Singleton registry for channel reducer functions. More...

#include <loader.h>

Public Member Functions
ReducerFn	get (const std::string &name) const
	Look up a reducer by name.

std::vector< std::string >	names () const
	List all registered reducer names, sorted.

void	register_reducer (const std::string &name, ReducerFn fn)
	Register a named reducer function.

Static Public Member Functions
static ReducerRegistry &	instance ()
	Get the singleton instance.

Detailed Description

Singleton registry for channel reducer functions.

Maps reducer names (used in JSON graph definitions) to ReducerFn implementations. Built-in reducers: "overwrite", "append".

ReducerRegistry::instance().register_reducer("sum",
    [](const json& current, const json& incoming) {
        return current.get<int>() + incoming.get<int>();
    });

Note: Legacy process-global convenience API.

ReducerRegistry, ConditionRegistry, and NodeFactory synchronize concurrent registration and lookup. Engines capture a registry snapshot at construction. Use an isolated GraphRegistry for separate engines: built-ins resolve by default, while singleton custom entries require explicit GlobalFallback.

Definition at line 42 of file loader.h.

Member Function Documentation

◆ get()

ReducerFn neograph::graph::ReducerRegistry::get ( const std::string & name ) const

Look up a reducer by name.

Parameters

name	Reducer name.

Returns: The ReducerFn, or throws if not found.

◆ instance()

static ReducerRegistry & neograph::graph::ReducerRegistry::instance ( )

static

Get the singleton instance.

Returns: Reference to the global ReducerRegistry.

◆ names()

std::vector< std::string > neograph::graph::ReducerRegistry::names ( ) const

List all registered reducer names, sorted.

Introspection accessor for external tooling (e.g. a visual topology editor) that needs to enumerate the available reducer palette without grepping engine source.

Returns: Sorted vector of reducer names.

◆ register_reducer()

void neograph::graph::ReducerRegistry::register_reducer	(	const std::string &	name,
		ReducerFn	fn
	)

Register a named reducer function.