Add memory backend for node store

modules/ripple_app/node/ripple_MemoryBackendFactory.cpp

@@ -0,0 +1,113 @@
+//------------------------------------------------------------------------------
+/*
+    Copyright (c) 2011-2013, OpenCoin, Inc.
+*/
+//==============================================================================
+
+class MemoryBackendFactory::Backend : public NodeStore::Backend
+{
+private:
+    typedef std::map <uint256 const, NodeObject::Ptr> Map;
+
+public:
+    Backend (size_t keyBytes, StringPairArray const& keyValues)
+        : m_keyBytes (keyBytes)
+    {
+    }
+
+    ~Backend ()
+    {
+    }
+
+    std::string getName ()
+    {
+        return "memory";
+    }
+
+    //--------------------------------------------------------------------------
+
+    Status fetch (void const* key, NodeObject::Ptr* pObject)
+    {
+        uint256 const hash (key);
+
+        Map::iterator iter = m_map.find (hash);
+
+        if (iter != m_map.end ())
+        {
+            *pObject = iter->second;
+        }
+        else
+        {
+            pObject->reset ();
+        }
+
+        return ok;
+    }
+
+    void store (NodeObject::ref object)
+    {
+        Map::iterator iter = m_map.find (object->getHash ());
+
+        if (iter == m_map.end ())
+        {
+            m_map.insert (std::make_pair (object->getHash (), object));
+        }
+    }
+
+    void storeBatch (NodeStore::Batch const& batch)
+    {
+        for (int i = 0; i < batch.size (); ++i)
+            store (batch [i]);
+    }
+
+    void visitAll (VisitCallback& callback)
+    {
+        for (Map::const_iterator iter = m_map.begin (); iter != m_map.end (); ++iter)
+            callback.visitObject (iter->second);
+    }
+
+    int getWriteLoad ()
+    {
+        return 0;
+    }
+
+    //--------------------------------------------------------------------------
+
+private:
+    size_t const m_keyBytes;
+
+    Map m_map;
+};
+
+//------------------------------------------------------------------------------
+
+MemoryBackendFactory::MemoryBackendFactory ()
+{
+}
+
+MemoryBackendFactory::~MemoryBackendFactory ()
+{
+}
+
+MemoryBackendFactory& MemoryBackendFactory::getInstance ()
+{
+    static MemoryBackendFactory instance;
+
+    return instance;
+}
+
+String MemoryBackendFactory::getName () const
+{
+    return "Memory";
+}
+
+NodeStore::Backend* MemoryBackendFactory::createInstance (
+    size_t keyBytes,
+    StringPairArray const& keyValues,
+    NodeStore::Scheduler& scheduler)
+{
+    return new MemoryBackendFactory::Backend (keyBytes, keyValues);
+}
+
+//------------------------------------------------------------------------------
+