java - Threading HttpUrlConnection -

i have 10 lists contains location data, each list has 10.000 entries. starting executerservice thread work.

executorservice executor = executors.newfixedthreadpool(locationlocationlist.size());  for(list<location> locationlist: locationlocationlist){     executor.execute(new testthread(locationlist)); } 

it takes soo long finish work, in 10 threads. expensive part seems 1 open url , connect it. idea how can tune this?

@override         public void run() {             while(isrunning){                 gson gson = new gson();              map<integer, data> map= new hashmap<integer, data>();              for(location location: locations){                 string data = getjson(location.getlatitude(), location.getlongitude());                 data data= gson.fromjson(data, data.class);                 map.put(location.getid(), data);              }               weatherdao.setweatherfast(map);             isrunning = false;         }                            }      private string getjson(double latitude, double longitude) {         httpurlconnection httpurlconnection = null;          try {             url u = new url("someurl"+latitude+""+longitude);             httpurlconnection = (httpurlconnection) u.openconnection();             httpurlconnection.setrequestmethod("get");             httpurlconnection.setrequestproperty("content-length", "0");             httpurlconnection.connect();             int status = httpurlconnection.getresponsecode();              switch (status) {                 case 200:                 case 201:                     bufferedreader br = new bufferedreader(new inputstreamreader(httpurlconnection.getinputstream()));                     stringbuilder sb = new stringbuilder();                     string line;                      while ((line = br.readline()) != null) {                         sb.append(line+"\n");                     }                     br.close();                     return sb.tostring();             }          } catch (exception ex) {            logger.error("couldnt data", ex);         }          return "";     } 

steps follow:

• store result of getjson() method based on latitude , longitude.

• for each call first check in stored map if found there no need call getjson() method again.

i hope if latitude , longitude repeating.

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sample code:

 map<string,string> cache = new concurrenthashmap<string,string>();   key (latitude + "_" + longitude) , value (data) 

keep in mind cache using in multi-threading.