publisher_impl.h File Reference

Abstract base class for all transport-specific publisher implementations. More...

#include <chrono>
#include <memory>
#include "./node_impl.h"

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Classes
class	vlink::PublisherImpl
	Transport-agnostic base for publisher node implementations. More...

Namespaces
namespace	vlink

Detailed Description

Abstract base class for all transport-specific publisher implementations.

PublisherImpl is the intermediate layer between the generic Publisher<T> template and a concrete transport backend (e.g. DdsPublisherImpl, ShmPublisherImpl). It inherits from NodeImpl and adds publish-side semantics:

• Subscriber discovery and change notification via detect_subscribers() / update_subscribers().
• Blocking wait for at least one subscriber with wait_for_subscribers().
• Two write overloads: serialised Bytes for network transports and zero-copy IntraData for the intra:// backend.

Subscriber Discovery Flow

// Transport detects subscriber appearance or disappearance:
publisher_impl->update_subscribers();
//   -> compares has_subscribers() against cached state
//   -> notifies the condition variable
//   -> fires the ConnectCallback registered via detect_subscribers()

Note

Concrete subclasses must implement has_subscribers() and write(const Bytes&). write(const IntraData&) is only overridden by the intra:// backend; all other transports inherit the base no-op that logs a warning and returns false.