Hello BurstUser, You need to keep in mind that the returned code is not parsed into javascript object by some mechanism that is native to the browser. The returned string is parsed in javascript, so it is not uncommon that complex objects take several seconds to parse. I've run into this problem on several occasions and depending on the severity found two solutions that worked for me:
1. change the list into an array and see if that gets parsetimes into an acceptable range 2. return a single, delimited string and split it appart on the client with a regular expression. On Oct 18, 2:46 pm, BurstUser <[email protected]> wrote: > Hi all, > > I'm having issues with a very slow AsyncCallback method. > > My set up is as follows: > > // CLIENT CODE: > > System.out.println("ONE: "+System.currentTimeMillis()/1000F); > final AsyncCallback callback = new AsyncCallback(){ > public void onSuccess(Object result){ > > System.out.println("THREE: "+System.currentTimeMillis()/ > 1000F); > > dataList = (List<String>) result; > createTable(dataList); > } > public void onFailure(Throwable caught){ > Window.alert(caught.toString()); > } > //Call to openFile service on server > fileService.openFile(fileType,fileName,callback) > > } > > // SERVER SIDE CODE: > public List<String> openFile(int fileType, String fileName){ > File file = new File(fileName); > FileInputStream fin = null; > byte[] bytes = new byte[(int) file.length()]; > try{ > fin = new FileInputStream(file); > fin.read(bytes); > String s = new String(bytes); > doStuff(s); > fin.close(); > }catch(FileNotFoundException fnfe){ > fnfe.printStackTrace(); > }catch(IOException ioe){ > ioe.printStackTrace(); > } > > System.out.println("TWO: "+System.currentTimeMillis()/1000F); > > return dataStringList; > > } > > I'm running the application in development mode. > The openFile() method on the server returns an ArrayList<String> > called dataStringList, which has 57217 String objects within it. > > My console output is: > ONE: 1287402660233 > TWO: 1287402660597 > THREE: 1287402836619 > > The elapsed time between the System.out.print statements, ONE and TWO > is 0.364 seconds. > In contrast, the elapsed time between TWO and THREE is 176 seconds > (close to 3 minutes), which is far too long for simply processing a > file of 164kb in size. > > When I run the application with a smaller data set - with a file size > of 4kb - the elapsed time between TWO and THREE is 1.03 seconds. > > Any pointers or suggestions as to where the time lag could be would be > much appreciated. > Thanks! -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
