Struct QueryHandlerRegistry

pub struct QueryHandlerRegistry { /* private fields */ }

The QueryHandlerRegistry struct manages the registration and retrieval of query handlers.

This registry maintains a mapping between query types and their corresponding handlers. It is used internally by the QueryBus to dispatch queries to the correct handler.

Implementations

impl QueryHandlerRegistry

QueryHandlerRegistry implementation.

pub fn new() -> Self

Creates a new, empty QueryHandlerRegistry.

Example

use discern::registry::QueryHandlerRegistry;

let registry = QueryHandlerRegistry::new();

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 to be registered for the query type Q.

This method associates a query type with its corresponding handler. When a query of type Q is dispatched, the QueryBus will use the handler registered here.

Example

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

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

Retrieves the query handler for a specific query type.

Returns

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

Example

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

let handler = registry.get_handler::<MyQuery>();
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.