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// Copyright Yahoo. 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_fun.h>
#include <vespa/vespalib/stllike/hash_map.h>
#include <mutex>
#include <unordered_map>
namespace search { class AttributeGuard; }
namespace search::attribute {
class AttributeReadGuard;
class IAttributeVector;
class ImportedAttributeVector;
}
namespace proton {
class ImportedAttributesRepo;
/**
* Short lived context class that gives access to all imported attributes in a given repo.
*
* Attribute guards and enum guards are cached in this class and released upon destruction.
*/
class ImportedAttributesContext : public search::attribute::IAttributeContext {
private:
using AttributeGuard = search::AttributeGuard;
using AttributeReadGuard = search::attribute::AttributeReadGuard;
using IAttributeVector = search::attribute::IAttributeVector;
using ImportedAttributeVector = search::attribute::ImportedAttributeVector;
using IAttributeFunctor = search::attribute::IAttributeFunctor;
using AttributeCache = std::unordered_map<vespalib::string, std::unique_ptr<AttributeReadGuard>, vespalib::hash<vespalib::string>>;
using LockGuard = std::lock_guard<std::mutex>;
const ImportedAttributesRepo &_repo;
mutable AttributeCache _guardedAttributes;
mutable AttributeCache _enumGuardedAttributes;
mutable std::mutex _cacheMutex;
const IAttributeVector *getOrCacheAttribute(const vespalib::string &name, AttributeCache &attributes,
bool stableEnumGuard, const LockGuard &) const;
public:
ImportedAttributesContext(const ImportedAttributesRepo &repo);
~ImportedAttributesContext() override;
// Implements search::attribute::IAttributeContext
const IAttributeVector *getAttribute(const vespalib::string &name) const override;
const IAttributeVector *getAttributeStableEnum(const vespalib::string &name) const override;
void getAttributeList(std::vector<const IAttributeVector *> &list) const override;
void releaseEnumGuards() override;
void asyncForAttribute(const vespalib::string &name, std::unique_ptr<IAttributeFunctor> func) const override;
};
}
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