def Search(self, metadata):
ticket = self._search_count
self._search_count = self._search_count + 1
thread = BaseTaskThread(onfinish=lambda result: self.do_searchsuccess(self._app, ticket, result),
onerror=lambda e: self.do_searchfailure(self._app, ticket, e),
target=self.do_search,
kwargs={'metadata': Metadata.from_dict(metadata)})
self._search_tasks[ticket] = thread
thread.start()
return ticket
