[−][src]Trait melib::backends::BackendOp

pub trait BackendOp: Debug + Send {
    fn as_bytes(&mut self) -> ResultFuture<Vec<u8>>;
    fn fetch_flags(&self) -> ResultFuture<Flag>;
}

A BackendOp manages common operations for the various mail backends. They only live for the duration of the operation. They are generated by the operation method of Mailbackend trait.

Motivation

We need a way to do various operations on individual mails regardless of what backend they come from (eg local or imap).

Creation

/* Create operation from Backend */

let op = backend.operation(message.hash(), mailbox.hash());

Example

use melib::backends::{BackendOp};
use melib::Result;
use melib::{Envelope, Flag};

#[derive(Debug)]
struct FooOp {}

impl BackendOp for FooOp {
    fn as_bytes(&mut self) -> Result<&[u8]> {
        unimplemented!()
    }
    fn fetch_flags(&self) -> Result<Flag> {
        unimplemented!()
    }
}

let operation = Box::new(FooOp {});