[jboss-user] [JBossCache] - JBossCache transaction isolation levels

[aricci]

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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