rust/sat-rs
rust/sat-rs
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some clarifications

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Robin Müller 2022-10-29 01:16:00 +02:00
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fsrc-core/src/event_man.rs
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@ -1,24 +1,27 @@
//! Event management and forwarding
//!
//! This module provides components to perform event routing. The most important component for this
//! task is the [EventManager]. It has a map of event listeners and uses a dynamic [EventReceiver]
//! task is the [EventManager]. It uses a map of event listeners and uses a dynamic [EventReceiver]
//! instance to receive all events and then route them to event subscribers where appropriate.
//!
//! One common use case for satellite systems is to offer a light-weight publish-subscribe mechanism
//! and IPC mechanism for software and hardware events which are also packaged as telemetry.
//! This can be done with the [EventManager] like this:
//! and IPC mechanism for software and hardware events which are also packaged as telemetry or can
//! trigger a system response. This can be done with the [EventManager] like this:
//!
//! 1. Provide a concrete [SendEventProvider] implementation and a concrete [EventReceiver]
//! implementation. These abstraction allow to use different message queue backends.
//! A straightforward implementation where dynamic memory allocation is not a big concern could
//! use [std::sync::mpsc::channel] to do this. It is recommended that these implementations
//! derive [Clone].
//! 2. Each event creator gets a sender component which allows it to send events to the manager.
//! 3. The event manager receives all receiver ends so all events are routed to the
//! 2. Each event creator gets a (cloned) sender component which allows it to send events to the
//! manager.
//! 4. Each event receiver and/or subscriber gets a receiver component. The sender component is
//! used with the [SendEventProvider] trait and the subscription API provided by the
//! [EventManager] to subscribe for individual events, whole group of events or all events
//! 3. The event manager receives the receiver component so all events are routed to the
//! manager.
//! 4. Additional channels are created for each event receiver and/or subscriber.
//! The sender component is used with the [SendEventProvider] trait and the subscription API
//! provided by the [EventManager] to subscribe for individual events, whole group of events or
//! all events. The receiver/subscribers can then receive all subscribed events via the receiver
//! end.
//!
//! Some components like a PUS Event Service or PUS Event Action Service might require all
//! events to package them as telemetry or start actions where applicable.