Add memory backend for node store

modules/ripple_app/node/ripple_MemoryBackendFactory.h

@@ -0,0 +1,32 @@
+//------------------------------------------------------------------------------
+/*
+    Copyright (c) 2011-2013, OpenCoin, Inc.
+*/
+//==============================================================================
+
+#ifndef RIPPLE_MEMORYBACKENDFACTORY_H_INCLUDED
+#define RIPPLE_MEMORYBACKENDFACTORY_H_INCLUDED
+
+/** Factory to produce a RAM based backend for the NodeStore.
+
+    @see NodeStore
+*/
+class MemoryBackendFactory : public NodeStore::BackendFactory
+{
+private:
+    class Backend;
+
+    MemoryBackendFactory ();
+    ~MemoryBackendFactory ();
+
+public:
+    static MemoryBackendFactory& getInstance ();
+
+    String getName () const;
+
+    NodeStore::Backend* createInstance (size_t keyBytes,
+                                        StringPairArray const& keyValues,
+                                        NodeStore::Scheduler& scheduler);
+};
+
+#endif