diff --git a/ChangeLog b/ChangeLog
index d41ce547..229de382 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2010-06-09  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Made protected member variable private. Added accessor funcs.
+	* src/AutoSaveCommand.cc
+	* src/BtStopDownloadCommand.cc
+	* src/DHTAutoSaveCommand.cc
+	* src/DHTBucketRefreshCommand.cc
+	* src/DHTPeerAnnounceCommand.cc
+	* src/DHTTokenUpdateCommand.cc
+	* src/HaveEraseCommand.cc
+	* src/TimeBasedCommand.h
+	* src/TimedHaltCommand.cc
+
 2010-06-09  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Made protected member variable private. Added accessor funcs.
diff --git a/src/AutoSaveCommand.cc b/src/AutoSaveCommand.cc
index 2fd7001d..9784f948 100644
--- a/src/AutoSaveCommand.cc
+++ b/src/AutoSaveCommand.cc
@@ -49,14 +49,15 @@ AutoSaveCommand::~AutoSaveCommand() {}
 
 void AutoSaveCommand::preProcess()
 {
-  if(_e->getRequestGroupMan()->downloadFinished() || _e->isHaltRequested()) {
-    _exit = true;
+  if(getDownloadEngine()->getRequestGroupMan()->downloadFinished() ||
+     getDownloadEngine()->isHaltRequested()) {
+    enableExit();
   }
 }
 
 void AutoSaveCommand::process()
 {
-  _e->getRequestGroupMan()->save();
+  getDownloadEngine()->getRequestGroupMan()->save();
 }
 
 } // namespace aria2
diff --git a/src/BtStopDownloadCommand.cc b/src/BtStopDownloadCommand.cc
index 8f397ef3..eead280e 100644
--- a/src/BtStopDownloadCommand.cc
+++ b/src/BtStopDownloadCommand.cc
@@ -57,14 +57,14 @@ BtStopDownloadCommand::BtStopDownloadCommand
 void BtStopDownloadCommand::preProcess()
 {
   if(_btRuntime->isHalt() || _pieceStorage->downloadFinished()) {
-    _exit = true;
+    enableExit();
   }
   if(_checkPoint.difference(global::wallclock) >= _timeout) {
     getLogger()->notice("GID#%s Stop downloading torrent due to"
                         " --bt-stop-timeout option.",
                         util::itos(_requestGroup->getGID()).c_str());
     _requestGroup->setHaltRequested(true);
-    _exit = true;
+    enableExit();
   }
 }
 
diff --git a/src/DHTAutoSaveCommand.cc b/src/DHTAutoSaveCommand.cc
index 78d4fc7e..5a908457 100644
--- a/src/DHTAutoSaveCommand.cc
+++ b/src/DHTAutoSaveCommand.cc
@@ -61,16 +61,18 @@
 
 namespace aria2 {
 
-DHTAutoSaveCommand::DHTAutoSaveCommand(cuid_t cuid, DownloadEngine* e, time_t interval):
+DHTAutoSaveCommand::DHTAutoSaveCommand
+(cuid_t cuid, DownloadEngine* e, time_t interval):
   TimeBasedCommand(cuid, e, interval) {}
 
 DHTAutoSaveCommand::~DHTAutoSaveCommand() {}
 
 void DHTAutoSaveCommand::preProcess()
 {
-  if(_e->getRequestGroupMan()->downloadFinished() || _e->isHaltRequested()) {
+  if(getDownloadEngine()->getRequestGroupMan()->downloadFinished() ||
+     getDownloadEngine()->isHaltRequested()) {
     save();
-    _exit = true;
+    enableExit();
   }
 }
 
@@ -81,7 +83,8 @@ void DHTAutoSaveCommand::process()
 
 void DHTAutoSaveCommand::save()
 {
-  std::string dhtFile = _e->getOption()->get(PREF_DHT_FILE_PATH);
+  std::string dhtFile =
+    getDownloadEngine()->getOption()->get(PREF_DHT_FILE_PATH);
   getLogger()->info("Saving DHT routing table to %s.", dhtFile.c_str());
 
   std::string tempFile = dhtFile;
@@ -142,7 +145,8 @@ void DHTAutoSaveCommand::setLocalNode(const SharedHandle<DHTNode>& localNode)
   _localNode = localNode;
 }
 
-void DHTAutoSaveCommand::setRoutingTable(const SharedHandle<DHTRoutingTable>& routingTable)
+void DHTAutoSaveCommand::setRoutingTable
+(const SharedHandle<DHTRoutingTable>& routingTable)
 {
   _routingTable = routingTable;
 }
diff --git a/src/DHTBucketRefreshCommand.cc b/src/DHTBucketRefreshCommand.cc
index ab42e1c5..85ba9552 100644
--- a/src/DHTBucketRefreshCommand.cc
+++ b/src/DHTBucketRefreshCommand.cc
@@ -54,7 +54,10 @@ DHTBucketRefreshCommand::~DHTBucketRefreshCommand() {}
 
 void DHTBucketRefreshCommand::preProcess()
 {
-  _exit = _e->getRequestGroupMan()->downloadFinished() || _e->isHaltRequested();
+  if(getDownloadEngine()->getRequestGroupMan()->downloadFinished() ||
+     getDownloadEngine()->isHaltRequested()) {
+    enableExit();
+  }
 }
 
 void DHTBucketRefreshCommand::process()
@@ -62,17 +65,20 @@ void DHTBucketRefreshCommand::process()
   _taskQueue->addPeriodicTask1(_taskFactory->createBucketRefreshTask());
 }
 
-void DHTBucketRefreshCommand::setRoutingTable(const SharedHandle<DHTRoutingTable>& routingTable)
+void DHTBucketRefreshCommand::setRoutingTable
+(const SharedHandle<DHTRoutingTable>& routingTable)
 {
   _routingTable = routingTable;
 }
 
-void DHTBucketRefreshCommand::setTaskQueue(const SharedHandle<DHTTaskQueue>& taskQueue)
+void DHTBucketRefreshCommand::setTaskQueue
+(const SharedHandle<DHTTaskQueue>& taskQueue)
 {
   _taskQueue = taskQueue;
 }
 
-void DHTBucketRefreshCommand::setTaskFactory(const SharedHandle<DHTTaskFactory>& taskFactory)
+void DHTBucketRefreshCommand::setTaskFactory
+(const SharedHandle<DHTTaskFactory>& taskFactory)
 {
   _taskFactory = taskFactory;
 }
diff --git a/src/DHTPeerAnnounceCommand.cc b/src/DHTPeerAnnounceCommand.cc
index f2b81f8c..1aa16b41 100644
--- a/src/DHTPeerAnnounceCommand.cc
+++ b/src/DHTPeerAnnounceCommand.cc
@@ -54,7 +54,10 @@ DHTPeerAnnounceCommand::~DHTPeerAnnounceCommand() {}
 
 void DHTPeerAnnounceCommand::preProcess()
 {
-  _exit = _e->getRequestGroupMan()->downloadFinished() || _e->isHaltRequested();
+  if(getDownloadEngine()->getRequestGroupMan()->downloadFinished() ||
+     getDownloadEngine()->isHaltRequested()) {
+    enableExit();
+  }
 }
 
 void DHTPeerAnnounceCommand::process()
@@ -66,7 +69,8 @@ void DHTPeerAnnounceCommand::process()
   }
 }
 
-void DHTPeerAnnounceCommand::setPeerAnnounceStorage(const SharedHandle<DHTPeerAnnounceStorage>& storage)
+void DHTPeerAnnounceCommand::setPeerAnnounceStorage
+(const SharedHandle<DHTPeerAnnounceStorage>& storage)
 {
   _peerAnnounceStorage = storage;
 }
diff --git a/src/DHTTokenUpdateCommand.cc b/src/DHTTokenUpdateCommand.cc
index ea57e335..af80654a 100644
--- a/src/DHTTokenUpdateCommand.cc
+++ b/src/DHTTokenUpdateCommand.cc
@@ -55,7 +55,10 @@ DHTTokenUpdateCommand::~DHTTokenUpdateCommand() {}
 
 void DHTTokenUpdateCommand::preProcess()
 {
-  _exit = _e->getRequestGroupMan()->downloadFinished() || _e->isHaltRequested();
+  if(getDownloadEngine()->getRequestGroupMan()->downloadFinished() ||
+     getDownloadEngine()->isHaltRequested()) {
+    enableExit();
+  }
 }
 
 void DHTTokenUpdateCommand::process()
diff --git a/src/HaveEraseCommand.cc b/src/HaveEraseCommand.cc
index 4fce7c58..0b560303 100644
--- a/src/HaveEraseCommand.cc
+++ b/src/HaveEraseCommand.cc
@@ -51,17 +51,20 @@ HaveEraseCommand::~HaveEraseCommand() {}
 
 void HaveEraseCommand::preProcess()
 {
-  if(_e->getRequestGroupMan()->downloadFinished() || _e->isHaltRequested()) {
-    _exit = true;
+  if(getDownloadEngine()->getRequestGroupMan()->downloadFinished() ||
+     getDownloadEngine()->isHaltRequested()) {
+    enableExit();
   }
 }
 
 void HaveEraseCommand::process()
 {
-  size_t numLoop = _e->getRequestGroupMan()->countRequestGroup();
+  size_t numLoop =
+    getDownloadEngine()->getRequestGroupMan()->countRequestGroup();
   for(size_t i = 0; i < numLoop; ++i) {
     PieceStorageHandle ps =
-      _e->getRequestGroupMan()->getRequestGroup(i)->getPieceStorage();
+      getDownloadEngine()->getRequestGroupMan()->getRequestGroup(i)->
+      getPieceStorage();
     if(!ps.isNull()) {
       ps->removeAdvertisedPiece(5);
     }
diff --git a/src/TimeBasedCommand.h b/src/TimeBasedCommand.h
index dc5f0c38..488df5b7 100644
--- a/src/TimeBasedCommand.h
+++ b/src/TimeBasedCommand.h
@@ -44,7 +44,7 @@ class DownloadEngine;
 
 class TimeBasedCommand : public Command
 {
-protected:
+private:
   DownloadEngine* _e;
 
   /**
@@ -59,8 +59,23 @@ protected:
   time_t _interval; // unit: sec
 
   bool _routineCommand;
-private:
+
   Timer _checkPoint;
+protected:
+  DownloadEngine* getDownloadEngine() const
+  {
+    return _e;
+  }
+
+  void enableExit()
+  {
+    _exit = true;
+  }
+
+  time_t getInterval() const
+  {
+    return _interval;
+  }
 public:
   /**
    * preProcess() is called each time when excute() is called.
diff --git a/src/TimedHaltCommand.cc b/src/TimedHaltCommand.cc
index 1921466f..ee3250f2 100644
--- a/src/TimedHaltCommand.cc
+++ b/src/TimedHaltCommand.cc
@@ -54,22 +54,23 @@ TimedHaltCommand::~TimedHaltCommand() {}
 
 void TimedHaltCommand::preProcess()
 {
-  if(_e->getRequestGroupMan()->downloadFinished() || _e->isHaltRequested()) {
-    _exit = true;
+  if(getDownloadEngine()->getRequestGroupMan()->downloadFinished() ||
+     getDownloadEngine()->isHaltRequested()) {
+    enableExit();
   }
 }
 
 void TimedHaltCommand::process()
 {
-  if(!_e->isHaltRequested()) {
-    getLogger()->notice(MSG_TIME_HAS_PASSED, _interval);
+  if(!getDownloadEngine()->isHaltRequested()) {
+    getLogger()->notice(MSG_TIME_HAS_PASSED, getInterval());
     if(_forceHalt) {
       getLogger()->notice("This is emergency shutdown.");
-      _e->requestForceHalt();
+      getDownloadEngine()->requestForceHalt();
     } else {
-      _e->requestHalt();
+      getDownloadEngine()->requestHalt();
     }
-    _exit = true;
+    enableExit();
   }
 }