Rename methods and loosen mutability for component link and agent

README.md

@@ -164,7 +164,7 @@ impl Agent for Worker {
         Worker { link }
     }
 
-    // Handle inner messages (of services of `send_back` callbacks)
+    // Handle inner messages (from callbacks)
     fn update(&mut self, msg: Self::Message) { /* ... */ }
 
     // Handle incoming messages from components of other agents.
@@ -195,7 +195,7 @@ impl Component for Model {
     type Properties = ();
 
     fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
-        let callback = link.send_back(|_| Msg::ContextMsg);
+        let callback = link.callback(|_| Msg::ContextMsg);
         // `Worker::bridge` spawns an instance if no one is available
         let context = context::Worker::bridge(callback); // Connected! :tada:
         Model { context }
@@ -362,7 +362,7 @@ impl Component for Model {
     fn update(&mut self, msg: Self::Message) -> ShouldRender {
         match msg {
             Msg::Fire => {
-                let send_msg = self.link.send_back(|_| Msg::Timeout);
+                let send_msg = self.link.callback(|_| Msg::Timeout);
                 self.timeout.spawn(Duration::from_secs(5), send_msg);
             }
             Msg::Timeout => {

examples/dashboard/src/lib.rs

@@ -87,7 +87,7 @@ impl Component for Model {
                 self.fetching = true;
                 let task = match format {
                     Format::Json => {
-                        let callback = self.link.send_back(
+                        let callback = self.link.callback(
                             move |response: Response<Json<Result<DataFromFile, Error>>>| {
                                 let (meta, Json(data)) = response.into_parts();
                                 println!("META: {:?}, {:?}", meta, data);
@@ -106,7 +106,7 @@ impl Component for Model {
                         }
                     }
                     Format::Toml => {
-                        let callback = self.link.send_back(
+                        let callback = self.link.callback(
                             move |response: Response<Toml<Result<DataFromFile, Error>>>| {
                                 let (meta, Toml(data)) = response.into_parts();
                                 println!("META: {:?}, {:?}", meta, data);
@@ -129,8 +129,8 @@ impl Component for Model {
             }
             Msg::WsAction(action) => match action {
                 WsAction::Connect => {
-                    let callback = self.link.send_back(|Json(data)| Msg::WsReady(data));
-                    let notification = self.link.send_back(|status| match status {
+                    let callback = self.link.callback(|Json(data)| Msg::WsReady(data));
+                    let notification = self.link.callback(|status| match status {
                         WebSocketStatus::Opened => Msg::Ignore,
                         WebSocketStatus::Closed | WebSocketStatus::Error => WsAction::Lost.into(),
                     });

examples/file_upload/src/lib.rs

@@ -48,10 +48,10 @@ impl Component for Model {
                 for file in files.into_iter() {
                     let task = {
                         if chunks {
-                            let callback = self.link.send_back(Msg::Chunk);
+                            let callback = self.link.callback(Msg::Chunk);
                             self.reader.read_file_by_chunks(file, callback, 10)
                         } else {
-                            let callback = self.link.send_back(Msg::Loaded);
+                            let callback = self.link.callback(Msg::Loaded);
                             self.reader.read_file(file, callback)
                         }
                     };

examples/futures/src/lib.rs

@@ -94,7 +94,7 @@ impl Component for Model {
                 };
                 self.link.send_future(future);
                 self.link
-                    .send_self(SetMarkdownFetchState(FetchState::Fetching));
+                    .send_message(SetMarkdownFetchState(FetchState::Fetching));
                 false
             }
         }

examples/game_of_life/src/lib.rs

@@ -155,8 +155,8 @@ impl Component for Model {
     type Message = Msg;
     type Properties = ();
 
-    fn create(_: Self::Properties, mut link: ComponentLink<Self>) -> Self {
-        let callback = link.send_back(|_| Msg::Tick);
+    fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
+        let callback = link.callback(|_| Msg::Tick);
         let mut interval = IntervalService::new();
         let handle = interval.spawn(Duration::from_millis(200), callback);
         Model {

examples/js_callback/src/lib.rs

@@ -43,7 +43,7 @@ impl Component for Model {
                 }
             }
             AsyncPayload => {
-                get_payload_later(self.link.send_back(Msg::Payload));
+                get_payload_later(self.link.callback(Msg::Payload));
                 false
             }
         }

examples/multi_thread/src/context.rs

@@ -37,7 +37,7 @@ impl Agent for Worker {
     fn create(link: AgentLink<Self>) -> Self {
         let mut interval = IntervalService::new();
         let duration = Duration::from_secs(3);
-        let callback = link.send_back(|_| Msg::Updating);
+        let callback = link.callback(|_| Msg::Updating);
         let task = interval.spawn(duration, callback);
         Worker {
             link,

examples/multi_thread/src/job.rs

@@ -37,7 +37,7 @@ impl Agent for Worker {
     fn create(link: AgentLink<Self>) -> Self {
         let mut interval = IntervalService::new();
         let duration = Duration::from_secs(3);
-        let callback = link.send_back(|_| Msg::Updating);
+        let callback = link.callback(|_| Msg::Updating);
         let task = interval.spawn(duration, callback);
         Worker {
             link,

examples/multi_thread/src/lib.rs

@@ -26,17 +26,17 @@ impl Component for Model {
     type Message = Msg;
     type Properties = ();
 
-    fn create(_: Self::Properties, mut link: ComponentLink<Self>) -> Self {
-        let callback = link.send_back(|_| Msg::DataReceived);
+    fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
+        let callback = link.callback(|_| Msg::DataReceived);
         let worker = native_worker::Worker::bridge(callback);
 
-        let callback = link.send_back(|_| Msg::DataReceived);
+        let callback = link.callback(|_| Msg::DataReceived);
         let job = job::Worker::bridge(callback);
 
-        let callback = link.send_back(|_| Msg::DataReceived);
+        let callback = link.callback(|_| Msg::DataReceived);
         let context = context::Worker::bridge(callback);
 
-        let callback = link.send_back(|_| Msg::DataReceived);
+        let callback = link.callback(|_| Msg::DataReceived);
         let context_2 = context::Worker::bridge(callback);
 
         Model {

examples/multi_thread/src/native_worker.rs

@@ -37,7 +37,7 @@ impl Agent for Worker {
     fn create(link: AgentLink<Self>) -> Self {
         let mut interval = IntervalService::new();
         let duration = Duration::from_secs(3);
-        let callback = link.send_back(|_| Msg::Updating);
+        let callback = link.callback(|_| Msg::Updating);
         let task = interval.spawn(duration, callback);
         Worker {
             link,

examples/npm_and_rest/src/lib.rs

@@ -33,11 +33,11 @@ impl Component for Model {
     type Message = Msg;
     type Properties = ();
 
-    fn create(_: Self::Properties, mut link: ComponentLink<Self>) -> Self {
+    fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
         Model {
             gravatar: GravatarService::new(),
             ccxt: CcxtService::new(),
-            callback: link.send_back(Msg::GravatarReady),
+            callback: link.callback(Msg::GravatarReady),
             profile: None,
             exchanges: Vec::new(),
             task: None,

examples/routing/src/b_component.rs

@@ -21,8 +21,8 @@ impl Component for BModel {
     type Message = Msg;
     type Properties = ();
 
-    fn create(_: Self::Properties, mut link: ComponentLink<Self>) -> Self {
-        let callback = link.send_back(|route: Route<()>| Msg::HandleRoute(route));
+    fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
+        let callback = link.callback(|route: Route<()>| Msg::HandleRoute(route));
         let mut router = Router::bridge(callback);
 
         router.send(Request::GetCurrentRoute);

examples/routing/src/lib.rs

@@ -32,8 +32,8 @@ impl Component for Model {
     type Message = Msg;
     type Properties = ();
 
-    fn create(_: Self::Properties, mut link: ComponentLink<Self>) -> Self {
-        let callback = link.send_back(|route: Route<()>| Msg::HandleRoute(route));
+    fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
+        let callback = link.callback(|route: Route<()>| Msg::HandleRoute(route));
         let router = router::Router::bridge(callback);
         Model {
             child: Child::Loading, // This should be quickly overwritten by the actual route.

examples/routing/src/router.rs

@@ -117,7 +117,7 @@ where
     type Output = Route<T>;
 
     fn create(link: AgentLink<Self>) -> Self {
-        let callback = link.send_back(|route_changed: (String, T)| {
+        let callback = link.callback(|route_changed: (String, T)| {
             Msg::BrowserNavigationRouteChanged(route_changed)
         });
         let mut route_service = RouteService::new();

examples/timer/src/lib.rs

@@ -27,7 +27,7 @@ impl Component for Model {
     type Message = Msg;
     type Properties = ();
 
-    fn create(_: Self::Properties, mut link: ComponentLink<Self>) -> Self {
+    fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
         // This callback doesn't send any message to a scope
         let callback = |_| {
             println!("Example of a standalone callback.");
@@ -39,8 +39,8 @@ impl Component for Model {
             timeout: TimeoutService::new(),
             interval,
             console: ConsoleService::new(),
-            callback_tick: link.send_back(|_| Msg::Tick),
-            callback_done: link.send_back(|_| Msg::Done),
+            callback_tick: link.callback(|_| Msg::Tick),
+            callback_done: link.callback(|_| Msg::Done),
             job: None,
             messages: Vec::new(),
             _standalone: Box::new(handle),

src/agent.rs

@@ -786,21 +786,20 @@ impl<AGN: Agent> AgentLink<AGN> {
         }
     }
 
-    /// Send response to an actor.
+    /// Send response to an agent.
     pub fn response(&self, id: HandlerId, output: AGN::Output) {
         self.responder.response(id, output);
     }
 
-    /// This method sends messages back to the component's loop.
-    pub fn send_back<F, IN>(&self, function: F) -> Callback<IN>
+    /// Create a callback which will send a message to the agent when invoked.
+    pub fn callback<F, IN>(&self, function: F) -> Callback<IN>
     where
         F: Fn(IN) -> AGN::Message + 'static,
     {
         let scope = self.scope.clone();
         let closure = move |input| {
             let output = function(input);
-            let msg = AgentUpdate::Message(output);
-            scope.clone().send(msg);
+            scope.send(AgentUpdate::Message(output));
         };
         closure.into()
     }

src/html/mod.rs

@@ -385,9 +385,9 @@ where
         }
     }
 
-    /// This method sends batch of messages back to the component's loop when the
-    /// returned callback is called.
-    pub fn send_back_batch<F, IN>(&mut self, function: F) -> Callback<IN>
+    /// This method creates a `Callback` which will send a batch of messages back to the linked
+    /// component's update method when called.
+    pub fn batch_callback<F, IN>(&self, function: F) -> Callback<IN>
     where
         F: Fn(IN) -> Vec<COMP::Message> + 'static,
     {
@@ -399,15 +399,16 @@ where
         closure.into()
     }
 
-    /// This method sends messages back to the component's loop when the returned callback is called.
-    pub fn send_back<F, IN>(&mut self, function: F) -> Callback<IN>
+    /// This method creates a `Callback` which will send a message to the linked component's
+    /// update method when invoked.
+    pub fn callback<F, IN>(&self, function: F) -> Callback<IN>
     where
         F: Fn(IN) -> COMP::Message + 'static,
     {
         let scope = self.scope.clone();
         let closure = move |input| {
             let output = function(input);
-            scope.clone().send_message(output);
+            scope.send_message(output);
         };
         closure.into()
     }
@@ -425,21 +426,17 @@ where
         use wasm_bindgen::JsValue;
         use wasm_bindgen_futures::future_to_promise;
 
-        let mut scope = self.scope.clone();
-
-        let js_future = async {
-            let message: COMP::Message = future.await;
-            // Force movement of the cloned scope into the async block.
-            let scope_send = move || scope.send_message(message);
-            scope_send();
+        let scope = self.scope.clone();
+        let js_future = async move {
+            scope.send_message(future.await);
             Ok(JsValue::NULL)
         };
         future_to_promise(js_future);
     }
 
     /// This method sends a message to this component to be processed immediately after the
     /// component has been updated and/or rendered.
-    pub fn send_self(&mut self, msg: COMP::Message) {
+    pub fn send_message(&mut self, msg: COMP::Message) {
         self.scope.send_message(msg);
     }
 
@@ -448,7 +445,7 @@ where
     ///
     /// All messages will first be processed by `update`, and if _any_ of them return `true`,
     /// then re-render will occur.
-    pub fn send_self_batch(&mut self, msgs: Vec<COMP::Message>) {
+    pub fn send_message_batch(&mut self, msgs: Vec<COMP::Message>) {
         self.scope.send_message_batch(msgs)
     }
 }

src/html/scope.rs

@@ -90,7 +90,7 @@ impl<COMP: Component> Scope<COMP> {
     }
 
     /// Schedules a task to send a message or new props to a component
-    pub(crate) fn update(&mut self, update: ComponentUpdate<COMP>) {
+    pub(crate) fn update(&self, update: ComponentUpdate<COMP>) {
         let update = UpdateComponent {
             shared_state: self.shared_state.clone(),
             update,
@@ -106,12 +106,12 @@ impl<COMP: Component> Scope<COMP> {
     }
 
     /// Send a message to the component
-    pub fn send_message(&mut self, msg: COMP::Message) {
+    pub fn send_message(&self, msg: COMP::Message) {
         self.update(ComponentUpdate::Message(msg));
     }
 
     /// Send a batch of messages to the component
-    pub fn send_message_batch(&mut self, messages: Vec<COMP::Message>) {
+    pub fn send_message_batch(&self, messages: Vec<COMP::Message>) {
         self.update(ComponentUpdate::MessageBatch(messages));
     }
 }

src/services/fetch.rs

@@ -155,12 +155,12 @@ impl FetchService {
     ///#     Error
     ///# }
     ///# fn dont_execute() {
-    ///# let mut link: ComponentLink<Comp> = unimplemented!();
+    ///# let link: ComponentLink<Comp> = unimplemented!();
     ///# let mut fetch_service: FetchService = FetchService::new();
     ///# let post_request: Request<Result<String, failure::Error>> = unimplemented!();
     /// let task = fetch_service.fetch(
     ///     post_request,
-    ///     link.send_back(|response: Response<Result<String, failure::Error>>| {
+    ///     link.callback(|response: Response<Result<String, failure::Error>>| {
     ///         if response.status().is_success() {
     ///             Msg::Noop
     ///         } else {
@@ -199,9 +199,9 @@ impl FetchService {
     /// }
     ///
     ///# fn dont_execute() {
-    ///# let mut link: ComponentLink<Comp> = unimplemented!();
+    ///# let link: ComponentLink<Comp> = unimplemented!();
     /// let get_request = Request::get("/thing").body(Nothing).unwrap();
-    /// let callback = link.send_back(|response: Response<Json<Result<Data, failure::Error>>>| {
+    /// let callback = link.callback(|response: Response<Json<Result<Data, failure::Error>>>| {
     ///     if let (meta, Json(Ok(body))) = response.into_parts() {
     ///         if meta.status.is_success() {
     ///             return Msg::FetchResourceComplete(body);
@@ -244,8 +244,8 @@ impl FetchService {
     ///# }
     ///# pub enum Msg {}
     ///# fn dont_execute() {
-    ///# let mut link: ComponentLink<Comp> = unimplemented!();
-    ///# let callback = link.send_back(|response: Response<Result<String, failure::Error>>| unimplemented!());
+    ///# let link: ComponentLink<Comp> = unimplemented!();
+    ///# let callback = link.callback(|response: Response<Result<String, failure::Error>>| unimplemented!());
     /// let request = fetch::Request::get("/path/")
     ///     .body(Nothing)
     ///     .unwrap();