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To have a better user experience with EAGLE ui, we could provide an interface to manage a certain topology via the ui page, such as submit a topology

Schema

Topology Definition 

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1. NEW
   1. create a topology definition entity
2. START
   1. click START button
   2. check the topology's current status on the nimbus host
   3. a new thread is created to execute the submitting topology task
   4. update status
3. STOP
   1. click STOP button
   2. check the topology's current status on nimbus host
   3. a new thread is created to stop the topology
   4. update status

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