I have found it convenient to make AIDL interfaces in pairs -- one for
how the client calls the server, and one by which a server can call
back into the client. However, I find that the design of the Proxy/
Stub model (which I confess I don't fully grasp) causes me issues in
the method I use to have a client identify itself.
I have calls in the server interface where the client hands in a
reference to its CLIENT interface (which is convenient, as they are
all Parcelable). If the server ever decides it wants to call back to
the client, it simply calls methods on this interface. HOWEVER...
each time an interface is handed in to the server, it arrives in
server space as a new stub -- there is no means by which they can be
compared against each other and so each client appears new and
distinct every time it calls a function on the server.
Is there any way I can see which of these interfaces are for the same
client, or do I have to code up my own Parcelable class that has a
unique hash of some kind? For instance, do instances of the "same"
interface already HAVE a hash function on them that would return the
same value?
e,g.: if I do this...
ServiceConnection serviceConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName name, IBinder
service)
{
myService =
IMyService.Stub.asInterface((IBinder)service);
try {
myService.registerClient(myClientInterface);
myService.doubleCheckThatClientHandle(myClientInterface);
} catch (RemoteException e) {
}
}
public void onServiceDisconnected(ComponentName name) {
myService = null;
}
};
and the server's implementation of registerClient() and
doubleCheckThatClientHandle() examine the client interface, there is
no way for it to easily see that the same client is being referred to.
I suppose the lightest weight fix might be for the service to return a
unique GUID when a client registers, and map them on its side. The
client, in turn, could provide that GUID each time it wants to
identify itself on subsequent function calls.
I hope this makes sense.
tone
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