hello
I want to know what settings should have for safe updates using stateless beans
(if it is possible), when have concurrency. I try to test using this code:
//this code is from Runnable objects (I have many objects of this type):
| for(int i=0;i<UPDATE_NO;i++){
| int amount = ran.nextInt(1000);
| amountSum +=amount;
|
testSessionC.adjust2Balance(balance.getId(),amount);
| }
|
//stateless bean:
| @Stateless
| @Remote(TestSessionC.class)
| @Local(TestSessionC.class)
| public class TestSessionCBean implements TestSessionC{
|
| @PersistenceContext(unitName = "...")
| EntityManager em;
|
| public void adjust2Balance(long id, int amount) {
| Balance b = em.find(Balance.class, id);
| em.lock(b, LockModeType.WRITE);
| float old = b.getAmount();
| b.setAmount(old+amount);
| em.merge(b);
| }
|
| }
|
my Balance entity use version control:
| @Version
| @Column(name = "OPTLOCK")
| public int getVersion() {
| return version;
| }
|
|
thanks for any ideea
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