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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 "common/bidi_queue.h"
#include "l2cap/cid.h"
#include "l2cap/l2cap_packets.h"
#include "packet/base_packet_builder.h"
#include "packet/packet_view.h"
namespace bluetooth {
namespace l2cap {
namespace internal {
/**
* Handle the scheduling of packets through the l2cap stack.
* For each attached channel, dequeue its outgoing packets and enqueue it to the given LinkQueueUpEnd, according to some
* policy (cid). Dequeue incoming packets from LinkQueueUpEnd, and enqueue it to ChannelQueueDownEnd. Note: If a channel
* cannot dequeue from ChannelQueueDownEnd so that the buffer for incoming packet is full, further incoming packets will
* be dropped.
*/
class Scheduler {
public:
using UpperEnqueue = packet::PacketView<packet::kLittleEndian>;
using UpperDequeue = packet::BasePacketBuilder;
using UpperQueueDownEnd = common::BidiQueueEnd<UpperEnqueue, UpperDequeue>;
using LowerEnqueue = UpperDequeue;
using LowerDequeue = UpperEnqueue;
using LowerQueueUpEnd = common::BidiQueueEnd<LowerEnqueue, LowerDequeue>;
using DemuxPolicy = common::Callback<Cid(const UpperEnqueue&)>;
/**
* Attach the channel with the specified ChannelQueueDownEnd into the scheduler.
*
* @param cid The channel to attach to the scheduler.
* @param channel_down_end The ChannelQueueDownEnd associated with the channel to attach to the scheduler.
* @param remote_cid The destination endpoint of the packet.
*/
virtual void AttachChannel(Cid cid, UpperQueueDownEnd* channel_down_end, Cid remote_cid) {}
/**
* Detach the channel from the scheduler.
*
* @param cid The channel to detach to the scheduler.
*/
virtual void DetachChannel(Cid cid) {}
/**
* Return the lower queue up end, which can be used to enqueue or dequeue.
*/
virtual LowerQueueUpEnd* GetLowerQueueUpEnd() const = 0;
virtual ~Scheduler() = default;
};
} // namespace internal
} // namespace l2cap
} // namespace bluetooth
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