95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
/*
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* Copyright 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <atomic>
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#include <string>
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#include <unordered_map>
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#include "common/bidi_queue.h"
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#include "common/bind.h"
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#include "data_controller.h"
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#include "l2cap/cid.h"
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#include "l2cap/classic/internal/channel_configuration_state.h"
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#include "l2cap/internal/channel_impl.h"
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#include "l2cap/internal/data_controller.h"
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#include "l2cap/l2cap_packets.h"
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#include "l2cap/mtu.h"
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#include "os/handler.h"
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#include "os/queue.h"
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#include "packet/base_packet_builder.h"
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#include "packet/packet_view.h"
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namespace bluetooth {
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namespace l2cap {
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namespace internal {
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class Scheduler;
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class ILink;
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/**
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* A middle layer between L2CAP channel and outgoing packet scheduler.
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* Fetches data (SDU) from an L2CAP channel queue end, handles L2CAP segmentation, and gives data to L2CAP scheduler.
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*/
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class Sender {
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public:
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using UpperEnqueue = packet::PacketView<packet::kLittleEndian>;
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using UpperDequeue = packet::BasePacketBuilder;
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using UpperQueueDownEnd = common::BidiQueueEnd<UpperEnqueue, UpperDequeue>;
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enum class ChannelMode {
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BASIC = 0,
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ERTM = 3,
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LE_CREDIT_BASED = 10,
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};
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Sender(os::Handler* handler, ILink* link, Scheduler* scheduler, std::shared_ptr<ChannelImpl> channel);
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Sender(os::Handler* handler, ILink* link, Scheduler* scheduler, std::shared_ptr<ChannelImpl> channel,
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ChannelMode mode);
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~Sender();
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/**
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* Callback from scheduler to indicate that scheduler already dequeued a packet from sender's queue.
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* Segmenter can continue dequeuing from channel queue end.
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*/
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void OnPacketSent();
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/**
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* Called by the scheduler to return the next PDU to be sent
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*/
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std::unique_ptr<UpperDequeue> GetNextPacket();
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void UpdateClassicConfiguration(classic::internal::ChannelConfigurationState config);
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DataController* GetDataController();
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private:
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os::Handler* handler_;
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ILink* link_;
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UpperQueueDownEnd* queue_end_;
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Scheduler* scheduler_;
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const Cid channel_id_;
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const Cid remote_channel_id_;
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std::atomic_bool is_dequeue_registered_ = false;
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RetransmissionAndFlowControlModeOption mode_ = RetransmissionAndFlowControlModeOption::L2CAP_BASIC;
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std::unique_ptr<DataController> data_controller_;
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void try_register_dequeue();
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void dequeue_callback();
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};
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} // namespace internal
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} // namespace l2cap
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} // namespace bluetooth
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