The SQL OFFSET keyword is evil. It basically behaves like SLEEP in other programming langauges: the bigger the number, the slower the execution. Fetching resul…
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The Apache module mod_bwshare throttles HTTP requests to Apache 1 and 2 servers for each client IP address independently.
The mod_bwshare module accepts or rejects HTTP requests from each client IP address based on past downloads by that client IP address.
If the HTTP client's download rate exceeds specified levels, the reponse to the HTTP client is an HTML warning message.
A human browser will see a warning message indicating how long to wait.
public class LazyLoad extends WebPage {
public LazyLoad() {
IColumn[] columns = new IColumn[] {
new PropertyColumn(new Model("col1"), "intValue"),
new PropertyColumn(new Model("col2"), "class") };
ISortableDataProvider dataProvider = new SortableDataProvider() {
public int size() {
return 300000;
}
public IModel model(Object object) {
return new Model((Integer) object);
}
public Iterator iterator(int first, int count) {
return loadEntriesFromDatabase(first, count).iterator();
}
private List<Integer> loadEntriesFromDatabase(int first, int count) {
List<Integer> items = new ArrayList<Integer>();
for (int i = 0; i < count; i++) {
items.add(new Integer(first + i));
}
return items;
}
};
DefaultDataTable t = new DefaultDataTable("t", columns, dataProvider, 3);
add(t);
}
}
V. Giraldo, L. Carvalho, und D. Tall. Proceedings of the 27 thAnnual Conference of the International Group for the Psychology of Mathematics Education, (2003)