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getCallback method

Function getCallback (int txid)

Returns the callback associated with the given response message.

Used by subclasses of Proxy<T> to retrieve registered callbacks when handling response messages.

Implementation

Function getCallback(int txid) {
  final Function result = _callbackMap.remove(txid);
  if (result == null) {
    proxyError('Message had unknown request id: $txid');
    return null;
  }
  return result;
}