cache.cpp
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright 2012 The MITRE Corporation *
* *
* Licensed under the Apache License, Version 2.0 (the "License"); *
* you may not use this file except in compliance with the License. *
* You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an "AS IS" BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
* See the License for the specific language governing permissions and *
* limitations under the License. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include <openbr/plugins/openbr_internal.h>
namespace br
{
/*!
* \ingroup transforms
* \brief Caches Transform::project() results.
* \author Josh Klontz \cite jklontz
*/
class CacheTransform : public MetaTransform
{
Q_OBJECT
Q_PROPERTY(br::Transform* transform READ get_transform WRITE set_transform RESET reset_transform)
BR_PROPERTY(br::Transform*, transform, NULL)
static QHash<QString, Template> cache;
static QMutex cacheLock;
public:
~CacheTransform()
{
if (cache.isEmpty()) return;
// Write to cache
QFile file("Cache");
if (!file.open(QFile::WriteOnly))
qFatal("Unable to open %s for writing.", qPrintable(file.fileName()));
QDataStream stream(&file);
stream << cache;
file.close();
}
private:
void init()
{
if (!transform) return;
trainable = transform->trainable;
if (!cache.isEmpty()) return;
// Read from cache
QFile file("Cache");
if (file.exists()) {
if (!file.open(QFile::ReadOnly))
qFatal("Unable to open %s for reading.", qPrintable(file.fileName()));
QDataStream stream(&file);
stream >> cache;
file.close();
}
}
void train(const QList<TemplateList> &data)
{
transform->train(data);
}
void project(const Template &src, Template &dst) const
{
const QString &file = src.file;
if (cache.contains(file)) {
dst = cache[file];
} else {
transform->project(src, dst);
cacheLock.lock();
cache[file] = dst;
cacheLock.unlock();
}
}
};
QHash<QString, Template> CacheTransform::cache;
QMutex CacheTransform::cacheLock;
BR_REGISTER(Transform, CacheTransform)
} // namespace br
#include "core/cache.moc"