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diff --git a/src/Common/UserCache.h b/src/Common/UserCache.h
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+++ b/src/Common/UserCache.h
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+/*
+ * UserCache.h
+ *
+ * Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MAD_COMMON_USERCACHE_H_
+#define MAD_COMMON_USERCACHE_H_
+
+#include "UserBackend.h"
+
+#include <limits>
+
+#include <boost/thread/shared_mutex.hpp>
+
+namespace Mad {
+namespace Common {
+
+class UserManager;
+
+class UserCache : public UserBackend, private boost::noncopyable {
+  private:
+    friend class UserManager;
+
+    boost::shared_ptr<UserBackend> backend;
+
+    boost::shared_mutex mutex;
+
+    boost::shared_ptr<const std::map<unsigned long, UserInfo> > users;
+    boost::shared_ptr<std::map<std::string, unsigned long> > userNames;
+    Core::Exception userException;
+
+    boost::shared_ptr<const std::map<unsigned long, GroupInfo> > groups;
+    boost::shared_ptr<std::map<std::string, unsigned long> > groupNames;
+    Core::Exception groupException;
+
+    /*boost::shared_ptr<const std::multimap<unsigned long, unsigned long> > userGroups;
+    boost::shared_ptr<const std::multimap<unsigned long, unsigned long> > groupUsers;
+    Core::Exception userGroupException;*/
+
+  protected:
+    virtual boost::shared_ptr<const std::map<unsigned long, UserInfo> > getUserList() throw(Core::Exception);
+    virtual boost::shared_ptr<const UserInfo> getUserInfo(unsigned long uid) throw(Core::Exception);
+    virtual boost::shared_ptr<const UserInfo> getUserInfoByName(const std::string &name) throw(Core::Exception);
+    virtual boost::shared_ptr<const std::set<unsigned long> > getUserGroupList(unsigned long uid) throw(Core::Exception);
+
+    virtual boost::shared_ptr<const std::map<unsigned long, GroupInfo> > getGroupList() throw(Core::Exception);
+    virtual boost::shared_ptr<const GroupInfo> getGroupInfo(unsigned long gid) throw(Core::Exception);
+    virtual boost::shared_ptr<const GroupInfo> getGroupInfoByName(const std::string &name) throw(Core::Exception);
+    virtual boost::shared_ptr<const std::set<unsigned long> > getGroupUserList(unsigned long gid) throw(Core::Exception);
+
+    virtual void setPassword(unsigned long uid, const std::string &password) throw(Core::Exception) {
+      backend->setPassword(uid, password);
+    }
+
+    virtual void addUser(const UserInfo &userInfo) throw(Core::Exception) {
+      backend->addUser(userInfo);
+    }
+
+    UserCache(boost::shared_ptr<UserBackend> backend0) : backend(backend0) {}
+};
+
+}
+}
+
+#endif /* MAD_COMMON_USERCACHE_H_ */