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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* 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 <hicn/transport/core/packet.h>
#include <hicn/transport/utils/fixed_block_allocator.h>
#include <hicn/transport/utils/singleton.h>
#include <array>
#include <mutex>
namespace transport {
namespace core {
template <std::size_t packet_pool_size = 1024, std::size_t chunk_size = 2048>
class PacketManager
: public utils::Singleton<PacketManager<packet_pool_size, chunk_size>> {
friend class utils::Singleton<PacketManager<packet_pool_size, chunk_size>>;
public:
using MemoryPool = utils::FixedBlockAllocator<chunk_size, packet_pool_size>;
using RawBuffer = std::pair<uint8_t *, std::size_t>;
struct PacketStorage {
std::array<uint8_t, 256> packet_and_shared_ptr;
std::max_align_t align;
};
utils::MemBuf::Ptr getMemBuf() {
utils::MemBuf *memory = nullptr;
memory = reinterpret_cast<utils::MemBuf *>(memory_pool_.allocateBlock());
utils::STLAllocator<utils::MemBuf, MemoryPool> allocator(memory,
&memory_pool_);
auto offset = offsetof(PacketStorage, align);
auto ret = std::allocate_shared<utils::MemBuf>(
allocator, utils::MemBuf::WRAP_BUFFER, (uint8_t *)memory + offset, 0,
chunk_size - offset);
ret->clear();
return ret;
}
utils::MemBuf::Ptr getMemBuf(uint8_t *buffer, std::size_t length) {
auto offset = offsetof(PacketStorage, align);
auto memory = buffer - offset;
utils::STLAllocator<utils::MemBuf, MemoryPool> allocator(
(utils::MemBuf *)memory, &memory_pool_);
auto ret = std::allocate_shared<utils::MemBuf>(
allocator, utils::MemBuf::WRAP_BUFFER, (uint8_t *)buffer, length,
chunk_size - offset);
return ret;
}
template <
typename PacketType, typename... Args,
typename = std::enable_if_t<std::is_base_of<Packet, PacketType>::value>>
typename PacketType::Ptr getPacket(Args &&...args) {
PacketType *memory = nullptr;
memory = reinterpret_cast<PacketType *>(memory_pool_.allocateBlock());
utils::STLAllocator<PacketType, MemoryPool> allocator(memory,
&memory_pool_);
auto offset = offsetof(PacketStorage, align);
auto ret = std::allocate_shared<PacketType>(
allocator, PacketType::CREATE, (uint8_t *)memory + offset, 0,
chunk_size - offset, std::forward<Args>(args)...);
return ret;
}
std::pair<uint8_t *, std::size_t> getRawBuffer() {
uint8_t *memory = nullptr;
memory = reinterpret_cast<uint8_t *>(memory_pool_.allocateBlock());
auto offset = offsetof(PacketStorage, align);
memory += offset;
return std::make_pair(memory, chunk_size - offset);
}
template <typename PacketType, typename... Args>
typename PacketType::Ptr getPacketFromExistingBuffer(uint8_t *buffer,
std::size_t length,
Args &&...args) {
auto offset = offsetof(PacketStorage, align);
auto memory = reinterpret_cast<PacketType *>(buffer - offset);
utils::STLAllocator<PacketType, MemoryPool> allocator(memory,
&memory_pool_);
auto ret = std::allocate_shared<PacketType>(
allocator, PacketType::WRAP_BUFFER, (uint8_t *)buffer, length,
chunk_size - offset, std::forward<Args>(args)...);
return ret;
}
private:
PacketManager(std::size_t size = packet_pool_size)
: memory_pool_(MemoryPool::getInstance()), size_(0) {}
MemoryPool &memory_pool_;
std::atomic<size_t> size_;
};
} // end namespace core
} // end namespace transport
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