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
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131

/// Recipients implement `Hash` for a boxed instance, but it's not useful in cases
/// if you want to keep it in a `HashSet` for example, because the contents of
/// hash sets can't be borrowed as mutable and that means you can't call `act`
/// method of it.
/// It's recommended to use `HashSet<Id, Box<dyn Recipient>>` instead.
use super::Address;
use crate::actor_runtime::Actor;
use crate::handlers::{Action, ActionHandler, Interact, Interaction, InteractionTask};
use crate::ids::Id;
use anyhow::Error;
use async_trait::async_trait;
use std::fmt::Debug;
use std::hash::{Hash, Hasher};

/// Abstract `Address` to the `Actor` that can handle a specific message type.
#[async_trait]
pub trait ActionRecipient<T: Action>: Debug + Send + 'static {
    /// Send an `Action` to an `Actor`.
    async fn act(&mut self, msg: T) -> Result<(), Error>;

    /// Returns a reference to `Id` of an `Address` inside.
    #[doc(hidden)]
    fn id_ref(&self) -> &Id;

    #[doc(hidden)]
    fn dyn_clone(&self) -> Box<dyn ActionRecipient<T>>;

    #[doc(hidden)]
    fn dyn_hash(&self, state: &mut dyn Hasher);
}

impl<T: Action> Clone for Box<dyn ActionRecipient<T>> {
    fn clone(&self) -> Self {
        self.dyn_clone()
    }
}

impl<T: Action> PartialEq for Box<dyn ActionRecipient<T>> {
    fn eq(&self, other: &Self) -> bool {
        PartialEq::eq(self.id_ref(), other.id_ref())
    }
}

impl<T: Action> Eq for Box<dyn ActionRecipient<T>> {}

impl<T: Action> Hash for Box<dyn ActionRecipient<T>> {
    fn hash<H: Hasher>(&self, state: &mut H) {
        self.dyn_hash(state);
    }
}

#[async_trait]
impl<T, A> ActionRecipient<T> for Address<A>
where
    T: Action,
    A: Actor + ActionHandler<T>,
{
    async fn act(&mut self, msg: T) -> Result<(), Error> {
        Address::act(self, msg).await
    }

    fn id_ref(&self) -> &Id {
        self.raw_id()
    }

    fn dyn_clone(&self) -> Box<dyn ActionRecipient<T>> {
        Box::new(self.clone())
    }

    fn dyn_hash(&self, state: &mut dyn Hasher) {
        ActionRecipient::id_ref(self).hash(&mut Box::new(state));
    }
}

/// Abstract `Address` to the `Actor` that can handle an interaction.
pub trait InteractionRecipient<T: Interaction>: Debug + Send + 'static {
    /// Interact with an `Actor`.
    fn interact(&mut self, msg: T) -> InteractionTask<T>;

    /// Returns a reference to `Id` of an `Address` inside.
    #[doc(hidden)]
    fn id_ref(&self) -> &Id;

    #[doc(hidden)]
    fn dyn_clone(&self) -> Box<dyn InteractionRecipient<T>>;

    #[doc(hidden)]
    fn dyn_hash(&self, state: &mut dyn Hasher);
}

impl<T: Interaction> Clone for Box<dyn InteractionRecipient<T>> {
    fn clone(&self) -> Self {
        self.dyn_clone()
    }
}

impl<T: Interaction> PartialEq for Box<dyn InteractionRecipient<T>> {
    fn eq(&self, other: &Self) -> bool {
        PartialEq::eq(self.id_ref(), other.id_ref())
    }
}

impl<T: Interaction> Eq for Box<dyn InteractionRecipient<T>> {}

impl<T: Interaction> Hash for Box<dyn InteractionRecipient<T>> {
    fn hash<H: Hasher>(&self, state: &mut H) {
        self.dyn_hash(state);
    }
}

impl<T, A> InteractionRecipient<T> for Address<A>
where
    T: Interaction,
    A: Actor + ActionHandler<Interact<T>>,
{
    fn interact(&mut self, msg: T) -> InteractionTask<T> {
        Address::interact(self, msg)
    }

    fn id_ref(&self) -> &Id {
        self.raw_id()
    }

    fn dyn_clone(&self) -> Box<dyn InteractionRecipient<T>> {
        Box::new(self.clone())
    }

    fn dyn_hash(&self, state: &mut dyn Hasher) {
        InteractionRecipient::id_ref(self).hash(&mut Box::new(state));
    }
}