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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <type_traits>
#include <unordered_map>
#include "hci/hci_packets.h"
#include "l2cap/cid.h"
#include "os/handler.h"
#include "os/log.h"
namespace bluetooth {
namespace l2cap {
namespace classic {
namespace internal {
class DumpsysHelper;
} // namespace internal
} // namespace classic
namespace internal {
// Helper class for keeping channels in a Link. It allocates and frees Channel object, and supports querying whether a
// channel is in use
template <typename FixedChannelImplType, typename LinkType>
class FixedChannelAllocator {
public:
FixedChannelAllocator(LinkType* link, os::Handler* l2cap_handler) : link_(link), l2cap_handler_(l2cap_handler) {
ASSERT(link_ != nullptr);
ASSERT(l2cap_handler_ != nullptr);
}
virtual ~FixedChannelAllocator() = default;
// Allocates a channel. If cid is used, return nullptr. NOTE: The returned BaseFixedChannelImpl object is still
// owned by the channel allocator, NOT the client.
virtual std::shared_ptr<FixedChannelImplType> AllocateChannel(Cid cid) {
ASSERT_LOG(!IsChannelAllocated((cid)), "Cid 0x%x for link %s is already in use", cid, link_->ToString().c_str());
ASSERT_LOG(cid >= kFirstFixedChannel && cid <= kLastFixedChannel, "Cid %d out of bound", cid);
auto elem = channels_.try_emplace(cid, std::make_shared<FixedChannelImplType>(cid, link_, l2cap_handler_));
ASSERT_LOG(elem.second, "Failed to create channel for cid 0x%x link %s", cid, link_->ToString().c_str());
ASSERT(elem.first->second != nullptr);
return elem.first->second;
}
// Frees a channel. If cid doesn't exist, it will crash
virtual void FreeChannel(Cid cid) {
ASSERT_LOG(IsChannelAllocated(cid), "Channel is not in use: cid %d, link %s", cid, link_->ToString().c_str());
channels_.erase(cid);
}
virtual bool IsChannelAllocated(Cid cid) const {
return channels_.find(cid) != channels_.end();
}
virtual std::shared_ptr<FixedChannelImplType> FindChannel(Cid cid) {
ASSERT_LOG(IsChannelAllocated(cid), "Channel is not in use: cid %d, link %s", cid, link_->ToString().c_str());
return channels_.find(cid)->second;
}
virtual size_t NumberOfChannels() const {
return channels_.size();
}
virtual void OnAclDisconnected(hci::ErrorCode hci_status) {
for (auto& elem : channels_) {
elem.second->OnClosed(hci_status);
}
}
virtual int GetRefCount() {
int ref_count = 0;
for (auto& elem : channels_) {
if (elem.second->IsAcquired()) {
ref_count++;
}
}
return ref_count;
}
private:
friend class bluetooth::l2cap::classic::internal::DumpsysHelper;
LinkType* link_;
os::Handler* l2cap_handler_;
std::unordered_map<Cid, std::shared_ptr<FixedChannelImplType>> channels_;
};
} // namespace internal
} // namespace l2cap
} // namespace bluetooth
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