initial commit

exercises/07_threads/08_client/Cargo.toml

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+[package]
+name = "client"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+ticket_fields = { path = "../../../helpers/ticket_fields" }

exercises/07_threads/08_client/src/data.rs

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+use crate::store::TicketId;
+use ticket_fields::{TicketDescription, TicketTitle};
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct Ticket {
+    pub id: TicketId,
+    pub title: TicketTitle,
+    pub description: TicketDescription,
+    pub status: Status,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct TicketDraft {
+    pub title: TicketTitle,
+    pub description: TicketDescription,
+}
+
+#[derive(Clone, Debug, Copy, PartialEq, Eq)]
+pub enum Status {
+    ToDo,
+    InProgress,
+    Done,
+}

exercises/07_threads/08_client/src/lib.rs

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+use crate::data::{Ticket, TicketDraft};
+use crate::store::{TicketId, TicketStore};
+use std::sync::mpsc::{Receiver, Sender};
+
+pub mod data;
+pub mod store;
+
+#[derive(Clone)]
+// TODO: flesh out the client implementation.
+pub struct TicketStoreClient {}
+
+impl TicketStoreClient {
+    // Feel free to panic on all errors, for simplicity.
+    pub fn insert(&self, draft: TicketDraft) -> TicketId {
+        todo!()
+    }
+
+    pub fn get(&self, id: TicketId) -> Option<Ticket> {
+        todo!()
+    }
+}
+
+pub fn launch() -> TicketStoreClient {
+    let (sender, receiver) = std::sync::mpsc::channel();
+    std::thread::spawn(move || server(receiver));
+    todo!()
+}
+
+// No longer public! This becomes an internal detail of the library now.
+enum Command {
+    Insert {
+        draft: TicketDraft,
+        response_channel: Sender<TicketId>,
+    },
+    Get {
+        id: TicketId,
+        response_channel: Sender<Option<Ticket>>,
+    },
+}
+
+fn server(receiver: Receiver<Command>) {
+    let mut store = TicketStore::new();
+    loop {
+        match receiver.recv() {
+            Ok(Command::Insert {
+                draft,
+                response_channel,
+            }) => {
+                let id = store.add_ticket(draft);
+                let _ = response_channel.send(id);
+            }
+            Ok(Command::Get {
+                id,
+                response_channel,
+            }) => {
+                let ticket = store.get(id);
+                let _ = response_channel.send(ticket.cloned());
+            }
+            Err(_) => {
+                // There are no more senders, so we can safely break
+                // and shut down the server.
+                break;
+            }
+        }
+    }
+}

exercises/07_threads/08_client/src/store.rs

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+use crate::data::{Status, Ticket, TicketDraft};
+use std::collections::BTreeMap;
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct TicketId(u64);
+
+#[derive(Clone)]
+pub struct TicketStore {
+    tickets: BTreeMap<TicketId, Ticket>,
+    counter: u64,
+}
+
+impl TicketStore {
+    pub fn new() -> Self {
+        Self {
+            tickets: BTreeMap::new(),
+            counter: 0,
+        }
+    }
+
+    pub fn add_ticket(&mut self, ticket: TicketDraft) -> TicketId {
+        let id = TicketId(self.counter);
+        self.counter += 1;
+        let ticket = Ticket {
+            id,
+            title: ticket.title,
+            description: ticket.description,
+            status: Status::ToDo,
+        };
+        self.tickets.insert(id, ticket);
+        id
+    }
+
+    pub fn get(&self, id: TicketId) -> Option<&Ticket> {
+        self.tickets.get(&id)
+    }
+}

exercises/07_threads/08_client/tests/insert.rs

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+use client::data::{Status, TicketDraft};
+use client::launch;
+use ticket_fields::test_helpers::{ticket_description, ticket_title};
+
+#[test]
+fn insert_works() {
+    // Notice how much simpler the test is now that we have a client to handle the details!
+    let client = launch();
+    let draft = TicketDraft {
+        title: ticket_title(),
+        description: ticket_description(),
+    };
+    let ticket_id = client.insert(draft.clone());
+
+    let client2 = client.clone();
+    let ticket = client2.get(ticket_id).unwrap();
+    assert_eq!(ticket_id, ticket.id);
+    assert_eq!(ticket.status, Status::ToDo);
+    assert_eq!(ticket.title, draft.title);
+    assert_eq!(ticket.description, draft.description);
+}