Re: Design: State Machine implementation in Apache Camel

[Imran Raza Khan]

I have change a design like below

I already have multiple camel sub routes which perform different actions,
now my requirement was to align those sub routes  in one flow for order
fulfillment.

1- For every new product i knew which sub routes suppose to be execute and
in which sequence, so i will save them in table and at start of application
will get load in HashMap or CacheManager.

2- Now for my all products i have pre decided sequence of sub routes(Each
sub route may have multiple integration with backend). Introduced new table
product_flow table

State Table:
"StateID" "STATE",   "NEXT_STATE",    "STATE_RESULT",       "CamelRoute"

    100          1       ,           2           ,    1          ,
 direct:initialValidation

    101          1       ,          10          ,   -1          ,
direct:sendNotification

    103         2       ,          10          ,    1          ,
direct:placeOrder

    104          10      ,            0          ,     1        ,
direct:sendNotification

- any flow can be made active or inactive, sometime legacy nodes suppose to
be bypass for any orders
Product Flow
"ProductId"  StateID  Status
2323              100      Active
2323              101      InActive
2424              100      Active
2424              104      Active



from("jetty:http://127.0.0.1:8383/request";)

// Now below line will get flow from product_flow table
.bean(OrderStateMachine.class, "loadOrderStateFlow(${body})")
//Execute all state/action/subroute sequence in below loop on base of their
status
                .loopDoWhile(simple("${body.NextState} == 0"))

                     .bean(OrderStateMachine.class,"getNextState(${body})")
                     .toD(simple("${body.State.CamelRoute}"))

                .end()

.log("Request Processed");