initial commit

tddb/td/db/MemoryKeyValue.cpp

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#include "td/db/MemoryKeyValue.h"
+
+#include "td/utils/format.h"
+
+namespace td {
+Result<MemoryKeyValue::GetStatus> MemoryKeyValue::get(Slice key, std::string &value) {
+  auto it = map_.find(key);
+  if (it == map_.end()) {
+    return GetStatus::NotFound;
+  }
+  value = it->second;
+  return GetStatus::Ok;
+}
+Status MemoryKeyValue::set(Slice key, Slice value) {
+  map_[key.str()] = value.str();
+  return Status::OK();
+}
+Status MemoryKeyValue::erase(Slice key) {
+  auto it = map_.find(key);
+  if (it != map_.end()) {
+    map_.erase(it);
+  }
+  return Status::OK();
+}
+
+Result<size_t> MemoryKeyValue::count(Slice prefix) {
+  size_t res = 0;
+  for (auto it = map_.lower_bound(prefix); it != map_.end(); it++) {
+    if (Slice(it->first).truncate(prefix.size()) != prefix) {
+      break;
+    }
+    res++;
+  }
+  return res;
+}
+
+std::unique_ptr<KeyValueReader> MemoryKeyValue::snapshot() {
+  auto res = std::make_unique<MemoryKeyValue>();
+  res->map_ = map_;
+  return std::move(res);
+}
+
+std::string MemoryKeyValue::stats() const {
+  return PSTRING() << "MemoryKeyValueStats{" << tag("get_count", get_count_) << "}";
+}
+
+Status MemoryKeyValue::begin_transaction() {
+  UNREACHABLE();
+}
+Status MemoryKeyValue::commit_transaction() {
+  UNREACHABLE();
+}
+Status MemoryKeyValue::abort_transaction() {
+  UNREACHABLE();
+}
+}  // namespace td