Re: Problem with Asynchronous callback
I think you can trace what's going on by putting in a few calls to
Window.alert(). The calls to getLatLng() have to go across to
Google's servers and may take many milliseconds to return. You need
some kind of mechanism to make sure all of the LatLngCallbacks fire
before looking at listaCoordinateCittaUtente
On Mon, Mar 29, 2010 at 11:39 AM, Andrea andrea.mor...@gmail.com wrote:
I have the method getAddress() that take in input an array of cities.
For each city I use the Asyncronous method getLatLng() that return me
the coordinates and I save them in an ArrayList called
listaCoordinateCittaUtente.
But when I use the ArrayList after the call of the method getAddress()
it is empty.
I tried to resolve this problem with the Timer class but it isn't the
better solution.
How can I resolve this problem???
public void getAddress(String address[]){
final int nCicli=address.length;
for (int i = 0; i nCicli; i++) {
final String nomeCitta=address[i];
geocoder.getLatLng(nomeCitta, new LatLngCallback(){
public void onFailure(){
Window.alert(nomeCitta + non esiste);
}
public void onSuccess(LatLng point){
listaCoordinateCittaUtente.add(point);
map.addOverlay(new Marker(point));
map.setCenter(point);
}
});
}
}
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Re: Problem with Asynchronous callback
Hi Andrea,
I assume you mean the listaCoordinateCittaUtente list doesn't have any
data after this call? This is the point of an asynchronous call, you
can't predict how long the call will take to come back from the
server, so you actually need to design your app to use the data only
once it is completed. It looks like you sortof do that with
map.addOverlay, where you're doing something to your map is once the
call comes back; you need to consider the list in the same way. In
this case, it won't have the complete result until onSuccess has been
called nCicli times.
Also, if there really are many addresses, you would be much better off
making your RPC call take the entire list at once. For one, there are
only two connections allowed at a time, so making many calls will
quickly cause a bottleneck - one call will be much more efficient than
many. For two, I'm assuming you actually want to associate these
returned points with their addresses. There is no guarantee of the
order that onSuccess will be called with the return values, so even
once it is completely filled, lista... list won't be in the same order
as the address array. Finally, with one call you'll actually know for
sure when the operation is done - the single call of onSuccess.
jk
On Mar 29, 9:39 am, Andrea andrea.mor...@gmail.com wrote:
I have the method getAddress() that take in input an array of cities.
For each city I use the Asyncronous method getLatLng() that return me
the coordinates and I save them in an ArrayList called
listaCoordinateCittaUtente.
But when I use the ArrayList after the call of the method getAddress()
it is empty.
I tried to resolve this problem with the Timer class but it isn't the
better solution.
How can I resolve this problem???
public void getAddress(String address[]){
final int nCicli=address.length;
for (int i = 0; i nCicli; i++) {
final String nomeCitta=address[i];
geocoder.getLatLng(nomeCitta, new LatLngCallback(){
public void onFailure(){
Window.alert(nomeCitta + non esiste);
}
public void onSuccess(LatLng point){
listaCoordinateCittaUtente.add(point);
map.addOverlay(new Marker(point));
map.setCenter(point);
}
});
}
}
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Re: Problem with Asynchronous callback
Thanks for your answer.
It's only few days that I use this technology so please tell me how I
can make my RPC call takes the entire list at once.
I can't understand the first solution, can you give me an example of
it??
Andrea
On 29 Mar, 17:54, kozura koz...@gmail.com wrote:
Hi Andrea,
I assume you mean the listaCoordinateCittaUtente list doesn't have any
data after this call? This is the point of an asynchronous call, you
can't predict how long the call will take to come back from the
server, so you actually need to design your app to use the data only
once it is completed. It looks like you sortof do that with
map.addOverlay, where you're doing something to your map is once the
call comes back; you need to consider the list in the same way. In
this case, it won't have the complete result until onSuccess has been
called nCicli times.
Also, if there really are many addresses, you would be much better off
making your RPC call take the entire list at once. For one, there are
only two connections allowed at a time, so making many calls will
quickly cause a bottleneck - one call will be much more efficient than
many. For two, I'm assuming you actually want to associate these
returned points with their addresses. There is no guarantee of the
order that onSuccess will be called with the return values, so even
once it is completely filled, lista... list won't be in the same order
as the address array. Finally, with one call you'll actually know for
sure when the operation is done - the single call of onSuccess.
jk
On Mar 29, 9:39 am, Andrea andrea.mor...@gmail.com wrote:
I have the method getAddress() that take in input an array of cities.
For each city I use the Asyncronous method getLatLng() that return me
the coordinates and I save them in an ArrayList called
listaCoordinateCittaUtente.
But when I use the ArrayList after the call of the method getAddress()
it is empty.
I tried to resolve this problem with the Timer class but it isn't the
better solution.
How can I resolve this problem???
public void getAddress(String address[]){
final int nCicli=address.length;
for (int i = 0; i nCicli; i++) {
final String nomeCitta=address[i];
geocoder.getLatLng(nomeCitta, new LatLngCallback(){
public void onFailure(){
Window.alert(nomeCitta + non esiste);
}
public void onSuccess(LatLng point){
listaCoordinateCittaUtente.add(point);
map.addOverlay(new Marker(point));
map.setCenter(point);
}
});
}
}- Nascondi testo citato
- Mostra testo citato -
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Re: Problem with Asynchronous callback
Sync version:
ListLatLng getLatLngs(ListString addresses);
Async version:
void getLatLngs(ListString addresses, AsyncCallbackListLatLng
cb);
onSuccess(ListLatLng result)
{
listaCoordinateCittaUtente = result;
doStuffWithResults...;
}
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Re: Problem with Asynchronous callback
Andrea,
You must read the great beer analogy out here -
http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/faca1575f306ba0f?pli=1
--Sri
On 29 March 2010 22:47, kozura koz...@gmail.com wrote:
Sync version:
ListLatLng getLatLngs(ListString addresses);
Async version:
void getLatLngs(ListString addresses, AsyncCallbackListLatLng
cb);
onSuccess(ListLatLng result)
{
listaCoordinateCittaUtente = result;
doStuffWithResults...;
}
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