1/*
2 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include "webrtc/common.h"
12#include "webrtc/voice_engine/channel_manager.h"
13
14#include "webrtc/voice_engine/channel.h"
15
16namespace webrtc {
17namespace voe {
18
19ChannelOwner::ChannelOwner(class Channel* channel)
20    : channel_ref_(new ChannelRef(channel)) {}
21
22ChannelOwner::ChannelOwner(const ChannelOwner& channel_owner)
23    : channel_ref_(channel_owner.channel_ref_) {
24  ++channel_ref_->ref_count;
25}
26
27ChannelOwner::~ChannelOwner() {
28  if (--channel_ref_->ref_count == 0)
29    delete channel_ref_;
30}
31
32ChannelOwner& ChannelOwner::operator=(const ChannelOwner& other) {
33  if (other.channel_ref_ == channel_ref_)
34    return *this;
35
36  if (--channel_ref_->ref_count == 0)
37    delete channel_ref_;
38
39  channel_ref_ = other.channel_ref_;
40  ++channel_ref_->ref_count;
41
42  return *this;
43}
44
45ChannelOwner::ChannelRef::ChannelRef(class Channel* channel)
46    : channel(channel), ref_count(1) {}
47
48ChannelManager::ChannelManager(uint32_t instance_id, const Config& config)
49    : instance_id_(instance_id),
50      last_channel_id_(-1),
51      lock_(CriticalSectionWrapper::CreateCriticalSection()),
52      config_(config) {}
53
54ChannelOwner ChannelManager::CreateChannel() {
55  return CreateChannelInternal(config_);
56}
57
58ChannelOwner ChannelManager::CreateChannel(const Config& external_config) {
59  return CreateChannelInternal(external_config);
60}
61
62ChannelOwner ChannelManager::CreateChannelInternal(const Config& config) {
63  Channel* channel;
64  Channel::CreateChannel(channel, ++last_channel_id_, instance_id_, config);
65  ChannelOwner channel_owner(channel);
66
67  CriticalSectionScoped crit(lock_.get());
68
69  channels_.push_back(channel_owner);
70
71  return channel_owner;
72}
73
74ChannelOwner ChannelManager::GetChannel(int32_t channel_id) {
75  CriticalSectionScoped crit(lock_.get());
76
77  for (size_t i = 0; i < channels_.size(); ++i) {
78    if (channels_[i].channel()->ChannelId() == channel_id)
79      return channels_[i];
80  }
81  return ChannelOwner(NULL);
82}
83
84void ChannelManager::GetAllChannels(std::vector<ChannelOwner>* channels) {
85  CriticalSectionScoped crit(lock_.get());
86
87  *channels = channels_;
88}
89
90void ChannelManager::DestroyChannel(int32_t channel_id) {
91  assert(channel_id >= 0);
92  // Holds a reference to a channel, this is used so that we never delete
93  // Channels while holding a lock, but rather when the method returns.
94  ChannelOwner reference(NULL);
95  {
96    CriticalSectionScoped crit(lock_.get());
97
98    for (std::vector<ChannelOwner>::iterator it = channels_.begin();
99         it != channels_.end();
100         ++it) {
101      if (it->channel()->ChannelId() == channel_id) {
102        reference = *it;
103        channels_.erase(it);
104        break;
105      }
106    }
107  }
108}
109
110void ChannelManager::DestroyAllChannels() {
111  // Holds references so that Channels are not destroyed while holding this
112  // lock, but rather when the method returns.
113  std::vector<ChannelOwner> references;
114  {
115    CriticalSectionScoped crit(lock_.get());
116    references = channels_;
117    channels_.clear();
118  }
119}
120
121size_t ChannelManager::NumOfChannels() const {
122  CriticalSectionScoped crit(lock_.get());
123  return channels_.size();
124}
125
126ChannelManager::Iterator::Iterator(ChannelManager* channel_manager)
127    : iterator_pos_(0) {
128  channel_manager->GetAllChannels(&channels_);
129}
130
131Channel* ChannelManager::Iterator::GetChannel() {
132  if (iterator_pos_ < channels_.size())
133    return channels_[iterator_pos_].channel();
134  return NULL;
135}
136
137bool ChannelManager::Iterator::IsValid() {
138  return iterator_pos_ < channels_.size();
139}
140
141void ChannelManager::Iterator::Increment() {
142  ++iterator_pos_;
143}
144
145}  // namespace voe
146}  // namespace webrtc
147