diff --git a/src/lsdb.hpp b/src/lsdb.hpp
new file mode 100644
index 0000000..96f0ff1
--- /dev/null
+++ b/src/lsdb.hpp
@@ -0,0 +1,145 @@
+#ifndef NLSR_LSDB_HPP
+#define NLSR_LSDB_HPP
+
+#include <utility>
+#include "lsa.hpp"
+
+namespace nlsr {
+class Nlsr;
+
+class Lsdb
+{
+public:
+  Lsdb()
+    : m_lsaRefreshTime(0)
+  {
+  }
+
+
+  bool
+  doesLsaExist(std::string key, int lsType);
+  // function related to Name LSDB
+
+  bool
+  buildAndInstallOwnNameLsa(Nlsr& pnlsr);
+
+  std::pair<NameLsa&, bool>
+  getNameLsa(std::string key);
+
+  bool
+  installNameLsa(Nlsr& pnlsr, NameLsa& nlsa);
+
+  bool
+  removeNameLsa(Nlsr& pnlsr, std::string& key);
+
+  bool
+  isNameLsaNew(std::string key, uint64_t seqNo);
+
+  void
+  printNameLsdb(); //debugging
+
+  //function related to Cor LSDB
+  bool
+  buildAndInstallOwnCorLsa(Nlsr& pnlsr);
+
+  std::pair<CorLsa&, bool>
+  getCorLsa(std::string key);
+
+  bool
+  installCorLsa(Nlsr& pnlsr, CorLsa& clsa);
+
+  bool
+  removeCorLsa(Nlsr& pnlsr, std::string& key);
+
+  bool
+  isCorLsaNew(std::string key, uint64_t seqNo);
+
+  void
+  printCorLsdb(); //debugging
+
+  //function related to Adj LSDB
+  void
+  scheduledAdjLsaBuild(Nlsr& pnlsr);
+
+  bool
+  buildAndInstallOwnAdjLsa(Nlsr& pnlsr);
+
+  bool
+  removeAdjLsa(Nlsr& pnlsr, std::string& key);
+
+  bool
+  isAdjLsaNew(std::string key, uint64_t seqNo);
+  bool
+  installAdjLsa(Nlsr& pnlsr, AdjLsa& alsa);
+
+  std::pair<AdjLsa&, bool>
+  getAdjLsa(std::string key);
+
+  std::list<AdjLsa>&
+  getAdjLsdb();
+
+  void
+  printAdjLsdb();
+
+  //void scheduleRefreshLsdb(Nlsr& pnlsr, int interval);
+  void
+  setLsaRefreshTime(int lrt);
+
+  void
+  setThisRouterPrefix(std::string trp);
+
+private:
+  bool
+  addNameLsa(NameLsa& nlsa);
+
+  bool
+  doesNameLsaExist(std::string key);
+
+
+  bool
+  addCorLsa(CorLsa& clsa);
+
+  bool
+  doesCorLsaExist(std::string key);
+
+  bool
+  addAdjLsa(AdjLsa& alsa);
+
+  bool
+  doesAdjLsaExist(std::string key);
+
+  ndn::EventId
+  scheduleNameLsaExpiration(Nlsr& pnlsr, std::string key, int seqNo, int expTime);
+
+  void
+  exprireOrRefreshNameLsa(Nlsr& pnlsr, std::string lsaKey, uint64_t seqNo);
+
+  ndn::EventId
+  scheduleAdjLsaExpiration(Nlsr& pnlsr, std::string key, int seqNo, int expTime);
+
+  void
+  exprireOrRefreshAdjLsa(Nlsr& pnlsr, std::string lsaKey, uint64_t seqNo);
+
+  ndn::EventId
+  scheduleCorLsaExpiration(Nlsr& pnlsr, std::string key, int seqNo, int expTime);
+
+  void
+  exprireOrRefreshCorLsa(Nlsr& pnlsr, std::string lsaKey, uint64_t seqNo);
+
+
+private:
+  void
+  cancelScheduleLsaExpiringEvent(Nlsr& pnlsr, ndn::EventId eid);
+
+  std::list<NameLsa> m_nameLsdb;
+  std::list<AdjLsa> m_adjLsdb;
+  std::list<CorLsa> m_corLsdb;
+
+  int m_lsaRefreshTime;
+  std::string m_thisRouterPrefix;
+
+};
+
+}//namespace nlsr
+
+#endif //NLSR_LSDB_HPP