question: unsubscribes from current rx.subscription . concode_field_sep ThreadExecutor threadExecutor concode_elem_sep Subscription subscription concode_elem_sep PostExecutionThread postExecutionThread concode_field_sep Observable buildUseCaseObservable concode_elem_sep void execute
target: void function ( ) { if ( ! subscription . isUnsubscribed ( ) ) { subscription . unsubscribe ( ) ; } }