You have to accept the asynchronous nature of RPC-Requests in GWT and
stop trying to build smth. synchronous around them. This code:
-----------------------------------
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();
-----------------------------------
should not be executed in the onload-routine but in the
onResponseReceived()-method (or in any other procedure that you call
out of it).
On 10 Nov., 07:12, mives29 <[EMAIL PROTECTED]> wrote:
> 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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