Grails execute service method after bootstrap completes

Question

Just a quick one to see whether it is possible to run a block of code after the bootstrap's init() has completed?

Hows the best way to go about it?

I have some external systems I need to connect to, and I want to show an 'index' page saying 'Connecting to sub systems' or something similar whilst this block completes, and then once its done the application works as normal.

Am I right in thinking you cant access a page until after bootstrap? Is there a simple way to restrict people accessing other parts of the system whilst this service runs? Does this seem feasible?

Cheers for any help!

Answer 1

Based on your requirement as you also pointed out bootstrap is not your friend. you need a view and controller for your screen and a service for your connection logic to external systems. You also need a flag or a method for sanity check of the communication within the scope of application or session. Then I would suggest to create a filter and check if you have the connections, if not redirect them to the controller that will connect it. Sudo:

class ConnectionFilters {
def filters = {
    loginCheck(controller: '*', action: '*') {
        before = {
            if (!session.connection ) {
                redirect(controller:'connection',action: 'connect')
                return false
            }
        }
    }
}

}

class controller {
    def connectionService
    def connect (){
        try {
            connectionService.connectTo('systemx')
            connectionService.connectTo('systemy')
            connectionService.connectTo('systemz')
        }
        catch(e){
            session.connection = false
            redirect view:'error'
        }
        session.connection = true
    }
}


class ConnectionService {
    def connectTo(systemname){
        ....
    }
}