1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91

#[macro_use]
extern crate log;

use riker::actors::ChannelRef;
use std::fmt;
use uuid::Uuid;

pub use entity::{Entity, EntityName, Model, Query, Result, CQRS, ES};
pub use entity_manager::Manager;
pub use riker_es_macros as macros;
pub use store::*;

pub type EventBus<T> = ChannelRef<Event<T>>;

mod entity;
mod entity_manager;
mod store;

/// Events are changes to the system generated by entities after processing
/// other events or external commands
#[derive(Clone, Debug)]
pub enum Event<T: Model> {
    Create(T),
    Change(EntityId, T::Change),
}
impl<T: Model> Event<T> {
    pub fn entity_id(&self) -> EntityId {
        match self {
            Event::Create(e) => e.id(),
            Event::Change(id, _) => *id,
        }
    }

    pub fn entity(&self) -> Option<T> {
        match self {
            Event::Create(e) => Some(e.clone()),
            Event::Change(_, _) => None,
        }
    }

    pub fn change(&self) -> Option<T::Change> {
        match self {
            Event::Create(_) => None,
            Event::Change(_, c) => Some(c.clone()),
        }
    }
}
impl<T: Model> From<(EntityId, T::Change)> for Event<T> {
    fn from((id, data): (EntityId, T::Change)) -> Self {
        Event::Change(id, data)
    }
}
impl<T: Model> From<T> for Event<T> {
    fn from(data: T) -> Self {
        Event::Create(data)
    }
}

/// Uniquely idenfies an entity
#[derive(Clone, Debug, Copy, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct EntityId(Uuid);
impl EntityId {
    pub fn new() -> Self {
        Default::default()
    }
}
impl From<String> for EntityId {
    fn from(id: String) -> Self {
        id.as_str().into()
    }
}
impl From<&str> for EntityId {
    fn from(id: &str) -> Self {
        EntityId(Uuid::new_v5(&Uuid::NAMESPACE_URL, id.as_bytes()))
    }
}
impl From<Uuid> for EntityId {
    fn from(uuid: Uuid) -> Self {
        EntityId(uuid)
    }
}
impl fmt::Display for EntityId {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.0)
    }
}
impl Default for EntityId {
    fn default() -> Self {
        Uuid::new_v4().into()
    }
}