private static T TryParameterProvider<T>(
string name,
DataFlowOpInitializeContext context)
{
if (context.AdditionalParameters != null && context.AdditionalParameters.ContainsKey(name)) {
return (T) context.AdditionalParameters.Get(name);
}
if (context.ParameterProvider == null) {
return default(T);
}
EPDataFlowOperatorParameterProviderContext ctx =
new EPDataFlowOperatorParameterProviderContext(context, name);
object value = context.ParameterProvider.Provide(ctx);
if (value == null) {
return default(T);
}
var clazz = typeof(T);
if (TypeHelper.IsAssignmentCompatible(value.GetType(), clazz)) {
return (T) value;
}
throw new EPException(
"Parameter provider provided an unexpected object for parameter '" +
name +
"' of type '" +
value.GetType().Name +
"', expected type '" +
clazz.Name +
"'");
}
private void RunAssertionParameterInjectionCallback(EPServiceProvider epService)
{
epService.EPAdministrator.CreateEPL("create schema SomeType ()");
epService.EPAdministrator.CreateEPL("create dataflow MyDataFlowOne MyOp -> outstream<SomeType> {propOne:'abc', propThree:'xyz'}");
var myOp = new MyOp("myid");
var options = new EPDataFlowInstantiationOptions();
options.OperatorProvider(new DefaultSupportGraphOpProvider(myOp));
var myParameterProvider = new MyParameterProvider(Collections.SingletonDataMap("propTwo", "def"));
options.ParameterProvider(myParameterProvider);
Assert.AreEqual("myid", myOp.Id);
Assert.IsNull(myOp.PropOne);
Assert.IsNull(myOp.PropTwo);
epService.EPRuntime.DataFlowRuntime.Instantiate("MyDataFlowOne", options);
Assert.AreEqual("abc", myOp.PropOne);
Assert.AreEqual("def", myOp.PropTwo);
Assert.AreEqual(3, myParameterProvider.ContextMap.Count);
Assert.IsNotNull(myParameterProvider.ContextMap.Get("propOne"));
EPDataFlowOperatorParameterProviderContext context = myParameterProvider.ContextMap.Get("propTwo");
Assert.AreEqual("propTwo", context.ParameterName);
Assert.AreEqual("MyOp", context.OperatorName);
Assert.AreSame(myOp, context.OperatorInstance);
Assert.AreEqual(0, context.OperatorNum);
Assert.AreEqual(null, context.ProvidedValue);
Assert.AreEqual("MyDataFlowOne", context.DataFlowName);
context = myParameterProvider.ContextMap.Get("propThree");
Assert.AreEqual("propThree", context.ParameterName);
Assert.AreEqual("MyOp", context.OperatorName);
Assert.AreSame(myOp, context.OperatorInstance);
Assert.AreEqual(0, context.OperatorNum);
Assert.AreEqual("xyz", context.ProvidedValue);
epService.EPAdministrator.DestroyAllStatements();
}
public Object Provide(EPDataFlowOperatorParameterProviderContext context)
{
_contextMap.Put(context.ParameterName, context);
return(_values.Get(context.ParameterName));
}
public object Provide(EPDataFlowOperatorParameterProviderContext context)
{
return @params.Get(context.ParameterName);
}
