I want a service that i can host in a cloud simulated environment e.g eucalyptus. This service should be consumed by clients and ensures that l can collect adequate data that l can use to model an anomaly detector.
Eucalyptus is API-compatible with AWS, so you can do with it anything you would do on Amazon's cloud, except you host it on your own compute infrastructure. In particular, you can use AWS-compatible tools like vagrant to automate the provisioning/management/monitoring of the VMs. Any custom code you write will work with both AWS and Eucalyptus.
As far as I have seen, People tend to use EUCALYPTUS, for deploying Web based Application /Service where they evaluate characteristics of Cloud such as Scaling.
I think for your question, You shall develop a Web Service or use a Standard Application such as JPETStore & deploy in the Cloud.
I dont have idea about anomaly detector, how ever If you have idea to evaluate and identify about Users of that Web Service, You shall go for Log Analytics , from which a pattern shall be obtained.