code: public TaskSchedulerBuilder threadNamePrefix(String threadNamePrefix) {
  		return new TaskSchedulerBuilder(this.poolSize, this.awaitTermination,
  				this.awaitTerminationPeriod, threadNamePrefix, this.customizers);
  	}
docs: Set the prefix to use for the names of newly created threads.
  @param threadNamePrefix the thread name prefix to set
  @return a new builder instance