1 files changed, 114 insertions, 0 deletions
diff --git a/qpid/java/bdbstore/src/main/java/org/apache/qpid/server/store/berkeleydb/upgrade/DatabaseTemplate.java b/qpid/java/bdbstore/src/main/java/org/apache/qpid/server/store/berkeleydb/upgrade/DatabaseTemplate.java
new file mode 100644
index 0000000000..135158afa4
--- /dev/null
+++ b/qpid/java/bdbstore/src/main/java/org/apache/qpid/server/store/berkeleydb/upgrade/DatabaseTemplate.java
@@ -0,0 +1,114 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ *
+ */
+package org.apache.qpid.server.store.berkeleydb.upgrade;
+
+import org.apache.log4j.Logger;
+
+import com.sleepycat.je.Database;
+import com.sleepycat.je.DatabaseConfig;
+import com.sleepycat.je.Environment;
+import com.sleepycat.je.Transaction;
+
+public class DatabaseTemplate
+{
+    private static final Logger _logger = Logger.getLogger(DatabaseTemplate.class);
+
+    private Environment _environment;
+    private String _sourceDatabaseName;
+    private String _targetDatabaseName;
+    private Transaction _parentTransaction;
+
+    public DatabaseTemplate(Environment environment, String sourceDatabaseName, Transaction transaction)
+    {
+        this(environment, sourceDatabaseName, null, transaction);
+    }
+
+    public DatabaseTemplate(Environment environment, String sourceDatabaseName, String targetDatabaseName,
+            Transaction parentTransaction)
+    {
+        _environment = environment;
+        _sourceDatabaseName = sourceDatabaseName;
+        _targetDatabaseName = targetDatabaseName;
+        _parentTransaction = parentTransaction;
+    }
+
+    public void run(DatabaseRunnable databaseRunnable)
+    {
+        DatabaseCallable<Void> callable = runnableToCallable(databaseRunnable);
+        call(callable);
+    }
+
+    public <T> T call(DatabaseCallable<T> databaseCallable)
+    {
+        Database sourceDatabase = null;
+        Database targetDatabase = null;
+        try
+        {
+            DatabaseConfig dbConfig = new DatabaseConfig();
+            dbConfig.setTransactional(true);
+            dbConfig.setAllowCreate(true);
+
+            sourceDatabase = _environment.openDatabase(_parentTransaction, _sourceDatabaseName, dbConfig);
+
+            if (_targetDatabaseName != null)
+            {
+                targetDatabase = _environment.openDatabase(_parentTransaction, _targetDatabaseName, dbConfig);
+            }
+
+            return databaseCallable.call(sourceDatabase, targetDatabase, _parentTransaction);
+        }
+        finally
+        {
+            closeDatabase(sourceDatabase);
+            closeDatabase(targetDatabase);
+        }
+    }
+
+    private DatabaseCallable<Void> runnableToCallable(final DatabaseRunnable databaseRunnable)
+    {
+        return new DatabaseCallable<Void>()
+        {
+
+            @Override
+            public Void call(Database sourceDatabase, Database targetDatabase, Transaction transaction)
+            {
+                databaseRunnable.run(sourceDatabase, targetDatabase, transaction);
+                return null;
+            }
+        };
+    }
+
+    private void closeDatabase(Database database)
+    {
+        if (database != null)
+        {
+            try
+            {
+                database.close();
+            }
+            catch (Exception e)
+            {
+                _logger.error("Unable to close database", e);
+            }
+        }
+    }
+
+}