hi all. ive re-done my code just a while ago(been a busy week) and my
code kinda bothers me. here's the code re-done:
Entrypoint onModuleLoad() method:
doc = getDoc(); //(where doc is a Document object)
String subject =
doc.getElementsByTagName("Image").item(0).getChildNodes().item(1).toString();
String subject2 =
doc.getElementsByTagName("Image").item(1).getFirstChild().getNodeValue();
Entrypoiny getDoc() method:
public Document getDoc() {
XmlParserUtil xmlParser = new XmlParserUtil("image_uris.xml");
int i = 0;
while (doc==null) {
doc = xmlParser.getDocument();
}
return doc;
}
here's the service implementation:
public class XmlParserUtil {
String url;
Document doc;
RequestBuilder requestBuilder;
public String xmlStr;
public XmlParserUtil(String xmlFileName) {
this.url = xmlFileName;
}
public Document getDocument() {
RequestCallback xmlRcb = new RequestCallback()
{public void onResponseReceived(Request arg0, Response arg1) {
xmlStr = arg1.getText();
doc = XMLParser.parse(xmlStr);
}
public void onError(Request request, Throwable exception) {
// TODO Auto-generated method stub
}};
try {
requestBuilder = new
RequestBuilder(RequestBuilder.GET,url);
requestBuilder.sendRequest(null,xmlRcb);
}
catch (RequestException ex) {
GWT.log(ex.getMessage(), ex);
}
return doc;
}
}
my problem is on the Entrypoint logic. you see the getDoc() method
there?
it has this:
while (doc==null) {
doc = xmlParser.getDocument();
}
which just loops around until the service implementation has already
populated the parsed document.
what bothers me with this code is that it seems to break AJAX. the
execution "stays" here until the document object is not null anymore,
which kills the purpose of using AJAX (coz it seems not asynchronous
anymore).
is there any lister that i can implement on my entrypoint class that
"listens" if the service has already received a reply? (or a listener
of that sort)
thanks in advance.
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