--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancFramework/Sources/DicomNetworking/TimeoutDicomConnectionManager.cpp	Wed Jun 10 20:30:34 2020 +0200
@@ -0,0 +1,138 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2020 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "../PrecompiledHeaders.h"
+#include "TimeoutDicomConnectionManager.h"
+
+#include "../Logging.h"
+#include "../OrthancException.h"
+
+namespace Orthanc
+{
+  static boost::posix_time::ptime GetNow()
+  {
+    return boost::posix_time::microsec_clock::universal_time();
+  }
+
+
+  TimeoutDicomConnectionManager::Lock::Lock(TimeoutDicomConnectionManager& that,
+                                            const std::string& localAet,
+                                            const RemoteModalityParameters& remote) : 
+    that_(that),
+    lock_(that_.mutex_)
+  {
+    // Calling "Touch()" will be done by the "~Lock()" destructor
+    that_.OpenInternal(localAet, remote);
+  }
+
+  
+  TimeoutDicomConnectionManager::Lock::~Lock()
+  {
+    that_.TouchInternal();
+  }
+
+  
+  DicomStoreUserConnection& TimeoutDicomConnectionManager::Lock::GetConnection()
+  {
+    if (that_.connection_.get() == NULL)
+    {
+      // The allocation should have been done by "that_.Open()" in the constructor
+      throw OrthancException(ErrorCode_InternalError);
+    }
+    else
+    {
+      return *that_.connection_;
+    }
+  }
+
+
+  // Mutex must be locked
+  void TimeoutDicomConnectionManager::TouchInternal()
+  {
+    lastUse_ = GetNow();
+  }
+
+
+  // Mutex must be locked
+  void TimeoutDicomConnectionManager::OpenInternal(const std::string& localAet,
+                                                   const RemoteModalityParameters& remote)
+  {
+    DicomAssociationParameters other(localAet, remote);
+    
+    if (connection_.get() == NULL ||
+        !connection_->GetParameters().IsEqual(other))
+    {
+      connection_.reset(new DicomStoreUserConnection(other));
+    }
+  }
+
+
+  // Mutex must be locked
+  void TimeoutDicomConnectionManager::CloseInternal()
+  {
+    if (connection_.get() != NULL)
+    {
+      LOG(INFO) << "Closing inactive DICOM association with modality: "
+                << connection_->GetParameters().GetRemoteModality().GetApplicationEntityTitle();
+
+      connection_.reset(NULL);
+    }
+  }
+
+
+  void TimeoutDicomConnectionManager::SetInactivityTimeout(unsigned int milliseconds)
+  {
+    boost::mutex::scoped_lock lock(mutex_);
+    timeout_ = boost::posix_time::milliseconds(milliseconds);
+    CloseInternal();
+  }
+
+
+  unsigned int TimeoutDicomConnectionManager::GetInactivityTimeout()
+  {
+    boost::mutex::scoped_lock lock(mutex_);
+    return static_cast<unsigned int>(timeout_.total_milliseconds());
+  }
+
+
+  void TimeoutDicomConnectionManager::CloseIfInactive()
+  {
+    boost::mutex::scoped_lock lock(mutex_);
+
+    if (connection_.get() != NULL &&
+        (GetNow() - lastUse_) >= timeout_)
+    {
+      CloseInternal();
+    }
+  }
+}