if(log.isDebugEnabled()) log.debug(local_addr + " became participant");
    public void becomeParticipant() {        ParticipantGmsImpl tmp=(ParticipantGmsImpl)impls.get(PART);        if(tmp == null) {            tmp=new ParticipantGmsImpl(this);            impls.put(PART, tmp);        }        tmp.leaving=false;        setImpl(tmp);         if(log.isDebugEnabled()) log.debug(local_addr + " became participant");    }