def processes(opts={})

      wfids = @context.storage.expression_wfids(opts)

      opts[:count] ? wfids.size : ProcessStatus.fetch(@context, wfids, opts)
    end
def processes(opts={})

      wfids = @context.storage.expression_wfids(opts)

      opts[:count] ? wfids.size : ProcessStatus.fetch(@context, wfids, opts)
    end
Returns an array of ProcessStatus instances.

 WARNING : this is an expensive operation, but it understands :skip
 and :limit, so pagination is our friend.

 Please note, if you're interested only in processes that have errors,
 Engine#errors is a more efficient means.

 To simply list the wfids of the currently running, Engine#process_wfids
 is way cheaper to call.