i hav a home controller within which i hav 2 methods one is
@RequestMapping(value = "/mypage.te", method = RequestMethod.GET)
public String mypage1(Locale locale, Model model){
Authentication auth = SecurityContextHolder.getContext().getAuthentication();
String name = auth.getName(); //get logged in username
model.addAttribute("username", name);
model.addAttribute("customGroup",grpDao.fetchCustomGroup());
model.addAttribute("serverTime", formattedDate);
model.addAttribute("username", name);
return "mypage";
}
here in this method actually i call grpDao.fetchCustomGroup()
method from a Dao class which performs a native query and fetches data and returns and it is saved in customGroup
.
now the same fetchcustomGroup()
method is to be used in another method ie
@RequestMapping(value = "/manageGrps.te", method = RequestMethod.GET)
public String man_grp_connections(@RequestParam("id") Integer groupId,@RequestParam("name") String groupName, Model model) {
Authentication auth = SecurityContextHolder.getContext().getAuthentication();
String name = auth.getName();
System.out.println("I am in the fetchCustomGroup controller");
int profileid=grpDao.getProfileId(name);
//model.addAttribute("customGroup",grpDao.fetchCustomGroup());
model.addAttribute("memberList",grpDao.fetchGroupMembers(groupId,profileid));
model.addAttribute("groupid",groupId);
model.addAttribute("profileid",profileid);
model.addAttribute("groupName",groupName);
System.out.println("groupid="+groupId);
System.out.println("groupName="+groupName);
return "manageGrps";
}
so instead of calling the fetchCustomGroup()
in both the methods i just want to call in only one method and use the result in both the methods in the home controller.
so how can i use customGroup in another method to use the result of the fetchCustomGroup()
I think that what you want is to avoid executing the query twice. This can be done in different ways. The easiest way would be to assign the response to a variable in your controller and then use a getter instead of the dao. Controllers are singleton by default. Something like :
private Foo customGroup;
private synchronized Foo getCustomGroup() {
if(customGroup == null) {
customGroup = grpDao.fetchCustomGroup();
}
return customGroup;
}
And then use getCustomGroup()
instead of grpDao.fetchCustomGroup()
I don't know what you are using for your persistence but using cache would also be a good idea to avoid executing the query twice.
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