--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancCppClient/ThreadedCommandProcessor.cpp	Mon Jun 01 11:12:20 2015 +0200
@@ -0,0 +1,211 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, 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 "ThreadedCommandProcessor.h"
+
+#include "../OrthancException.h"
+
+namespace Orthanc
+{
+  static const int32_t TIMEOUT = 10;
+
+
+  void ThreadedCommandProcessor::Processor(ThreadedCommandProcessor* that)
+  {
+    while (!that->done_)
+    {
+      std::auto_ptr<IDynamicObject> command(that->queue_.Dequeue(TIMEOUT));
+
+      if (command.get() != NULL)
+      {
+        bool success = false;
+
+        try
+        {
+          if (that->success_)
+          {
+            // No command has failed so far
+
+            if (that->cancel_)
+            {
+              // The commands have been canceled. Skip the execution
+              // of this command, yet mark it as succeeded.
+              success = true;
+            }
+            else
+            {
+              success = dynamic_cast<ICommand&>(*command).Execute();
+            }
+          }
+          else
+          {
+            // A command has already failed. Skip the execution of this command.
+          }
+        }
+        catch (OrthancException)
+        {
+        }
+
+        {
+          boost::mutex::scoped_lock lock(that->mutex_);
+          assert(that->remainingCommands_ > 0);
+          that->remainingCommands_--;
+
+          if (!success)
+          {
+            if (!that->cancel_ && that->listener_ && that->success_)
+            {
+              // This is the first command that fails
+              that->listener_->SignalFailure();
+            }
+
+            that->success_ = false;
+          }
+          else
+          {
+            if (!that->cancel_ && that->listener_)
+            {
+              if (that->remainingCommands_ == 0)
+              {
+                that->listener_->SignalSuccess(that->totalCommands_);
+              }
+              else
+              {
+                that->listener_->SignalProgress(that->totalCommands_ - that->remainingCommands_,
+                                                that->totalCommands_);
+              }
+            }
+          }
+
+          that->processedCommand_.notify_all();
+        }
+      }
+    }
+  }
+
+
+  ThreadedCommandProcessor::ThreadedCommandProcessor(unsigned int numThreads)
+  {
+    if (numThreads < 1)
+    {
+      throw OrthancException(ErrorCode_ParameterOutOfRange);
+    }
+
+    listener_ = NULL;
+    success_ = true;
+    done_ = false;
+    cancel_ = false;
+    threads_.resize(numThreads);
+    remainingCommands_ = 0;
+    totalCommands_ = 0;
+
+    for (unsigned int i = 0; i < numThreads; i++)
+    {
+      threads_[i] = new boost::thread(Processor, this);
+    }
+  }
+
+
+  ThreadedCommandProcessor::~ThreadedCommandProcessor()
+  {
+    done_ = true;
+      
+    for (unsigned int i = 0; i < threads_.size(); i++)
+    {
+      boost::thread* t = threads_[i];
+
+      if (t != NULL)
+      {
+        if (t->joinable())
+        {
+          t->join();
+        }
+
+        delete t;
+      }
+    }
+  }
+
+
+  void ThreadedCommandProcessor::Post(ICommand* command)
+  {
+    if (command == NULL)
+    {
+      throw OrthancException(ErrorCode_ParameterOutOfRange);
+    }
+
+    boost::mutex::scoped_lock lock(mutex_);
+    queue_.Enqueue(command);
+    remainingCommands_++;
+    totalCommands_++;
+  }
+
+
+  bool ThreadedCommandProcessor::Join()
+  {
+    boost::mutex::scoped_lock lock(mutex_);
+
+    while (remainingCommands_ != 0)
+    {
+      processedCommand_.wait(lock);
+    }
+
+    if (cancel_ && listener_)
+    {
+      listener_->SignalCancel();
+    }
+
+    // Reset the sequence counters for subsequent commands
+    bool hasSucceeded = success_;
+    success_ = true;
+    totalCommands_ = 0;
+    cancel_ = false;
+
+    return hasSucceeded;
+  }
+
+
+  void ThreadedCommandProcessor::Cancel()
+  {
+    boost::mutex::scoped_lock lock(mutex_);
+
+    cancel_ = true;
+  }
+
+
+  void ThreadedCommandProcessor::SetListener(IListener& listener)
+  {
+    boost::mutex::scoped_lock lock(mutex_);
+    listener_ = &listener;
+  }
+}