Hi Izak,
you do not have to manage the session for yourself. Tapestry will take care of
this.
I wrote a example, how your code could be. It is handwritten in notepad, not
checked and I am new to Tapestry, but I think it should work :)
in hivemind.xml:
<!-- tell tapestry to take care of your order-object in the session -->
<contribution configuration-id="tapestry.state.ApplicationObjects">
<state-object name="shoppingCard" scope="session">
<create-instance class="yourPackage.MyShoppingCard"/>
</state-object>
</contribution>
your ShoppingCard-Object (the one stored in the session later)
public class MyShoppingCard implements Serializable {
private Order order = null ;
public Order getOrder { return this.order ; }
public void setOrder(Order order) { this.order = order ; }
}
Your order object stored in the card:
public class Order implements Serializable {
private ArrayList<OrderLineItem> orderLineItems = new
ArrayList<OrderLineItem>() ;
public Order()
public void addItem(OrderLineItem item) {
orderLineItems.add(item) ;
}
public void setUser( ...
... and so on ... :)
}
in your page.java (to get access to your ShoppingCard object):
@InjectState("shoppingCard")
public abstract MyShoppingCard getShoppingCard() ;
// if you want to check if the ShoppingCard already exists, without creating a
session:
@InjectStateFlag("shoppingCard")
public abstract boolean getShoppingCardExists() ;
public void addALineItem(OrderLineItem item) {
// create a session if none exists and/or initialize your order-object
...
if (!getShoppingCardExists() || (null==getShoppingCard().getOrder()))
getShoppingCard().setOrder(new Order()) ;
// add a line to the card ...
getShoppingCard().getOrder().addItem(item) ;
...
}
public void saveCard() {
try {
saveTheOrderToDB_or_something_like_this(getShoppingCard().getOrder()) ;
// now set the order to null, to start with a fresh
order-object (so the ShoppingCard object may still exits, but without an order
...
getShoppingCard().setOrder(null) ;
} catch ( ......
}
Hope this helps,
Gerald
>
>Hello,
>
>In my application I am saving an "Order" into the user's session. An order
>consists of an
>"OrderCart" which contains a bunch of "OrderLineItem" objects. Now when the
>user creates
>a new order, a new "Order" object is being generated and saved as such in
>the database,
>but as soon as I add items to the "OrderCart" , then the "OrderItems" from
>the previous order are still in the users session.
>
>So basically, I need to clear my "OrderCart" so that when a new order is
>being created, that it keeps the correct "OrderLineItems" associated with
>the corresponding order.
>
>Just a side note : In the "Managing Server Side State" on the Tapestry home
>page, they
>talk about setting the page to "Pristine State". Does that apply to my
>situation?
>
>Thanks,
>
>-- Izak
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