Ecs: Add (optional) change tracking #1

+194 -170

Cargo.lock

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+5

src/change_tracking_disable.sql

··· 0 0 0 0 0

··· 1 + drop trigger if exists components_changes_attach_trigger; 2 + 3 + drop trigger if exists components_changes_update_trigger; 4 + 5 + drop trigger if exists components_changes_detach_trigger;

+40

src/change_tracking_enable.sql

··· 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

··· 1 + -- Runs when a component is attached 2 + create trigger if not exists components_changes_attach_trigger 3 + after insert 4 + on components for each row 5 + begin 6 + insert into changes (entity, component, change) 7 + select new.entity, new.component, 'create' 8 + where not exists ( 9 + select true from components 10 + where entity = new.entity 11 + and component != new.component 12 + ); 13 + 14 + insert into changes (entity, component, change) 15 + select new.entity, new.component, 'attach'; 16 + end; 17 + 18 + -- Runs when a component is changed 19 + create trigger if not exists components_changes_update_trigger 20 + after update 21 + on components for each row 22 + begin 23 + insert into changes (entity, component, change) 24 + values (new.entity, new.component, 'attach'); 25 + end; 26 + 27 + -- Runs when a component is detached 28 + create trigger if not exists components_changes_detach_trigger 29 + after delete 30 + on components for each row 31 + begin 32 + insert into changes (entity, component, change) 33 + values (old.entity, old.component, 'detach'); 34 + 35 + insert into changes (entity, component, change) 36 + select old.entity, old.component, 'destroy' 37 + where not exists ( 38 + select true from components where entity = old.entity 39 + ); 40 + end;

+1 -1

src/entity.rs

··· 1 use std::iter; 2 3 use rusqlite::params; 4 - use tracing::{debug, trace}; 5 6 use crate::{ 7 component::Bundle,

··· 1 use std::iter; 2 3 use rusqlite::params; 4 + use tracing::debug; 5 6 use crate::{ 7 component::Bundle,

+138 -2

src/lib.rs

··· 1 pub mod component; 2 - 3 pub use component::{Component, ComponentRead, ComponentWrite}; 4 5 pub mod entity; ··· 76 } 77 } 78 0 0 0 0 0 0 0 0 0 0 0 0 0 0 79 impl Ecs { 80 pub fn new_entity<'a>(&'a self) -> NewEntity<'a> { 81 Entity::without_id(self) ··· 181 } 182 } 183 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 184 pub mod rusqlite { 185 pub use rusqlite::*; 186 } ··· 216 #[cfg(test)] 217 mod tests { 218 // #[derive(Component)] derives `impl ecsdb::Component for ...` 219 - use crate::{self as ecsdb, Ecs}; 220 use crate::{BelongsTo, Component}; 221 222 use anyhow::anyhow; ··· 572 573 Ok(()) 574 } 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 575 }

··· 1 pub mod component; 0 2 pub use component::{Component, ComponentRead, ComponentWrite}; 3 4 pub mod entity; ··· 75 } 76 } 77 78 + impl Ecs { 79 + pub fn enable_change_tracking(&mut self) -> Result<(), Error> { 80 + self.conn 81 + .execute_batch(include_str!("change_tracking_enable.sql"))?; 82 + Ok(()) 83 + } 84 + 85 + pub fn disable_change_tracking(&mut self) -> Result<(), Error> { 86 + self.conn 87 + .execute_batch(include_str!("change_tracking_disable.sql"))?; 88 + Ok(()) 89 + } 90 + } 91 + 92 impl Ecs { 93 pub fn new_entity<'a>(&'a self) -> NewEntity<'a> { 94 Entity::without_id(self) ··· 194 } 195 } 196 197 + #[derive(Debug, PartialEq, Eq)] 198 + pub enum Change { 199 + Create { entity: EntityId }, 200 + Attach { entity: EntityId, component: String }, 201 + Detach { entity: EntityId, component: String }, 202 + Destroy { entity: EntityId }, 203 + } 204 + 205 + impl Ecs { 206 + pub fn changes(&self) -> Result<Vec<Change>, Error> { 207 + let mut stmt = self 208 + .conn 209 + .prepare_cached("select * from changes order by sequence asc")?; 210 + 211 + let changes = stmt 212 + .query_map(params![], |row| { 213 + let entity = row.get("entity")?; 214 + let change: String = row.get("change")?; 215 + 216 + match change.as_str() { 217 + "create" => Ok(Change::Create { entity }), 218 + "attach" => { 219 + let component = row.get("component")?; 220 + Ok(Change::Attach { entity, component }) 221 + } 222 + "detach" => { 223 + let component = row.get("component")?; 224 + Ok(Change::Detach { entity, component }) 225 + } 226 + "destroy" => Ok(Change::Destroy { entity }), 227 + other => { 228 + panic!("Invalid 'changes.change' {other:?}"); 229 + } 230 + } 231 + })? 232 + .collect::<Result<_, _>>()?; 233 + 234 + Ok(changes) 235 + } 236 + 237 + pub fn clear_changes(&self) -> Result<(), Error> { 238 + self.conn.execute("delete from changes", params![])?; 239 + Ok(()) 240 + } 241 + } 242 + 243 pub mod rusqlite { 244 pub use rusqlite::*; 245 } ··· 275 #[cfg(test)] 276 mod tests { 277 // #[derive(Component)] derives `impl ecsdb::Component for ...` 278 + use crate::{self as ecsdb, Change, Ecs}; 279 use crate::{BelongsTo, Component}; 280 281 use anyhow::anyhow; ··· 631 632 Ok(()) 633 } 634 + 635 + #[test] 636 + fn change_tracking_enable_disable() -> Result<(), anyhow::Error> { 637 + let mut ecs = super::Ecs::open_in_memory()?; 638 + ecs.enable_change_tracking()?; 639 + 640 + assert_eq!(ecs.changes()?, vec![]); 641 + 642 + ecs.new_entity().attach(A); 643 + assert_eq!(ecs.changes()?.len(), 2); 644 + 645 + ecs.disable_change_tracking()?; 646 + ecs.clear_changes()?; 647 + 648 + ecs.new_entity().attach(A); 649 + assert!(ecs.changes()?.is_empty()); 650 + 651 + Ok(()) 652 + } 653 + 654 + #[test] 655 + fn change_tracking() -> Result<(), anyhow::Error> { 656 + let mut ecs = super::Ecs::open_in_memory()?; 657 + ecs.enable_change_tracking()?; 658 + 659 + let mut changes = vec![]; 660 + 661 + assert_eq!(ecs.changes()?, vec![]); 662 + 663 + let entity = ecs.new_entity().attach(A); 664 + 665 + changes.extend([ 666 + Change::Create { 667 + entity: entity.id(), 668 + }, 669 + Change::Attach { 670 + entity: entity.id(), 671 + component: <A as Component>::component_name().to_owned(), 672 + }, 673 + ]); 674 + 675 + assert_eq!(ecs.changes()?, changes); 676 + 677 + entity.attach(B); 678 + changes.push(Change::Attach { 679 + entity: entity.id(), 680 + component: <B as Component>::component_name().to_owned(), 681 + }); 682 + 683 + assert_eq!(ecs.changes()?, changes); 684 + 685 + entity.detach::<B>(); 686 + changes.push(Change::Detach { 687 + entity: entity.id(), 688 + component: <B as Component>::component_name().to_owned(), 689 + }); 690 + 691 + assert_eq!(ecs.changes()?, changes); 692 + 693 + entity.detach::<A>(); 694 + changes.extend([ 695 + Change::Detach { 696 + entity: entity.id(), 697 + component: <A as Component>::component_name().to_owned(), 698 + }, 699 + Change::Destroy { 700 + entity: entity.id(), 701 + }, 702 + ]); 703 + 704 + assert_eq!(ecs.changes()?, changes); 705 + 706 + ecs.clear_changes()?; 707 + assert!(ecs.changes()?.is_empty()); 708 + 709 + Ok(()) 710 + } 711 }

+7

src/schema.sql

··· 20 21 end; 22 0 0 0 0 0 0 0 23 create table if not exists resources ( 24 name text not null unique, 25 data blob,

··· 20 21 end; 22 23 + create table if not exists changes ( 24 + sequence integer primary key autoincrement, 25 + entity integer not null, 26 + component text, 27 + change text not null 28 + ); 29 + 30 create table if not exists resources ( 31 name text not null unique, 32 data blob,

+1 -1

src/system.rs

··· 1 use serde::{Deserialize, Serialize}; 2 use tracing::{debug, error}; 3 4 - use crate::{self as ecsdb, query, Component, Ecs, Entity, EntityId}; 5 6 use core::marker::PhantomData; 7 use std::borrow::Cow;

··· 1 use serde::{Deserialize, Serialize}; 2 use tracing::{debug, error}; 3 4 + use crate::{self as ecsdb, query, Component, Ecs, Entity}; 5 6 use core::marker::PhantomData; 7 use std::borrow::Cow;