java - A little confused about access count -

now responsibility in project access count module. if user login in 2 hours repeatly ,it should treat once.

i use concurrenthashmap put user id , access time.

private static map<string,date> logintimemap = new concurrenthashmap<string, date>(); 

every time user access index page , program compare time.

date date = logintimemap.get(user.getsuuserid()); if(date==null||dateutil.gethourinterval(new date(),date)>=definedvalue.limit_time){     accesscount=accesscount+1;     logintimemap.put(user.getsuuserid(), new date()); } 

in code limit_time constant refers 2 hours.

will logintimemap slow server if size of map exceed 10000?

really sorry poor english!

will logintimemap slow server if size of map exceed 10000?

a hashmap has time complexity of o(1). is, hashes, goes straight value. not search value. means it's performance not proportional amount of elements in array, although 10,000 entries might memory heavy!