Hello everybody,
I've been making a lot of progress in my project, however, once again I
faced many problems.
When I chose to use GWT, I didn't think that I would have so much trouble
facing Javascript codes.
Just to be clear, I'm using Google Cloud Endpoints APIs + GWT, and as you
know, Google Endpoints API access is made via Javascript.
So, here is my problem.
I have an API that should retrieve a list of objects. Example of code:
@ApiMethod(name = "listDeviceInfo")
public CollectionResponse<DeviceInfo> listDeviceInfo(
@Nullable @Named("cursor") String cursorString,
@Nullable @Named("limit") Integer limit) {
EntityManager mgr = null;
Cursor cursor = null;
List<DeviceInfo> execute = null;
try {
mgr = getEntityManager();
Query query = mgr
.createQuery("select from DeviceInfo as DeviceInfo");
if (cursorString != null && cursorString != "") {
cursor = Cursor.fromWebSafeString(cursorString);
query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
}
if (limit != null) {
query.setFirstResult(0);
query.setMaxResults(limit);
}
execute = (List<DeviceInfo>) query.getResultList();
cursor = JPACursorHelper.getCursor(execute);
if (cursor != null)
cursorString = cursor.toWebSafeString();
// Tight loop for fetching all entities from datastore and accomodate
// for lazy fetch.
for (DeviceInfo obj : execute)
;
} finally {
mgr.close();
}
return CollectionResponse.<DeviceInfo> builder().setItems(execute)
.setNextPageToken(cursorString).build();
}
But how do I access this API through Javascript?
Well, with a little help from a Google API, I can simply call:
gapi.client.deviceinfoendpoint
.listDeviceInfo()
.execute(
function(deviceInfoItems, deviceInfoItemsRaw) {
errorResult = checkErrorResponse(deviceInfoItems,
deviceInfoItemsRaw);
if (errorResult.isError) {
showError("There was a problem contacting the server when
attempting to list the registered devices. "
+ "Please refresh the page and try again in a short
while. Here's the error information:<br/> "
+ errorResult.errorMessage);
} else {
//Do something with deviceInfoItems.items
}
});
I know how to call this javascript function inside my GWT code using a
native method. However, I want to create a List of DeviceInfo objects with
the results of this Query inside my GWT Java code, and then I'll be able to
manipulate them into a Flex or Grid.
Is that even possible? How could I do that?
I appreciate any help.
Best Regards.
Em segunda-feira, 10 de fevereiro de 2014 22h31min23s UTC-2, Bruno Brito
escreveu:
>
> Hey guys, this is my first post here, so I'm sorry if I'm not clear enough
> about my question.
>
> Well, basically what I want to do is:
> - Create a website using GWT and deploy it to App Engine in order to use
> the datastore. I've already done it, nothing wrong about it.
> - The second part of this project is about building an Android App which
> can access the same datastore that I use for my GWT project. Read the
> entities and retrieve them to display on the screen. And also use Google
> Cloud Messaging.
>
>
> The problems are:
> - I've noticed that there is Google Mobile Backend Starter which already
> deploys a backend to AppEngine and allows Cloud Messaging and many other
> features. But, how would I link GWT to this same application at GAE? If I
> deploy my GWT project, I lose the Android one.
> - I was also following this guide here:
> https://developers.google.com/appengine/docs/java/endpoints/getstarted/backend/setupin
> order to create my own backend, deploy it to AppEngine and then use the
> client endpoints with Javascript. However, if I do this, I can't deploy my
> GWT website to this app engine application.
>
> I don't know if I was clear enough. I've searched the group and saw some
> posts similar to my question, but none was very clear about it.
>
> I'll be glad if anyone can help.
>
> Thanks!
>
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