Caching reponse method results

Question

I have a interface for getting responses from an API server, the result is a future containing the response for a request string, my question is what is better and efficient way without repeating code to cache the results, currently in each implementation of the method I am doing map.get() from in memory cache if is cached, but it is repetitive since in each method I am writing the same. If it's useful, I'm using OkHttp, just in case it's possible to use some kind of interceptor or some other way, thanks..

interface SodyApi {
   ListenableFuture<FriendsListResponse> fetchFriendsList(String repo);
   ListenableFuture<GuildResponse> fetchGuild(String repo);
   ListenableFuture<UsersListResponse> fetchAllUsers(String repo);
}

class SodyApiImpl implements SodyApi {
   final Map<String, ListenableFuture<Response>> map = new HashMap();

   public ListenableFuture<FriendsList> fetchFriendsList(String repo) {
       if (map.containsKey(repo))
          return map.get(repo);
       // .... get response with okHttp
   }

   public ListenableFuture<GuildResponse> fetchGuild(String repo) {
       if (map.containsKey(repo))
          return map.get(repo);
       // .... get response with okHttp
   }

   public ListenableFuture<UsersListResponse> fetchAllUsers(String repo) {
       if (map.containsKey(repo))
          return map.get(repo);
       // .... get response with okHttp
   }
}