Question

我以下列格式从模拟中接收数据：可以看出，目前有两辆车从7号街到11号街（因为它们穿过许多区域，传感器放置在这些区域以监控运动）。

现在我想在汽车＃1和汽车＃2之间的最新时差仅为3秒或更短时停止信号。我怎样才能在esper查询语言中做到这一点。我必须编写复杂事件处理的查询，这将使我在满足上述条件时立即生成事件。从数据可以看出，最初汽车＃1进入7号街的时间是42500，而当＃2汽车进入7号街时，时间是42508，时差为8秒。

    { time: 42500,
      location: { Zone: 'Z3', Street: 'Street#7' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42502,
      location: { Zone: 'Z5', Street: 'Street#7' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42502,
      location: { Zone: 'Z1', Street: 'Street#8' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42504,
      location: { Zone: 'Z4', Street: 'Street#8' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42505,
      location: { Zone: 'Z5', Street: 'Street#8' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42505,
      location: { Zone: 'Z1', Street: 'Street#9' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42507,
      location: { Zone: 'Z4', Street: 'Street#9' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42508,
      location: { Zone: 'Z3', Street: 'Street#7' },
      carID: 'car#2' }
    ---------------------------------------
    { time: 42508,
      location: { Zone: 'Z5', Street: 'Street#9' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42508,
      location: { Zone: 'Z1', Street: 'Street#10' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42509,
      location: { Zone: 'Z4', Street: 'Street#10' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42509,
      location: { Zone: 'Z5', Street: 'Street#7' },
      carID: 'car#2' }
    ---------------------------------------
    { time: 42509,
      location: { Zone: 'Z1', Street: 'Street#8' },
      carID: 'car#2' }
    ---------------------------------------
    { time: 42511,
      location: { Zone: 'Z5', Street: 'Street#10' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42511,
      location: { Zone: 'Z1', Street: 'Street#11' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42511,
      location: { Zone: 'Z4', Street: 'Street#8' },
      carID: 'car#2' }
    ---------------------------------------
    { time: 42512,
      location: { Zone: 'Z4', Street: 'Street#11' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42512,
      location: { Zone: 'Z5', Street: 'Street#8' },
      carID: 'car#2' }
    ---------------------------------------
    { time: 42512,
      location: { Zone: 'Z1', Street: 'Street#9' },
      carID: 'car#2' }
    ---------------------------------------
    { time: 42513,
      location: { Zone: 'Z5', Street: 'Street#11' },
      carID: 'car#1' }
    ---------------------------------------
    { time: 42513,
      location: { Zone: 'Z1', Street: 'Street#12' },
      carID: 'car#1' }
    ---------------------------------------

Answer 1

这听起来有点像汽车1的事件与汽车2的事件的结合。问题是然后要加入的事件的子集。用例似乎需要保留每辆车访问过的街道历史。为此，我们可以使用长度窗口或独特窗口或这些窗口的并集。让我们使用一个考虑最近10个街道或事件的长度窗口。例如，像这样的查询：

--no-stop-slow-scripts

使用Esper查询语言对道路上的汽车进行拥塞控制查询

1 个答案: