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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/searchcommon/attribute/iattributecontext.h>
#include <vespa/vespalib/stllike/hash_map.h>
#include "iattributemanager.h"
#include <mutex>
namespace search {
/**
* This class is wrapping an attribute manager and
* implements the IAttributeContext interface to provide read access to attribute vectors.
**/
class AttributeContext : public attribute::IAttributeContext
{
private:
using AttributeMap = vespalib::hash_map<string, std::unique_ptr<attribute::AttributeReadGuard>>;
using IAttributeVector = attribute::IAttributeVector;
using IAttributeFunctor = attribute::IAttributeFunctor;
const IAttributeManager & _manager;
bool _mtSafe;
mutable AttributeMap _attributes;
mutable AttributeMap _enumAttributes;
mutable std::mutex _cacheLock;
const IAttributeVector *getAttribute(AttributeMap & map, const string & name, bool stableEnum) const;
const IAttributeVector *getAttributeMtSafe(AttributeMap & map, const string & name, bool stableEnum) const;
public:
AttributeContext(const IAttributeManager & manager);
~AttributeContext() override;
// Implements IAttributeContext
const attribute::IAttributeVector * getAttribute(const string & name) const override;
void asyncForAttribute(const vespalib::string &name, std::unique_ptr<IAttributeFunctor> func) const override;
const attribute::IAttributeVector * getAttributeStableEnum(const string & name) const override;
void getAttributeList(std::vector<const IAttributeVector *> & list) const override;
void releaseEnumGuards() override;
void enableMultiThreadSafe() override { _mtSafe = true; }
// Give acces to the underlying manager
const IAttributeManager & getManager() const { return _manager; }
};
} // namespace search
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