fw: FaceTable signals use Face& instead of shared_ptr

refs #3205

Change-Id: I53ecd0d6a13d379eb1dfb872041bdde8501f05e7
diff --git a/daemon/fw/access-strategy.cpp b/daemon/fw/access-strategy.cpp
index 90feaff..69c1a39 100644
--- a/daemon/fw/access-strategy.cpp
+++ b/daemon/fw/access-strategy.cpp
@@ -272,9 +272,9 @@
 }
 
 void
-AccessStrategy::removeFaceInfo(shared_ptr<Face> face)
+AccessStrategy::removeFaceInfo(const Face& face)
 {
-  m_fit.erase(face->getId());
+  m_fit.erase(face.getId());
 }
 
 } // namespace fw
diff --git a/daemon/fw/access-strategy.hpp b/daemon/fw/access-strategy.hpp
index ca7a2e3..02a7965 100644
--- a/daemon/fw/access-strategy.hpp
+++ b/daemon/fw/access-strategy.hpp
@@ -123,7 +123,7 @@
   typedef std::unordered_map<FaceId, FaceInfo> FaceInfoTable;
 
   void
-  removeFaceInfo(shared_ptr<Face> face);
+  removeFaceInfo(const Face& face);
 
 private: // forwarding procedures
   void
diff --git a/daemon/fw/face-table.cpp b/daemon/fw/face-table.cpp
index 2d40bbc..ef5b916 100644
--- a/daemon/fw/face-table.cpp
+++ b/daemon/fw/face-table.cpp
@@ -93,26 +93,29 @@
   face->afterReceiveInterest.connect(bind(&Forwarder::startProcessInterest, &m_forwarder, ref(*face), _1));
   face->afterReceiveData.connect(bind(&Forwarder::startProcessData, &m_forwarder, ref(*face), _1));
   face->afterReceiveNack.connect(bind(&Forwarder::startProcessNack, &m_forwarder, ref(*face), _1));
-  connectFaceClosedSignal(*face, bind(&FaceTable::remove, this, face));
+  connectFaceClosedSignal(*face, bind(&FaceTable::remove, this, faceId));
 
-  this->afterAdd(face);
+  this->afterAdd(*face);
 }
 
 void
-FaceTable::remove(shared_ptr<Face> face)
+FaceTable::remove(FaceId faceId)
 {
-  this->beforeRemove(face);
+  auto i = m_faces.find(faceId);
+  BOOST_ASSERT(i != m_faces.end());
+  shared_ptr<Face> face = i->second;
 
-  FaceId faceId = face->getId();
-  m_faces.erase(faceId);
+  this->beforeRemove(*face);
+
+  m_forwarder.getFib().removeNextHopFromAllEntries(*face);
+
+  m_faces.erase(i);
   face->setId(face::INVALID_FACEID);
 
   NFD_LOG_INFO("Removed face id=" << faceId <<
                " remote=" << face->getRemoteUri() <<
                " local=" << face->getLocalUri());
 
-  m_forwarder.getFib().removeNextHopFromAllEntries(*face);
-
   // defer Face deallocation, so that Transport isn't deallocated during afterStateChange signal
   getGlobalIoService().post([face] {});
 }
diff --git a/daemon/fw/face-table.hpp b/daemon/fw/face-table.hpp
index c8f93d0..7da4aff 100644
--- a/daemon/fw/face-table.hpp
+++ b/daemon/fw/face-table.hpp
@@ -53,7 +53,7 @@
   VIRTUAL_WITH_TESTS void
   add(shared_ptr<Face> face);
 
-  /** \brief add a special Face with a reserved FaceId
+  /** \brief add a special face with a reserved FaceId
    */
   VIRTUAL_WITH_TESTS void
   addReserved(shared_ptr<Face> face, FaceId faceId);
@@ -86,22 +86,22 @@
   end() const;
 
 public: // signals
-  /** \brief fires after a Face is added
+  /** \brief fires after a face is added
    */
-  signal::Signal<FaceTable, shared_ptr<Face>> afterAdd;
+  signal::Signal<FaceTable, Face&> afterAdd;
 
-  /** \brief fires before a Face is removed
+  /** \brief fires before a face is removed
    *
-   *  FaceId is valid when this event is fired
+   *  When this signal is emitted, face is still in FaceTable and has valid FaceId.
    */
-  signal::Signal<FaceTable, shared_ptr<Face>> beforeRemove;
+  signal::Signal<FaceTable, Face&> beforeRemove;
 
 private:
   void
   addImpl(shared_ptr<Face> face, FaceId faceId);
 
   void
-  remove(shared_ptr<Face> face);
+  remove(FaceId faceId);
 
   ForwardRange
   getForwardRange() const;
diff --git a/daemon/fw/strategy.hpp b/daemon/fw/strategy.hpp
index bc8c348..4f51f3b 100644
--- a/daemon/fw/strategy.hpp
+++ b/daemon/fw/strategy.hpp
@@ -178,8 +178,8 @@
   getFaceTable() const;
 
 protected: // accessors
-  signal::Signal<FaceTable, shared_ptr<Face>>& afterAddFace;
-  signal::Signal<FaceTable, shared_ptr<Face>>& beforeRemoveFace;
+  signal::Signal<FaceTable, Face&>& afterAddFace;
+  signal::Signal<FaceTable, Face&>& beforeRemoveFace;
 
 private:
   Name m_name;