Few things covered in this example:

1. Absolute minimum to build an Akka cluster

Here you can play with the cluster itself

• add node(start a new Akka.WidgetHolder copy)
• crash node(close the Akka.WidgetHolder)
• node recovery(restart the Akka.WidgetHolder node which you crashed)
• graceful stop(close the Akka.WidgetHolder with Ctrl+C)

2. Widget failover and work distribution logic:

• When Akka.RiskEngine starts it creates N widgets which are automatically created on the available Akka.WidgetHolder node in a round-robin fasion.
• When a new Akka.WidgetHolder node added the Akka.RiskEngine does widget rebalancing by destroying and recreating widgets
• When a known Akka.WidgetHolder node gracefully goes down(Ctrl+C) the Akka.RiskEngine failover recreate widgets on the available Akka.WidgetHolder nodes
• If there are no available Akka.WidgetHolder nodes, the Akka.RiskEngine keeps trying to recover the widgets

How to run:

1. Akka.RiskEngine node serves as a seed node configured to run on localhost:4053
2. Akka.WidgetHolder node serves as a widget container configured to run on localhost:4054(every new node sould use its own static port)