fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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49 lines
1.9 KiB
49 lines
1.9 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "monitoring/in_memory_stats_history.h"
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#include "db/db_impl/db_impl.h"
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namespace ROCKSDB_NAMESPACE {
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InMemoryStatsHistoryIterator::~InMemoryStatsHistoryIterator() {}
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bool InMemoryStatsHistoryIterator::Valid() const { return valid_; }
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Status InMemoryStatsHistoryIterator::status() const { return status_; }
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// Because of garbage collection, the next stats snapshot may or may not be
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// right after the current one. When reading from DBImpl::stats_history_, this
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// call will be protected by DB Mutex so it will not return partial or
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// corrupted results.
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void InMemoryStatsHistoryIterator::Next() {
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// increment start_time by 1 to avoid infinite loop
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AdvanceIteratorByTime(GetStatsTime() + 1, end_time_);
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}
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uint64_t InMemoryStatsHistoryIterator::GetStatsTime() const { return time_; }
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const std::map<std::string, uint64_t>&
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InMemoryStatsHistoryIterator::GetStatsMap() const {
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return stats_map_;
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}
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// advance the iterator to the next time between [start_time, end_time)
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// if success, update time_ and stats_map_ with new_time and stats_map
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void InMemoryStatsHistoryIterator::AdvanceIteratorByTime(uint64_t start_time,
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uint64_t end_time) {
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// try to find next entry in stats_history_ map
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if (db_impl_ != nullptr) {
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valid_ =
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db_impl_->FindStatsByTime(start_time, end_time, &time_, &stats_map_);
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} else {
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valid_ = false;
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}
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}
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} // namespace ROCKSDB_NAMESPACE
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