我正在使用WSO2 CEP 4.2.0版本,我正在编写一个执行计划,用于通过Siddhi查询检查来自不同传感器的坐标何时变化不超过4米 . 但是得到一个错误:'distance'既不是函数扩展,也不是执行计划“ExecutionPlan”中的聚合属性扩展 .
我已经安装了GPL - Siddhi Geo Extension,但我不知道为什么会出现这个错误 . 请帮我解决这个错误 .
我的执行计划如下:
/* Enter a unique ExecutionPlan */
@Plan:name('ExecutionPlan')
/* Enter a unique description for ExecutionPlan */
-- @Plan:description('ExecutionPlan')
/* define streams/tables and write queries here ... */
@Import('SR_ProcessedStream:1.0.0')
define stream srprocessedstream (meta_resultTime long, meta_procedure string, correlation_latitude double, correlation_longitude double);
@Import('MPD_ProcessedStream:1.0.0')
define stream mpdprocessedstream (meta_resultTime long, meta_procedure string, correlation_latitude double, correlation_longitude double);
@Import('GBSS_ProcessedStream:1.0.0')
define stream gbssprocessedstream (meta_resultTime long, meta_procedure string, correlation_latitude double, correlation_longitude double);
@Export('measuredStream:1.0.0')
define stream measuredStream (meta_procedure1 string, meta_procedure2 string);
define table sensorTable(meta_procedure string, correlation_latitude double, correlation_longitude double);
from gbssprocessedstream
select meta_procedure, correlation_latitude, correlation_longitude
insert into sensorTable;
from mpdprocessedstream
select meta_procedure, correlation_latitude, correlation_longitude
insert into sensorTable;
from srprocessedstream
select meta_procedure, correlation_latitude, correlation_longitude
insert into sensorTable;
from gbssprocessedstream join sensorTable
on sensorTable.meta_procedure != gbssprocessedstream.meta_procedure and 4 > geo : distance (sensorTable.correlation_latitude, sensorTable.correlation_longitude, meta_procedure1.correlation_latitude, meta_procedure1.correlation_longitude)
select sensorTable.meta_procedure as meta_procedure1, gbssprocessedstream.meta_procedure as meta_procedure2
insert into measuredStream;
提前致谢!
2 回答
问题在于official installation instructions提供的已编译的p2-repo不是最新的,并且 missing 下面的距离函数是带有相关jar文件的图像
要使用此功能,您需要build the p2-repo并安装它,它应该工作!编译完所有三个项目后,您应该在目录
wso2-gpl/carbon-event-processing-extensions/repository/target
中看到p2-repo希望能帮助到你!
distance是 Function 扩展名(与 Stream Processor 扩展名类型相反) . 请参阅Siddhi Extensions doc,其中显示了每种类型的用法 .
如上文所述,函数扩展必须应用于
select
语句 . 观察到此错误是因为函数扩展应用于其他位置(在join
条件中) .