I'm facing an error while I change the default event representation to Object array in this way:
Configuration configuration = new Configuration();
configuration.getEngineDefaults().getEventMeta().setDefaultEventRepresentation(EventUnderlyingType.OBJECTARRAY);
My events definitions are in create schema way. The epl file get successfully deploy, but when I insert a new Object[] event, an error rise telling that there are no event definition for this event name.
If more details are needed, please, ask for it.
After few tests, I can say that it's necessary to define every event type when the default event representation is set to object array.
Related
I want to build a CEP-Engine which is dynamic so you can add different event streams. As soon as a new stream is added, Esper should be able to read all the properties of the stream and put it into a list, for example. (For example integer id, long temperature, date timestamp etc.)
Is this possible in Esper?
Would be very grateful for any help
In order to add a stream at runtime you can use create-schema.
create schema MyStream(id int, ...)
For a stream that accepts events that an application sends using EPEventServive#sendEvent you should add the bus and public annotation (or set the equivalent compiler flags).
#public #buseventtype create schema MyStream(id int, ...)
You can now use this stream.
select * from MyStream
You can attach a listener and have it do some logic.
The Esper examples have a lot of detail. The create-schema is used in the "runtimeconfig" example.
Thank you for answering. I'm afraid I didn't make myself clear. I want to be able to add event streams where I don't know beforehand what kind of properties the events have. So I don't know before if there is an integer ID or if there is a date timestamp and which payload might be there. As soon as I add such an unknown event, Esper should examine the stream and return the contained properties of the stream to me.
I want to be able to add event streams where I don't know beforehand what kind of properties the events have. So I don't know before if there is an integer ID or if there is a date timestamp and which payload might be there. As soon as I add such an unknown event, Esper should examine the stream and return the contained properties of the stream to me.
Thank you very much. That actually helps me a lot. But a function which returns all property names directly does not exist, does it? So I would have to use dynamic parameters (trial and error) until I know which ones exist in the eventstream.
Thank you for your help :)
See similar to Add Sensorevents to CEP Engine and get a list of all properties
In the case that you don't have some or all of the properties, you can add the stream without any properties or with those properties that you know that the events have. Here is how to add a stream where you don't know any properties in advance:
#public #buseventtype create schema MyStream()
You can now use EPEventServive#sendEvent to send events.
You can use this stream in various ways. You can simply select the event.
select * from MyStream
Or you can use the dynamic property names, those with a '?' questionmark appended to them. This can refer to properties that may or may not exist.
select id? as id from MyStream
The "id?" returns an Object-type value. You can use "cast" to make it, for instance, a double-type value to total up.
select id? as id, sum(cast(someNumericProperty?, double)) as total from MyStream where
When the property doesn't exist the "?" expression returns null. There is an "exists" function that returns true when the parameter that is a dynamic property exists.
I don't think the Esper runtime actually knows about any dynamic property until the EPL attempts to use that dynamic property. The runtime doesn't inspect any event for actual properties.
You can add your own user-defined function that determines what the property names may be for your specific event underlying. So when the underlying is a java.util.Map the user-defined function can return "event.keySet()".
I am trying to set State property value of Test Case Work item. I am creating using TFS API and C# code.
It throws an error while I save the test case using Save() method. I have called the Validate() method of a work item and the ArrayList shows the value I am trying to assign is an invalid state.
testCase.State = TestPointState.Ready.ToString();
ArrayList result = testCase.WorkItem.Validate();
if (!testCase.WorkItem.IsValid())
{
//this block executes
}
When I manually opened the MTM to see what are the different STATE values for existing work items, then I found READY and DESIGN. That's why I tried t assign TestPointState.Ready enum. I tried assiging READY string directly in that statement, but still the same exception whlie saving the test case.
Any idea on how to fix this issue ?
It is possible that when setting the state another field has then an invalid input. e.g.: when you change from Ready to Design it might require that you select who the AssignTo person is and so you'll need to populate these fields as well. You can use the Validate method to get a list of invalid fields after you set the state like below.
ArrayList invalidFields = newWI.Validate();
This could be a very basic question, but hopefully someone will be able to answer it.
I am receiving messages (HL7) using a custom receive pipeline. Inside my custom pipeline, I am promoting properties into the context. I have set up a map where I need to access these properties. However, I would like to access these properties on the send side. The reason why it needs to be on the send side is because I am attaching my map to the send port, so I assume that the message will have already hit the MessageBox and will be mapped on the send side. Hopefully that makes sense...
I know that there are a few 3rd party tools I can use, but I was hoping that there's a simple functoid, or some code I can enter in a scripting functoid that will access the context for me.
Would someone be able to point me in the right direction with this?
There is, indeed a C# functoid that allows access to context properties but it seems to only work with maps on a Receive Port or inside an Orchestration.
You can use the Context Accessor Functiod to do this... Combine it's pipeline component with yours and it should work... Beware it should be handled within the same thread...
http://contextaccessor.codeplex.com/
I don't know if this is possible. However, I had a similar requirement to access message context properties and I was able to populate a message with the context properties in an orchestration thanks to
Greg.Forsythe's excellent instructions
I had a similar situation to access the context properties to get the filename property in the my map. I did the below steps without using any external functoids. Hope this helps someone
Steps:
create a new schema say "FileSchema"
FileNode(rootNode)
-FileName (fieldElement)
Click the schema and in the properties target namespace - clear the namespace.
make the FileName property distinguished. Rt.Click FileName and show promotions and add FileName to Distinguished property tab.
In your target schema, add the field FileName. for me I added it to a SQL schema, since I need the filename for every row in the database
In your orchestration, use the message assignment shape and type the below
// create a variable varFileXML of type System.XML.XMLDocument
// I'm creating a xml same like the file schema and loading that to the XML variable and then assigning that to the Message of type FileSchema
varFileXML = new System.Xml.XmlDocument();
varFileXML.LoadXml("<FileNode><FileName>FileName_0</FileName></FileNode>");
Msg_FileSchema = varFileXML;
//Get the FileName to a variable of string type
varFileName = Msg_FlatFileSchema(FILE.ReceivedFileName);
varFileName = System.IO.Path.GetFileName(varFileName);
//Access the filename property from the message and assign the variable to that
Msg_File.FileName = varFileName;
Now that we got the FileName in to the message you can use that in mapping to your target schema
I used a transform shape to create a new inline map with source as your target schema and fileschema together and the destination as the target schema.I mapped the filename from the fileschema to my target schema the filename property
this is one of the many ways to get the context property. Hope it helps
thanks & regards
Silam
preface note: I'm just starting to learn Grails, so I'm sure there are many other problems and room for optimization.
I've got two domains, a parent (Collection) and child (Event), in a one-to-many mapping. I'm trying to code an integration test for the deletion of children. Prior to the code in question, I've successfully created a parent and three children. The point where I'm having problems is getting a single child in preparation to delete it. The first line of my sample code is only there because of my rudimentary attempt to troubleshoot.
// lines 95-100 of my EventIntegrationTests.groovy file
// delete a single event
assertEquals("2nd Event", event2.title) // passes
def foundEvent = Event.get(event2.id) // no apparent problems
assertEquals("2nd Event", foundEvent.title) // FAILS (line #98)
foundEvent.delete()
assertFalse Event.exists(foundEvent.id)
The error message I'm getting is:
Cannot get property 'title' on null object
java.lang.NullPointerException: Cannot get property 'title' on null object
at edu.learninggrails.EventIntegrationTests.testEventsDelete(EventIntegrationTests.groovy:98)
What should my next troubleshooting steps be? (Since the first assertEquals passes, event2 is clearly not null, so at this point I have no idea how to troubleshoot the failure of the second assertEquals.)
This is not evident from the code: did you persist event2 by calling save()? Get will try to retrieve it from the persistent storage (the in-memory database for example) and if the event wasn't saved, the retrieved instance will be null.
If you did save it, did the save go through OK? Calling event.save() will return false if there was something wrong while saving the item (like a validation error). Lastly, you might try calling event.save(flush:true) in case the Hibernate session doesn't handle this case as you might expect (I'm not entirely sure about this one, but it can't hurt to try).
Try to print or inspect the event2.id on line 97 and check if you actually have an id, if so check if you actually get an Event object on line 97.
I dont think you saved the parent and its children successfully. after you save, you should make sure that every object that was persisted has a non null id, in your test.
What you are seeing is you created the event2 with a title, but didnt save it. It passes the first assertion because you created it. When you do the get, null is returned because your save failed.
in general for DAO integration tests i do the following
Setup -- create all objects Ill use in the test.
Save -- assert that all ids on saved objects are NOT null.
Clear the hibernate session -- this is important because if you don't do it, objects can be in the session from the previous operations. In your real world scenario, you are probably going to start with a find, i.e. an empty session. In other words, you are not going to start with anything in the session. If you are you need to adjust this rule so that the session in the test, when you start the actual testing part, is the same as the session of the code in the wild
Load the objects on which you want to operate and do what you need to do.