blob: 45f05c355bcec4683b0164992f6068edda39c240 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
package examples.entity.intro;
import javax.ejb.Interceptors;
import javax.ejb.Remote;
import javax.ejb.Stateful;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.persistence.EntityListener;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
/**
* Stateful session bean facade for account entities, remotely accessible
*/
@Stateful
@Remote(AccountInterface.class)
public class AccountBean implements AccountInterface {
/** The entity manager, injected by the container */
@PersistenceContext(type=PersistenceContextType.EXTENDED)
private EntityManager manager;
private Account account;
@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
public void open(int accountNumber) {
account = manager.find(Account.class, accountNumber);
if(account == null)
account = new Account();
account.ownerName = "anonymous";
account.accountNumber = accountNumber;
manager.persist(account);
}
@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
public int getBalance() {
if(account==null)
throw new IllegalStateException();
return account.balance;
}
@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
public void deposit(int amount) {
if(account==null)
throw new IllegalStateException();
//manager = emf.createEntityManager(PersistenceContextType.EXTENDED);
//account = manager.merge(account);
account.balance += amount;
//manager.flush();
}
@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
public int withdraw(int amount) {
if(account==null)
throw new IllegalStateException();
// manager.lock(account, LockMode.WRITE);
if (amount > account.balance) {
return 0;
} else {
account.balance -= amount;
return amount;
}
}
}
|
