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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
#ifndef ICE_GRID_CACHE_H
#define ICE_GRID_CACHE_H
#include <IceGrid/Util.h>
#include <IceGrid/TraceLevels.h>
#include <mutex>
namespace IceGrid
{
class SynchronizationCallback
{
public:
virtual void synchronized() = 0;
virtual void synchronized(std::exception_ptr) = 0;
};
template<typename Key, typename Value>
class Cache
{
using ValueType = std::shared_ptr<Value>;
using ValueMap = std::map<Key, ValueType>;
public:
Cache() : _entriesHint(_entries.end())
{
}
virtual ~Cache() = default;
bool
has(const Key& key) const
{
std::lock_guard<std::mutex> lock(_mutex);
return getImpl(key) != nullptr;
}
void
remove(const Key& key)
{
std::lock_guard<std::mutex> lock(_mutex);
removeImpl(key);
}
void
setTraceLevels(const std::shared_ptr<TraceLevels>& traceLevels)
{
_traceLevels = traceLevels;
}
const std::shared_ptr<TraceLevels>& getTraceLevels() const { return _traceLevels; }
protected:
virtual ValueType
getImpl(const Key& key) const
{
auto p = const_cast<ValueMap&>(_entries).end();
if(_entriesHint != p)
{
if(_entriesHint->first == key)
{
p = _entriesHint;
}
}
if(p == const_cast<ValueMap&>(_entries).end())
{
p = const_cast<ValueMap&>(_entries).find(key);
}
if(p != const_cast<ValueMap&>(_entries).end())
{
const_cast<typename ValueMap::iterator&>(_entriesHint) = p;
return p->second;
}
else
{
return nullptr;
}
}
virtual ValueType
addImpl(const Key& key, const ValueType& entry)
{
_entriesHint = _entries.insert(_entriesHint, { key, entry });
return entry;
}
virtual void
removeImpl(const Key& key)
{
auto p = _entries.end();
if(_entriesHint != _entries.end())
{
if(_entriesHint->first == key)
{
p = _entriesHint;
}
}
if(p == _entries.end())
{
p = _entries.find(key);
}
assert(p != _entries.end());
if(p->second->canRemove())
{
_entries.erase(p);
_entriesHint = _entries.end();
}
else
{
_entriesHint = p;
}
}
std::shared_ptr<TraceLevels> _traceLevels;
ValueMap _entries;
typename ValueMap::iterator _entriesHint;
mutable std::mutex _mutex;
std::condition_variable _condVar;
};
template<typename T>
class CacheByString : public Cache<std::string, T>
{
public:
std::vector<std::string>
getAll(const std::string& expr)
{
std::lock_guard<std::mutex> lock(Cache<std::string, T>::_mutex);
return getMatchingKeys<std::map<std::string, std::shared_ptr<T>>>(Cache<std::string, T>::_entries, expr);
}
};
};
#endif
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