xviz/docs/api-reference/parse-xviz.md

parseStreamMessage

import {parseStreamMessage, LOG_STREAM_MESSAGE} from '@xviz/parser';

parseStreamMessage({
  message,
  onResult: data => {
    switch (data.type) {
      case LOG_STREAM_MESSAGE.METADATA: // do something
      case LOG_STREAM_MESSAGE.TIMESLICE: // do something
      case LOG_STREAM_MESSAGE.INCOMPLETE: // do something
    }
  },
  onError: console.error,
  worker: true
  maxConcurrency: 4
});

Parameters:

• opts (Object)
  • message (Object|String|ArrayBuffer) - XVIZ message to decode.
  • onResult (Function) - callback if the message is parsed successfully. Receives a single argument data. data.type is one of LOG_STREAM_MESSAGE.
  • onError (Function) - callback if the parser encouters an error.
  • debug (Function) - callback to log debug info.
  • worker (Boolean|String) - use Web Wroker to parse the message. Enabling worker is recommended to improve loading performance in production. Default false.
    • boolean: whether to use the default worker. Note that callbacks in XVIZ config are ignored by the default worker. If you need to inject custom hooks into the parsing process, create a custom worker using streamDataWorker.
    • string: a custom worker URL to use.
  • maxConcurrency (Number) - the max number of workers to use. Has no effect if worker is set to false. Default 4.
  • capacity (Number) - the limit on the number of messages to queue for the workers to process, has no effect if set ot null. Default null.

LOG_STREAM_MESSAGE

Enum of stream message types.

• METADATA
• TIMESLICE
• ERROR
• INCOMPLETE
• DONE

streamDataWorker (experimental)

Create a custom worker for message parsing. This allows an app to inject callback hooks into the parsing process.

// worker.js
import {streamDataWorker} from './stream-data-worker';

streamDataWorker({
  preProcessPrimitive: primitive => {
    if (primitive.type === 'circle') {
      primitive.center[2] += 0.1;
    }
  }
})(self);

streamDataWorker(config)

Returns a function that initializes a WorkerGlobalScope to talk to the XVIZ parser on the main thread.

Parameters:

• config (Object) - an XVIZ config object.