Hi All!
I'm new to GWT and I have a little problem. I'm trying to modify one
of Google example apps - the dynamic table witch a school schedule.
The data in the example is generated randomly. I modified it so the
data in the table is from the JDO database. What I want to do is to
modify the code, so the rows in the table will be updated when there
is a change in the database, beacause right now they aren't updating.
Here's the server side application code:
public class RankTableServiceImpl extends RemoteServiceServlet
implements
RankTableService {
private static final Person[] NO_PEOPLE = new Person[0];
private static final int MAX_PEOPLE = 100;
private final List<Person> people = new ArrayList<Person>();
Query query;
List<User> results;
PersistenceManager pm = PMF.get().getPersistenceManager();
public RankTableServiceImpl() {
generateUserList();
}
public Person[] getPeople(int startIndex, int maxCount) {
int peopleCount = people.size();
int start = startIndex;
if (start >= peopleCount) {
return NO_PEOPLE;
}
int end = Math.min(startIndex + maxCount, peopleCount);
if (start == end) {
return NO_PEOPLE;
}
int resultCount = end - start;
Person[] results = new Person[resultCount];
for (int from = start, to = 0; to < resultCount; ++from, ++to) {
results[to] = people.get(from);
}
return results;
}
@Override
protected void onAfterResponseSerialized(String serializedResponse)
{
System.out.println(serializedResponse);
}
private void generateUserList() {
int i = 0;
String login;
String money;
User element;
int cash;
query = pm.newQuery(User.class);
results = (List<User>) query.execute();
Iterator<User> itr = results.iterator();
Collections.sort(results, new MoneyComparator());
while (i != results.size())
{
if (i == MAX_PEOPLE) break;
Person person = new Person();
person.setPosition(Integer.toString(i+1));
if(itr.hasNext())
{
element = itr.next();
login = element.getLogin();
cash = element.getMoney();
money = Integer.toString(cash);
}
person.setLogin(login);
person.setMoney(money);
people.add(person);
i++;
}
}
}
and the client side applicatin code:
public class RankTableWidget extends Composite {
public class RankProvider implements DynaTableDataProvider {
private final RankTableServiceAsync rankService;
private int lastMaxRows = -1;
private Person[] lastPeople;
private int lastStartRow = -1;
public RankProvider() {
rankService = (RankTableServiceAsync) GWT.create
(RankTableService.class);
ServiceDefTarget target = (ServiceDefTarget) rankService;
String moduleRelativeURL = GWT.getModuleBaseURL() + "ranktable";
target.setServiceEntryPoint(moduleRelativeURL);
}
public void updateRowData(final int startRow, final int maxRows,
final RowDataAcceptor acceptor) {
if (startRow == lastStartRow) {
if (maxRows == lastMaxRows) {
pushResults(acceptor, startRow, lastPeople);
return;
}
}
rankService.getPeople(startRow, maxRows, new AsyncCallback<Person
[]>(){
public void onFailure(Throwable caught) {
acceptor.failed(caught);
}
public void onSuccess(Person[] result) {
lastStartRow = startRow;
lastMaxRows = maxRows;
lastPeople = result;
pushResults(acceptor, startRow, result);
}
});
}
private void pushResults(RowDataAcceptor acceptor, int startRow,
Person[] people) {
String[][] rows = new String[people.length][];
for (int i = 0, n = rows.length; i < n; i++) {
Person person = people[i];
rows[i] = new String[3];
rows[i][0] = person.getPosition();
rows[i][1] = person.getLogin();
rows[i][2] = person.getMoney();
}
acceptor.accept(startRow, rows);
}
}
private final RankProvider rankProvider = new RankProvider();
private final DynaTableWidget dynaTable;
public RankTableWidget(int visibleRows) {
String[] columns = new String[] {"Position", "Nick", "Sum"};
String[] styles = new String[] {"pos", "nick", "sum"};
dynaTable = new DynaTableWidget(rankProvider, columns, styles,
visibleRows);
initWidget(dynaTable);
}
@Override
protected void onLoad() {
dynaTable.refresh();
}
}
Please tell me, how should I modify the code to make the table update?
I think it's the matter of modifying the getPeople() function so I
don't need to paste the rest of the code (correct me if I'm wrong)
Regards, Przemek
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