snapshot method
      
Future<Snapshot> 
snapshot(
    
- SnapshotJobRequest request,
 - String projectId,
 - String location,
 - String jobId, {
 - String? $fields,
 
Snapshot the state of a streaming job.
request - The metadata request object.
Request parameters:
projectId - The project which owns the job to be snapshotted.
location - The location that contains this job.
jobId - The job to be snapshotted.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a Snapshot.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<Snapshot> snapshot(
  SnapshotJobRequest request,
  core.String projectId,
  core.String location,
  core.String jobId, {
  core.String? $fields,
}) async {
  final body_ = convert.json.encode(request);
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ = 'v1b3/projects/' +
      commons.escapeVariable('$projectId') +
      '/locations/' +
      commons.escapeVariable('$location') +
      '/jobs/' +
      commons.escapeVariable('$jobId') +
      ':snapshot';
  final response_ = await _requester.request(
    url_,
    'POST',
    body: body_,
    queryParams: queryParams_,
  );
  return Snapshot.fromJson(response_ as core.Map<core.String, core.dynamic>);
}