1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef LIBTEXTCLASSIFIER_COMMON_MEMORY_IMAGE_DATA_STORE_H_ 18 #define LIBTEXTCLASSIFIER_COMMON_MEMORY_IMAGE_DATA_STORE_H_ 19 20 #include <string> 21 22 #include "common/memory_image/data-store.pb.h" 23 #include "common/memory_image/memory-image-common.h" 24 #include "common/memory_image/memory-image-reader.h" 25 #include "util/strings/stringpiece.h" 26 27 namespace libtextclassifier { 28 namespace nlp_core { 29 namespace memory_image { 30 31 // Class to access a data store. See usage example in comments for 32 // DataStoreBuilder. 33 class DataStore { 34 public: 35 // Constructs a DataStore using the indicated bytes, i.e., bytes.size() bytes 36 // starting at address bytes.data(). These bytes should contain the 37 // serialization of a data store, see DataStoreBuilder::SerializeAsString(). 38 explicit DataStore(StringPiece bytes); 39 40 // Retrieves (start_addr, num_bytes) info for piece of memory that contains 41 // the data associated with the indicated name. Note: this piece of memory is 42 // inside the [start, start + size) (see constructor). This piece of memory 43 // starts at an offset from start which is a multiple of the alignment 44 // specified when the data store was built using DataStoreBuilder. 45 // 46 // If the alignment is a low power of 2 (e..g, 4, 8, or 16) and "start" passed 47 // to constructor corresponds to the beginning of a memory page or an address 48 // returned by new or malloc(), then start_addr is divisible with alignment. 49 DataBlobView GetData(const std::string &name) const; 50 51 private: 52 MemoryImageReader<DataStoreProto> reader_; 53 }; 54 55 } // namespace memory_image 56 } // namespace nlp_core 57 } // namespace libtextclassifier 58 59 #endif // LIBTEXTCLASSIFIER_COMMON_MEMORY_IMAGE_DATA_STORE_H_ 60
