从零开始实现一个C++高性能服务器框架----序列化模块

详细内容：日志模块，使用宏实现流式输出，支持同步日志与异步日志、自定义日志格式、日志级别、多日志分离等功能。线程模块，封装pthread相关方法，封装常用的锁包括（信号量，读写锁，自旋锁等）。IO协程调度模块，基于ucontext_t实现非对称协程模型，以线程池的方式实现多线程，多协程协同调度，同时依赖epoll实现了事件监听机制。定时器模块，使用最小堆管理定时器，配合IO协程调度模块可以完成基于协程的定时任务调度。hook模块，将同步的系统调用封装成异步操作（accept, recv, send等），配合IO协程调度能够极大的提升服务器性能。Http模块，封装了sokcet常用方法，支持http协议解析，客户端实现连接池发送请求，服务器端实现servlet模式处理客户端请求，支持单Reator多线程，多Reator多线程模式的服务器。

序列化模块

• 序列化模块的底层存储是固定大小的块，以链表形式组织。每次写入数据时，将数据写入到链表最后一个块中，如果最后一个块不足以容纳数据，则分配一个新的块并添加到链表结尾，再写入数据。ByteArray会记录当前的操作位置，每次写入数据时，该操作位置按写入大小往后偏移，如果要读取数据，则必须调用setPosition重新设置当前的操作位置。
• 这样有个好处，不用一开始就开一个很大的空间去存储数据。

1. 主要功能

• 支持序列化固定长度的有符号/无符号8位、16位、32位、64位整数
• 支持序列化不固定长度的有符号/无符号32位、64位整数（使用zigzag算法进行压缩）
• 支持序列化float、double类型
• 支持序列化string和（length+string）的格式
• 支持将序列化内容输出到文件
• 支持大小端转换

2. 功能演示

代码语言：javascript

AI代码解释

std::vector<int32_t> res; johnsonli::ByteArray::ptr ba(new johnsonli::ByteArray(base_len)); for(int i = 0; i<len; ++i) { res.push_back(rand()); } for(auto &it : res) { ba->writeFint32(it); } ba->setPosition(0); // 读之前偏移量要设置为0 for(auto it : res) { int32_t val = ba->readFint32(); DO_ASSERT(it == val); } DO_ASSERT(ba->getReadSize() == 0); LOG_INFO(g_logger) << "writeFint32/readFint32" " (int32_t) len=" << len << " base_len=" << base_len << " size=" << ba->getSize();

3. 模块介绍

3.1 ByteArray

• 序列化类。封装一个内存块，使用链表将内存块连接，实现动态扩容

代码语言：javascript

AI代码解释

struct Node { Node(size_t s); //构造指定大小的内存块 Node(); ~Node(); char* ptr; //内存块地址指针 Node* next; //下一个内存块地址 size_t size; //内存块大小 };

• 主要支持以下方法

代码语言：javascript

AI代码解释

void writeFint8 (int8_t value); // 写入固定长度int8_t类型的数据 void writeFuint8 (uint8_t value); // 写入固定长度uint8_t类型的数据 // ... 16、32、64字节 void writeInt32 (int32_t value); // 压缩写入int32_t void writeUint32 (uint32_t value); // 压缩写入uint32_t // 64字节 void writeFloat (float value); void writeDouble(float value); void writeStringF16(const std::string& value); // 写入std::string类型的数据,用uint16_t作为长度类型 void writeStringWithoutLength(const std::string& value); // 不写长度 // ... void readFint8 (int8_t value); // 读取固定长度int8_t类型的数据 void readFuint8 (uint8_t value); // 读取固定长度uint8_t类型的数据 // ... 16、32、64字节 void readInt32 (int32_t value); // 读取压缩的int32_t void readUint32 (uint32_t value); // 读取压缩的uint32_t // 64字节 ...

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