Eclipse CD5405 Manuel d'utilisateur télécharger pdf (Page 17)

! ! ! System.out.println("File " + file.toString() + " found");

! ! ! try {

! ! ! ! // Open the file

! ! ! ! final BufferedReader in =

! ! ! ! ! new BufferedReader(new FileReader(file));

! ! ! ! // Identify the step handler for the steps assigned to this

! ! ! ! // agent.

! ! ! ! setItemHandlerFactory(new ItemHandlerFactory() {

! ! ! ! ! public ItemHandler createItemHandler(

! ! ! ! ! ! ! AgendaItem associatedItem) {

! ! ! ! ! ! return new

! ! ! ! ! ! StreamDischargeHandler(associatedItem, in);

!!!!!}

! ! ! ! });

! ! ! ! // Let us handle both new steps that are posted and ones

! ! ! ! // that existed before the agent was started.

! ! ! ! setProcessingMode(ProcessingMode.EXISTING_AND_NEW);

!!!!

! ! ! } catch (FileNotFoundException e) {

! ! ! ! // This shouldn't happen since we checked if the file

! ! ! ! // existed before trying to open it.

! ! ! ! System.out.println(

! ! ! ! ! "File " + file.toString() + " not found");

!!!}

! ! }

! ! else {

! ! ! // Report an error if we can't open the file.

! ! ! System.out.println("File " + file.toString() + " not found");

!!}

}

A handler is the object that actually performs the work of a step. Here is a handler that

corresponds with the agent above. The only step for which it does actual work is Read S.

For all other steps, it simply completes.

When the handler reaches the end of the file, it signals this to the process by throwing the

EndOfSetException. We should therefore modify our Little-JIL process to expect this

exception and handle it. In this case, the exception is thrown by the Read S step. Add a

declaration of EndOfSetException to the Read S step. Propagate it all the way to the root,

where you should add a complete handler. You should also define an EndOfSetException

Java class similar to our earlier exception.

Now that we have this way of detecting the end of the input, we should change the

cardinality on the connector between Get Q Dataset and Build Q so that it loops indefinitely.

To do this, select the connector. Change the cardinality to have a lower bound of Default

and an upper bound of Unlimited. The “2” on the edge should be replaced with a “+”,

meaning 1 or more executions of the substep are expected.

Here is the code for StreamDischargeHandler:

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Eclipse CD5405 Manuel d'utilisateur Page 17

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