Order Shipping is an example how state machine concepts can be used with a process of building a simple order processing system.
Below you can see a statechart driving this order shipping sample.
What is happening a above statechart:
-
Machine enters
WAIT_NEW_ORDERdefault state. -
Event
PLACE_ORDERtransitions into stateRECEIVE_ORDERand entry actionentryReceiveOrderis executed. -
If order is OK machine goes into two regions one handling order
production and one handling user level payment, else machine goes
into
CUSTOMER_ERRORfinal state. -
Machine will loop in a lower region to remind user of a payment
until
RECEIVE_PAYMENTis sent successfully to indicate correct payment. -
Both regions will go into waiting states
WAIT_PRODUCTandWAIT_ORDERto be joined before parent orthogonal stateHANDLE_ORDERis exited. -
Finally machine goes via
SHIP_ORDERinto its final stateORDER_SHIPPED.
Let’s get into actual demo. Run the boot based sample application:
# java -jar spring-statemachine-samples-ordershipping-1.2.8.RC4.jar
In a browser you see something shown above. You can start by choosing customer and order and create a machine.
Machine for particular order is now created and you can start to play with placing an order and sending a payment. Other settings like makeProdPlan, produce and payment allows you to control how machine works.
Finally you can see what machine does by refreshing a page.
