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add SharedObjectContext example to cart_object.rs #240

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add SharedObjectContext example to cart_object.rs #240

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17 changes: 17 additions & 0 deletions rust/tutorials/tour-of-restate-rust/src/part4/cart_object.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,9 @@ pub(crate) trait CartObject {
async fn checkout() -> Result<bool, HandlerError>;
#[name = "expireTicket"]
async fn expire_ticket(ticket_id: String) -> Result<(), HandlerError>;

#[shared]
async fn list() -> Result<String, HandlerError>;
}

pub struct CartObjectImpl;
Expand Down Expand Up @@ -100,4 +103,18 @@ impl CartObject for CartObjectImpl {

Ok(())
}

async fn list(
&self,
ctx: SharedObjectContext<'_>
) -> Result<String, HandlerError> {
let mut tickets = ctx
.get::<Json<HashSet<String>>>("tickets")
.await?
.unwrap_or_default()
.into_inner();

let tickets_vec: Vec<String> = tickets.into_iter().collect();
Ok(tickets_vec.join(","))
}
}