IOrder.waitForUpdate() waits for state change, however, there's no unique state for fully filled orders (partially/fully filled orders share State.FILLED according to order state diagram)
To wait for full fill, I have to stay in a loop with timeout, waiting for order amount == requested amount. I'm wondering if there's a more efficient way to do this synchronously (i.e., without async notification from strategy's onMessage())

Thanks

When an order is fully filled onMessage will receive a message with IMessage.getReason() equal to ORDER_FULLY_FILLED
https://www.dukascopy.com/wiki/#Order_state

Thanks for the reply.
As stated in the original question, I want to block after submitting the order until the order is fully filled. I don't see how can this be done using onMessage() notification unless you mean I have to create and event, block on it, then set it from onMessage() when ORDER_FULLY_FILLED is received (I assume for this, onMessage() and onTick() run in two separate threads?)
Please clarify.

All IStrategy methods are executed in a thread safe way. onMessage will not execute before current onTick has finished.