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/**
* 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) 2024-2025 Orthanc Team SRL, Belgium
* Copyright (C) 2021-2025 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/>.
**/
#include "ViewerPrefetchPolicy.h"
#include "ViewerToolbox.h"
#include "Cache/CacheScheduler.h"
#include <Toolbox.h>
static const Json::Value::ArrayIndex PREFETCH_FORWARD = 10;
static const Json::Value::ArrayIndex PREFETCH_BACKWARD = 3;
namespace OrthancPlugins
{
void ViewerPrefetchPolicy::ApplySeries(std::list<CacheIndex>& toPrefetch,
CacheScheduler& cache,
const std::string& series,
const std::string& content)
{
Json::Value json;
if (!Orthanc::Toolbox::ReadJson(json, content) ||
!json.isMember("Slices"))
{
return;
}
const Json::Value& instances = json["Slices"];
if (instances.type() != Json::arrayValue)
{
return;
}
for (Json::Value::ArrayIndex i = 0;
i < instances.size() && i < PREFETCH_FORWARD;
i++)
{
std::string item = "jpeg95-" + instances[i].asString();
toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item));
}
}
void ViewerPrefetchPolicy::ApplyInstance(std::list<CacheIndex>& toPrefetch,
CacheScheduler& cache,
const std::string& path)
{
size_t separator = path.find('-');
if (separator == std::string::npos)
{
return;
}
std::string compression = path.substr(0, separator + 1);
std::string instanceAndFrame = path.substr(separator + 1);
std::string instanceId = instanceAndFrame.substr(0, instanceAndFrame.find('_'));
Json::Value instance;
if (!GetJsonFromOrthanc(instance, context_, "/instances/" + instanceId) ||
!instance.isMember("ParentSeries"))
{
return;
}
std::string tmp;
if (!cache.Access(tmp, CacheBundle_SeriesInformation, instance["ParentSeries"].asString()))
{
return;
}
Json::Value series;
if (!Orthanc::Toolbox::ReadJson(series, tmp) ||
!series.isMember("Slices"))
{
return;
}
const Json::Value& instances = series["Slices"];
if (instances.type() != Json::arrayValue)
{
return;
}
Json::Value::ArrayIndex position = 0;
while (position < instances.size())
{
if (instances[position] == instanceAndFrame)
{
break;
}
position++;
}
if (position == instances.size())
{
return;
}
for (Json::Value::ArrayIndex i = position;
i < instances.size() && i < position + PREFETCH_FORWARD;
i++)
{
std::string item = compression + instances[i].asString();
toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item));
}
for (Json::Value::ArrayIndex i = position;
i >= 0 && i > position - PREFETCH_BACKWARD; )
{
i--;
std::string item = compression + instances[i].asString();
toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item));
}
}
void ViewerPrefetchPolicy::Apply(std::list<CacheIndex>& toPrefetch,
CacheScheduler& cache,
const CacheIndex& accessed,
const std::string& content)
{
switch (accessed.GetBundle())
{
case CacheBundle_SeriesInformation:
ApplySeries(toPrefetch, cache, accessed.GetItem(), content);
return;
case CacheBundle_DecodedImage:
ApplyInstance(toPrefetch, cache, accessed.GetItem());
return;
default:
return;
}
}
}
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