Is this 'concrete type' als valid for a DTO object in GWT-RPC?
For example, I have a TestDTO object, which needs to be transferred via
GWT-RPC.
*public class TestDTO implements IsSerializable { public
ArrayList<String> data; public List<String> operation() {
return null; }}*
If I understand correctly, data field needs to be a concrete type. How
about the method operation, can I return here a generic List interface?
Best regards,
Hua
On Thursday, January 26, 2012 at 2:57:33 PM UTC+1 [email protected] wrote:
>
>
> On Thursday, January 26, 2012 1:58:14 PM UTC+1, tanteanni wrote:
>>
>> at the beginning of my gwt adventure i read somewhere that it is better
>> to use concrete classes for interfaces like lists, because the gwt compiler
>> must generate java script for every kind of list.
>> Is this (still) true?
>>
>
> Only on GWT-RPC, and yes it's still true. If you say
> you're transferring SomeObject via RPC, GWT has to compile the code for
> every class it knows that extends SomeObject, so you can safely send and
> receive SomeOtherObject (provided "class SomeOtherObject extends
> SomeObject"). So if you say java.util.List, GWT will grab
> java.util.Collections.SingletonList, java.util.Collections.EmptyList,
> java.util.Collections.ImmutableList, java.util.Arrays.ArrayList,
> java.util.ArrayList, java.util.LinkedList, etc. whereas if you say
> java.util.ArrayList, it reduces the number of classes that you app has to
> know about.
>
> You can safely use java.util.List everywhere else in your code, just not
> in your method declarations in your GWT-RPC interfaces.
>
> BTW, AutoBeans and RequestFactory only allow java.util.List and
> java.util.Set (and java.util.Map for AutoBeans), not java.util.ArrayList,
> java.util.HashSet or java.util.HashMap for instance.
>
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