initial commit

exercises/07_threads/07_ack/src/lib.rs

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+use std::sync::mpsc::{Receiver, Sender};
+use crate::store::TicketStore;
+
+pub mod data;
+pub mod store;
+
+// Refer to the tests to understand the expected schema.
+pub enum Command {
+    Insert { todo!() },
+    Get { todo!() }
+}
+
+pub fn launch() -> Sender<Command> {
+    let (sender, receiver) = std::sync::mpsc::channel();
+    std::thread::spawn(move || server(receiver));
+    sender
+}
+
+// TODO: handle incoming commands as expected.
+pub fn server(receiver: Receiver<Command>) {
+    let mut store = TicketStore::new();
+    loop {
+        match receiver.recv() {
+            Ok(Command::Insert {}) => {
+                todo!()
+            }
+            Ok(Command::Get {
+                todo!()
+            }) => {
+                todo!()
+            }
+            Err(_) => {
+                // There are no more senders, so we can safely break
+                // and shut down the server.
+                break
+            },
+        }
+    }
+}