@Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("transactionRole:");
        sb.append(transactionRole.name());
        sb.append(",");
        sb.append("address:");
        sb.append(address);
        sb.append(",");
        sb.append("msg:< ");
        sb.append(message.toString());
        sb.append(" >");
        return sb.toString();
    }
@Test
    public void testToString() {
        String expectStr = "transactionRole:RMROLE,address:127.0.0.1:8091,msg:< " + MSG1.toString() + " >";
        Assertions.assertEquals(nettyPoolKey.toString(), expectStr);
    }