } ) ; fuel_remaining -= num_records_to_drain ; if records . is_empty ( ) { // drop our capability for this time stash . remove ( & lowest_ts ) ; } } if ! stash . is_empty ( ) { activator . activate ( ) ; return true ; } // signal that we're complete now false } ; builder . build_reschedule ( | _capabilities | { move | _frontiers | { let mut output_handle = output . activate ( ) ; encode_logic ( & mut input , & mut output_handle ) } } ) ; output_stream }
Encodes a stream of `(Option<Row>, Option<Row>)` updates using the specified encoder.
Encodes a stream of ` ( Option<Row > Option<Row > ) ` updates using the specified encoder .
input_stream
&Stream<G, ((Option<Row>, Option<Row>), Timestamp, Diff)>
as_of
SinkAsOf
shared_gate_ts
Rc<Cell<Option<Timestamp>>>
encoder
impl Encode + 'static
fuel
usize
name_prefix
String