| /************************************************************ |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| #include "singa/io/kvfile_store.h" |
| |
| #include <glog/logging.h> |
| |
| namespace singa { |
| namespace io { |
| |
| bool KVFileStore::Open(const std::string& source, Mode mode) { |
| CHECK(file_ == nullptr); |
| if (mode == kRead) |
| file_ = new KVFile(source, KVFile::kRead); |
| else if (mode == kCreate) |
| file_ = new KVFile(source, KVFile::kCreate); |
| else if (mode == kAppend) |
| file_ = new KVFile(source, KVFile::kAppend); |
| mode_ = mode; |
| return file_ != nullptr; |
| } |
| |
| void KVFileStore::Close() { |
| if (file_ != nullptr) |
| delete file_; |
| file_ = nullptr; |
| } |
| |
| bool KVFileStore::Read(std::string* key, std::string* value) { |
| CHECK_EQ(mode_, kRead); |
| CHECK(file_ != nullptr); |
| return file_->Next(key, value); |
| } |
| |
| void KVFileStore::SeekToFirst() { |
| CHECK_EQ(mode_, kRead); |
| CHECK(file_ != nullptr); |
| file_->SeekToFirst(); |
| } |
| |
| void KVFileStore::Seek(int offset) { |
| LOG(FATAL) << "Operation not supported."; |
| } |
| |
| bool KVFileStore::Write(const std::string& key, const std::string& value) { |
| CHECK_NE(mode_, kRead); |
| CHECK(file_ != nullptr); |
| return file_->Insert(key, value); |
| } |
| |
| void KVFileStore::Flush() { |
| CHECK_NE(mode_, kRead); |
| CHECK(file_!= nullptr); |
| file_->Flush(); |
| } |
| |
| } // namespace io |
| } // namespace singa |