--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancFramework/Sources/FileStorage/StorageCache.cpp	Thu Sep 30 12:14:19 2021 +0200
@@ -0,0 +1,118 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2021 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program. If not, see
+ * <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "../PrecompiledHeaders.h"
+#include "StorageCache.h"
+
+#include "../Compatibility.h"
+#include "../OrthancException.h"
+
+
+
+namespace Orthanc
+{
+  bool IsAcceptedContentType(FileContentType contentType)
+  {
+    return contentType == FileContentType_Dicom ||
+      contentType == FileContentType_DicomUntilPixelData ||
+      contentType == FileContentType_DicomAsJson;
+  }
+
+  const char* ToString(FileContentType contentType)
+  {
+    switch (contentType)
+    {
+      case FileContentType_Dicom:
+        return "dicom";
+      case FileContentType_DicomUntilPixelData:
+        return "dicom-header";
+      case FileContentType_DicomAsJson:
+        return "dicom-json";
+      default:
+        throw OrthancException(ErrorCode_InternalError,
+                               "ContentType not supported in StorageCache");
+    }
+  }
+
+  void GetCacheKey(std::string& key, const std::string& uuid, FileContentType contentType)
+  {
+    key = uuid + ":" + std::string(ToString(contentType));
+  }
+  
+  void StorageCache::SetMaximumSize(size_t size)
+  {
+    cache_.SetMaximumSize(size);
+  }
+
+  void StorageCache::Add(const std::string& uuid, 
+                         FileContentType contentType,
+                         const std::string& value)
+  {
+    if (!IsAcceptedContentType(contentType))
+    {
+      return;
+    }
+
+    std::string key;
+    GetCacheKey(key, uuid, contentType);
+    cache_.Add(key, value);
+  }
+
+  void StorageCache::Add(const std::string& uuid, 
+                         FileContentType contentType,
+                         const void* buffer,
+                         size_t size)
+  {
+    if (!IsAcceptedContentType(contentType))
+    {
+      return;
+    }
+    
+    std::string key;
+    GetCacheKey(key, uuid, contentType);
+    cache_.Add(key, buffer, size);
+  }
+
+  void StorageCache::Invalidate(const std::string& uuid, FileContentType contentType)
+  {
+    std::string key;
+    GetCacheKey(key, uuid, contentType);
+    cache_.Invalidate(key);
+  }
+
+  bool StorageCache::Fetch(std::string& value, 
+                           const std::string& uuid,
+                           FileContentType contentType)
+  {
+    if (!IsAcceptedContentType(contentType))
+    {
+      return false;
+    }
+
+    std::string key;
+    GetCacheKey(key, uuid, contentType);
+
+    return cache_.Fetch(value, key);
+  }
+
+
+}
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