[JBoss JIRA] Created: (ISPN-1345) Dirty reads may occurs on mutable objects
by Christophe Labouisse (JIRA)
Dirty reads may occurs on mutable objects
-----------------------------------------
Key: ISPN-1345
URL: https://issues.jboss.org/browse/ISPN-1345
Project: Infinispan
Issue Type: Bug
Components: Transactions
Affects Versions: 5.0.0.FINAL
Environment: Windows Java 1.6.0_26
Reporter: Christophe Labouisse
Assignee: Manik Surtani
In local mode, I create a cache like this:
{code}
cacheManager = new DefaultCacheManager();
cacheManager.getDefaultConfiguration().fluent().storeAsBinary().transaction().cacheStopTimeout(5000);
final Configuration config = new Configuration().fluent().transactionManagerLookup(this.tmLookup).locking()
.isolationLevel(IsolationLevel.READ_COMMITED).build();
this.cacheManager.defineConfiguration("Gruik", config);
this.cache = this.cacheManager.getCache("Gruik");
{code}
When retrieving data using {{cache.get(_key_)}} I find out that Infinispan returns the object instance actually stored in the cache datastore. This is OK when the inserted objects are immutable but fails to achieve isolation when using mutable objects.
For instance on a simple Pojo with a {{get/setValue}}.
||Step||Reader||Writer||
|1|Starts transaction| |
|2|{{value = cache.get(KEY);}}| |
|3|{{System.out.println(value.getValue());}} Prints 42| |
|4| |Starts transaction|
|5| |{{value = cache.get(KEY);}} Same instance than step 2|
|6| |{{value.setValue(666); // Prepare update}}|
|7|{{System.out.println(value.getValue());}} Prints 666 !| |
|8|{{value = cache.get(KEY);}} Same instance than step 2| |
|9| |{{cache.put(KEY,value);}}|
|10| |Commits transaction|
|11|{{value = cache.get(KEY);}} Same instance than step 2| |
|12|{{System.out.println(value.getValue());}} Prints 666| |
|13|Commits transaction| |
According to the READ_COMMITTED specification, the value returned printed on step 7 should be 42, as the setting to 666 is not committed yes.
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