138 lines
4.2 KiB
Rust
138 lines
4.2 KiB
Rust
//! Implements a [*dataspace*][crate::dataspace#GarnockJones2017]
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//! entity.
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//!
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//! **References.**
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//!
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//! - Garnock-Jones, Tony. <a name="GarnockJones2017">“Conversational
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//! Concurrency.”</a> PhD, Northeastern University, 2017. [Available
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//! on the web](https://syndicate-lang.org/tonyg-dissertation/).
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//! [PDF](https://syndicate-lang.org/papers/conversational-concurrency-201712310922.pdf).
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use super::skeleton;
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use super::actor::*;
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use super::schemas::dataspace::*;
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use super::schemas::dataspace::_Any;
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use preserves::value::Map;
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use std::convert::TryFrom;
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// #[derive(Debug)]
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// pub struct Churn {
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// pub assertions_added: usize,
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// pub assertions_removed: usize,
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// pub endpoints_added: usize,
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// pub endpoints_removed: usize,
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// pub observers_added: usize,
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// pub observers_removed: usize,
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// pub messages_injected: usize,
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// pub messages_delivered: usize,
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// }
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// impl Churn {
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// pub fn new() -> Self {
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// Self {
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// assertions_added: 0,
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// assertions_removed: 0,
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// endpoints_added: 0,
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// endpoints_removed: 0,
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// observers_added: 0,
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// observers_removed: 0,
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// messages_injected: 0,
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// messages_delivered: 0,
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// }
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// }
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//
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// pub fn reset(&mut self) {
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// *self = Churn::new()
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// }
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// }
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/// A Dataspace object (entity).
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#[derive(Debug)]
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pub struct Dataspace {
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/// Index over assertions placed in the dataspace; used to
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/// efficiently route assertion changes and messages to observers.
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pub index: skeleton::Index,
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/// Local memory of assertions indexed by `Handle`, used to remove
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/// assertions from the `index` when they are retracted.
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pub handle_map: Map<Handle, (_Any, Option<Observe>)>,
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// pub churn: Churn,
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}
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impl Dataspace {
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/// Construct a new, empty dataspace.
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pub fn new() -> Self {
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Self {
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index: skeleton::Index::new(),
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handle_map: Map::new(),
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// churn: Churn::new(),
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}
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}
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/// Retrieve the current count of *distinct* assertions placed in
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/// the dataspace.
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pub fn assertion_count(&self) -> usize {
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self.index.assertion_count()
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}
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/// Retrieve the current count of assertions, including
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/// duplicates, placed in the dataspace.
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pub fn endpoint_count(&self) -> isize {
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self.index.endpoint_count()
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}
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/// Retrieve the current count of
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/// [`Observe`][crate::schemas::dataspace::Observe] assertions in
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/// the dataspace.
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pub fn observer_count(&self) -> usize {
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self.index.observer_count()
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}
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}
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impl Entity<_Any> for Dataspace {
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fn assert(&mut self, t: &mut Activation, a: _Any, h: Handle) -> ActorResult {
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tracing::trace!(assertion = ?a, handle = ?h, "assert");
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// let old_assertions = self.index.assertion_count();
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self.index.insert(t, &a);
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// self.churn.assertions_added += self.index.assertion_count() - old_assertions;
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// self.churn.endpoints_added += 1;
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if let Ok(o) = Observe::try_from(&a) {
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self.index.add_observer(t, &o.pattern, &o.observer);
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// self.churn.observers_added += 1;
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self.handle_map.insert(h, (a, Some(o)));
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} else {
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self.handle_map.insert(h, (a, None));
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}
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Ok(())
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}
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fn retract(&mut self, t: &mut Activation, h: Handle) -> ActorResult {
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tracing::trace!(handle = ?h, "retract");
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if let Some((a, maybe_o)) = self.handle_map.remove(&h) {
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if let Some(o) = maybe_o {
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self.index.remove_observer(t, o.pattern, &o.observer);
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// self.churn.observers_removed += 1;
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}
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// let old_assertions = self.index.assertion_count();
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self.index.remove(t, &a);
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// self.churn.assertions_removed += old_assertions - self.index.assertion_count();
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// self.churn.endpoints_removed += 1;
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}
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Ok(())
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}
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fn message(&mut self, t: &mut Activation, m: _Any) -> ActorResult {
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tracing::trace!(body = ?m, "message");
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// self.index.send(t, &m, &mut self.churn.messages_delivered);
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self.index.send(t, &m);
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// self.churn.messages_injected += 1;
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Ok(())
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}
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}
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