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use std::{ fmt, panic::{RefUnwindSafe, UnwindSafe}, sync::{Arc, Mutex}, }; use crate::actor::Actor; /// Provides instances of `ActorProducer` for use when creating Actors (`actor_of_props`). /// /// Actors are not created directly. Instead you provide an `ActorProducer` /// that allows the `ActorSystem` to start an actor when `actor_of_props` is used, /// or when an actor fails and a supervisor requests an actor to be restarted. /// /// `ActorProducer` can hold values required by the actor's factory method /// parameters. pub struct Props; impl Props { /// Creates an `ActorProducer` with no factory method parameters. /// /// # Examples /// /// ``` /// # use riker::actors::*; /// /// struct User; /// /// impl User { /// fn actor() -> Self { /// User /// } /// } /// /// # impl Actor for User { /// # type Msg = String; /// # fn recv(&mut self, _ctx: &Context<String>, _msg: String, _sender: Sender) {} /// # } /// // main /// let sys = ActorSystem::new().unwrap(); /// /// let props = Props::new_from(User::actor); /// /// // start the actor and get an `ActorRef` /// let actor = sys.actor_of_props("user", props).unwrap(); /// ``` #[inline] pub fn new_from<A, F>(creator: F) -> Arc<Mutex<impl ActorProducer<Actor = A>>> where A: Actor + Send + 'static, F: Fn() -> A + Send + 'static, { Arc::new(Mutex::new(ActorProps::new(creator))) } /// Creates an `ActorProducer` with one or more factory method parameters. /// /// # Examples /// An actor requiring a single parameter. /// ``` /// # use riker::actors::*; /// /// struct User { /// name: String, /// } /// /// impl User { /// fn actor(name: String) -> Self { /// User { /// name /// } /// } /// } /// /// # impl Actor for User { /// # type Msg = String; /// # fn recv(&mut self, _ctx: &Context<String>, _msg: String, _sender: Sender) {} /// # } /// // main /// let sys = ActorSystem::new().unwrap(); /// /// let props = Props::new_from_args(User::actor, "Naomi Nagata".into()); /// /// let actor = sys.actor_of_props("user", props).unwrap(); /// ``` /// An actor requiring multiple parameters. /// ``` /// # use riker::actors::*; /// /// struct BankAccount { /// name: String, /// number: String, /// } /// /// impl BankAccount { /// fn actor((name, number): (String, String)) -> Self { /// BankAccount { /// name, /// number /// } /// } /// } /// /// # impl Actor for BankAccount { /// # type Msg = String; /// # fn recv(&mut self, _ctx: &Context<String>, _msg: String, _sender: Sender) {} /// # } /// // main /// let sys = ActorSystem::new().unwrap(); /// /// let props = Props::new_from_args(BankAccount::actor, /// ("James Holden".into(), "12345678".into())); /// /// // start the actor and get an `ActorRef` /// let actor = sys.actor_of_props("bank_account", props).unwrap(); /// ``` #[inline] pub fn new_from_args<A, Args, F>(creator: F, args: Args) -> Arc<Mutex<impl ActorProducer<Actor = A>>> where A: Actor + Send + 'static, Args: ActorArgs, F: Fn(Args) -> A + Send + 'static, { Arc::new(Mutex::new(ActorPropsWithArgs::new(creator, args))) } /// Creates an `ActorProducer` from default constructible type with no factory method parameters. /// /// # Examples /// /// ``` /// # use riker::actors::*; /// /// #[derive(Default)] /// struct User; /// /// # impl Actor for User { /// # type Msg = String; /// # fn recv(&mut self, _ctx: &Context<String>, _msg: String, _sender: Sender) {} /// # } /// // main /// let sys = ActorSystem::new().unwrap(); /// /// let props = Props::new::<User>(); /// /// // start the actor and get an `ActorRef` /// let actor = sys.actor_of_props("user", props).unwrap(); /// ``` /// Creates an `ActorProducer` from a type which implements ActorFactory with no factory method parameters. /// /// # Examples /// /// ``` /// # use riker::actors::*; /// /// struct User; /// /// impl ActorFactory for User { /// fn create() -> Self { /// User /// } /// } /// /// # impl Actor for User { /// # type Msg = String; /// # fn recv(&mut self, _ctx: &Context<String>, _msg: String, _sender: Sender) {} /// # } /// // main /// let sys = ActorSystem::new().unwrap(); /// /// let props = Props::new::<User>(); /// /// // start the actor and get an `ActorRef` /// let actor = sys.actor_of_props("user", props).unwrap(); /// ``` #[inline] pub fn new<A>() -> Arc<Mutex<impl ActorProducer<Actor = A>>> where A: ActorFactory, { Self::new_from(A::create) } /// Creates an `ActorProducer` from a type which implements ActorFactoryArgs with one or more factory method parameters. /// /// # Examples /// An actor requiring a single parameter. /// ``` /// # use riker::actors::*; /// /// struct User { /// name: String, /// } /// /// impl ActorFactoryArgs<String> for User { /// fn create_args(name: String) -> Self { /// User { /// name /// } /// } /// } /// /// # impl Actor for User { /// # type Msg = String; /// # fn recv(&mut self, _ctx: &Context<String>, _msg: String, _sender: Sender) {} /// # } /// // main /// let sys = ActorSystem::new().unwrap(); /// /// let props = Props::new_args::<User, _>("Naomi Nagata".into()); /// /// let actor = sys.actor_of_props("user", props).unwrap(); /// ``` /// An actor requiring multiple parameters. /// ``` /// # use riker::actors::*; /// /// struct BankAccount { /// name: String, /// number: String, /// } /// /// impl ActorFactoryArgs<(String, String)> for BankAccount { /// fn create_args((name, number): (String, String)) -> Self { /// BankAccount { /// name, /// number /// } /// } /// } /// /// # impl Actor for BankAccount { /// # type Msg = String; /// # fn recv(&mut self, _ctx: &Context<String>, _msg: String, _sender: Sender) {} /// # } /// // main /// let sys = ActorSystem::new().unwrap(); /// /// let props = Props::new_from_args(BankAccount::create_args, /// ("James Holden".into(), "12345678".into())); /// /// // start the actor and get an `ActorRef` /// let actor = sys.actor_of_props("bank_account", props).unwrap(); /// ``` #[inline] pub fn new_args<A, Args>(args: Args) -> Arc<Mutex<impl ActorProducer<Actor = A>>> where A: ActorFactoryArgs<Args>, Args: ActorArgs, { Self::new_from_args(A::create_args, args) } } /// A `Clone`, `Send` and `Sync` `ActorProducer` // pub type BoxActorProd<Msg> = Arc<Mutex<ActorProducer<Actor=BoxActor<Msg>>>>; pub type BoxActorProd<A> = Arc<Mutex<dyn ActorProducer<Actor = A>>>; pub trait ActorFactory: Actor { fn create() -> Self; } pub trait ActorFactoryArgs<Args: ActorArgs>: Actor { fn create_args(args: Args) -> Self; } impl<A: Default + Actor> ActorFactory for A { #[inline] fn create() -> Self { A::default() } } /// Represents the underlying Actor factory function for creating instances of `Actor`. /// /// Actors are not created directly. Instead you provide an `ActorProducer` /// that allows the `ActorSystem` to start an actor when `actor_of_props` is used, /// or when an actor fails and a supervisor requests an actor to be restarted. /// /// `ActorProducer` can hold values required by the actor's factory method /// parameters. pub trait ActorProducer: fmt::Debug + Send + UnwindSafe + RefUnwindSafe { type Actor: Actor; /// Produces an instance of an `Actor`. /// /// The underlying factory method provided /// in the original `Props::new(f: Fn() -> A + Send`) or /// `Props::new(f: Fn(Args) -> A + Send>, args: Args)` is called. /// /// Any parameters `Args` will be cloned and passed to the function. /// /// # Panics /// If the provided factory method panics the panic will be caught /// by the system, resulting in an error result returning to `actor_of_props`. fn produce(&self) -> Self::Actor; } impl<A> ActorProducer for Arc<Mutex<Box<dyn ActorProducer<Actor = A>>>> where A: Actor + Send + 'static, { type Actor = A; fn produce(&self) -> A { self.lock().unwrap().produce() } } impl<A> ActorProducer for Arc<Mutex<dyn ActorProducer<Actor = A>>> where A: Actor + Send + 'static, { type Actor = A; fn produce(&self) -> A { self.lock().unwrap().produce() } } impl<A> ActorProducer for Box<dyn ActorProducer<Actor = A>> where A: Actor + Send + 'static, { type Actor = A; fn produce(&self) -> A { (**self).produce() } } pub struct ActorProps<A: Actor> { creator: Box<dyn Fn() -> A + Send>, } impl<A: Actor> UnwindSafe for ActorProps<A> {} impl<A: Actor> RefUnwindSafe for ActorProps<A> {} impl<A> ActorProps<A> where A: Actor + Send + 'static, { pub fn new<F>(creator: F) -> impl ActorProducer<Actor = A> where F: Fn() -> A + Send + 'static, { ActorProps { creator: Box::new(creator), } } } impl<A> ActorProducer for ActorProps<A> where A: Actor + Send + 'static, { type Actor = A; fn produce(&self) -> A { let f = &self.creator; f() } } impl<A: Actor> fmt::Display for ActorProps<A> { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "Props") } } impl<A: Actor> fmt::Debug for ActorProps<A> { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "Props") } } pub struct ActorPropsWithArgs<A: Actor, Args: ActorArgs> { creator: Box<dyn Fn(Args) -> A + Send>, args: Args, } impl<A: Actor, Args: ActorArgs> UnwindSafe for ActorPropsWithArgs<A, Args> {} impl<A: Actor, Args: ActorArgs> RefUnwindSafe for ActorPropsWithArgs<A, Args> {} impl<A, Args> ActorPropsWithArgs<A, Args> where A: Actor + Send + 'static, Args: ActorArgs, { pub fn new<F>(creator: F, args: Args) -> impl ActorProducer<Actor = A> where F: Fn(Args) -> A + Send + 'static, { ActorPropsWithArgs { creator: Box::new(creator), args, } } } impl<A, Args> ActorProducer for ActorPropsWithArgs<A, Args> where A: Actor + Send + 'static, Args: ActorArgs, { type Actor = A; fn produce(&self) -> A { let f = &self.creator; let args = self.args.clone(); f(args) } } impl<A: Actor, Args: ActorArgs> fmt::Display for ActorPropsWithArgs<A, Args> { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "Props") } } impl<A: Actor, Args: ActorArgs> fmt::Debug for ActorPropsWithArgs<A, Args> { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "Props") } } pub trait ActorArgs: Clone + Send + Sync + 'static {} impl<T: Clone + Send + Sync + 'static> ActorArgs for T {}