1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_
#define COMPONENTS_METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_
#include <memory>
#include <string>
#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.
std::unique_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 // COMPONENTS_METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_
|
