Struct QueryHandlerRegistry 

pub struct QueryHandlerRegistry { /* private fields */ }

The QueryHandlerRegistry manages associations between query types and their handlers.

It provides a type-safe way to register handlers for specific query types and retrieve them when needed for data query operations.

Implementations

impl QueryHandlerRegistry

Implementation for QueryHandlerRegistry.

pub fn new() -> Self

Creates an empty registry for query handlers.

pub fn register<Q: Query>(&mut self, handler: impl QueryHandler<Q> + 'static)

Registers a query handler for a specific query type.

Arguments

• handler - The handler implementation to register for query type Q.

When queries of type Q are dispatched, the registered handler will be used.

Example

let mut registry = QueryHandlerRegistry::new();
registry.register(FindProductQueryHandler);

pub fn get_handler<Q: Query>(&self) -> Option<Box<dyn QueryHandler<Q>>>

Retrieves the handler for a specific query type.

Returns

An Option containing the query handler if one is registered for type Q, or None if no handler is known for this query type.

Example

let mut registry = QueryHandlerRegistry::new();
registry.register(FindProductQueryHandler);

let handler = registry.get_handler::<FindProductQuery>();
assert!(handler.is_some());

Trait Implementations

impl Debug for QueryHandlerRegistry

Debug implementation for QueryHandlerRegistry

fn fmt(&self, f: &mut Formatter<'_>) -> FormatterResult

Formats the value using the given formatter.

impl Default for QueryHandlerRegistry

fn default() -> QueryHandlerRegistry

Returns the “default value” for a type.