compareTo method
比较优先级(用于排序)
Implementation
int compareTo(QueuedRequest other) {
// 优先级高的排前面
final priorityCompare = other.priority.value.compareTo(priority.value);
if (priorityCompare != 0) return priorityCompare;
// 相同优先级,先创建的排前面
return createdAt.compareTo(other.createdAt);
}