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diff --git a/cpp/demo/book/lifecycle/FilesystemI.h b/cpp/demo/book/lifecycle/FilesystemI.h
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index 00000000000..ae3c42c7d79
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+++ b/cpp/demo/book/lifecycle/FilesystemI.h
@@ -0,0 +1,83 @@
+// **********************************************************************
+//
+// Copyright (c) 2003-2007 ZeroC, Inc. All rights reserved.
+//
+// This copy of Ice is licensed to you under the terms described in the
+// ICE_LICENSE file included in this distribution.
+//
+// **********************************************************************
+
+#ifndef __FilesystemI_h__
+#define __FilesystemI_h__
+
+#include <Ice/Ice.h>
+#include <IceUtil/Mutex.h>
+#include <Filesystem.h>
+#include <map>
+
+namespace FilesystemI
+{
+    class DirectoryI;
+    typedef IceUtil::Handle<DirectoryI> DirectoryIPtr;
+
+    class NodeI : virtual public Filesystem::Node
+    {
+    public:
+        virtual std::string name(const Ice::Current&);
+        Ice::Identity id() const;
+
+    protected:
+        NodeI(const ::std::string&, const DirectoryIPtr&);
+
+        const ::std::string _name;
+        const DirectoryIPtr _parent;
+        bool _destroyed;
+        Ice::Identity _id;
+        IceUtil::Mutex _m;
+    };
+
+    typedef IceUtil::Handle<NodeI> NodeIPtr;
+
+    class FileI : virtual public Filesystem::File, virtual public NodeI
+    {
+    public:
+        virtual Filesystem::Lines read(const Ice::Current&);
+        virtual void write(const Filesystem::Lines&, const Ice::Current&);
+        virtual void destroy(const Ice::Current&);
+
+        FileI(const Ice::ObjectAdapterPtr&, const std::string&, const DirectoryIPtr&);
+
+    private:
+        Filesystem::Lines _lines;
+    };
+
+    typedef IceUtil::Handle<FileI> FileIPtr;
+
+    class DirectoryI : virtual public NodeI, virtual public Filesystem::Directory
+    {
+    public:
+        virtual Filesystem::NodeDescSeq list(const Ice::Current&);
+        virtual Filesystem::NodeDesc find(const std::string& name, const Ice::Current&);
+        Filesystem::FilePrx createFile(const ::std::string&, const Ice::Current&);
+        Filesystem::DirectoryPrx createDirectory(const ::std::string&, const Ice::Current&);
+        virtual void destroy(const Ice::Current&);
+
+        DirectoryI(const Ice::ObjectAdapterPtr&, const std::string& = "/", const DirectoryIPtr& = 0);
+        void addChild(const ::std::string&, const NodeIPtr&);
+
+        void addReapEntry(const ::std::string&);
+
+        IceUtil::Mutex _lcMutex;
+
+    private:
+        typedef ::std::map< ::std::string, NodeIPtr> Contents;
+        Contents _contents;
+
+        typedef ::std::map<DirectoryIPtr, ::std::vector< ::std::string> > ReapMap;
+        static ReapMap _reapMap;
+
+        static void reap();
+    };
+}
+
+#endif