docs: improve Doxygen comments.

refs: #1435

Change-Id: I21624ef4eec393c82a50229a07e8277fb6ae4ddf
diff --git a/src/lsdb.hpp b/src/lsdb.hpp
index 9060ba0..6666558 100644
--- a/src/lsdb.hpp
+++ b/src/lsdb.hpp
@@ -47,19 +47,39 @@
   bool
   doesLsaExist(const ndn::Name& key, const std::string& lsType);
 
-  // functions related to Name LSDB
+
+  /*! \brief Builds a name LSA for this router and then installs it
+      into the LSDB.
+  */
   bool
   buildAndInstallOwnNameLsa();
 
+  /*! \brief Returns the name LSA with the given key.
+    \param key The name of the router that the desired LSA comes from.
+  */
   NameLsa*
   findNameLsa(const ndn::Name& key);
 
+  /*! \brief Installs a name LSA into the LSDB
+    \param nlsa The name LSA to install into the LSDB.
+  */
   bool
   installNameLsa(NameLsa& nlsa);
 
+  /*! \brief Remove a name LSA from the LSDB.
+    \param key The name of the router that published the LSA to remove.
+
+    This function will remove a name LSA from the LSDB by finding an
+    LSA whose name matches key. This removal also causes the NPT to
+    remove those name prefixes if no more LSAs advertise them.
+   */
   bool
   removeNameLsa(const ndn::Name& key);
 
+  /*! Returns whether a seq. no. from a certain router signals a new LSA.
+    \param key The name of the originating router.
+    \param seqNo The sequence number to check.
+  */
   bool
   isNameLsaNew(const ndn::Name& key, uint64_t seqNo);
 
@@ -69,19 +89,36 @@
   const std::list<NameLsa>&
   getNameLsdb();
 
-  // functions related to Cor LSDB
+  /*! \brief Builds a cor. LSA for this router and installs it into the LSDB. */
   bool
   buildAndInstallOwnCoordinateLsa();
 
+  /*! \brief Finds a cor. LSA in the LSDB.
+    \param key The name of the originating router that published the LSA.
+  */
   CoordinateLsa*
   findCoordinateLsa(const ndn::Name& key);
 
+  /*! \brief Installs a cor. LSA into the LSDB.
+    \param clsa The cor. LSA to install.
+  */
   bool
   installCoordinateLsa(CoordinateLsa& clsa);
 
+  /*! \brief Removes a cor. LSA from the LSDB.
+    \param key The name of the router that published the LSA to remove.
+
+    Removes the coordinate LSA whose origin router name matches that
+    given by key. Additionally, ask the NPT to remove the prefix,
+    which will occur if no other LSAs point there.
+  */
   bool
   removeCoordinateLsa(const ndn::Name& key);
 
+  /*! \brief Returns whether a cor. LSA from a router is new or not.
+    \param key The name prefix of the originating router.
+    \param seqNo The sequence number of the candidate LSA.
+  */
   bool
   isCoordinateLsaNew(const ndn::Name& key, uint64_t seqNo);
 
@@ -91,22 +128,41 @@
   const std::list<CoordinateLsa>&
   getCoordinateLsdb();
 
-  // functions related to Adj LSDB
+  //function related to Adj LSDB
+
+  /*! \brief Schedules a build of this router's LSA. */
   void
   scheduleAdjLsaBuild();
 
+  /*! \brief Wrapper event to build and install an adj. LSA for this router. */
   bool
   buildAndInstallOwnAdjLsa();
 
+  /*! \brief Removes an adj. LSA from the LSDB.
+    \param key The name of the publishing router whose LSA to remove.
+  */
   bool
   removeAdjLsa(const ndn::Name& key);
 
+  /*! \brief Returns whether an LSA is new.
+    \param key The name of the publishing router.
+    \param seqNo The seq. no. of the candidate LSA.
+
+    This function determines whether the LSA with the name key and
+    seq. no. seqNo would be new to this LSDB.
+  */
   bool
   isAdjLsaNew(const ndn::Name& key, uint64_t seqNo);
 
+  /*! \brief Installs an adj. LSA into the LSDB.
+    \param alsa The adj. LSA to add to the LSDB.
+  */
   bool
   installAdjLsa(AdjLsa& alsa);
 
+  /*! \brief Finds an adj. LSA in the LSDB.
+    \param key The name of the publishing router whose LSA to find.
+   */
   AdjLsa*
   findAdjLsa(const ndn::Name& key);
 
@@ -142,41 +198,80 @@
   processInterest(const ndn::Name& name, const ndn::Interest& interest);
 
 private:
+  /* \brief Add a name LSA to the LSDB if it isn't already there.
+     \param nlsa The candidade name LSA.
+  */
   bool
   addNameLsa(NameLsa& nlsa);
 
+  /*! \brief Returns whether the LSDB contains some LSA.
+    \param key The name of the publishing router whose LSA to check for.
+   */
   bool
   doesNameLsaExist(const ndn::Name& key);
 
-
+  /*! \brief Adds a cor. LSA to the LSDB if it isn't already there.
+    \param clsa The candidate cor. LSA.
+  */
   bool
   addCoordinateLsa(CoordinateLsa& clsa);
 
+  /*! \brief Returns whether a cor. LSA is in the LSDB.
+    \param key The name of the router that published the queried LSA.
+   */
   bool
   doesCoordinateLsaExist(const ndn::Name& key);
 
+  /*! \brief Attempts to construct an adj. LSA.
+
+    This function will attempt to construct an adjacency LSA. An LSA
+    can only be built when the status of all of the router's neighbors
+    is known. That is, when we are not currently trying to contact any
+    neighbor.
+   */
   void
   buildAdjLsa();
 
+  /*! \brief Adds an adj. LSA to the LSDB if it isn't already there.
+    \param alsa The candidate adj. LSA to add to the LSDB.
+  */
   bool
   addAdjLsa(AdjLsa& alsa);
 
+  /*! \brief Returns whether the LSDB contains an LSA.
+    \param key The name of a router whose LSA to check for in the LSDB.
+  */
   bool
   doesAdjLsaExist(const ndn::Name& key);
 
+  /*! \brief Schedules a refresh/expire event in the scheduler.
+    \param key The name of the router that published the LSA.
+    \param seqNo The seq. no. associated with the LSA.
+    \param expTime How many seconds to wait before triggering the event.
+   */
   ndn::EventId
   scheduleNameLsaExpiration(const ndn::Name& key, int seqNo,
                             const seconds& expTime);
 
+  /*! \brief Either allow to expire, or refresh a name LSA.
+    \param lsaKey The name of the router that published the LSA.
+    \param seqNo The seq. no. of the LSA to check.
+  */
   void
   exprireOrRefreshNameLsa(const ndn::Name& lsaKey, uint64_t seqNo);
 
 PUBLIC_WITH_TESTS_ELSE_PRIVATE:
+  /*! \brief Schedules an expire/refresh event in the LSA.
+    \param key The name of the router whose LSA is in question.
+    \param seqNo The sequence number of the LSA to check.
+    \param expTime The number of seconds to wait before triggering the event.
+  */
   ndn::EventId
   scheduleAdjLsaExpiration(const ndn::Name& key, int seqNo,
                            const seconds& expTime);
 
 private:
+
   void
   exprireOrRefreshAdjLsa(const ndn::Name& lsaKey, uint64_t seqNo);
 
@@ -188,6 +283,8 @@
   exprireOrRefreshCoordinateLsa(const ndn::Name& lsaKey,
                                 uint64_t seqNo);
 
+private:
+
   void
   putLsaData(const ndn::Interest& interest, const std::string& content);
 
@@ -205,7 +302,6 @@
   processInterestForCoordinateLsa(const ndn::Interest& interest,
                                   const ndn::Name& lsaKey,
                                   uint64_t seqNo);
-
   void
   onContentValidated(const ndn::shared_ptr<const ndn::Data>& data);
 
@@ -222,19 +318,19 @@
                               uint64_t lsSeqNo, std::string& dataContent);
 
 PUBLIC_WITH_TESTS_ELSE_PRIVATE:
-  /**
-   * @brief Error callback when SegmentFetcher fails to return an LSA
-   *
-   * In all error cases, a reattempt to fetch the LSA will be made.
-   *
-   * Segment validation can fail either because the packet does not have a
-   * valid signature (fatal) or because some of the certificates in the trust chain
-   * could not be fetched (non-fatal).
-   *
-   * Currently, the library does not provide clear indication (besides a plain-text message
-   * in the error callback) of the reason for the failure nor the segment that failed
-   * to be validated, thus we will continue to try to fetch the LSA until the deadline
-   * is reached.
+  /*!
+     \brief Error callback when SegmentFetcher fails to return an LSA
+
+     In all error cases, a reattempt to fetch the LSA will be made.
+
+     Segment validation can fail either because the packet does not have a
+     valid signature (fatal) or because some of the certificates in the trust chain
+     could not be fetched (non-fatal).
+
+     Currently, the library does not provide clear indication (besides a plain-text message
+     in the error callback) of the reason for the failure nor the segment that failed
+     to be validated, thus we will continue to try to fetch the LSA until the deadline
+     is reached.
    */
   void
   onFetchLsaError(uint32_t errorCode,
@@ -245,11 +341,11 @@
                   ndn::Name lsaName,
                   uint64_t seqNo);
 
-  /**
-   * @brief Success callback when SegmentFetcher returns a valid LSA
-   *
-   * \param The base Interest used to fetch the LSA in the format:
-   *        /<network>/NLSR/LSA/<site>/%C1.Router/<router>/<lsa-type>/<seqNo>
+  /*!
+     \brief Success callback when SegmentFetcher returns a valid LSA
+
+     \param The base Interest used to fetch the LSA in the format:
+            /<network>/NLSR/LSA/<site>/%C1.Router/<router>/<lsa-type>/<seqNo>
    */
   void
   afterFetchLsa(const ndn::ConstBufferPtr& data, ndn::Name& interestName);
@@ -258,6 +354,7 @@
   system_clock::TimePoint
   getLsaExpirationTimePoint();
 
+  /*! \brief Cancels an event in the event scheduler. */
   void
   cancelScheduleLsaExpiringEvent(ndn::EventId eid);