Method checkAndSwitchTop

src/org/jgroups/stack/ProtocolStack.java:552–557

(Protocol oldTop, Protocol newTop)

    }

    private void checkAndSwitchTop(Protocol oldTop, Protocol newTop){
        if(oldTop == top_prot) {
            top_prot = newTop;
            top_prot.setUpProtocol(this);
        }
    }

    public void insertProtocol(Protocol prot, Position position, Class<? extends Protocol> neighbor_prot) throws Exception {
        if(neighbor_prot == null) throw new IllegalArgumentException("neighbor_prot is null");