Transport-neutral base for field-model getter (latest-value reader) implementations. 更多...

#include "./node_impl.h"

getter_impl.h 的引用(Include)关系图:

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类
class	vlink::GetterImpl
	Field-model receive base class shared by every transport-specific getter. 更多...

命名空间
	vlink

详细描述

Transport-neutral base for field-model getter (latest-value reader) implementations.

This is an internal implementation header used by the public Getter template; applications should depend on getter.h instead. GetterImpl extends NodeImpl with the field-model receive semantics: a single value is tracked per topic, and the getter is notified whenever the matching SetterImpl writes a new value. Optional latency / loss tracking mirrors the interface found on SubscriberImpl so that both receivers expose the same diagnostics.

ImplType: The constructor stamps impl_type with kGetter, which the discovery and recording layers use to label outputs originating from this node.

Lifecycle

Constructed by the matching Conf::create_getter().
listen() is called by the public Getter once the user installs a callback; is_listened flips to true on success.
init() / deinit() inherited from NodeImpl bring the underlying transport up and tear it down.
set_latency_and_lost_enabled() may be toggled before or after listening.

Role table

Capability	Provider
Wire receive callback	Subclass override of `listen()`
Latency / loss reporting	Subclass override of the optional getters
Listen state flag	`is_listened` (set by `Getter`)

Internal API contract

Method	Default	Subclass duty
`listen(MsgCallback&&)`	Pure virtual	Bind transport callback
`set_latency_and_lost_enabled(bool)`	No-op	Toggle tracking
`is_latency_and_lost_enabled() const`	Returns `false`	Report tracking state
`get_latency() const`	Returns `0`	Latest measured latency
`get_lost() const`	Returns zero `SampleLostInfo`	Cumulative loss stats

类

命名空间

详细描述