Java executor service How to return total success and total failed record at once - process

Question

I am inserting records in database using executorserive. Lets say saving 100 records by creating 5 batches each containing 20 records.
ExecutorService e = Executors.newFixedThreadPool(3);
Collection c= new ArrayList();
while (someloop)
{
c.add(mySaveMehtod());
}
List<Future<String>> list = e.invokeAll(c);
Iterator<Future<String>> i= list.iterator();
Future<String> f=null;
while(i.hasNext())
{
f= itr.next();
}
Strin str = f.get();
While processing there might be error for some records and some records will process successfully.
Once process finishes I want to collect total successfully processed and total failed record at once.
Can anybody let me know how I can achieve this ?
Thanks.

Answer 1

Assuming that you know if an INSERT of a record was successful immediately after executing the SQL, you can simply use two AtomicIntegers. You declare them and set to 0 before running batch insert jobs, and increment them in these jobs. Operations on AtomicIntegers are thread safe, so you don't need to worry about synchronization. For example:
public static void main() {
AtomicInteger nSuccess = new AtomicInteger(0);
AtomicInteger nFailed = new AtomicInteger(0);
// add batch insert jobs
// wait for jobs to finish
System.out.println("succeeded: " + nSuccess.get() + " failed: " + nFailed.get());
}
class BatchInserter implements Runnable {
public void run() {
for (int i = 0; i < 20; i++) {
if (insertRecord(i)) {
nSuccess.getAndIncrement();
} else {
nFailed.getAndIncrement();
}
}
}
}