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//! The traits which make main loop construction nicer use rotor::{Machine, Scope, EarlyScope, Loop, LoopInstance, SpawnError}; use rotor::{Response, Void}; /// Convenience enhancements to the main loop creator pub trait LoopExt<M> { /// This method is useful for things that have a state machine and an /// accessor to it. /// /// Function looks a little bit complicated with generic params. But it /// solves very useful pattern in easier way. /// /// Examples: /// /// * `rotor_dns::create_resolve()` /// * `rotor_carbon::connect_ip()` /// /// Usage is simple (carbon example): /// /// ```ignore /// let sink = loop_inst.add_and_fetch(Fsm::Carbon, |scope| { /// connect_ip(addr, scope) /// }); /// ``` /// /// Compare it to *traditional* way: /// /// ```ignore /// let mut sink_opt = None; /// loop_creator.add_machine_with(|scope| { /// let (fsm, sink) = connect_ip(addr, scope).unwrap(); /// sink_opt = Some(sink); /// Ok(Fsm::Carbon(fsm)) /// }).unwrap(); /// let sink = sink_opt.unwrap(); /// ``` /// fn add_and_fetch<F, W, T, N>(&mut self, fsm_wrapper: W, fun: F) -> Result<T, SpawnError<()>> where W: FnOnce(N) -> M, F: FnOnce(&mut EarlyScope) -> Response<(N, T), Void>; } /// Convenience enhancements to the main loop creator instance pub trait LoopInstanceExt<M: Machine> { /// This method is useful for things that have a state machine and an /// accessor to it. /// /// Function looks a little bit complicated with generic params. But it /// solves very useful pattern in easier way. /// /// Examples: /// /// * `rotor_dns::create_resolve()` /// * `rotor_carbon::connect_ip()` /// /// Usage is simple (carbon example): /// /// ```ignore /// let sink = loop_inst.add_and_fetch(Fsm::Carbon, |scope| { /// connect_ip(addr, scope) /// }); /// ``` /// /// Compare it to *traditional* way: /// /// ```ignore /// let mut sink_opt = None; /// loop_creator.add_machine_with(|scope| { /// let (fsm, sink) = connect_ip(addr, scope).unwrap(); /// sink_opt = Some(sink); /// Ok(Fsm::Carbon(fsm)) /// }).unwrap(); /// let sink = sink_opt.unwrap(); /// ``` /// fn add_and_fetch<F, W, T, N>(&mut self, fsm_wrapper: W, fun: F) -> Result<T, SpawnError<()>> where W: FnOnce(N) -> M, F: FnOnce(&mut Scope<M::Context>) -> Response<(N, T), Void>; } impl<M: Machine> LoopExt<M> for Loop<M> { fn add_and_fetch<F, W, T, N>(&mut self, fsm_wrapper: W, fun: F) -> Result<T, SpawnError<()>> where W: FnOnce(N) -> M, F: FnOnce(&mut EarlyScope) -> Response<(N, T), Void> { let mut result_opt = None; try!(self.add_machine_with(|scope| { fun(scope).wrap(|(fsm, value)| { result_opt = Some(value); fsm_wrapper(fsm) }) })); Ok(result_opt.unwrap()) } } impl<M: Machine> LoopInstanceExt<M> for LoopInstance<M> { fn add_and_fetch<F, W, T, N>(&mut self, fsm_wrapper: W, fun: F) -> Result<T, SpawnError<()>> where W: FnOnce(N) -> M, F: FnOnce(&mut Scope<M::Context>) -> Response<(N, T), Void> { let mut result_opt = None; try!(self.add_machine_with(|scope| { fun(scope).wrap(|(fsm, value)| { result_opt = Some(value); fsm_wrapper(fsm) }) })); Ok(result_opt.unwrap()) } }