@xlit/mediator

Command and query mediator

Installation

``sh
npm i @xlit/mediator
`

Getting started

Define command handler with decorator.

`typescript
import { commandHandler } from '@xlit/mediator';

class FooCommand {
kind = 'FooCommand';
}

@commandHandler('FooCommand')
class FooCommandHandler {
handle(cmd: FooCommand): Promise {
// do something
}
}
`

Define query handler with decorator.

`typescript
import { queryHandler } from '@xlit/mediator';

class BarQuery {
kind = 'BarQuery';
}

type BarDto = string;

@queryHandler('BarQuery')
class BarQueryHandler {
handle(query: BarQuery): Promise {
// do something
return Promise.resolve('barbar');
}
}
`

Send command and query

`ts
import { FooCommand } from './FooCommand.js';
import { BarQuery } from './BarQuery.js';

const mediator = Mediator.instance();

await mediator.send(new FooCommand()); // send command
const result = await mediator.send(new BarQuery()); // send query
``