public void removeCallback(StreamCallback streamCallback) {
        if (streamCallback.getStreamId() == null) {
            throw new SiddhiAppRuntimeException("Cannot find streamID in the streamCallback");
        }
        String streamId = streamCallback.getStreamId();
        StreamJunction streamJunction = streamJunctionMap.get(streamId);
        if (streamJunction != null) {
            streamJunction.unsubscribe(streamCallback);
        }
    }
Get the names of the available queries.

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