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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef COMPONENTS_METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_ | 5 #ifndef COMPONENTS_METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_ |
6 #define COMPONENTS_METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_ | 6 #define COMPONENTS_METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_ |
7 | 7 |
8 #include <memory> | 8 #include <memory> |
9 #include <string> | 9 #include <string> |
10 | 10 #include <vector> |
11 #include "base/memory/scoped_vector.h" | |
12 | 11 |
13 namespace metrics { | 12 namespace metrics { |
14 | 13 |
15 class MetricSample; | 14 class MetricSample; |
16 | 15 |
17 // Metrics helpers to serialize and deserialize metrics collected by | 16 // Metrics helpers to serialize and deserialize metrics collected by |
18 // ChromeOS. | 17 // ChromeOS. |
19 namespace SerializationUtils { | 18 namespace SerializationUtils { |
20 | 19 |
21 // Deserializes a sample passed as a string and return a sample. | 20 // Deserializes a sample passed as a string and return a sample. |
22 // The return value will either be a scoped_ptr to a Metric sample (if the | 21 // The return value will either be a scoped_ptr to a Metric sample (if the |
23 // deserialization was successful) or a NULL scoped_ptr. | 22 // deserialization was successful) or a NULL scoped_ptr. |
24 std::unique_ptr<MetricSample> ParseSample(const std::string& sample); | 23 std::unique_ptr<MetricSample> ParseSample(const std::string& sample); |
25 | 24 |
26 // Reads all samples from a file and truncate the file when done. | 25 // Reads all samples from a file and truncate the file when done. |
27 void ReadAndTruncateMetricsFromFile(const std::string& filename, | 26 void ReadAndTruncateMetricsFromFile( |
28 ScopedVector<MetricSample>* metrics); | 27 const std::string& filename, |
| 28 std::vector<std::unique_ptr<MetricSample>>* metrics); |
29 | 29 |
30 // Serializes a sample and write it to filename. | 30 // Serializes a sample and write it to filename. |
31 // The format for the message is: | 31 // The format for the message is: |
32 // message_size, serialized_message | 32 // message_size, serialized_message |
33 // where | 33 // where |
34 // * message_size is the total length of the message (message_size + | 34 // * message_size is the total length of the message (message_size + |
35 // serialized_message) on 4 bytes | 35 // serialized_message) on 4 bytes |
36 // * serialized_message is the serialized version of sample (using ToString) | 36 // * serialized_message is the serialized version of sample (using ToString) |
37 // | 37 // |
38 // NB: the file will never leave the device so message_size will be written | 38 // NB: the file will never leave the device so message_size will be written |
39 // with the architecture's endianness. | 39 // with the architecture's endianness. |
40 bool WriteMetricToFile(const MetricSample& sample, const std::string& filename); | 40 bool WriteMetricToFile(const MetricSample& sample, const std::string& filename); |
41 | 41 |
42 // Maximum length of a serialized message | 42 // Maximum length of a serialized message |
43 static const int kMessageMaxLength = 1024; | 43 static const int kMessageMaxLength = 1024; |
44 | 44 |
45 } // namespace SerializationUtils | 45 } // namespace SerializationUtils |
46 } // namespace metrics | 46 } // namespace metrics |
47 | 47 |
48 #endif // COMPONENTS_METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_ | 48 #endif // COMPONENTS_METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_ |
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