--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Toolbox/OrthancAsynchronousWebService.cpp	Mon May 22 21:43:49 2017 +0200
@@ -0,0 +1,264 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017 Osimis, Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * 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
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "OrthancAsynchronousWebService.h"
+
+#include "../../Resources/Orthanc/Core/Logging.h"
+#include "../../Resources/Orthanc/Core/OrthancException.h"
+#include "../../Resources/Orthanc/Core/MultiThreading/SharedMessageQueue.h"
+#include "../../Resources/Orthanc/Plugins/Samples/Common/OrthancHttpConnection.h"
+
+namespace OrthancStone
+{
+  class OrthancAsynchronousWebService::PendingRequest : public Orthanc::IDynamicObject
+  {
+  private:
+    bool                                    isPost_;
+    ICallback&                              callback_;
+    std::string                             uri_;
+    std::string                             body_;
+    std::auto_ptr<Orthanc::IDynamicObject>  payload_;
+
+    PendingRequest(bool isPost,
+                   ICallback& callback,
+                   const std::string& uri,
+                   const std::string& body,
+                   Orthanc::IDynamicObject* payload) :
+      isPost_(isPost),
+      callback_(callback),
+      uri_(uri),
+      body_(body),
+      payload_(payload)
+    {
+    }
+    
+  public:
+    static PendingRequest* CreateGetRequest(ICallback& callback,
+                                            const std::string& uri,
+                                            Orthanc::IDynamicObject* payload)
+    {
+      return new PendingRequest(false, callback, uri, "", payload);
+    }
+
+    static PendingRequest* CreatePostRequest(ICallback& callback,
+                                             const std::string& uri,
+                                             const std::string& body,
+                                             Orthanc::IDynamicObject* payload)
+    {
+      return new PendingRequest(true, callback, uri, body, payload);
+    }
+
+    void Execute(OrthancPlugins::OrthancHttpConnection& connection)
+    {
+      if (payload_.get() == NULL)
+      {
+        // Execute() has already been invoked
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);        
+      }
+
+      std::string answer;
+      
+      try
+      {
+        if (isPost_)
+        {
+          connection.RestApiPost(answer, uri_, body_);
+        }
+        else
+        {
+          connection.RestApiGet(answer, uri_);
+        }
+      }
+      catch (Orthanc::OrthancException&)
+      {
+        callback_.NotifyError(uri_, payload_.release());
+      }
+
+      callback_.NotifySuccess(uri_, answer.c_str(), answer.size(), payload_.release());
+    }
+  };
+    
+  class OrthancAsynchronousWebService::PImpl : public boost::noncopyable
+  {
+  private:
+    enum State
+    {
+      State_Init,
+      State_Started,
+      State_Stopped
+    };
+    
+    boost::mutex                   mutex_;
+    State                          state_;
+    Orthanc::WebServiceParameters  orthanc_;
+    std::vector<boost::thread>     threads_;
+    Orthanc::SharedMessageQueue    queue_;
+
+    static void Worker(PImpl* that)
+    {
+      OrthancPlugins::OrthancHttpConnection connection(that->orthanc_);
+      
+      for (;;)
+      {
+        State state;
+        
+        {
+          boost::mutex::scoped_lock lock(that->mutex_);
+          state = that->state_;
+        }
+
+        printf("."); fflush(stdout);
+        if (state == State_Stopped)
+        {
+          break;
+        }
+
+        std::auto_ptr<Orthanc::IDynamicObject> request(that->queue_.Dequeue(100));
+        if (request.get() != NULL)
+        {
+          dynamic_cast<PendingRequest&>(*request).Execute(connection);          
+        }
+      }
+    }
+    
+  public:
+    PImpl(const Orthanc::WebServiceParameters& orthanc,
+          unsigned int threadCount) :
+      state_(State_Init),
+      orthanc_(orthanc),
+      threads_(threadCount)
+    {
+    }
+
+    ~PImpl()
+    {
+      if (state_ == State_Started)
+      {
+        LOG(ERROR) << "You should have manually called OrthancAsynchronousWebService::Stop()";
+        Stop();
+      }
+    }
+
+    void Schedule(PendingRequest* request)
+    {
+      std::auto_ptr<PendingRequest> protection(request);
+
+      if (request == NULL)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+      }
+      
+      boost::mutex::scoped_lock lock(mutex_);
+
+      switch (state_)
+      {
+        case State_Init:
+          LOG(ERROR) << "You must call OrthancAsynchronousWebService::Start()";
+          throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
+
+        case State_Started:
+          queue_.Enqueue(protection.release());
+          break;
+
+        case State_Stopped:
+          LOG(ERROR) << "Cannot schedule a Web request after having "
+                     << "called OrthancAsynchronousWebService::Stop()";
+          break;
+
+        default:
+          throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+      }
+      
+    }
+
+    void Start()
+    {
+      boost::mutex::scoped_lock lock(mutex_);
+
+      if (state_ != State_Init)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
+      }
+      
+      for (size_t i = 0; i < threads_.size(); i++)
+      {
+        threads_[i] = boost::thread(Worker, this);
+      }
+
+      state_ = State_Started;
+    }
+
+    void Stop()
+    {
+      {
+        boost::mutex::scoped_lock lock(mutex_);
+
+        if (state_ != State_Started)
+        {
+          throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
+        }
+
+        state_ = State_Stopped;
+      }
+      
+      for (size_t i = 0; i < threads_.size(); i++)
+      {
+        if (threads_[i].joinable())
+        {
+          threads_[i].join();
+        }
+      }
+    }
+  };
+
+  OrthancAsynchronousWebService::OrthancAsynchronousWebService(
+    const Orthanc::WebServiceParameters& parameters,
+    unsigned int threadCount) :
+    pimpl_(new PImpl(parameters, threadCount))
+  {
+  }
+
+  void  OrthancAsynchronousWebService::ScheduleGetRequest(ICallback& callback,
+                                                          const std::string& uri,
+                                                          Orthanc::IDynamicObject* payload)
+  {
+    pimpl_->Schedule(PendingRequest::CreateGetRequest(callback, uri, payload));
+  }
+  
+
+  void  OrthancAsynchronousWebService::SchedulePostRequest(ICallback& callback,
+                                                           const std::string& uri,
+                                                           const std::string& body,
+                                                           Orthanc::IDynamicObject* payload)
+  {
+    pimpl_->Schedule(PendingRequest::CreatePostRequest(callback, uri, body, payload));
+  }
+
+  void  OrthancAsynchronousWebService::Start()
+  {
+    pimpl_->Start();
+  }
+
+  void  OrthancAsynchronousWebService::Stop()
+  {
+    pimpl_->Stop();
+  }
+}