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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/util/arrayref.h>
#include <vespa/vespalib/util/generationhandler.h>
#include <vespa/vespalib/util/memoryusage.h>
#include <cstdint>
#include <cassert>
namespace vespalib::datastore { class CompactionStrategy; }
namespace search::tensor {
class HnswSimpleNode;
/*
* Class used to maintain mapping from docid to nodeid for dense tensors
* (one node per document).
*/
class HnswIdentityMapping {
using generation_t = vespalib::GenerationHandler::generation_t;
uint32_t _nodeid;
public:
HnswIdentityMapping()
: _nodeid(0u)
{
}
vespalib::ConstArrayRef<uint32_t> allocate_ids(uint32_t docid, uint32_t subspaces) {
assert(subspaces == 1u);
_nodeid = docid;
return {&_nodeid, 1};
}
vespalib::ConstArrayRef<uint32_t> get_ids(uint32_t docid) {
_nodeid = docid;
return {&_nodeid, 1};
}
void free_ids(uint32_t docid) { (void) docid; }
void assign_generation(generation_t current_gen) { (void) current_gen; };
void reclaim_memory(generation_t oldest_used_gen) { (void) oldest_used_gen; };
void on_load(vespalib::ConstArrayRef<HnswSimpleNode> nodes) { (void) nodes; }
vespalib::MemoryUsage memory_usage() const { return vespalib::MemoryUsage(); }
vespalib::MemoryUsage update_stat(const vespalib::datastore::CompactionStrategy&) { return vespalib::MemoryUsage(); }
static bool consider_compact() noexcept { return false; }
static void compact_worst(const vespalib::datastore::CompactionStrategy&) {}
};
}
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