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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/vespalib/datastore/compaction_spec.h>
#include <vespa/vespalib/datastore/datastorebase.h>
#include <vespa/vespalib/datastore/entryref.h>
#include <vespa/vespalib/datastore/i_compactable.h>
#include <vespa/vespalib/util/generationhandler.h>
namespace vespalib { class nbostream; }
namespace vespalib::datastore { struct ICompactionContext; }
namespace vespalib::eval { struct Value; }
namespace search::tensor {
/**
* Class for storing serialized tensors in memory, used by TensorAttribute.
*
* Serialization format is subject to change. Changes to serialization format
* might also require corresponding changes to implemented optimized tensor
* operations that use the serialized tensor as argument.
*/
class TensorStore : public vespalib::datastore::ICompactable
{
public:
using EntryRef = vespalib::datastore::EntryRef;
typedef vespalib::GenerationHandler::generation_t generation_t;
protected:
vespalib::datastore::DataStoreBase& _store;
vespalib::datastore::CompactionSpec _compaction_spec;
public:
TensorStore(vespalib::datastore::DataStoreBase &store);
virtual ~TensorStore();
virtual void holdTensor(EntryRef ref) = 0;
virtual vespalib::MemoryUsage update_stat(const vespalib::datastore::CompactionStrategy& compaction_strategy) = 0;
virtual std::unique_ptr<vespalib::datastore::ICompactionContext> start_compact(const vespalib::datastore::CompactionStrategy& compaction_strategy) = 0;
virtual EntryRef store_tensor(const vespalib::eval::Value& tensor) = 0;
virtual EntryRef store_encoded_tensor(vespalib::nbostream& encoded) = 0;
virtual std::unique_ptr<vespalib::eval::Value> get_tensor(EntryRef ref) const = 0;
virtual bool encode_stored_tensor(EntryRef ref, vespalib::nbostream& target) const = 0;
// Inherit doc from DataStoreBase
void trimHoldLists(generation_t usedGen) {
_store.trimHoldLists(usedGen);
}
// Inherit doc from DataStoreBase
void transferHoldLists(generation_t generation) {
_store.transferHoldLists(generation);
}
void clearHoldLists() {
_store.clearHoldLists();
}
vespalib::MemoryUsage getMemoryUsage() const {
return _store.getMemoryUsage();
}
vespalib::AddressSpace get_address_space_usage() const {
return _store.getAddressSpaceUsage();
}
bool consider_compact() const noexcept {
return _compaction_spec.compact() && !_store.has_held_buffers();
}
};
}
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