components/proximity_auth/logging/log_buffer.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/proximity_auth/logging/log_buffer.h"
   6
   7 #include "base/lazy_instance.h"
   8
   9 namespace proximity_auth {
  10
  11 namespace {
  12
  13 // The maximum number of logs that can be stored in the buffer.
  14 const size_t kMaxBufferSize = 1000;
  15
  16 // The global instance returned by LogBuffer::GetInstance().
  17 base::LazyInstance<LogBuffer>::Leaky g_log_buffer = LAZY_INSTANCE_INITIALIZER;
  18
  19 }  // namespace
  20
  21 LogBuffer::LogMessage::LogMessage(const std::string& text,
  22                                   const base::Time& time,
  23                                   const std::string& file,
  24                                   const int line,
  25                                   logging::LogSeverity severity)
  26     : text(text), time(time), file(file), line(line), severity(severity) {
  27 }
  28
  29 LogBuffer::LogBuffer() {
  30 }
  31
  32 LogBuffer::~LogBuffer() {
  33 }
  34
  35 // static
  36 LogBuffer* LogBuffer::GetInstance() {
  37   return &g_log_buffer.Get();
  38 }
  39
  40 void LogBuffer::AddObserver(Observer* observer) {
  41   observers_.AddObserver(observer);
  42 }
  43
  44 void LogBuffer::RemoveObserver(Observer* observer) {
  45   observers_.RemoveObserver(observer);
  46 }
  47
  48 void LogBuffer::AddLogMessage(const LogMessage& log_message) {
  49   // Note: We may want to sort the messages by timestamp if there are cases
  50   // where logs are not added chronologically.
  51   log_messages_.push_back(log_message);
  52   if (log_messages_.size() > MaxBufferSize())
  53     log_messages_.pop_front();
  54   FOR_EACH_OBSERVER(Observer, observers_, OnLogMessageAdded(log_message));
  55 }
  56
  57 void LogBuffer::Clear() {
  58   log_messages_.clear();
  59   FOR_EACH_OBSERVER(Observer, observers_, OnLogBufferCleared());
  60 }
  61
  62 size_t LogBuffer::MaxBufferSize() const {
  63   return kMaxBufferSize;
  64 }
  65
  66 }  // proximity_auth