Add basic network classes and message pooling

Source/Engine/Networking/NetworkManager.cpp

@@ -0,0 +1,135 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#include "NetworkManager.h"
+
+#include "NetworkMessage.h"
+#include "NetworkConfig.h"
+#include "INetworkDriver.h"
+
+#include "Engine/Core/Core.h"
+#include "Engine/Core/Collections/Array.h"
+#include "Engine/Core/Math/Math.h"
+#include "Engine/Platform/CPUInfo.h"
+
+namespace
+{
+    NetworkConfig Config;
+    INetworkDriver* NetworkDriver = nullptr;
+
+    uint8* MessageBuffer = nullptr;
+    Array<uint32, HeapAllocation> MessagePool;
+}
+
+bool NetworkManager::Initialize(const NetworkConfig& config)
+{
+    Config = config;
+    
+    ASSERT(NetworkDriver == nullptr);
+    ASSERT(Config.NetworkDriver);
+    ASSERT(Config.ConnectionsLimit > 0);
+    ASSERT(Config.MessageSize > 32); // TODO: Adjust this, not sure what the lowest limit should be.
+    ASSERT(Config.MessagePoolSize > 128);
+
+    // Setup messages
+    CreateMessageBuffers();
+    MessagePool.Clear();
+    MessagePool.Resize(Config.MessagePoolSize);
+
+    // Warmup message pool
+    for(uint32 messageId = Config.MessagePoolSize; messageId > 0; messageId --)
+        MessagePool.Push(messageId);
+
+    // Setup network driver
+    NetworkDriver = Config.NetworkDriver;
+    NetworkDriver->Initialize(Config);
+    
+    return false;
+}
+
+void NetworkManager::Shutdown()
+{
+    SAFE_DISPOSE(NetworkDriver);
+    DisposeMessageBuffers();
+}
+
+bool NetworkManager::Listen()
+{
+    // TODO
+    return false;
+}
+
+void NetworkManager::Connect()
+{
+    // TODO
+}
+
+void NetworkManager::Disconnect()
+{
+    // TODO
+}
+
+NetworkMessage NetworkManager::BeginSendMessage()
+{
+    return CreateMessage();
+}
+
+void NetworkManager::AbortSendMessage(const NetworkMessage& message)
+{
+    ASSERT(message.IsValid());
+    RecycleMessage(message);
+}
+
+bool NetworkManager::EndSendMessage(NetworkChannelType channelType, const NetworkMessage& message, Array<NetworkConnection> targets)
+{
+    ASSERT(message.IsValid());
+    
+    // TODO: Send message
+
+    RecycleMessage(message);
+    return false;
+}
+
+NetworkMessage NetworkManager::CreateMessage()
+{
+    ASSERT(MessagePool.Count() > 0);
+
+    const uint32 messageId = MessagePool.Pop();
+    uint8* messageBuffer = GetMessageBuffer(messageId);
+
+    return NetworkMessage { messageBuffer, Config.MessageSize, 0, 0 };
+}
+
+void NetworkManager::RecycleMessage(const NetworkMessage& message)
+{
+    ASSERT(message.IsValid());
+}
+
+void NetworkManager::CreateMessageBuffers()
+{
+    ASSERT(MessageBuffer == nullptr);
+    
+    const uint32 pageSize = Platform::GetCPUInfo().PageSize;
+
+    // Calculate total size in bytes
+    const uint64 totalSize = static_cast<uint64>(Config.MessagePoolSize) * Config.MessageSize;
+
+    // Calculate the amount of pages that we need
+    const uint32 numPages = totalSize > pageSize ? Math::CeilToInt(totalSize / static_cast<double>(pageSize)) : 1;
+
+    MessageBuffer = static_cast<uint8*>(Platform::AllocatePages(numPages, pageSize));
+    Platform::MemorySet(MessageBuffer, 0, numPages * pageSize);
+}
+
+void NetworkManager::DisposeMessageBuffers()
+{
+    ASSERT(MessageBuffer != nullptr);
+    
+    Platform::FreePages(MessageBuffer);
+    MessageBuffer = nullptr;
+}
+
+uint8* NetworkManager::GetMessageBuffer(const uint32 messageId)
+{
+    // Calculate and return the buffer slice using previously calculated slice.
+    return MessageBuffer + Config.MessageSize * messageId;
+}