Hi GWT Gurus,
I have a pretty fundamental question about how to design the server-side
of my system using RequestFactory. I'm sure I'm missing something pretty
obvious, so I apologize in advance for the stupidity of the question.
I have a server side entity (using Objectify for persistence),
@Entity
public class Foo {
@Id
private Long id;
private String name;
private int accumulator;
private List<Bar> bars = new ArrayList<Bar>();
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAccumulator() {
return accumulator;
}
public void setAccumulator(int accumulator) {
this.accumulator = accumulator;
}
public List<Bar> getBars() {
return new ArrayList<Bar>(bars);
}
public void setBars(List<Bar> bars) {
this.bars = new ArrayList<Bar>(bars);
}
}
@Embed
public class Bar {
private String baz;
public String getBaz() {
return baz;
}
public void setBaz(String baz) {
this.baz = baz;
}
}
And then the shared interfaces,
@ProxyFor(value=Foo.class, locator=FooLocator.class)
public interface FooProxy extends EntityProxy {
String getName();
void setName(String name);
int getAccumulator();
void setAccumulator(int accumulator);
List<Bar> getBars();
setBars(List<Bar> bars);
}
@ProxyFor(value=Bar.class)
public interface BarProxy extends ValueProxy {
String getBaz();
void setBaz(String baz);
}
So far, so good. The problem I have is that when the client modifies the
entity, when processing that action on the server side I need to be able to
see what the user has changed and "do things" based on what the user has
changed. E.g. if the stored list "bars" has been modified in the meantime,
I need to merge the users changes; I might want to ensure that the
accumulator only goes up -- that the user cannot set it to a value below
the value stored on the server side. Essentially, I want the 'stored'
version of the object and the 'modified' version of the object so I can
write code that merges the changes, applies any logic I might need, and
saves the object.
Any help on how to structure my code to allow this, would be much
appreciated.
Kind regards,
Rich
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