hi all,
i am testing JBossCache (version 1.4.1.SP3) Transaction Isolation levels. For
this reason i have developed a simple test application that creates 2 threads
that concurrently perform local transactions. All the examples have been done
with Postgres-8.2.1, and everytime i have changed JBossCache Transaction
Isolation level, i have changed the corresponding one in the database.
Thread 1: looks for a bean with primary key 1 and prints it, then sleeps for 2
seconds. when it wakes up, looks again for bean with primary key 1 and prints
it.
Thread 2: creates and persist a bean with primary key 1.
Everytime Thread 1 starts its execution before Thread 2.
| @TransactionAttribute(TransactionAttributeType.REQUIRED)
| public void doTransaction(int id) throws Exception {
| System.out.println(id + ": start transaction");
|
| // Thread 2
| if((id % 2) == 0) {
| em.persist(new Tx(1, 0, "adapt19"));
| System.out.println(id + ": inserted 1");
| }
| // Thread 1
| else {
| Tx tx = em.find(Tx.class, 1);
| System.out.println(id + ": " + tx);
| Thread.currentThread().sleep(2000);
| tx = em.find(Tx.class, 1);
| System.out.println(id + ": " + tx);
| }
|
| System.out.println(id + ": end transaction");
| } catch(Exception e) {e.printStackTrace();}
|
Serializable: ok
Repeatable read: no
| 1: start tx
| 2: start tx
| 1: null
| 2: inserted 1
| 2: end tx
| 1: 1, 0, adapt19 [should be null]
| 1: end tx
|
Read committed: ok
Read uncommitted: no (When trying to test this Isolation level i have inserted
a delay in Thread 2 to make it commit after Thraed 1)
| 1: start tx
| 1: null
| 2: start tx
| 2: inserted 1
| 1: null [shuold be 1, 0, adapt19]
| 1: end tx
| 2: end tx
|
Now my question is: is there something wrong with JBossCache Transaction
Isolation levels, or something wrong with my test application?
Thank you very much
Andrea
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