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Turned off pessimistic locking as now, for some reason I can't fathom, they

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don't seem to prevent deadlocks.  Also made HibernateTxn derive from 
HibernateTemplate, mostly to be able to sort out recoverable and non-recoverable
DB exceptions.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/WCM-DEV2/root@3279 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Britt Park
2006-07-04 17:05:12 +00:00
parent b05422171a
commit 30f1779a95
3 changed files with 39 additions and 45 deletions
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4
source/java/org/alfresco/repo/avm/DirectoryNodeImpl.java
View File

@@ -58,8 +58,8 @@ abstract class DirectoryNodeImpl extends AVMNodeImpl implements DirectoryNode
{
// TODO This may be very Dangerous!
Session sess = SuperRepository.GetInstance().getSession();
ChildEntry entry = (ChildEntry)sess.get(ChildEntryImpl.class, new ChildEntryImpl(name, this, null),
(write && getIsNew()) ? LockMode.UPGRADE : LockMode.READ);
ChildEntry entry = (ChildEntry)sess.get(ChildEntryImpl.class, new ChildEntryImpl(name, this, null));
// (write && getIsNew()) ? LockMode.UPGRADE : LockMode.READ);
return entry;
}

7
source/java/org/alfresco/repo/avm/SuperRepository.java
View File

@@ -440,7 +440,6 @@ class SuperRepository
for (String repName : repositories)
{
Repository repo = getRepositoryByName(repName, true);
fSession.get().lock(repo, LockMode.UPGRADE);
// fSession.get().lock(repo, LockMode.UPGRADE);
result.add(repo.createSnapshot());
}
@@ -455,7 +454,7 @@ class SuperRepository
public int createSnapshot(String repository)
{
Repository repo = getRepositoryByName(repository, true);
fSession.get().lock(repo, LockMode.UPGRADE);
// fSession.get().lock(repo, LockMode.UPGRADE);
// fSession.get().lock(repo, LockMode.UPGRADE);
return repo.createSnapshot();
}
@@ -716,8 +715,8 @@ class SuperRepository
private Repository getRepositoryByName(String name, boolean write)
{
Repository rep = (Repository)fSession.get().get(RepositoryImpl.class,
name, LockMode.READ /*,
write ? LockMode.UPGRADE : LockMode.READ*/);
name); /* LockMode.READ ,
write ? LockMode.UPGRADE : LockMode.READ); */
if (rep == null)
{
throw new AVMNotFoundException("Repository not found: " + name);

73
source/java/org/alfresco/repo/avm/hibernate/HibernateTxn.java
View File

@@ -22,6 +22,7 @@ import java.util.Random;
import org.alfresco.repo.avm.AVMException;
import org.alfresco.repo.avm.AVMNotFoundException;
import org.hibernate.HibernateException;
import org.hibernate.JDBCException;
import org.hibernate.ObjectNotFoundException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
@@ -29,12 +30,16 @@ import org.hibernate.StaleStateException;
import org.hibernate.Transaction;
import org.hibernate.exception.GenericJDBCException;
import org.hibernate.exception.LockAcquisitionException;
import org.springframework.dao.DataRetrievalFailureException;
import org.springframework.dao.DeadlockLoserDataAccessException;
import org.springframework.dao.OptimisticLockingFailureException;
import org.springframework.orm.hibernate3.HibernateTemplate;
/**
* Helper for DAOs.
* @author britt
*/
public class HibernateTxn
public class HibernateTxn extends HibernateTemplate
{
/**
* The SessionFactory.
@@ -61,6 +66,7 @@ public class HibernateTxn
*/
public void setSessionFactory(SessionFactory factory)
{
super.setSessionFactory(factory);
fSessionFactory = factory;
}
@@ -97,59 +103,48 @@ public class HibernateTxn
{
// Do nothing.
}
// If we've lost a race or we've deadlocked, retry.
if (t instanceof StaleStateException ||
t instanceof GenericJDBCException ||
t instanceof LockAcquisitionException)
// Translate the exception.
if (t instanceof JDBCException)
{
if (t instanceof StaleStateException)
t = convertJdbcAccessException((JDBCException)t);
}
else if (t instanceof HibernateException)
{
t = convertHibernateAccessException((HibernateException)t);
}
// If we've lost a race or we've deadlocked, retry.
if (t instanceof DeadlockLoserDataAccessException)
{
try
{
// System.err.println("Lost Race");
// StackTraceElement [] stack = t.getStackTrace();
// long threadID = Thread.currentThread().getId();
// for (StackTraceElement frame : stack)
// {
// System.err.println(threadID + " " + frame);
// }
long interval;
synchronized (fRandom)
{
interval = fRandom.nextInt(1000);
}
Thread.sleep(interval);
continue;
}
else
catch (InterruptedException ie)
{
// System.err.println("Deadlock");
// StackTraceElement [] stack = t.getStackTrace();
// long threadID = Thread.currentThread().getId();
// for (StackTraceElement frame : stack)
// {
// System.err.println(threadID + " " + frame);
// }
try
{
long interval;
synchronized (fRandom)
{
interval = fRandom.nextInt(1000);
}
Thread.sleep(interval);
continue;
}
catch (InterruptedException ie)
{
// Do nothing.
}
// Do nothing.
}
continue;
}
if (t instanceof OptimisticLockingFailureException)
{
continue;
}
}
if (t instanceof AVMException)
{
throw (AVMException)t;
}
// TODO Crack t into more useful exception types.
// Otherwise nothing we can do except throw.
if (t instanceof ObjectNotFoundException)
if (t instanceof DataRetrievalFailureException)
{
throw new AVMNotFoundException("Object not found.", t);
}
throw new AVMException("Unrecoverable error.");
throw new AVMException("Unrecoverable error.", t);
}
finally
{