1 /* 2 * Copyright 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <type_traits> 20 #include <unordered_map> 21 22 #include "hci/hci_packets.h" 23 #include "l2cap/cid.h" 24 #include "os/handler.h" 25 #include "os/log.h" 26 27 namespace bluetooth { 28 namespace l2cap { 29 30 namespace classic { 31 namespace internal { 32 class DumpsysHelper; 33 } // namespace internal 34 } // namespace classic 35 36 namespace internal { 37 38 // Helper class for keeping channels in a Link. It allocates and frees Channel object, and supports querying whether a 39 // channel is in use 40 template <typename FixedChannelImplType, typename LinkType> 41 class FixedChannelAllocator { 42 public: FixedChannelAllocator(LinkType * link,os::Handler * l2cap_handler)43 FixedChannelAllocator(LinkType* link, os::Handler* l2cap_handler) : link_(link), l2cap_handler_(l2cap_handler) { 44 ASSERT(link_ != nullptr); 45 ASSERT(l2cap_handler_ != nullptr); 46 } 47 48 virtual ~FixedChannelAllocator() = default; 49 50 // Allocates a channel. If cid is used, return nullptr. NOTE: The returned BaseFixedChannelImpl object is still 51 // owned by the channel allocator, NOT the client. AllocateChannel(Cid cid)52 virtual std::shared_ptr<FixedChannelImplType> AllocateChannel(Cid cid) { 53 ASSERT_LOG(!IsChannelAllocated((cid)), "Cid 0x%x for link %s is already in use", cid, link_->ToString().c_str()); 54 ASSERT_LOG(cid >= kFirstFixedChannel && cid <= kLastFixedChannel, "Cid %d out of bound", cid); 55 auto elem = channels_.try_emplace(cid, std::make_shared<FixedChannelImplType>(cid, link_, l2cap_handler_)); 56 ASSERT_LOG(elem.second, "Failed to create channel for cid 0x%x link %s", cid, link_->ToString().c_str()); 57 ASSERT(elem.first->second != nullptr); 58 return elem.first->second; 59 } 60 61 // Frees a channel. If cid doesn't exist, it will crash FreeChannel(Cid cid)62 virtual void FreeChannel(Cid cid) { 63 ASSERT_LOG(IsChannelAllocated(cid), "Channel is not in use: cid %d, link %s", cid, link_->ToString().c_str()); 64 channels_.erase(cid); 65 } 66 IsChannelAllocated(Cid cid)67 virtual bool IsChannelAllocated(Cid cid) const { 68 return channels_.find(cid) != channels_.end(); 69 } 70 FindChannel(Cid cid)71 virtual std::shared_ptr<FixedChannelImplType> FindChannel(Cid cid) { 72 ASSERT_LOG(IsChannelAllocated(cid), "Channel is not in use: cid %d, link %s", cid, link_->ToString().c_str()); 73 return channels_.find(cid)->second; 74 } 75 NumberOfChannels()76 virtual size_t NumberOfChannels() const { 77 return channels_.size(); 78 } 79 OnAclDisconnected(hci::ErrorCode hci_status)80 virtual void OnAclDisconnected(hci::ErrorCode hci_status) { 81 for (auto& elem : channels_) { 82 elem.second->OnClosed(hci_status); 83 } 84 } 85 GetRefCount()86 virtual int GetRefCount() { 87 int ref_count = 0; 88 for (auto& elem : channels_) { 89 if (elem.second->IsAcquired()) { 90 ref_count++; 91 } 92 } 93 return ref_count; 94 } 95 96 private: 97 friend class bluetooth::l2cap::classic::internal::DumpsysHelper; 98 LinkType* link_; 99 os::Handler* l2cap_handler_; 100 std::unordered_map<Cid, std::shared_ptr<FixedChannelImplType>> channels_; 101 }; 102 103 } // namespace internal 104 } // namespace l2cap 105 } // namespace bluetooth 106