| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed 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. |
| */ |
| |
| #ifndef METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_ |
| #define METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_ |
| |
| #include <string> |
| |
| #include "base/memory/scoped_ptr.h" |
| #include "base/memory/scoped_vector.h" |
| |
| namespace metrics { |
| |
| class MetricSample; |
| |
| // Metrics helpers to serialize and deserialize metrics collected by |
| // ChromeOS. |
| namespace SerializationUtils { |
| |
| // Deserializes a sample passed as a string and return a sample. |
| // The return value will either be a scoped_ptr to a Metric sample (if the |
| // deserialization was successful) or a NULL scoped_ptr. |
| scoped_ptr<MetricSample> ParseSample(const std::string& sample); |
| |
| // Reads all samples from a file and truncate the file when done. |
| void ReadAndTruncateMetricsFromFile(const std::string& filename, |
| ScopedVector<MetricSample>* metrics); |
| |
| // Serializes a sample and write it to filename. |
| // The format for the message is: |
| // message_size, serialized_message |
| // where |
| // * message_size is the total length of the message (message_size + |
| // serialized_message) on 4 bytes |
| // * serialized_message is the serialized version of sample (using ToString) |
| // |
| // NB: the file will never leave the device so message_size will be written |
| // with the architecture's endianness. |
| bool WriteMetricToFile(const MetricSample& sample, const std::string& filename); |
| |
| // Maximum length of a serialized message |
| static const int kMessageMaxLength = 1024; |
| |
| } // namespace SerializationUtils |
| } // namespace metrics |
| |
| #endif // METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_ |