how i could know when all the files have been finished uploading

[lingyulin]

how I could know when all the files have been finished uploading
or how to know how many files are beeing uploading

int fileCount = ??;
int i;
final Object obj = new Object();
req.uploadHandler(new Handler() {
@OverRide
public void handle(HttpServerFileUpload event) {
upload.streamToFileSystem(...);
i++;
if(fileCount == i)
obj.notify();
}
});
synchronized(obj){
obj.wait();
}
//all the files has been finished uploading