--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Plugins/IndexConnectionsPool.h	Fri Jun 23 14:26:58 2023 +0200
@@ -0,0 +1,79 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2023 Osimis S.A., Belgium
+ * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, 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/>.
+ **/
+
+
+#pragma once
+
+#include "IdentifierTag.h"
+#include "IndexBackend.h"
+
+#include <MultiThreading/SharedMessageQueue.h>
+
+#include <list>
+
+namespace OrthancDatabases
+{
+  class IndexConnectionsPool : public boost::noncopyable
+  {
+  private:
+    class ManagerReference;
+
+    std::unique_ptr<IndexBackend>  backend_;
+    OrthancPluginContext*          context_;
+    boost::shared_mutex            connectionsMutex_;
+    size_t                         countConnections_;
+    std::list<DatabaseManager*>    connections_;
+    Orthanc::SharedMessageQueue    availableConnections_;
+
+  public:
+    IndexConnectionsPool(IndexBackend* backend /* takes ownership */,
+                         size_t countConnections);
+
+    ~IndexConnectionsPool();
+
+    OrthancPluginContext* GetContext() const
+    {
+      return context_;
+    }
+
+    void OpenConnections(bool hasIdentifierTags,
+                         const std::list<IdentifierTag>& identifierTags);
+
+    void CloseConnections();
+
+    class Accessor : public boost::noncopyable
+    {
+    private:
+      boost::shared_lock<boost::shared_mutex>  lock_;
+      IndexConnectionsPool&                    pool_;
+      DatabaseManager*                         manager_;
+      
+    public:
+      explicit Accessor(IndexConnectionsPool& pool);
+
+      ~Accessor();
+
+      IndexBackend& GetBackend() const;
+
+      DatabaseManager& GetManager() const;
+    };
+  };
+}