synchronized @Service
I want to build a caching singleton service with the jboss @Service annotation. In this singleton service the methods have to be synchronized. In my tests I saw, that the singleton instance of my service allows multiple active simultaneous threads (see bellow: Not synchronized output). When I mark the service methods with "synchronized", the service acts in the way I need it (see bellow: synchronized output).
Her my questions:
1. Is it allowed to use the synchronized keyword (EJB spec) in my @Service singleton methods?
2. Are there any special jboss annotations for @Service singeltons, which I can use to mark service methods "SYNCHRONIZED"?
thanks a lot,
Florian
public interface JBossServiceTest
{
public void test();
}@Remote(JBossServiceTest.class)
@Service
public class JBossServiceTestBean implements JBossServiceTest
{
private static final Logger logger = Logger.getLogger(JBossServiceTestBean.class);
private static int callCounter = 1;
public JBossServiceTestBean()
{
}
public void test()
{
int callId = callCounter++;
logger.info("start test call " + callId);
try
{
Thread.sleep(3000);
}
catch (Exception e)
{
logger.fatal("error :(", e);
}
logger.info("end test call " + callId);
}
}Not synchronized output:
10:01:19,751 INFO [JBossServiceTestBean] start test call 1 10:01:19,751 INFO [JBossServiceTestBean] start test call 8 10:01:19,751 INFO [JBossServiceTestBean] start test call 9 10:01:19,751 INFO [JBossServiceTestBean] start test call 6 10:01:19,751 INFO [JBossServiceTestBean] start test call 7 10:01:19,751 INFO [JBossServiceTestBean] start test call 3 10:01:19,751 INFO [JBossServiceTestBean] start test call 2 10:01:19,751 INFO [JBossServiceTestBean] start test call 5 10:01:19,751 INFO [JBossServiceTestBean] start test call 1 10:01:19,751 INFO [JBossServiceTestBean] start test call 4 10:01:22,752 INFO [JBossServiceTestBean] end test call 1 10:01:22,752 INFO [JBossServiceTestBean] end test call 9 10:01:22,752 INFO [JBossServiceTestBean] end test call 7 10:01:22,752 INFO [JBossServiceTestBean] end test call 4 10:01:22,752 INFO [JBossServiceTestBean] end test call 1 10:01:22,752 INFO [JBossServiceTestBean] end test call 5 10:01:22,752 INFO [JBossServiceTestBean] end test call 2 10:01:22,752 INFO [JBossServiceTestBean] end test call 3 10:01:22,752 INFO [JBossServiceTestBean] end test call 6 10:01:22,752 INFO [JBossServiceTestBean] end test call 8
@Remote(JBossServiceTest.class)
@Service
public class JBossServiceTestBean implements JBossServiceTest
{
private static final Logger logger = Logger.getLogger(JBossServiceTestBean.class);
private static int callCounter = 1;
public JBossServiceTestBean()
{
}
public synchronized void test()
{
int callId = callCounter++;
logger.info("start test call " + callId);
try
{
Thread.sleep(3000);
}
catch (Exception e)
{
logger.fatal("error :(", e);
}
logger.info("end test call " + callId);
}
}synchronized output:
10:03:29,539 INFO [JBossServiceTestBean] start test call 1 10:03:32,539 INFO [JBossServiceTestBean] end test call 1 10:03:32,539 INFO [JBossServiceTestBean] start test call 2 10:03:35,540 INFO [JBossServiceTestBean] end test call 2 10:03:35,540 INFO [JBossServiceTestBean] start test call 3 10:03:38,540 INFO [JBossServiceTestBean] end test call 3 10:03:38,540 INFO [JBossServiceTestBean] start test call 4 10:03:41,540 INFO [JBossServiceTestBean] end test call 4 10:03:41,540 INFO [JBossServiceTestBean] start test call 5 10:03:44,540 INFO [JBossServiceTestBean] end test call 5 10:03:44,540 INFO [JBossServiceTestBean] start test call 6 10:03:47,540 INFO [JBossServiceTestBean] end test call 6 10:03:47,540 INFO [JBossServiceTestBean] start test call 7 10:03:50,540 INFO [JBossServiceTestBean] end test call 7 10:03:50,540 INFO [JBossServiceTestBean] start test call 8 10:03:53,541 INFO [JBossServiceTestBean] end test call 8 10:03:53,541 INFO [JBossServiceTestBean] start test call 9 10:03:56,541 INFO [JBossServiceTestBean] end test call 9 10:03:56,541 INFO [JBossServiceTestBean] start test call 10 10:03:59,541 INFO [JBossServiceTestBean] end test call 10
