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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "reference_mappings.h"
#include "reference.h"
#include <vespa/vespalib/datastore/datastore.hpp>
#include <vespa/vespalib/btree/btreestore.hpp>
#include <vespa/vespalib/btree/btreenode.hpp>
#include <vespa/vespalib/util/rcuvector.hpp>
namespace search::attribute {
ReferenceMappings::ReferenceMappings(GenerationHolder& genHolder,
const std::atomic<uint32_t>& committedDocIdLimit,
const vespalib::alloc::Alloc& initial_alloc)
: _reverseMappingIndices(vespalib::GrowStrategy(16, 1.0, 0, 0), genHolder, initial_alloc),
_targetLidLimit(0),
_reverseMapping(),
_targetLids(vespalib::GrowStrategy(16, 1.0, 0, 0), genHolder, initial_alloc),
_committedDocIdLimit(committedDocIdLimit)
{
}
ReferenceMappings::~ReferenceMappings() = default;
void
ReferenceMappings::clearMapping(const Reference &entry)
{
EntryRef revMapIdx = entry.revMapIdx();
if (revMapIdx.valid()) {
_reverseMapping.clear(revMapIdx);
}
}
void
ReferenceMappings::syncForwardMapping(const Reference &entry)
{
uint32_t targetLid = entry.lid();
EntryRef revMapIdx = entry.revMapIdx();
auto &targetLids = _targetLids;
_reverseMapping.foreach_unfrozen_key(revMapIdx,
[&targetLids, targetLid](uint32_t lid)
{ targetLids[lid].store_release(targetLid); });
}
void
ReferenceMappings::syncReverseMappingIndices(const Reference &entry)
{
uint32_t targetLid = entry.lid();
if (targetLid != 0u) {
_reverseMappingIndices.ensure_size(targetLid + 1);
_reverseMappingIndices[targetLid].store_release(entry.revMapIdx());
if (targetLid >= _targetLidLimit.load(std::memory_order_relaxed)) {
_targetLidLimit.store(targetLid + 1, std::memory_order_release);
}
}
}
void
ReferenceMappings::removeReverseMapping(const Reference &entry, uint32_t lid)
{
EntryRef revMapIdx = entry.revMapIdx();
_reverseMapping.apply(revMapIdx, nullptr, nullptr, &lid, &lid + 1);
std::atomic_thread_fence(std::memory_order_release);
entry.setRevMapIdx(revMapIdx);
syncReverseMappingIndices(entry);
_targetLids[lid].store_release(0); // forward mapping
}
void
ReferenceMappings::addReverseMapping(const Reference &entry, uint32_t lid)
{
EntryRef revMapIdx = entry.revMapIdx();
ReverseMapping::KeyDataType add(lid, vespalib::btree::BTreeNoLeafData());
_reverseMapping.apply(revMapIdx, &add, &add + 1, nullptr, nullptr);
std::atomic_thread_fence(std::memory_order_release);
entry.setRevMapIdx(revMapIdx);
syncReverseMappingIndices(entry);
_targetLids[lid].store_release(entry.lid()); // forward mapping
}
void
ReferenceMappings::buildReverseMapping(const Reference &entry, const std::vector<ReverseMapping::KeyDataType> &adds)
{
EntryRef revMapIdx = entry.revMapIdx();
assert(!revMapIdx.valid());
_reverseMapping.apply(revMapIdx, &adds[0], &adds[adds.size()], nullptr, nullptr);
entry.setRevMapIdx(revMapIdx);
}
void
ReferenceMappings::notifyReferencedPut(const Reference &entry, uint32_t targetLid)
{
uint32_t oldTargetLid = entry.lid();
if (oldTargetLid != targetLid) {
if (oldTargetLid != 0u && oldTargetLid < _reverseMappingIndices.size()) {
_reverseMappingIndices[oldTargetLid].store_release(EntryRef());
}
entry.setLid(targetLid);
}
syncReverseMappingIndices(entry);
syncForwardMapping(entry);
}
void
ReferenceMappings::notifyReferencedRemove(const Reference &entry)
{
uint32_t oldTargetLid = entry.lid();
if (oldTargetLid != 0) {
if (oldTargetLid < _reverseMappingIndices.size()) {
_reverseMappingIndices[oldTargetLid].store_release(EntryRef());
}
entry.setLid(0);
}
syncReverseMappingIndices(entry);
syncForwardMapping(entry);
}
void
ReferenceMappings::onAddDocs(uint32_t docIdLimit)
{
_targetLids.reserve(docIdLimit);
}
void
ReferenceMappings::addDoc()
{
_targetLids.push_back(AtomicTargetLid(0));
}
void
ReferenceMappings::onLoad(uint32_t docIdLimit)
{
_targetLids.clear();
_targetLids.unsafe_reserve(docIdLimit);
_targetLids.ensure_size(docIdLimit);
}
void
ReferenceMappings::shrink(uint32_t docIdLimit)
{
_targetLids.shrink(docIdLimit);
}
vespalib::MemoryUsage
ReferenceMappings::getMemoryUsage()
{
vespalib::MemoryUsage usage = _reverseMapping.getMemoryUsage();
usage.merge(_reverseMappingIndices.getMemoryUsage());
usage.merge(_targetLids.getMemoryUsage());
return usage;
}
}
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