components/proximity_auth/bluetooth_throttler_impl.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/bluetooth_throttler_impl.h"
   6
   7 #include "base/stl_util.h"
   8 #include "base/time/tick_clock.h"
   9 #include "components/proximity_auth/connection.h"
  10
  11 namespace proximity_auth {
  12 namespace {
  13
  14 // Time to wait after disconnect before reconnecting.
  15 const int kCooldownTimeSecs = 7;
  16
  17 }  // namespace
  18
  19 BluetoothThrottlerImpl::BluetoothThrottlerImpl(
  20     scoped_ptr<base::TickClock> clock)
  21     : clock_(clock.Pass()) {
  22 }
  23
  24 BluetoothThrottlerImpl::~BluetoothThrottlerImpl() {
  25   for (Connection* connection : connections_) {
  26     connection->RemoveObserver(this);
  27   }
  28 }
  29
  30 base::TimeDelta BluetoothThrottlerImpl::GetDelay() const {
  31   if (last_disconnect_time_.is_null())
  32     return base::TimeDelta();
  33
  34   base::TimeTicks now = clock_->NowTicks();
  35   base::TimeTicks throttled_start_time =
  36       last_disconnect_time_ + GetCooldownTimeDelta();
  37   if (now >= throttled_start_time)
  38     return base::TimeDelta();
  39
  40   return throttled_start_time - now;
  41 }
  42
  43 void BluetoothThrottlerImpl::OnConnection(Connection* connection) {
  44   DCHECK(!ContainsKey(connections_, connection));
  45   connections_.insert(connection);
  46   connection->AddObserver(this);
  47 }
  48
  49 base::TimeDelta BluetoothThrottlerImpl::GetCooldownTimeDelta() const {
  50   return base::TimeDelta::FromSeconds(kCooldownTimeSecs);
  51 }
  52
  53 void BluetoothThrottlerImpl::OnConnectionStatusChanged(
  54     Connection* connection,
  55     Connection::Status old_status,
  56     Connection::Status new_status) {
  57   DCHECK(ContainsKey(connections_, connection));
  58   if (old_status == Connection::CONNECTED &&
  59       new_status == Connection::DISCONNECTED) {
  60     last_disconnect_time_ = clock_->NowTicks();
  61     connection->RemoveObserver(this);
  62     connections_.erase(connection);
  63   }
  64 }
  65
  66 }  // namespace proximity_auth