} else if (configCopy.getSingleServerConfig() != null) {
connectionManager = new SingleConnectionManager(configCopy.getSingleServerConfig(), configCopy);
} else if (configCopy.getSentinelServersConfig() != null) {
connectionManager = new SentinelConnectionManager(configCopy.getSentinelServersConfig(), configCopy);
} else if (configCopy.getClusterServersConfig() != null) {
connectionManager = new ClusterConnectionManager(configCopy.getClusterServersConfig(), configCopy);
} else {
throw new IllegalArgumentException("server(s) address(es) not defined!");
}
}