A rename and a minor code rearrangement.

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/WCM-DEV2/root@3333 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/avm/hibernate/HibernateRetryingTransaction.java

@@ -0,0 +1,165 @@
+package org.alfresco.repo.avm.hibernate;
+
+/*
+ * Copyright (C) 2006 Alfresco, Inc.
+ *
+ * Licensed under the Mozilla Public License version 1.1 
+ * with a permitted attribution clause. You may obtain a
+ * copy of the License at
+ *
+ *   http://www.alfresco.org/legal/license.txt
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific
+ * language governing permissions and limitations under the
+ * License.
+ */
+
+import java.util.Random;
+
+import org.alfresco.repo.avm.AVMException;
+import org.alfresco.repo.avm.AVMNotFoundException;
+import org.alfresco.repo.avm.RetryingTransactionCallback;
+import org.alfresco.repo.avm.RetryingTransaction;
+import org.apache.log4j.Logger;
+import org.springframework.dao.DataRetrievalFailureException;
+import org.springframework.dao.DeadlockLoserDataAccessException;
+import org.springframework.dao.OptimisticLockingFailureException;
+import org.springframework.orm.hibernate3.HibernateTemplate;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.TransactionDefinition;
+import org.springframework.transaction.TransactionException;
+import org.springframework.transaction.TransactionStatus;
+
+/**
+ * Helper for DAOs.
+ * @author britt
+ */
+public class HibernateRetryingTransaction extends HibernateTemplate implements RetryingTransaction
+{
+    private static Logger fgLogger = Logger.getLogger(HibernateRetryingTransaction.class);
+    /**
+     * The transaction manager.
+     */
+    private PlatformTransactionManager fTransactionManager;
+    
+    /**
+     * The read transaction definition.
+     */
+    private TransactionDefinition fReadDefinition;
+    
+    /**
+     * The write transaction definition.
+     */
+    private TransactionDefinition fWriteDefinition;
+    
+    /**
+     * The random number generator for inter-retry sleep.
+     */
+    private Random fRandom;
+    
+    /**
+     * Make one up.
+     * @param sessionFactory The SessionFactory.
+     */
+    public HibernateRetryingTransaction()
+    {
+        fRandom = new Random();
+    }
+
+    /* (non-Javadoc)
+     * @see org.alfresco.repo.avm.hibernate.RetryingTransaction#perform(org.alfresco.repo.avm.hibernate.HibernateTxnCallback, boolean)
+     */
+    public void perform(RetryingTransactionCallback callback, boolean write)
+    {
+        while (true)
+        {
+            TransactionStatus status = null;
+            try
+            {
+                status = 
+                    fTransactionManager.getTransaction(write ? fWriteDefinition : fReadDefinition);
+                execute(new HibernateCallbackWrapper(callback));
+            }
+            catch (Throwable t)
+            {
+                if (!status.isCompleted())
+                {
+                    fTransactionManager.rollback(status);
+                }
+                // If we've lost a race or we've deadlocked, retry.
+                if (t instanceof DeadlockLoserDataAccessException)
+                {
+                    fgLogger.info("Deadlock");
+                    try
+                    {
+                        long interval;
+                        synchronized (fRandom)
+                        {
+                            interval = fRandom.nextInt(1000);
+                        }
+                        Thread.sleep(interval);
+                    }
+                    catch (InterruptedException ie)
+                    {
+                        // Do nothing.
+                    }
+                    continue;
+                }
+                if (t instanceof OptimisticLockingFailureException)
+                {
+                    fgLogger.info("Lost Race");
+                    continue;
+                }
+                if (t instanceof AVMException)
+                {
+                    throw (AVMException)t;
+                }
+                if (t instanceof DataRetrievalFailureException)
+                {
+                    System.err.println("Data Retrieval Error.");
+                    throw new AVMNotFoundException("Object not found.", t);
+                }
+                throw new AVMException("Unrecoverable error.", t);
+            }
+            try
+            {
+                fTransactionManager.commit(status);
+            }
+            catch (TransactionException te)
+            {
+                throw new AVMException("Transaction Exception.", te);
+            }
+            return;
+        }
+    }
+    
+    /**
+     * Set the transaction manager we are operating under.
+     * @param manager
+     */
+    public void setTransactionManager(PlatformTransactionManager manager)
+    {
+        fTransactionManager = manager;
+    }
+    
+    /**
+     * Set the read Transaction Definition.
+     * @param def
+     */
+    public void setReadTransactionDefinition(TransactionDefinition def)
+    {
+        fReadDefinition = def;
+    }
+    
+    /**
+     * Set the write Transaction Definition.
+     * @param def
+     */
+    public void setWriteTransactionDefinition(TransactionDefinition def)
+    {
+        fWriteDefinition = def;
+    }
+}