adamtron / jycep Goto Github PK

I am trying to add user defined aggregation function to EsperEngine()

def add_plugin(self, name, plugin): self._esperService.getEPAdministrator().getConfiguration().addPlugInAggregationFunctionFactory(name, plugin)

and

from the sample code
http://esper.codehaus.org/esper-5.0.0/doc/reference/en-US/html/extension.html#custom-aggregation-single

I add following code to example.py
sys.path.append('./sample.jar') # this jar contains MyConcatAggregationFunctionFactory.class and MyConcatAggregationFunction.class

cep.add_plugin("concat","com.espertech.esper.example.runtimeconfig.MyConcatAggregationFunctionFactory)

However, when I run the example.py

Error walking statement [select concat(s) from BogusEvent.win:length(3) where P1 > 2.0]
java.lang.IllegalStateException: Error resolving aggregation: Could not load aggregation factory class by name 'com.espertech.esper.example.runtimeconfig.MyConcatAggregationFunctionFactory'

were outputted.

I am trying look at the source and found

this 2 line in com/espertech/esper/epl/agg/core/EngineImportServiceImpl.java will be the reason
ClassLoader cl = Thread.currentThread().getContextClassLoader();
clazz = Class.forName(className, true, cl);

Can you fix it??