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| title | weight |
|---|---|
| Messaging | 100 |
Headers
message.h
Defines the core message model. etl::imessage is the base interface (virtual or non-virtual, depending onETL_HAS_VIRTUAL_MESSAGES).etl::message<ID>provides typed messages with static IDs. Type traits (is_message,is_message_type, etc.) and ID comparison utilities support compile-time validation.message_router.h
Definesetl::imessage_router, the central routing interface with receive, accepts, and router identity. Provides message_router<TDerived, ...> that statically dispatches by message ID (contiguous IDs optimized). Includes null_message_router and message_producer helpers, plus send_message utilities.message_bus.h
Implementsetl::imessage_bus, a router that manages a sorted list of subscribed routers and forwards messages based on destination ID (broadcast or addressed). Supports subscription limits and forwards to successors.message_broker.h
Implements etl::message_broker, a router with explicit subscription objects mapping routers to message ID lists (span). It routes only to subscribers that match both message ID and destination ID, then forwards to any successor.message_packet.h
A type-erased, in-place container for a fixed set of message types. Validates message ID acceptance, supports copy/move, and exposesget()asetl::imessage&. Uses aligned storage sized to the largest message type.shared_message.h
Reference-counted wrapper around pooled messages (ireference_counted_message_pool). Supports copy/move semantics with automatic release when the last reference drops.
Basic architecture
