--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Sources/ResourcesCache.cpp	Fri Oct 04 17:25:46 2024 +0200
@@ -0,0 +1,138 @@
+/**
+ * SPDX-FileCopyrightText: 2023-2024 Sebastien Jodogne, UCLouvain, Belgium
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+/**
+ * STL plugin for Orthanc
+ * Copyright (C) 2023-2024 Sebastien Jodogne, UCLouvain, 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.
+ *
+ * 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 "ResourcesCache.h"
+
+#include "../Resources/Orthanc/Plugins/OrthancPluginCppWrapper.h"
+
+#include <Compatibility.h>
+#include <SystemToolbox.h>
+
+
+// Forward declaration
+void ReadStaticAsset(std::string& target,
+                     const std::string& path);
+
+
+class ResourcesCache::RestOutputHandler : public IHandler
+{
+private:
+  OrthancPluginRestOutput* output_;
+  std::string              mime_;
+
+public:
+  RestOutputHandler(OrthancPluginRestOutput* output,
+                    const std::string& mime) :
+    output_(output),
+    mime_(mime)
+  {
+  }
+
+  virtual void Apply(const std::string& resource) ORTHANC_OVERRIDE
+  {
+    OrthancPluginAnswerBuffer(OrthancPlugins::GetGlobalContext(), output_,
+                              resource.c_str(), resource.size(), mime_.c_str());
+  }
+};
+
+
+class ResourcesCache::StoreResourceIntoString : public IHandler
+{
+private:
+  std::string& target_;
+
+public:
+  StoreResourceIntoString(std::string& target) :
+    target_(target)
+  {
+  }
+
+  virtual void Apply(const std::string& resource) ORTHANC_OVERRIDE
+  {
+    target_ = resource;
+  }
+};
+
+
+ResourcesCache::~ResourcesCache()
+{
+  for (Content::iterator it = content_.begin(); it != content_.end(); ++it)
+  {
+    assert(it->second != NULL);
+    delete it->second;
+  }
+}
+
+
+void ResourcesCache::Apply(IHandler& handler,
+                           const std::string& path)
+{
+  {
+    // Check whether the cache already contains the resource
+    boost::shared_lock<boost::shared_mutex> lock(mutex_);
+
+    Content::const_iterator found = content_.find(path);
+
+    if (found != content_.end())
+    {
+      assert(found->second != NULL);
+      handler.Apply(*found->second);
+      return;
+    }
+  }
+
+  // This resource has not been cached yet
+
+  std::unique_ptr<std::string> item(new std::string);
+  ReadStaticAsset(*item, path);
+  handler.Apply(*item);
+
+  {
+    // Store the resource into the cache
+    boost::unique_lock<boost::shared_mutex> lock(mutex_);
+
+    if (content_.find(path) == content_.end())
+    {
+      content_[path] = item.release();
+    }
+  }
+}
+
+
+void ResourcesCache::Answer(OrthancPluginRestOutput* output,
+                            const std::string& path)
+{
+  const std::string mime = Orthanc::EnumerationToString(Orthanc::SystemToolbox::AutodetectMimeType(path));
+
+  RestOutputHandler handler(output, mime);
+  Apply(handler, path);
+}
+
+
+void ResourcesCache::ReadResource(std::string& target,
+                                  const std::string& path)
+{
+  StoreResourceIntoString handler(target);
+  Apply(handler, path);
+}