270.8. 消息标头

Camel 将 Quartz Execution Context 中的 getters 添加为标头值。以下标头会被添加：
calendar, fireTime, jobDetail, jobInstance, jobRuntTime, mergedJobDataMap, nextFireTime, previousFireTime, refireCount, result, scheduledFireTime, scheduler, trigger, triggerName, triggerGroup.

fireTime 标头包含触发交换时的 java.util.Date。