code: @SuppressWarnings("unchecked")
  	@Override
  	public <K extends TServiceClient> K getClient(String serviceName, Class<K> clazz) {
  		T serviceClient = this.clients.get(serviceName);
  		if (serviceClient == null) {
  			throw new IllegalArgumentException("未知的服务名称：" + serviceName);
  		}
  
  		return (K) serviceClient;
  	}
docs: /*
  @see
  com.wmz7year.thrift.pool.connection.ThriftConnection#getClient(java.lang.
  String, java.lang.Class)