Session counter with HttpSessionListener and session count variable access

Question

I saw an example with session counter in Sun\'s \"Core Servlets and JavaServer Pages vol 2\".
Counter is simply build on HttpSessionListener and increments/decr

Answer 1

This would be safe.

public class HttpSessionListenerTest implements HttpSessionListener {
    final private AtomicInteger sessionCount = new AtomicInteger(0);

    @Override
    public void sessionCreated(HttpSessionEvent event) {
        sessionCount.incrementAndGet();
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent event) {
        sessionCount.decrementAndGet();
    }

    public int getTotalSessionCount() {
        return sessionCount.get();
    }
}