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-
- socket 的阻塞模式和非阻塞模式
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="2.1.6" data-path="../网络编程/非阻塞模式下send和recv函数的返回值.html">
-
- <a href="../网络编程/非阻塞模式下send和recv函数的返回值.html">
-
-
- 非阻塞模式下 send 和 recv 函数的返回值
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="2.1.7" data-path="../网络编程/服务器开发通信协议设计介绍.html">
-
- <a href="../网络编程/服务器开发通信协议设计介绍.html">
-
-
- 服务器开发通信协议设计介绍
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="2.1.8" data-path="../网络编程/TCP协议如何解决粘包、半包问题.html">
-
- <a href="../网络编程/TCP协议如何解决粘包、半包问题.html">
-
-
- TCP 协议如何解决粘包、半包问题
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="2.1.9" data-path="../网络编程/网络通信中收发数据的正确姿势.html">
-
- <a href="../网络编程/网络通信中收发数据的正确姿势.html">
-
-
- 网络通信中收发数据的正确姿势
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="2.1.10" data-path="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
-
- <a href="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
-
-
- 服务器端发数据时，如果对端一直不收，怎么办？
-
- </a>
-
-
- </li>
-
- </ul>
-
- </li>
-
-
-
- <li class="divider"></li>
-
-
-
- <li class="chapter " data-level="3.1" data-path="../程序员必知必会的网络命令/">
-
- <a href="../程序员必知必会的网络命令/">
-
-
- 程序员必知必会的网络命令
-
- </a>
-
-
- <ul class="articles">
-
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- <li class="chapter " data-level="3.1.1" data-path="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
-
- <a href="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
-
-
- 利用telnet命令发电子邮件
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="3.1.2" data-path="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
-
- <a href="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
-
-
- 做Java或者C++开发都应该知道的lsof命令
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="3.1.3" data-path="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
-
- <a href="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
-
-
- Linux网络故障排查的瑞士军刀nc命令
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="3.1.4" data-path="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
-
- <a href="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
-
-
- Linux tcpdump使用详解
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="3.1.5" data-path="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
-
- <a href="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
-
-
- 从抓包的角度分析connect函数的连接过程
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="3.1.6" data-path="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
-
- <a href="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
-
-
- 服务器开发中网络数据分析与故障排查经验漫谈
-
- </a>
-
-
- </li>
-
- </ul>
-
- </li>
-
-
-
- <li class="header">Part II</li>
-
-
-
- <li class="chapter " data-level="4.1" data-path="../高性能服务器框架设计/">
-
- <a href="../高性能服务器框架设计/">
-
-
- 高性能服务器框架设计
-
- </a>
-
-
- <ul class="articles">
-
-
- <li class="chapter " data-level="4.1.1" data-path="../高性能服务器框架设计/主线程与工作线程的分工.html">
-
- <a href="../高性能服务器框架设计/主线程与工作线程的分工.html">
-
-
- 主线程与工作线程的分工
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.2" data-path="../高性能服务器框架设计/Reactor模式.html">
-
- <a href="../高性能服务器框架设计/Reactor模式.html">
-
-
- Reactor模式
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.3" data-path="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
-
- <a href="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
-
-
- 实例：一个服务器程序的架构介绍
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.4" data-path="../高性能服务器框架设计/错误码系统的设计.html">
-
- <a href="../高性能服务器框架设计/错误码系统的设计.html">
-
-
- 错误码系统的设计
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.5" data-path="../高性能服务器框架设计/日志系统的设计.html">
-
- <a href="../高性能服务器框架设计/日志系统的设计.html">
-
-
- 日志系统的设计
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.6" data-path="../高性能服务器框架设计/如何设计断线自动重连机制.html">
-
- <a href="../高性能服务器框架设计/如何设计断线自动重连机制.html">
-
-
- 如何设计断线自动重连机制
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.7" data-path="../高性能服务器框架设计/心跳包机制设计详解.html">
-
- <a href="../高性能服务器框架设计/心跳包机制设计详解.html">
-
-
- 心跳包机制设计详解
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.8" data-path="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
-
- <a href="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
-
-
- 业务数据处理一定要单独开线程吗
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.9" data-path="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
-
- <a href="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
-
-
- C++ 高性能服务器网络框架设计细节
-
- </a>
-
-
- </li>
-
- </ul>
-
- </li>
-
-
-
- <li class="divider"></li>
-
-
-
- <li class="chapter " data-level="5.1" data-path="../服务器开发案例实战/">
-
- <a href="../服务器开发案例实战/">
-
-
- 服务器开发案例实战
-
- </a>
-
-
- <ul class="articles">
-
-
- <li class="chapter " data-level="5.1.1" data-path="../服务器开发案例实战/从零实现一个http服务器.html">
-
- <a href="../服务器开发案例实战/从零实现一个http服务器.html">
-
-
- 从零实现一个http服务器
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.2" data-path="../服务器开发案例实战/从零实现一款12306刷票软件.html">
-
- <a href="../服务器开发案例实战/从零实现一款12306刷票软件.html">
-
-
- 从零实现一款12306刷票软件
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.3" data-path="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
-
- <a href="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
-
-
- 从零实现一个邮件收发客户端
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.4" data-path="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
-
- <a href="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
-
-
- 从零开发一个WebSocket服务器
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.5" data-path="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
-
- <a href="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
-
-
- 从零学习开源项目系列（一） 从一款多人联机实时对战游戏开始
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.6" data-path="../服务器开发案例实战/2最后一战概况.html">
-
- <a href="../服务器开发案例实战/2最后一战概况.html">
-
-
- 从零学习开源项目系列（二） 最后一战概况
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.7" data-path="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
-
- <a href="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
-
-
- 从零学习开源项目系列（三） CSBattleMgr服务源码研究
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.8" data-path="../服务器开发案例实战/4LogServer源码探究.html">
-
- <a href="../服务器开发案例实战/4LogServer源码探究.html">
-
-
- 从零学习开源项目系列（四）LogServer源码探究
-
- </a>
-
-
- </li>
-
- </ul>
-
- </li>
-
-
-
- <li class="header">Part III</li>
-
-
-
- <li class="chapter " data-level="6.1" data-path="../TeamTalk源码解析/">
-
- <a href="../TeamTalk源码解析/">
-
-
- TeamTalk IM源码分析
-
- </a>
-
-
- <ul class="articles">
-
-
- <li class="chapter " data-level="6.1.1" data-path="../TeamTalk源码解析/01TeamTalk介绍.html">
-
- <a href="../TeamTalk源码解析/01TeamTalk介绍.html">
-
-
- 01 TeamTalk介绍
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.2" data-path="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
-
- <a href="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
-
-
- 02 服务器端的程序的编译与部署
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.3" data-path="../TeamTalk源码解析/03服务器端的程序架构介绍.html">
-
- <a href="../TeamTalk源码解析/03服务器端的程序架构介绍.html">
-
-
- 03 服务器端的程序架构介绍
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.4" data-path="../TeamTalk源码解析/04服务器端db_proxy_server源码分析.html">
-
- <a href="../TeamTalk源码解析/04服务器端db_proxy_server源码分析.html">
-
-
- 04 服务器端db_proxy_server源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.5" data-path="../TeamTalk源码解析/05服务器端msg_server源码分析.html">
-
- <a href="../TeamTalk源码解析/05服务器端msg_server源码分析.html">
-
-
- 05 服务器端msg_server源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.6" data-path="../TeamTalk源码解析/06服务器端login_server源码分析.html">
-
- <a href="../TeamTalk源码解析/06服务器端login_server源码分析.html">
-
-
- 06 服务器端login_server源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.7" data-path="../TeamTalk源码解析/07服务器端msfs源码分析.html">
-
- <a href="../TeamTalk源码解析/07服务器端msfs源码分析.html">
-
-
- 07 服务器端msfs源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.8" data-path="../TeamTalk源码解析/08服务器端file_server源码分析.html">
-
- <a href="../TeamTalk源码解析/08服务器端file_server源码分析.html">
-
-
- 08 服务器端file_server源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.9" data-path="../TeamTalk源码解析/09服务器端route_server源码分析.html">
-
- <a href="../TeamTalk源码解析/09服务器端route_server源码分析.html">
-
-
- 09 服务器端route_server源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.10" data-path="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
-
- <a href="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
-
-
- 10 开放一个TeamTalk测试服务器地址和几个测试账号
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.11" data-path="../TeamTalk源码解析/11pc客户端源码分析.html">
-
- <a href="../TeamTalk源码解析/11pc客户端源码分析.html">
-
-
- 11 pc客户端源码分析
-
- </a>
-
-
- </li>
-
- </ul>
-
- </li>
-
-
-
- <li class="divider"></li>
-
-
-
- <li class="chapter " data-level="7.1" data-path="../libevent源码深度剖析/">
-
- <a href="../libevent源码深度剖析/">
-
-
- libevent源码深度剖析
-
- </a>
-
-
- <ul class="articles">
-
-
- <li class="chapter " data-level="7.1.1" data-path="../libevent源码深度剖析/libevent源码深度剖析01.html">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析01.html">
-
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- libevent源码深度剖析01
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.2" data-path="../libevent源码深度剖析/libevent源码深度剖析02.html">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析02.html">
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- libevent源码深度剖析02
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.1.3" data-path="../libevent源码深度剖析/libevent源码深度剖析03.html">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析03.html">
-
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- libevent源码深度剖析03
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.1.4" data-path="../libevent源码深度剖析/libevent源码深度剖析04.html">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析04.html">
-
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- libevent源码深度剖析04
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.5" data-path="../libevent源码深度剖析/libevent源码深度剖析05.html">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析05.html">
-
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- libevent源码深度剖析05
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.1.6" data-path="../libevent源码深度剖析/libevent源码深度剖析06.html">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析06.html">
-
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- libevent源码深度剖析06
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.7" data-path="../libevent源码深度剖析/libevent源码深度剖析07.html">
-
- <a href="../libevent源码深度剖析/libevent源码深度剖析07.html">
-
-
- libevent源码深度剖析07
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.8" data-path="../libevent源码深度剖析/libevent源码深度剖析08.html">
-
- <a href="../libevent源码深度剖析/libevent源码深度剖析08.html">
-
-
- libevent源码深度剖析08
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.9" data-path="../libevent源码深度剖析/libevent源码深度剖析09.html">
-
- <a href="../libevent源码深度剖析/libevent源码深度剖析09.html">
-
-
- libevent源码深度剖析09
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.10" data-path="../libevent源码深度剖析/libevent源码深度剖析10.html">
-
- <a href="../libevent源码深度剖析/libevent源码深度剖析10.html">
-
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- libevent源码深度剖析10
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.11" data-path="../libevent源码深度剖析/libevent源码深度剖析11.html">
-
- <a href="../libevent源码深度剖析/libevent源码深度剖析11.html">
-
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- libevent源码深度剖析11
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.12" data-path="../libevent源码深度剖析/libevent源码深度剖析12.html">
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- libevent源码深度剖析12
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- </a>
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- </a>
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- </ul>
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- <a href="./">
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- leveldb源码分析
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- leveldb源码分析1
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- leveldb源码分析2
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- </a>
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- <li class="chapter " data-level="7.2.3" data-path="leveldb源码分析3.html">
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- leveldb源码分析3
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- </a>
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- <li class="chapter " data-level="7.2.4" data-path="leveldb源码分析4.html">
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- leveldb源码分析4
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- </a>
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- <li class="chapter " data-level="7.2.5" data-path="leveldb源码分析5.html">
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- leveldb源码分析5
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- </a>
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- leveldb源码分析6
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- leveldb源码分析7
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- <li class="chapter " data-level="7.2.8" data-path="leveldb源码分析8.html">
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- leveldb源码分析8
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- leveldb源码分析9
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- <li class="chapter " data-level="7.2.10" data-path="leveldb源码分析10.html">
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- leveldb源码分析11
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- <li class="chapter " data-level="7.2.12" data-path="leveldb源码分析12.html">
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- leveldb源码分析12
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- </a>
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- <li class="chapter " data-level="7.2.13" data-path="leveldb源码分析13.html">
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- leveldb源码分析13
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- <li class="chapter " data-level="7.2.14" data-path="leveldb源码分析14.html">
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- leveldb源码分析14
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- </a>
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- </li>
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- <li class="chapter " data-level="7.2.15" data-path="leveldb源码分析15.html">
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- leveldb源码分析15
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- </a>
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- </li>
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- <li class="chapter " data-level="7.2.16" data-path="leveldb源码分析16.html">
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- leveldb源码分析16
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- </a>
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-
- </li>
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- <li class="chapter " data-level="7.2.17" data-path="leveldb源码分析17.html">
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- <a href="leveldb源码分析17.html">
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- leveldb源码分析17
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- </a>
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- </li>
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- <li class="chapter " data-level="7.2.18" data-path="leveldb源码分析18.html">
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- <a href="leveldb源码分析18.html">
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- leveldb源码分析18
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.2.19" data-path="leveldb源码分析19.html">
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- <a href="leveldb源码分析19.html">
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- leveldb源码分析19
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.2.20" data-path="leveldb源码分析20.html">
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- <a href="leveldb源码分析20.html">
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-
- leveldb源码分析20
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- </a>
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-
- </li>
-
- <li class="chapter active" data-level="7.2.21" data-path="leveldb源码分析21.html">
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- <a href="leveldb源码分析21.html">
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-
- leveldb源码分析21
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- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.2.22" data-path="leveldb源码分析22.html">
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- <a href="leveldb源码分析22.html">
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-
- leveldb源码分析22
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- </a>
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-
- </li>
-
- </ul>
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- </li>
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- <li class="divider"></li>
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- <li class="chapter " data-level="8.1" data-path="../Memcached源码分析/">
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- <a href="../Memcached源码分析/">
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-
- Memcached源码分析
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- </a>
-
-
- <ul class="articles">
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-
- <li class="chapter " data-level="8.1.1" data-path="../Memcached源码分析/00服务器资源调整.html">
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- <a href="../Memcached源码分析/00服务器资源调整.html">
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- 00 服务器资源调整
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.2" data-path="../Memcached源码分析/01初始化参数解析.html">
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- <a href="../Memcached源码分析/01初始化参数解析.html">
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-
- 01 初始化参数解析
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- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.3" data-path="../Memcached源码分析/02网络监听的建立.html">
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- <a href="../Memcached源码分析/02网络监听的建立.html">
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-
- 02 网络监听的建立
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.4" data-path="../Memcached源码分析/03网络连接建立.html">
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- <a href="../Memcached源码分析/03网络连接建立.html">
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-
- 03 网络连接建立
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.5" data-path="../Memcached源码分析/04内存初始化.html">
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- <a href="../Memcached源码分析/04内存初始化.html">
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-
- 04 内存初始化
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- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.6" data-path="../Memcached源码分析/05资源初始化.html">
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- <a href="../Memcached源码分析/05资源初始化.html">
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-
- 05 资源初始化
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.7" data-path="../Memcached源码分析/06get过程.html">
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- <a href="../Memcached源码分析/06get过程.html">
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-
- 06 get过程
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.8" data-path="../Memcached源码分析/07cas属性.html">
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- <a href="../Memcached源码分析/07cas属性.html">
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-
- 07 cas属性
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.9" data-path="../Memcached源码分析/08内存池.html">
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- <a href="../Memcached源码分析/08内存池.html">
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-
- 08 内存池
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.10" data-path="../Memcached源码分析/09连接队列.html">
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- <a href="../Memcached源码分析/09连接队列.html">
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-
- 09 连接队列
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.11" data-path="../Memcached源码分析/10Hash表操作.html">
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- <a href="../Memcached源码分析/10Hash表操作.html">
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-
- 10 Hash表操作
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.12" data-path="../Memcached源码分析/12set操作.html">
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- <a href="../Memcached源码分析/12set操作.html">
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-
- 12 set操作
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.13" data-path="../Memcached源码分析/13do_item_alloc操作.html">
-
- <a href="../Memcached源码分析/13do_item_alloc操作.html">
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-
- 13 do_item_alloc操作
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.14" data-path="../Memcached源码分析/14item结构.html">
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- <a href="../Memcached源码分析/14item结构.html">
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-
- 14 item结构
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.15" data-path="../Memcached源码分析/15Hash表扩容.html">
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- <a href="../Memcached源码分析/15Hash表扩容.html">
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-
- 15 Hash表扩容
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.16" data-path="../Memcached源码分析/16线程交互.html">
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- <a href="../Memcached源码分析/16线程交互.html">
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-
- 16 线程交互
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.17" data-path="../Memcached源码分析/17状态机.html">
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- <a href="../Memcached源码分析/17状态机.html">
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-
- 17 状态机
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- </a>
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-
- </li>
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- </ul>
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- </li>
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- <li class="divider"></li>
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- 游戏开发专题
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-
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- <ul class="articles">
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- <li class="chapter " data-level="9.1.1" data-path="../游戏开发专题/1游戏服务器开发的基本体系与服务器端开发的一些建议.html">
-
- <a href="../游戏开发专题/1游戏服务器开发的基本体系与服务器端开发的一些建议.html">
-
-
- 1 游戏服务器开发的基本体系与服务器端开发的一些建议
-
- </a>
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-
- </li>
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- <li class="chapter " data-level="9.1.2" data-path="../游戏开发专题/2网络游戏服务器开发框架设计介绍.html">
-
- <a href="../游戏开发专题/2网络游戏服务器开发框架设计介绍.html">
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-
- 2 网络游戏服务器开发框架设计介绍
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="9.1.3" data-path="../游戏开发专题/3游戏后端开发需要掌握的知识.html">
-
- <a href="../游戏开发专题/3游戏后端开发需要掌握的知识.html">
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-
- 3 游戏后端开发需要掌握的知识
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="9.1.4" data-path="../游戏开发专题/4关于游戏服务端架构的整理.html">
-
- <a href="../游戏开发专题/4关于游戏服务端架构的整理.html">
-
-
- 4 关于游戏服务端架构的整理
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="9.1.5" data-path="../游戏开发专题/5各类游戏对应的服务端架构.html">
-
- <a href="../游戏开发专题/5各类游戏对应的服务端架构.html">
-
-
- 5 各类游戏对应的服务端架构
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="9.1.6" data-path="../游戏开发专题/6从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则.html">
-
- <a href="../游戏开发专题/6从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则.html">
-
-
- 6 从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="9.1.7" data-path="../游戏开发专题/7QQ游戏百万人同时在线服务器架构实现.html">
-
- <a href="../游戏开发专题/7QQ游戏百万人同时在线服务器架构实现.html">
-
-
- 7 QQ游戏百万人同时在线服务器架构实现
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="9.1.8" data-path="../游戏开发专题/8大型多人在线游戏服务器架构设计.html">
-
- <a href="../游戏开发专题/8大型多人在线游戏服务器架构设计.html">
-
-
- 8 大型多人在线游戏服务器架构设计
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="9.1.9" data-path="../游戏开发专题/9百万用户级游戏服务器架构设计.html">
-
- <a href="../游戏开发专题/9百万用户级游戏服务器架构设计.html">
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-
- 9 百万用户级游戏服务器架构设计
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="9.1.10" data-path="../游戏开发专题/10十万在线的WebGame的数据库设计思路.html">
-
- <a href="../游戏开发专题/10十万在线的WebGame的数据库设计思路.html">
-
-
- 10 十万在线的WebGame的数据库设计思路
-
- </a>
-
-
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-
- <li class="chapter " data-level="9.1.11" data-path="../游戏开发专题/11一种高性能网络游戏服务器架构设计.html">
-
- <a href="../游戏开发专题/11一种高性能网络游戏服务器架构设计.html">
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-
- 11 一种高性能网络游戏服务器架构设计
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="9.1.12" data-path="../游戏开发专题/12经典游戏服务器端架构概述.html">
-
- <a href="../游戏开发专题/12经典游戏服务器端架构概述.html">
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- 12 经典游戏服务器端架构概述
-
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-
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-
- <li class="chapter " data-level="9.1.13" data-path="../游戏开发专题/13游戏跨服架构进化之路.html">
-
- <a href="../游戏开发专题/13游戏跨服架构进化之路.html">
-
-
- 13 游戏跨服架构进化之路
-
- </a>
-
-
- </li>
-
- </ul>
-
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-
-
- <li class="header">Part IV</li>
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-
- <li class="chapter " data-level="10.1" data-path="../程序员面试题精讲/">
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- 程序员面试题精讲
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- 腾讯后台开发实习生技能要求
-
- </a>
-
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- </li>
-
- <li class="chapter " data-level="10.1.2" data-path="../程序员面试题精讲/聊聊如何拿大厂的offer.html">
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- <a href="../程序员面试题精讲/聊聊如何拿大厂的offer.html">
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- 聊聊如何拿大厂的 offer
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="10.1.3" data-path="../程序员面试题精讲/网络通信题目集锦.html">
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- <a href="../程序员面试题精讲/网络通信题目集锦.html">
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- 网络通信题目集锦
-
- </a>
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-
- <li class="chapter " data-level="10.1.4" data-path="../程序员面试题精讲/我面试后端开发经理的经历.html">
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- <a href="../程序员面试题精讲/我面试后端开发经理的经历.html">
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- 我面试后端开发经理的经历
-
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-
- </li>
-
- <li class="chapter " data-level="10.1.5" data-path="../程序员面试题精讲/LinuxCC++后端开发面试问哪些问题.html">
-
- <a href="../程序员面试题精讲/LinuxCC++后端开发面试问哪些问题.html">
-
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- Linux C/C++后端开发面试问哪些问题
-
- </a>
-
-
- </li>
-
- </ul>
-
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- <li class="chapter " data-level="10.2" data-path="../职业规划/">
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- 职业规划
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- <ul class="articles">
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- <li class="chapter " data-level="10.2.1" data-path="../职业规划/给工作4年迷茫的程序员们的一点建议.html">
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- <a href="../职业规划/给工作4年迷茫的程序员们的一点建议.html">
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- 给工作 4 年迷茫的程序员们的一点建议
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- <div id="anchor-navigation-ex-navbar"><i class="fa fa-navicon"></i><ul><li><span class="title-icon "></span><a href="#leveldb源码分析21"><b></b>leveldb源码分析21</a></li><ul><li><span class="title-icon "></span><a href="#14-db的查询与遍历之1"><b></b>14 DB的查询与遍历之1</a></li><ul><li><span class="title-icon "></span><a href="#141-get"><b></b>14.1 Get()</a></li><li><span class="title-icon "></span><a href="#142-newiterator"><b></b>14.2 NewIterator()</a></li><li><span class="title-icon "></span><a href="#143-mergingiterator"><b></b>14.3 MergingIterator</a></li></ul></ul></ul></div><h1 id="leveldb源码分析21"><a name="leveldb源码分析21" class="anchor-navigation-ex-anchor" href="#leveldb源码分析21"><i class="fa fa-link" aria-hidden="true"></i></a>leveldb源码分析21</h1>
- <p>本系列《leveldb源码分析》共有22篇文章，这是第二十一篇</p>
- <h2 id="14-db的查询与遍历之1"><a name="14-db的查询与遍历之1" class="anchor-navigation-ex-anchor" href="#14-db的查询与遍历之1"><i class="fa fa-link" aria-hidden="true"></i></a>14 DB的查询与遍历之1</h2>
- <p>分析完如何打开和关闭db，本章就继续分析如何<strong>从db中根据key查询value</strong>，以及<strong>遍历整个db</strong>。</p>
- <h3 id="141-get"><a name="141-get" class="anchor-navigation-ex-anchor" href="#141-get"><i class="fa fa-link" aria-hidden="true"></i></a>14.1 Get()</h3>
- <p>函数声明：<strong>StatusGet(const ReadOptions& options, const Slice& key, std::string* value)</strong>
- 从DB中查询key 对应的value，参数@options指定读取操作的选项，典型的如snapshot号，从指定的快照中读取。快照本质上就是一个sequence号，后面将单独在快照一章中分析。
- 下面就来分析下函数逻辑：</p>
- <pre class="language-"><code>// S1 锁mutex，防止并发，如果指定option则尝试获取snapshot；然后增加MemTable的引用值。
- MutexLock l(&mutex_);
- SequenceNumber snapshot;
- if (options.snapshot != NULL)
- snapshot = reinterpret_cast<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>const</span> <span class="token attr-name">SnapshotImpl*</span><span class="token punctuation">></span></span>(options.snapshot)->number_;
- else snapshot = versions_->LastSequence(); // 取当前版本的最后Sequence
- MemTable *mem = mem_, *imm = imm_;
- Version* current = versions_->current();
- mem->Ref();
- if (imm != NULL) imm->Ref();
- current->Ref();
- // S2 从sstable文件和MemTable中读取时，释放锁mutex；之后再次锁mutex。
- bool have_stat_update = false;
- Version::GetStats stats;
- {
- mutex_.Unlock();
- // 先从memtable中查询，再从immutable memtable中查询
- LookupKey lkey(key, snapshot);
- if (mem->Get(lkey, value, &s)) {
- }
- else if (imm != NULL && imm->Get(lkey, value, &s)) {
- }
- else { // 需要从sstable文件中查询
- s = current->Get(options, lkey, value, &stats);
- have_stat_update = true; // 记录之，用于compaction
- }
- mutex_.Lock();
- }
- // S3 如果是从sstable文件查询出来的，检查是否需要做compaction。最后把MemTable的引用计数减1。
- if (have_stat_update &¤t->UpdateStats(stats)) {
- MaybeScheduleCompaction();
- }
- mem->Unref();
- if (imm != NULL)imm->Unref();
- current->Unref();
- </code></pre><p>查询是比较简单的操作，UpdateStats在前面Version一节已经分析过。</p>
- <h3 id="142-newiterator"><a name="142-newiterator" class="anchor-navigation-ex-anchor" href="#142-newiterator"><i class="fa fa-link" aria-hidden="true"></i></a>14.2 NewIterator()</h3>
- <p>函数声明：<strong>Iterator*NewIterator(const ReadOptions& options)</strong>
- 通过该函数生产了一个Iterator<em>对象，调用这就可以基于该对象遍历db内容了。
- 函数很简单，调用两个函数创建了一个二级<em>*Iterator</em></em>。</p>
- <pre class="language-"><code>Iterator* DBImpl::NewIterator(const ReadOptions& options) {
- SequenceNumber latest_snapshot;
- Iterator* internal_iter = NewInternalIterator(options, &latest_snapshot);
- returnNewDBIterator(&dbname_, env_, user_comparator(), internal_iter,
- (options.snapshot != NULL
- ? reinterpret_cast<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>constSnapshotImpl*</span><span class="token punctuation">></span></span>(options.snapshot)->number_
- : latest_snapshot));
- }
- </code></pre><p>其中，函数NewDBIterator直接返回了一个<strong>DBIter</strong>指针</p>
- <pre class="language-"><code>Iterator* NewDBIterator(const std::string* dbname, Env* env,
- const Comparator*user_key_comparator, Iterator* internal_iter,
- const SequenceNumber& sequence) {
- return new DBIter(dbname, env, user_key_comparator, internal_iter, sequence);
- }
- </code></pre><p>函数NewInternalIterator有一些处理逻辑，就是收集所有能用到的iterator，生产一个Merging Iterator。这包括MemTable，Immutable MemTable，以及各sstable。</p>
- <pre class="language-"><code>Iterator* DBImpl::NewInternalIterator(const ReadOptions& options,
- SequenceNumber*latest_snapshot) {
- IterState* cleanup = newIterState;
- mutex_.Lock();
- // 根据last sequence设置lastest snapshot，并收集所有的子iterator
- *latest_snapshot = versions_->LastSequence();
- std::vector<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>Iterator*</span><span class="token punctuation">></span></span>list;
- list.push_back(mem_->NewIterator()); // >memtable
- mem_->Ref();
- if (imm_ != NULL) {
- list.push_back(imm_->NewIterator()); // >immutablememtable
- imm_->Ref();
- }
- versions_->current()->AddIterators(options, &list); // >current的所有sstable
- Iterator* internal_iter = NewMergingIterator(&internal_comparator_, &list[0], list.size());
- versions_->current()->Ref();
- // 注册清理机制
- cleanup->mu = &mutex_;
- cleanup->mem = mem_;
- cleanup->imm = imm_;
- cleanup->version = versions_->current();
- internal_iter->RegisterCleanup(CleanupIteratorState, cleanup, NULL);
- mutex_.Unlock();
- return internal_iter;
- }
- </code></pre><p>这个清理函数CleanupIteratorState是很简单的，对注册的对象做一下Unref操作即可。</p>
- <pre class="language-"><code>static void CleanupIteratorState(void* arg1, void* arg2) {
- IterState* state = reinterpret_cast<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>IterState*</span><span class="token punctuation">></span></span>(arg1);
- state->mu->Lock();
- state->mem->Unref();
- if (state->imm != NULL)state->imm->Unref();
- state->version->Unref();
- state->mu->Unlock();
- delete state;
- }
- </code></pre><p>可见对于db的遍历依赖于DBIter和Merging Iterator这两个迭代器，它们都是Iterator接口的实现子类。</p>
- <h3 id="143-mergingiterator"><a name="143-mergingiterator" class="anchor-navigation-ex-anchor" href="#143-mergingiterator"><i class="fa fa-link" aria-hidden="true"></i></a>14.3 MergingIterator</h3>
- <p>MergingIterator是一个合并迭代器，它内部使用了一组自Iterator，保存在其成员数组children_中。如上面的函数NewInternalIterator，包括memtable，immutable memtable，以及各sstable文件；它所做的就是根据调用者指定的key和sequence，从这些Iterator中找到合适的记录。
- 在分析其Iterator接口之前，先来看看两个辅助函数FindSmallest和FindLargest。FindSmallest<strong>从0开始向后遍历内部Iterator数组</strong>，找到key最小的Iterator，并设置到current<em>；FindLargest从<strong>最后一个向前遍历内部Iterator数组</strong>，找到key最大的Iterator，并设置到current</em>；
- MergingIterator还定义了两个移动方向：kForward，向前移动；kReverse，向后移动。 </p>
- <h4 id="1431-get系接口"><a name="1431-get系接口" class="anchor-navigation-ex-anchor" href="#1431-get系接口"><i class="fa fa-link" aria-hidden="true"></i></a>14.3.1 Get系接口</h4>
- <p>下面就把其接口拖出来一个一个分析，首先是简单接口，key和value都是返回current<em>的值，current</em>是当前seek到的Iterator位置。</p>
- <pre class="language-"><code>virtual Slice key() const {
- assert(Valid());
- return current_->key();
- }
- virtual Slice value() const {
- assert(Valid());
- return current_->value();
- }
- virtual Status status() const {
- Status status;
- for (int i = 0; i < n_; i++) { // 只有所有内部Iterator都ok时，才返回ok
- status = children_[i].status();
- if (!status.ok()) break;
- }
- return status;
- }
- </code></pre><h4 id="1432-seek系接口"><a name="1432-seek系接口" class="anchor-navigation-ex-anchor" href="#1432-seek系接口"><i class="fa fa-link" aria-hidden="true"></i></a>14.3.2 Seek系接口</h4>
- <p>然后是几个seek系的函数，也比较简单，都是依次调用内部Iterator的seek系函数。然后做merge，对于Seek和SeekToFirst都调用FindSmallest；对于SeekToLast调用FindLargest。</p>
- <pre class="language-"><code>virtual void SeekToFirst() {
- for (int i = 0; i < n_; i++) children_[i].SeekToFirst();
- FindSmallest();
- direction_ = kForward;
- }
- virtual void SeekToLast() {
- for (int i = 0; i < n_; i++) children_[i].SeekToLast();
- FindLargest();
- direction_ = kReverse;
- }
- virtual void Seek(constSlice& target) {
- for (int i = 0; i < n_; i++) children_[i].Seek(target);
- FindSmallest();
- direction_ = kForward;
- }
- </code></pre><h4 id="1433-逐步移动"><a name="1433-逐步移动" class="anchor-navigation-ex-anchor" href="#1433-逐步移动"><i class="fa fa-link" aria-hidden="true"></i></a>14.3.3 逐步移动</h4>
- <p>最后就是Next和Prev函数，完成迭代遍历。这可能会有点绕。下面分别来说明。
- 首先，在Next移动时，如果当前direction不是kForward的，也就是上一次调用了Prev或者SeekToLast函数，就需要先调整除current之外的所有iterator，为什么要做这种调整呢？啰嗦一点，考虑如下的场景，如图14.3-1所示。</p>
- <p><img src="../imgs/leveldb19.webp" alt=""></p>
- <p>图14.3-1 Next的移动</p>
- <p>当前direction为kReverse，并且有：<strong>Current = memtable Iterator</strong>。各Iterator位置为：{memtable, stable 0, sstable1} ={ key3:1:1, key2:3:1, key2:1:1}，这符合prev操作的largest key要求。
- 注：需要说明下，对于每个update操作，leveldb都会赋予一个全局唯一的sequence号，且是递增的。例子中的sequence号可理解为每个key的相对值，后面也是如此。
- 接下来我们来分析Prev移动的操作。
- 第一次Prev，current(memtable iterator)移动到key1:3:0上，3者中最大者变成sstable0；因此current修改为sstable0；
- 第二次Prev，current(sstable0 Iterator)移动到key1:2:1上，3者中最大者变成sstable1；因此current修改为sstable1:
- 此时各Iterator的位置为{memtable, sstable 0, sstable1} = { key1:3:0, key1:2:1, key2:2:1}，并且current=sstable1。
- 接下来再调用Next，显然当前Key()为key2:2:1，综合考虑3个iterator，两次Next()的调用结果应该是key2:1:1和key3:1:1。而memtable和sstable0指向的key却是key1:3:0和key1:2:1，这时就需要调整memtable和sstable0了，使他们都定位到Key()之后，也就是key3:1:1和key2:3:1上。
- 然后current(current1)Next移动到key2:1:1上。这就是Next时的调整逻辑，同理，对于Prev也有相同的调整逻辑。代码如下：</p>
- <pre class="language-"><code>virtual void Next() {
- assert(Valid());
- // 确保所有的子Iterator都定位在key()之后.
- // 如果我们在正向移动，对于除current_外的所有子Iterator这点已然成立
- // 因为current_是最小的子Iterator，并且key() = current_->key()。
- // 否则，我们需要明确设置其它的子Iterator
- if (direction_ != kForward) {
- for (int i = 0; i < n_; i++) { // 把所有current之外的Iterator定位到key()之后
- IteratorWrapper* child = &children_[i];
- if (child != current_) {
- child->Seek(key());
- if (child->Valid() && comparator_->Compare(key(), child->key()) == 0)
- child->Next(); // key等于current_->key()的，再向后移动一位
- }
- }
- direction_ = kForward;
- }
- // current也向后移一位，然后再查找key最小的Iterator
- current_->Next();
- FindSmallest();
- }
- virtual void Prev() {
- assert(Valid());
- // 确保所有的子Iterator都定位在key()之前.
- // 如果我们在逆向移动，对于除current_外的所有子Iterator这点已然成立
- // 因为current_是最大的，并且key() = current_->key()
- // 否则，我们需要明确设置其它的子Iterator
- if (direction_ != kReverse) {
- for (int i = 0; i < n_; i++) {
- IteratorWrapper* child = &children_[i];
- if (child != current_) {
- child->Seek(key());
- if (child->Valid()) {
- // child位于>=key()的第一个entry上，prev移动一位到<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>key()</span>
- <span class="token attr-name">child-</span><span class="token punctuation">></span></span>Prev();
- }
- else { // child所有的entry都 < key()，直接seek到last即可
- child->SeekToLast();
- }
- }
- }
- direction_ = kReverse;
- }
- //current也向前移一位，然后再查找key最大的Iterator
- current_->Prev();
- FindLargest();
- }
- </code></pre><p>这就是MergingIterator的全部代码逻辑了，每次Next或者Prev移动时，都要重新遍历所有的子Iterator以找到key最小或最大的Iterator作为current_。这就是merge的语义所在了。
- 但是它没有考虑到删除标记等问题，因此直接使用MergingIterator是不能正确的遍历DB的，这些问题留待给DBIter来解决。</p>
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