comctx/examples/worker-transfer/src/service/adapter.ts

Cross-context RPC solution with type safety and flexible adapters.

import { Adapter, SendMessage, OnMessage } from 'comctx'

declare const self: DedicatedWorkerGlobalScope

export class ProvideAdapter implements Adapter {
  sendMessage: SendMessage = (message, transfer) => {
    // Core will automatically extract transferables and pass as second parameter
    self.postMessage(message, transfer)
  }

  onMessage: OnMessage = (callback) => {
    const handler = (event: MessageEvent) => {
      callback(event.data)
    }
    self.addEventListener('message', handler)
    return () => self.removeEventListener('message', handler)
  }
}

export class InjectAdapter implements Adapter {
  worker: Worker

  constructor(path: string | URL) {
    this.worker = new Worker(path, { type: 'module' })
  }

  sendMessage: SendMessage = (message, transfer) => {
    // Core will automatically extract transferables and pass as second parameter
    this.worker.postMessage(message, transfer)
  }

  onMessage: OnMessage = (callback) => {
    const handler = (event: MessageEvent) => {
      callback(event.data)
    }
    this.worker.addEventListener('message', handler)
    return () => this.worker.removeEventListener('message', handler)
  }
}