public void removeCallback(QueryCallback callback) {
        if (callback.getQueryName() == null) {
            throw new SiddhiAppRuntimeException("Cannot find QueryName in the queryCallback");
        }
        String queryName = callback.getQueryName();
        QueryRuntime queryRuntime = queryProcessorMap.get(queryName);
        if (queryRuntime != null) {
            ((QueryRuntimeImpl) queryRuntime).removeCallback(callback);
        }
    }
Get the names of the available queries.

@return string set of query names.
modules/siddhi-core/src/main/java/io/siddhi/core/SiddhiAppRuntimeImpl.java