--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/servlib/storage/PersistentStore.h	Thu Apr 21 14:57:45 2011 +0100
@@ -0,0 +1,78 @@
+/*
+ *    Copyright 2004-2006 Intel Corporation
+ * 
+ *    Licensed 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.
+ */
+
+#ifndef _PERSISTENT_STORE_H_
+#define _PERSISTENT_STORE_H_
+
+
+#include <vector>
+#include <oasys/serialize/Serialize.h>
+
+namespace dtn {
+
+/**
+ * The abstract base class implementing a persistent storage system.
+ * Specific implementations (i.e. Berkeley DB or SQL) should derive
+ * from this class.
+ *
+ * TODO:
+ *   * should the key be an int or a std::string?
+ */
+class PersistentStore {
+public:
+    /**
+     * Close and flush the store.
+     */
+    virtual int close() = 0;
+    
+    /**
+     * Fill in the fields of the object referred to by *obj with the
+     * value stored at the given key.
+     */
+    virtual int get(oasys::SerializableObject* obj, const int key) = 0;
+    
+    /**
+     * Store the object with the given key.
+     */
+    virtual int add(oasys::SerializableObject* obj, const int key) = 0;
+
+    /**
+     * Update the object with the given key.
+     */
+    virtual int update(oasys::SerializableObject* obj, const int key) = 0;
+
+    /**
+     * Delete the object at the given key.
+     */
+    virtual int del(const int key) = 0;
+
+    /**
+     * Return the number of elements in the table.
+     */
+    virtual int num_elements() = 0;
+    
+    /**
+     * Fill in the given vector with the keys currently stored in the
+     * table.
+     */
+    virtual void keys(std::vector<int> * v) = 0;
+
+    virtual ~PersistentStore();
+
+};
+} // namespace dtn
+
+#endif /* _PERSISTENT_STORE_H_ */