Origin

Injects the context where it was instantiated. Powerful when combined with @isolated.

import { application, contextualize, origin, provide, provider } from 'aspectra'
import { type Context, isolated } from 'aspectra'
 
enum ContextId {
  DATABASE = 'database',
  APPLICATION = 'application',
}
 
@isolated
@provider
class LoggerProvider {
  @origin
  private readonly origin!: Context
 
  public log(message: string) {
    console.log(`[${this.origin.id.toString()}]:`, message)
  }
}
 
@contextualize(ContextId.DATABASE)
@provider
class DatabaseProvider {
  @provide(LoggerProvider)
  private readonly logger!: LoggerProvider
 
  public connect() {
    this.logger.log('Connected to database')
  }
}
 
@contextualize(ContextId.APPLICATION, ContextId.DATABASE)
@application
class Application {
  @provide(LoggerProvider)
  private readonly logger!: LoggerProvider
 
  @provide(DatabaseProvider)
  private readonly database!: DatabaseProvider
 
  public start() {
    this.logger.log('Starting application')
    this.database.connect()
  }
}

[auto-generated] output:

[application]: Starting application
[database]: Connected to database