Struct ExchangeEnvelope 

pub struct ExchangeEnvelope {
    pub exchange: Exchange,
    pub reply_tx: Option<Sender<Result<Exchange, CamelError>>>,
}

A message sent from a consumer to the route pipeline.

Fire-and-forget exchanges use reply_tx = None. Request-reply exchanges (e.g. direct:) provide a reply_tx so the pipeline result can be sent back to the consumer.

Fields

exchange: Exchange

reply_tx: Option<Sender<Result<Exchange, CamelError>>>