blob: 568d8ec134fcf35da7452acbc762d0fea3a745c7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
// 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).
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "monitoring/in_memory_stats_history.h"
#include "db/db_impl/db_impl.h"
namespace ROCKSDB_NAMESPACE {
InMemoryStatsHistoryIterator::~InMemoryStatsHistoryIterator() {}
bool InMemoryStatsHistoryIterator::Valid() const { return valid_; }
Status InMemoryStatsHistoryIterator::status() const { return status_; }
// Because of garbage collection, the next stats snapshot may or may not be
// right after the current one. When reading from DBImpl::stats_history_, this
// call will be protected by DB Mutex so it will not return partial or
// corrupted results.
void InMemoryStatsHistoryIterator::Next() {
// increment start_time by 1 to avoid infinite loop
AdvanceIteratorByTime(GetStatsTime() + 1, end_time_);
}
uint64_t InMemoryStatsHistoryIterator::GetStatsTime() const { return time_; }
const std::map<std::string, uint64_t>&
InMemoryStatsHistoryIterator::GetStatsMap() const {
return stats_map_;
}
// advance the iterator to the next time between [start_time, end_time)
// if success, update time_ and stats_map_ with new_time and stats_map
void InMemoryStatsHistoryIterator::AdvanceIteratorByTime(uint64_t start_time,
uint64_t end_time) {
// try to find next entry in stats_history_ map
if (db_impl_ != nullptr) {
valid_ =
db_impl_->FindStatsByTime(start_time, end_time, &time_, &stats_map_);
} else {
valid_ = false;
}
}
} // namespace ROCKSDB_NAMESPACE
|
