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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#include <cassert>
#include "db/blob/blob_garbage_meter.h"
#include "rocksdb/rocksdb_namespace.h"
#include "rocksdb/status.h"
#include "table/internal_iterator.h"
#include "test_util/sync_point.h"
namespace ROCKSDB_NAMESPACE {
// An internal iterator that passes each key-value encountered to
// BlobGarbageMeter as inflow in order to measure the total number and size of
// blobs in the compaction input on a per-blob file basis.
class BlobCountingIterator : public InternalIterator {
public:
BlobCountingIterator(InternalIterator* iter,
BlobGarbageMeter* blob_garbage_meter)
: iter_(iter), blob_garbage_meter_(blob_garbage_meter) {
assert(iter_);
assert(blob_garbage_meter_);
UpdateAndCountBlobIfNeeded();
}
bool Valid() const override { return iter_->Valid() && status_.ok(); }
void SeekToFirst() override {
iter_->SeekToFirst();
UpdateAndCountBlobIfNeeded();
}
void SeekToLast() override {
iter_->SeekToLast();
UpdateAndCountBlobIfNeeded();
}
void Seek(const Slice& target) override {
iter_->Seek(target);
UpdateAndCountBlobIfNeeded();
}
void SeekForPrev(const Slice& target) override {
iter_->SeekForPrev(target);
UpdateAndCountBlobIfNeeded();
}
void Next() override {
assert(Valid());
iter_->Next();
UpdateAndCountBlobIfNeeded();
}
bool NextAndGetResult(IterateResult* result) override {
assert(Valid());
const bool res = iter_->NextAndGetResult(result);
UpdateAndCountBlobIfNeeded();
return res;
}
void Prev() override {
assert(Valid());
iter_->Prev();
UpdateAndCountBlobIfNeeded();
}
Slice key() const override {
assert(Valid());
return iter_->key();
}
Slice user_key() const override {
assert(Valid());
return iter_->user_key();
}
Slice value() const override {
assert(Valid());
return iter_->value();
}
Status status() const override { return status_; }
bool PrepareValue() override {
assert(Valid());
return iter_->PrepareValue();
}
bool MayBeOutOfLowerBound() override {
assert(Valid());
return iter_->MayBeOutOfLowerBound();
}
IterBoundCheck UpperBoundCheckResult() override {
assert(Valid());
return iter_->UpperBoundCheckResult();
}
void SetPinnedItersMgr(PinnedIteratorsManager* pinned_iters_mgr) override {
iter_->SetPinnedItersMgr(pinned_iters_mgr);
}
bool IsKeyPinned() const override {
assert(Valid());
return iter_->IsKeyPinned();
}
bool IsValuePinned() const override {
assert(Valid());
return iter_->IsValuePinned();
}
Status GetProperty(std::string prop_name, std::string* prop) override {
return iter_->GetProperty(prop_name, prop);
}
private:
void UpdateAndCountBlobIfNeeded() {
assert(!iter_->Valid() || iter_->status().ok());
if (!iter_->Valid()) {
status_ = iter_->status();
return;
}
TEST_SYNC_POINT(
"BlobCountingIterator::UpdateAndCountBlobIfNeeded:ProcessInFlow");
status_ = blob_garbage_meter_->ProcessInFlow(key(), value());
}
InternalIterator* iter_;
BlobGarbageMeter* blob_garbage_meter_;
Status status_;
};
} // namespace ROCKSDB_NAMESPACE
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