As its a mobile app you should always think about how to reduce server
requests by sending the server more information at once. Less requests =>
less latency in using your app.
For example the above 4 steps you have described can be done with a single
request:
Request: Client logs in: Client sends credentials *AND* current DB version
(0 = no DB yet)
Response: If credentials are valid, the server sends back SQL based on the
client db version (either full schema or just an upgrade or nothing at
all). If credentials are invalid, an HTTP error code will be send.
In the very rare cases where you really need to wait for a server response
before you can immediately (without user interaction required) fire the
next server request just use private methods to "flatten" the daisy
chaining a bit:
server.fetchFirstThing(new AsyncCallback() {
void onSuccess() {
fetchSecondThing();
}
}
But as mentioned, if no user interaction is required between requests,
there is a good chance that you can combine these requests into a single
one.
-- J.
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