2010-08-26 Tatsuhiro Tsujikawa <t-tujikawa@users.sourceforge.net>

Enter end game mode as soon as all pieces are assigned to peer to
	avoid substantial slow down at the very last stage of download.
	* src/DefaultBtInteractive.cc
	* src/DefaultPieceStorage.cc
	* src/DefaultPieceStorage.h
	* src/PieceStorage.h
	* src/UnknownLengthPieceStorage.h
	* test/MockPieceStorage.h

ChangeLog

@@ -1,3 +1,14 @@
+2010-08-26  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Enter end game mode as soon as all pieces are assigned to peer to
+	avoid substantial slow down at the very last stage of download.
+	* src/DefaultBtInteractive.cc
+	* src/DefaultPieceStorage.cc
+	* src/DefaultPieceStorage.h
+	* src/PieceStorage.h
+	* src/UnknownLengthPieceStorage.h
+	* test/MockPieceStorage.h
+
 2010-08-25  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Updated IPv6 DHT usage.

src/DefaultBtInteractive.cc

@@ -323,7 +323,8 @@ size_t DefaultBtInteractive::receiveMessages() {
       break;
     }
   }
-  if(countOldOutstandingRequest >= maxOutstandingRequest_ &&
+  if(!pieceStorage_->isEndGame() &&
+     countOldOutstandingRequest >= maxOutstandingRequest_ &&
      dispatcher_->countOutstandingRequest() == 0){
     maxOutstandingRequest_ =
       std::min((size_t)UB_MAX_OUTSTANDING_REQUEST,
@@ -394,6 +395,12 @@ void DefaultBtInteractive::fillPiece(size_t maxMissingBlock) {
 }
 
 void DefaultBtInteractive::addRequests() {
+  if(!pieceStorage_->isEndGame() && !pieceStorage_->hasMissingUnusedPiece()) {
+    pieceStorage_->enterEndGame();
+  }
+  if(pieceStorage_->isEndGame()) {
+    maxOutstandingRequest_ = 2;
+  }
   fillPiece(maxOutstandingRequest_);
   size_t reqNumToCreate =
     maxOutstandingRequest_ <= dispatcher_->countOutstandingRequest() ?
@@ -402,6 +409,7 @@ void DefaultBtInteractive::addRequests() {
     std::vector<SharedHandle<BtMessage> > requests;
     requests.reserve(reqNumToCreate);
     if(pieceStorage_->isEndGame()) {
+      logger_->debug("ENDGAME");
       btRequestFactory_->createRequestMessagesOnEndGame(requests,reqNumToCreate);
     } else {
       btRequestFactory_->createRequestMessages(requests, reqNumToCreate);

src/DefaultPieceStorage.cc

@@ -71,6 +71,7 @@ DefaultPieceStorage::DefaultPieceStorage
   bitfieldMan_(new BitfieldMan(downloadContext->getPieceLength(),
                                downloadContext->getTotalLength())),
   diskWriterFactory_(new DefaultDiskWriterFactory()),
+  endGame_(false),
   endGamePieceNum_(END_GAME_PIECE_NUM),
   logger_(LogFactory::getInstance()),
   option_(option),
@@ -82,11 +83,6 @@ DefaultPieceStorage::~DefaultPieceStorage() {
   delete bitfieldMan_;
 }
 
-bool DefaultPieceStorage::isEndGame()
-{
-  return bitfieldMan_->countMissingBlock() <= endGamePieceNum_;
-}
-
 bool DefaultPieceStorage::getMissingPieceIndex(size_t& index,
                                                const unsigned char* bitfield,
                                                size_t length)

src/DefaultPieceStorage.h

@@ -78,6 +78,7 @@ private:
   SharedHandle<DiskWriterFactory> diskWriterFactory_;
   std::deque<SharedHandle<Piece> > usedPieces_;
 
+  bool endGame_;
   size_t endGamePieceNum_;
   Logger* logger_;
   const Option* option_;
@@ -187,8 +188,16 @@ public:
 
   virtual bool isSelectiveDownloadingMode();
 
-  virtual bool isEndGame();
+  virtual bool isEndGame()
+  {
+    return endGame_;
+  }
   
+  virtual void enterEndGame()
+  {
+    endGame_ = true;
+  }
+
   virtual SharedHandle<DiskAdaptor> getDiskAdaptor();
 
   virtual size_t getPieceLength(size_t index);

src/PieceStorage.h

@@ -189,6 +189,9 @@ public:
 
   virtual bool isEndGame() = 0;
 
+  virtual void enterEndGame() = 0;
+
+  // TODO We can remove this.
   virtual void setEndGamePieceNum(size_t num) = 0;
 
   virtual SharedHandle<DiskAdaptor> getDiskAdaptor() = 0;

src/UnknownLengthPieceStorage.h

@@ -211,6 +211,8 @@ public:
     return false;
   }
 
+  virtual void enterEndGame() {}
+
   virtual void setEndGamePieceNum(size_t num) {}
 
   virtual SharedHandle<DiskAdaptor> getDiskAdaptor();

test/MockPieceStorage.h

@@ -190,8 +190,8 @@ public:
 
   virtual void setEndGamePieceNum(size_t num) {}
 
-  void setEndGame(bool flag) {
-    this->endGame = flag;
+  virtual void enterEndGame() {
+    this->endGame = true;
   }
 
   virtual SharedHandle<DiskAdaptor> getDiskAdaptor() {