Function: OnQuery()

function OnQuery(type: QueryType): MessagingHandlerDecorator;

Defined in: src/wirestate-core/plugin/queries/on-query.ts:87

Marks an injectable service method as a provision-scoped query handler.

Parameters

Parameter	Type	Description
type	QueryType	Query token.

Returns

MessagingHandlerDecorator

Method decorator.

Remarks

The handler is registered when the owning container is provisioned and unregistered when that provision cycle ends. Register QueriesPlugin on the container, or on an ancestor container, to enable query handlers.

Queries answer read-oriented requests. One query call goes to one handler: the newest registered handler for the query token.

Example

import { Injectable, OnQuery } from "@wirestate/core";

@Injectable()
class UserProfileService {
  private readonly avatars = new Map<string, string>();

  @OnQuery("GET_USER_AVATAR")
  public onGetUserAvatar(userId: string): string {
    return this.avatars.get(userId) ?? "";
  }
}