apollo-openapi/src/main/java/com/ctrip/framework/apollo/openapi/dto/OpenNamespaceLockDTO.java/OpenNamespaceLockDTO/toString
class OpenNamespaceLockDTO:  @Override
  public String toString() {
    return "OpenNamespaceLockDTO{" +
        "namespaceName='" + namespaceName + '\'' +
        ", isLocked=" + isLocked +
        ", lockedBy='" + lockedBy + '\'' +
        '}';
  }