package org.jboss.cache.transaction;
import EDU.oswego.cs.dl.util.concurrent.Latch;
import junit.framework.AssertionFailedError;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.jboss.cache.DummyTransactionManagerLookup;
import org.jboss.cache.Fqn;
import org.jboss.cache.TreeCache;
import org.jboss.cache.lock.IsolationLevel;
import org.jboss.cache.lock.TimeoutException;
import javax.transaction.NotSupportedException;
import javax.transaction.SystemException;
import javax.transaction.Transaction;
/**
* Tests READ_COMMITED isolation level.
*
* @author <a href="mailto:ovidiu@jboss.org">Ovidiu Feodorov</a>
* @version $Id: IsolationLevelRepeatableReadTest.java 3171 2006-12-14 14:29:15Z msurtani $
*/
public class IsolationLevelRepeatableReadTest extends TestCase
{
private TreeCache cache = null;
private final Fqn FQN = Fqn.fromString("/a");
private final String KEY = "key";
private final String VALUE = "value";
private volatile boolean writerFailed;
private volatile AssertionFailedError writerError;
protected void setUp() throws Exception
{
super.setUp();
writerFailed = false;
writerError = null;
cache = new TreeCache();
cache.setCacheMode(TreeCache.LOCAL);
cache.setIsolationLevel(IsolationLevel.REPEATABLE_READ);
cache.setTransactionManagerLookupClass(DummyTransactionManagerLookup.class.getName());
cache.setLockAcquisitionTimeout(1000);
cache.startService();
}
protected void tearDown() throws Exception
{
super.tearDown();
cache.stopService();
cache.destroyService();
cache = null;
}
/**
* Test creates a cache node then starts a separate thread that removes
* the node inside a tx. Test confirms that the removal cannot be seen
* before the test commits.
*
* @throws Exception
*/
public void testNodeRemoved() throws Exception
{
final Latch readerCanRead = new Latch();
final Latch readerDone = new Latch();
final Latch writerDone = new Latch();
cache.put(FQN, KEY, VALUE);
assertEquals(VALUE, cache.get(FQN, KEY));
// start a writer thread and a transaction
Thread writerThread = new Thread(new Runnable()
{
public void run()
{
try
{
Transaction tx = startTransaction();
// change VALUE in a transaction
cache.remove(FQN);
// notify the reading thread
readerCanRead.release();
readerDone.acquire();
tx.commit();
}
catch (AssertionFailedError e)
{
writerError = e;
}
catch (Throwable t)
{
t.printStackTrace();
writerFailed = true;
}
finally
{
System.out.println("writer thread exits");
readerCanRead.release();
writerDone.release();
}
}
}, "WRITER");
writerThread.start();
try
{
// wait until the writer thread changes the value in a transaction,
// but it did not yet commit or roll back.
readerCanRead.acquire();
// I shouldn't be able to see the "dirty" value
assertEquals("2nd thread cannot see uncommitted changes",
VALUE, cache.get(FQN, KEY));
}
catch (TimeoutException t)
{
// ignore, this is good
}
finally
{
System.out.println("reader thread exits");
readerDone.release();
}
// wait for the writer to finish
writerDone.acquire();
assertNull("Node was removed", cache.get(FQN));
// If any assertion failed, throw on the AssertionFailedError
if (writerError != null)
{
throw writerError;
}
if (writerFailed)
{
fail("The writer thread exited incorrectly. Watch the log for previous stack traces");
}
}
private Transaction startTransaction() throws SystemException, NotSupportedException
{
DummyTransactionManager mgr = DummyTransactionManager.getInstance();
mgr.begin();
return mgr.getTransaction();
}
public static Test suite()
{
return new TestSuite(IsolationLevelRepeatableReadTest.class);
}
}