radio/lib/wDatabase/resourcecache.h

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2018-08-04 21:46:25 +00:00
#ifndef RESOURCECACHE_H
#define RESOURCECACHE_H
#include <set>
#include <map>
#include "lmdb++.h"
#include <wModel/model.h>
#include <wModel/file/file.h>
#include <wType/address.h>
#include <wType/string.h>
#include <wType/bytearray.h>
#include <wType/uint64.h>
#include <wType/blob.h>
#include <utils/exception.h>
class ResourceCache : public M::Model
{
Q_OBJECT
public:
ResourceCache(const W::String& dbName, QObject* parent = 0);
~ResourceCache();
void open();
uint64_t addResource(const W::String& path);
void removeResource(uint64_t id);
void clear();
bool has(uint64_t id) const;
W::String getPath(uint64_t id) const;
std::set<uint64_t> getAllIdentificators() const;
W::Handler* subscribeMember;
handler(subscribeMember);
M::Model::ModelType getType() const override;
static const M::Model::ModelType type = resourceCache;
void set(const W::Object & value) override;
void set(W::Object * value) override;
signals:
void countChange(uint64_t count);
protected:
void h_subscribe(const W::Event & ev) override;
handler(get);
W::String* getElement(uint64_t id) const;
public:
const W::String name;
private:
bool opened;
lmdb::env environment;
lmdb::dbi dbi;
std::set<uint64_t> elements;
uint64_t lastIndex;
void checkDirAndOpenEnvironment();
W::Blob* readFile(const W::String& path) const;
class ClosedDB:
public Utils::Exception
{
public:
ClosedDB(const std::string& p_op):Exception(), operation(p_op){}
std::string getMessage() const {
std::string str = "An attempt to perform method ResourceCache::";
str += operation;
str += " but the database is not open";
return str;
}
private:
std::string operation;
};
};
#endif // RESOURCECACHE_H