1 files changed, 122 insertions, 0 deletions
diff --git a/libtransport/includes/hicn/transport/core/global_object_pool.h b/libtransport/includes/hicn/transport/core/global_object_pool.h
new file mode 100644
index 000000000..e0b6e373f
--- /dev/null
+++ b/libtransport/includes/hicn/transport/core/global_object_pool.h
@@ -0,0 +1,122 @@
+/*
+ * 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