Hands-On Microservices with Rust

Link to actor

The following struct wraps an address of CacheActor:

#[derive(Clone)]pub struct CacheLink {    addr: Addr<CacheActor>,}

The constructor only fills this addr field with an Addr value:

impl CacheLink {    pub fn new(addr: Addr<CacheActor>) -> Self {        Self { addr }    }}

We need a CacheLink wrapping struct to add methods to get access to caching features, but need to hide the implementation details and message interchange. First, we need a method to get cached values:

pub fn get_value(&self, path: &str) -> Box<Future<Item = Option<Vec<u8>>, Error = Error>> {    let msg = GetValue {        path: path.to_owned(),    };    let fut = self.addr.send(msg)        .from_err::<Error>()        .and_then(|x| x.map_err(Error::from));    Box::new(fut)}

The preceding function creates ...