in app/common/src/main/java/com/googlecodesamples/cloud/jss/common/config/BaseSubscriberConfig.java [41:46]
public void setParallelPull(Integer parallelPull) {
if (parallelPull <= 0) {
throw new IllegalArgumentException(ERROR_MSG_NEGATIVE_PARALLEL);
}
this.parallelPull = parallelPull;
}