Use immutable collections in section_runner

src/section_runner.rs

@@ -2,7 +2,6 @@ use crate::model::SectionRef;
 use crate::option_future::OptionFuture;
 use crate::section_interface::SectionInterface;
 use std::{
-    collections::VecDeque,
     mem::swap,
     sync::{
         atomic::{AtomicI32, Ordering},
@@ -62,7 +61,7 @@ type SectionEventSend = broadcast::Sender<SectionEvent>;
 const EVENT_CAPACITY: usize = 8;
 
 #[derive(Clone, Debug, PartialEq)]
-enum RunState {
+pub enum SecRunState {
     Waiting,
     Running {
         start_time: Instant,
@@ -75,13 +74,13 @@ enum RunState {
     },
 }
 
-#[derive(Debug)]
-struct SecRun {
+#[derive(Clone, Debug)]
+pub struct SecRun {
     handle: SectionRunHandle,
     section: SectionRef,
     duration: Duration,
     total_duration: Duration,
-    state: RunState,
+    state: SecRunState,
 }
 
 impl SecRun {
@@ -91,17 +90,34 @@ impl SecRun {
             section,
             duration,
             total_duration: duration,
-            state: RunState::Waiting,
+            state: SecRunState::Waiting,
         }
     }
 
-    fn is_running(&self) -> bool {
-        matches!(self.state, RunState::Running{..})
+    pub fn is_running(&self) -> bool {
+        matches!(self.state, SecRunState::Running{..})
     }
 
     #[allow(dead_code)]
-    fn is_paused(&self) -> bool {
-        matches!(self.state, RunState::Paused{..})
+    pub fn is_paused(&self) -> bool {
+        matches!(self.state, SecRunState::Paused{..})
+    }
+}
+
+pub type SecRunQueue = im::Vector<Arc<SecRun>>;
+
+#[derive(Clone, Debug)]
+pub struct SecRunnerState {
+    run_queue: SecRunQueue,
+    paused: bool,
+}
+
+impl Default for SecRunnerState {
+    fn default() -> Self {
+        Self {
+            run_queue: SecRunQueue::default(),
+            paused: false,
+        }
     }
 }
 
@@ -110,7 +126,6 @@ struct RunnerTask {
     msg_recv: mpsc::Receiver<RunnerMsg>,
     running: bool,
     delay_future: OptionFuture<tokio::time::Delay>,
-    paused: bool,
     event_send: Option<SectionEventSend>,
     quit_tx: Option<oneshot::Sender<()>>,
 }
@@ -125,7 +140,6 @@ impl RunnerTask {
             msg_recv,
             running: true,
             delay_future: None.into(),
-            paused: false,
             event_send: None,
             quit_tx: None,
         }
@@ -153,8 +167,9 @@ impl RunnerTask {
         }
     }
 
-    fn start_run(&mut self, run: &mut SecRun) {
-        use RunState::*;
+    fn start_run(&mut self, run: &mut Arc<SecRun>) {
+        use SecRunState::*;
+        let run = Arc::make_mut(run);
         debug!(section_id = run.section.id, "starting running section");
         self.interface
             .set_section_state(run.section.interface_id, true);
@@ -164,12 +179,13 @@ impl RunnerTask {
         self.send_event(SectionEvent::RunStart(run.handle.clone()));
     }
 
-    fn finish_run(&mut self, run: &mut SecRun) {
+    fn finish_run(&mut self, run: &mut Arc<SecRun>) {
+        let run = Arc::make_mut(run);
         if run.is_running() {
             debug!(section_id = run.section.id, "finished running section");
             self.interface
                 .set_section_state(run.section.interface_id, false);
-            run.state = RunState::Finished;
+            run.state = SecRunState::Finished;
             self.send_event(SectionEvent::RunFinish(run.handle.clone()));
         } else {
             warn!(
@@ -180,18 +196,20 @@ impl RunnerTask {
         }
     }
 
-    fn cancel_run(&mut self, run: &mut SecRun) {
+    fn cancel_run(&mut self, run: &mut Arc<SecRun>) {
+        let run = Arc::make_mut(run);
         if run.is_running() {
             debug!(section_id = run.section.id, "cancelling running section");
             self.interface
                 .set_section_state(run.section.interface_id, false);
         }
-        run.state = RunState::Cancelled;
+        run.state = SecRunState::Cancelled;
         self.send_event(SectionEvent::RunCancel(run.handle.clone()));
     }
 
-    fn pause_run(&mut self, run: &mut SecRun) {
-        use RunState::*;
+    fn pause_run(&mut self, run: &mut Arc<SecRun>) {
+        use SecRunState::*;
+        let run = Arc::make_mut(run);
         let new_state = match run.state {
             Running { start_time } => {
                 debug!(section_id = run.section.id, "pausing running section");
@@ -217,8 +235,9 @@ impl RunnerTask {
         self.send_event(SectionEvent::RunPause(run.handle.clone()));
     }
 
-    fn unpause_run(&mut self, run: &mut SecRun) {
-        use RunState::*;
+    fn unpause_run(&mut self, run: &mut Arc<SecRun>) {
+        use SecRunState::*;
+        let run = Arc::make_mut(run);
         match run.state {
             Paused {
                 start_time,
@@ -244,10 +263,10 @@ impl RunnerTask {
         }
     }
 
-    fn process_queue(&mut self, run_queue: &mut VecDeque<SecRun>) {
-        use RunState::*;
-        while let Some(current_run) = run_queue.front_mut() {
-            let run_finished = match (&current_run.state, self.paused) {
+    fn process_queue(&mut self, state: &mut SecRunnerState) {
+        use SecRunState::*;
+        while let Some(current_run) = state.run_queue.front_mut() {
+            let run_finished = match (&current_run.state, state.paused) {
                 (Waiting, false) => {
                     self.start_run(current_run);
                     self.delay_future = Some(delay_for(current_run.duration)).into();
@@ -280,14 +299,14 @@ impl RunnerTask {
             };
 
             if run_finished {
-                run_queue.pop_front();
+                state.run_queue.pop_front();
             } else {
                 break;
             }
         }
     }
 
-    fn handle_msg(&mut self, msg: Option<RunnerMsg>, run_queue: &mut VecDeque<SecRun>) {
+    fn handle_msg(&mut self, msg: Option<RunnerMsg>, state: &mut SecRunnerState) {
         let msg = msg.expect("SectionRunner channel closed");
         use RunnerMsg::*;
         trace!(msg = debug(&msg), "runner_task recv");
@@ -295,12 +314,14 @@ impl RunnerTask {
             Quit(quit_tx) => {
                 self.quit_tx = Some(quit_tx);
                 self.running = false;
-            },
+            }
             QueueRun(handle, section, duration) => {
-                run_queue.push_back(SecRun::new(handle, section, duration));
+                state
+                    .run_queue
+                    .push_back(Arc::new(SecRun::new(handle, section, duration)));
             }
             CancelRun(handle) => {
-                for run in run_queue {
+                for run in state.run_queue.iter_mut() {
                     if run.handle != handle {
                         continue;
                     }
@@ -309,19 +330,19 @@ impl RunnerTask {
                 }
             }
             CancelAll => {
-                let mut old_runs = VecDeque::new();
-                swap(&mut old_runs, run_queue);
+                let mut old_runs = SecRunQueue::new();
+                swap(&mut old_runs, &mut state.run_queue);
                 trace!(count = old_runs.len(), "cancelling all runs");
                 for mut run in old_runs {
                     self.cancel_run(&mut run);
                 }
             }
             Pause => {
-                self.paused = true;
+                state.paused = true;
                 self.send_event(SectionEvent::RunnerPause);
             }
             Unpause => {
-                self.paused = false;
+                state.paused = false;
                 self.send_event(SectionEvent::RunnerUnpause);
             }
             Subscribe(res_send) => {
@@ -336,15 +357,15 @@ impl RunnerTask {
         let span = trace_span!("runner_task");
         let _enter = span.enter();
 
-        let mut run_queue: VecDeque<SecRun> = VecDeque::new();
+        let mut state = SecRunnerState::default();
 
         while self.running {
-            self.process_queue(&mut run_queue);
+            self.process_queue(&mut state);
             let delay_done = || {
                 trace!("delay done");
             };
             tokio::select! {
-                msg = self.msg_recv.recv() => self.handle_msg(msg, &mut run_queue),
+                msg = self.msg_recv.recv() => self.handle_msg(msg, &mut state),
                 _ = &mut self.delay_future, if self.delay_future.is_some() => delay_done()
             };
         }