Asynchronous rpc handler support
--------------------------------
Key: SHINDIG-441
URL: https://issues.apache.org/jira/browse/SHINDIG-441
Project: Shindig
Issue Type: New Feature
Components: Features (Javascript)
Reporter: Zhen Wang
Currently an gadget rpc handler must be synchronous. Its return value is
immediately passed back to the rpc caller if a callback function is defined.
This prevents an rpc request handler to make some asynchronous calls and return
a value later.
Proposed solution:
Add a callback method to the rpc context object for an rpc request handler to
return a value asynchronously.
This won't affect existing code. Synchronous handlers may simply ignore the
change and return a value as usual while async handlers don't return a value
immediately and call "this.callback(return_value);" when ready.
Patch to rpc.js:
232,236d231
< if (rpc.c) {
< rpc.callback = function(result) {
< gadgets.rpc.call(rpc.f, CALLBACK_NAME, null, rpc.c, result);
< };
< }
242c237
< if (rpc.c && typeof result != 'undefined') {
---
> if (rpc.c) {
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