class SidekiqUniqueJobs::Middleware::Client

def call(*)

Other tags:
    Yield: - when the lock is successful
    Yield: - when uniqueness is disable

Other tags:
    See: https://github.com/mperham/sidekiq/wiki/Middleware -
    See: https://github.com/mperham/sidekiq/wiki/Job-Format -
    See: SidekiqUniqueJobs::Middleware#call - 
def call(*)
  lock { yield }
end