Redis基础知识总结思维导图，系统的学习Redis。不定时更新。 主要包括： 基本数据和应用场景 常见问题分析 性能优化 持久化 集群模式 子模块 基本知识 基本数据类型和使用场景 基本数据类型 string 二进制安全，可以包含任何数据,一个键最大能存储512M hash 键值对集合，存储、读取、修改用户属性 list 链表(双向链表),可用于最新消息排行等功能(比如朋友圈的时间线)和消息队列 set 哈希表实现,元素不重复。可用于利用唯一性,统计访问网站的所有独立ip和好友推荐时
You have learned in Chapter 5 that there are four types of containers: engine, host, context, and wrapper. You have also built your own simple contexts and wrappers in previous chapters. A context normally has one or more wrappers, in which each wrapper represents a servlet definition. This chapter will now look at the standard implementation of the Wrapper interface in Catalina. It starts by explaining the sequence of methods that get invoked for each HTTP request and continues with the javax.servlet.SingleThreadModel interface. The chapter concludes by explaining the StandardWrapper and StandardWrapperValve classes. The application that accompanies this chapter uses StandardWrapper instances to represents servlets.
本文作者：carlosfu 原文链接：https://yq.aliyun.com/articles/236384 摘要： Jedis虽然使用起来比较简单，但是如果不能根据使用场景设置合理的参数(例如连接池参数)，不合理的使用一些功能(例如Lua和事务)也会产生很多问题，本文对这些问题逐个说明。 一.无法从连接池获取到Jedis连接 1.异常堆栈 (1) 连接池参数blockWhenExhausted = true(默认) 如果连接池没有可用Jedis连接，会等待maxWaitMillis(毫秒)，依然没有获
We found two way that can make the main thread locked. And we can not write any code to solve it and it can only be circumvented. The easiest way to reproduce this issue is to wait for the window in the main thread to close in the stylus input thread.
https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Conventions/Conventions.html Method Names Should Be Expressive and Unique Within a Class Once you’ve chosen a unique name for a class, the methods that you
Introduction Mono is an Open Source free programming language project. It is an implementation of Microsoft’s .NET Framework based on the European association for standardizing information and communication systems (ECMA) standards for C# language and Comm
hmset等批量操作命令与pipeline最大的区别是，前者是原子性命令，比如hmset，如果一次插入的field过多，会导致命令耗时增加；后者非原子性，只是批量的传输要执行命令，减少网络耗时。pipeline提升性能的关键，一是RTT，节省往返时间，二是I/O系统调用，read系统调用，需要从用户态，切换到内核态。
RUNNABLE：start方法已运行，所有条件都就绪。只等该线程获得CPU运行时间。
The ZIP file format is a common archive and compression standard. This module provides tools to create, read, write, append, and list a ZIP file. Any advanced use of this module will require an understanding of the format, as defined in PKZIP Application Note.
今天调试requet.GetRequestStreamAsync异步方法出现不返回的问题，可能是死锁了。看到老外一篇文章解释了异步方法死锁的问题，懒的翻译，直接搬过来了。
As you have witnessed in the previous chapters, a context represents a web application and contains one or more wrappers, each of which represents a servlet definition. However, a context requires other components as well, notably a loader and a manager. This chapter explains the org.apache.catalina.core.StandardContext class, which represents Catalina's standard implementation of the Context interface.
Rust doesn’t allow us to mark only certain fields as mutable. You can only mark whole struct as mutable or immutable.
原文地址：https://docs.microsoft.com/en-us/dotnet/architecture/dapr-for-net-developers/actors
Remember that arguments are passed by assignment in Python. Since assignment just creates references to objects, there’s no alias between an argument name in the caller and callee, and so no call-by-reference per se.
httptest是golang官方源码自带的测试包，它可以非常方便获取http请求结构体，http返回值结构体，以及在本地启动一个loopback的server，方便我们做单测。对于go的web应用程序中往往需要与其他系统进行交互， 比如通过http访问其他系统， 此时就需要一种方法用于打桩来模拟Web服务端和客户端，httptest包即Go语言针对Web应用提供的解决方案。
调用generator function时，返回一个iterator（函数内语句不被会执行），调用iterator函数时，执行到yield表达式，
org/springframework/http/client/ClientHttpRequestFactory.java
A timer object can be registered in only one run loop at a time, although it can be added to multiple run loop modes within that run loop. There are three ways to create a timer:
The NSOperationQueue class regulates the execution of a set of NSOperation objects. After being added to a queue, an operation remains in that queue until it is explicitly canceled or finishes executing its task. Operations within the queue (but not yet executing) are themselves organized according to priority levels and inter-operation object dependencies and are executed accordingly. An application may create multiple operation queues and submit operations to any of them.
其实出现这个的原因是Servlet在socket上的读取只能一次。request.getParameter与request.getInputStream这两个系列的方法 能不能取到值， 就完全取决于你调用的先后顺序了。
spring-beans/src/main/java/org/springframework/beans/factory/DisposableBean.java
A container is a module that processes the requests for a servlet and populates the response objects for web clients. A container is represented by the org.apache.catalina.Container interface and there are four types of containers: Engine, Host, Context, and Wrapper. This chapter covers Context and Wrapper and leaves Engine and Host to Chapter 13. This chapter starts with the discussion of the Container interface, followed by the pipelining mechanism in a container. It then looks at the Wrapper and Context interfaces. Two applications conclude this chapter by presenting a simple wrapper and a simple context respectively.
FileInputStream类close()方法 (FileInputStream Class close() method)
In traditional Java high-concurrency projects, context switching of threads brings huge memory overhead. The emergence of thread pools solved these problems to some extent, but Java threads still could not escape the control of the OS. Thus, virtual threads came into being.
Functions in Kotlin are declared using the fun keyword:
Cloneable接口与Serializable接口都是定义接口而没有任何的方法。Cloneable可以实现对象的克隆复制，Serializable主要是对象序列化的接口定义。很多时候我们涉及到对象的复制，我们不可能都去使用setter去实现，这样编写代码的效率太低。JDK提供的Cloneable接口正是为了解决对象复制的问题而存在。Cloneable结合Serializable接口可以实现JVM对象的深度复制。
An array is a data structure used to store data of the same type. Arrays store their elements in contiguous memory locations.
在 Spring 中，@Async 标注的方法，在执行的时候，是异步运行的，它运行在独立的线程中，程序不会被该方法所阻塞。
The connector in Chapter 3 worked fine and could have been perfected to achieve much more. However, it was designed as an educational tool, an introduction to Tomcat 4's default connector. Understanding the connector in Chapter 3 is key to understanding the default connector that comes with Tomcat 4. Chapter 4 will now discuss what it takes to build a real Tomcat connector by dissecting the code of Tomcat 4's default connector.
Cast one of the operands of this integer division to a "double"
本文对 try-with-resources 语法进行了较为深入的剖析，验证了其为一种语法糖，同时给出了其实际的实现方式的反编译结果，相信你在看完本文后，关于 AutoCloseable 的使用你会有新的收获。
强调一下 BLOCKED 状态跟 I/O 的阻塞是不同的，它不是一般意义上的阻塞，而是特指被 synchronized 块阻塞，即是跟线程同步有关的一个状态。
OC是消息转发机制，代码在编译的时候会生产Runtime中间代码，运行的时候执行Runtime代码，我们也可以动态的添加Runtime代码。
React 是一个十分庞大的库，由于要同时考虑 ReactDom 和 ReactNative ，还有服务器渲染等，导致其代码抽象化程度很高，嵌套层级非常深，阅读其源码是一个非常艰辛的过程。在学习 React 源码的过程中，给我帮助最大的就是这个系列文章，于是决定基于这个系列文章谈一下自己的理解。本文会大量用到原文中的例子，想体会原汁原味的感觉，推荐阅读原文。
JDK 15 is the open-source reference implementation of version 15 of the Java SE Platform, as specified by by JSR 390 in the Java Community Process.
从上一章对UiDevice的学习，可以看出几乎所有的操作都离不开 UiAutomationBridge。重新看一下UIDevice的构造方法：
The ref keyword causes an argument to be passed by reference, not by value. The effect of passing by reference is that any change to the parameter in the called method is reflected in the calling method. For example, if the caller passes a local variable expression or an array element access expression, and the called method replaces the object to which the ref parameter refers, then the caller’s local variable or the array element now refer to the new object.
GATK，即Genome Analysis Toolkit，GATK 在鉴定肿瘤的SNP, INDEL, CNV 等方面也堪称行业标准。
可以看到里面是通过反射创建了一个NioServerSocketChannel 这个对象
Sometimes, there is a need to execute some operations between another pair of operations. For example, open a file, read from the file and close the file or acquire a lock on a data structure, work with the data structure and release the data structure. These kinds of requirements come up most especially when dealing with system resources where the resource is acquired, worked with and then released. It is important that the acquisition and release of such resources are handled carefully so that any errors that may occur are correctly handled. Writing code to handle this all the time leads to a lot of repetition and cumbersome code. Context managers provide a solution to this. They provide a mean for abstracting away a pair of operations that are executed before and after another group of operation using the with statement.
Contents Developing a Transactional BizTalk Adapter Using the Microsoft Base Adapter Classes.... 3 Transactions in Two-Way Adapter Interactions............................................................ 4 Transactions, Messages, and Batches.............
https://developers.google.com/docs/api/reference/rest/v1/documents/request#Request
As mentioned in Introduction, there are two main modules in Catalina: the connector and the container. In this chapter you will enhance the applications in Chapter 2 by writing a connector that creates better request and response objects. A connector compliant with Servlet 2.3 and 2.4 specifications must create instances of javax.servlet.http.HttpServletRequest and javax.servlet.http.HttpServletResponse to be passed to the invoked servlet's service method. In Chapter 2 the servlet containers could only run servlets that implement javax.servlet.Servlet and passed instances of javax.servlet.ServletRequest and javax.servlet.ServletResponse to the service method. Because the connector does not know the type of the servlet (i.e. whether it implements javax.servlet.Servlet, extends javax.servlet.GenericServlet, or extends javax.servlet.http.HttpServlet), the connector must always provide instances of HttpServletRequest and HttpServletResponse.
代码已托管到 https://github.com/yangshangwei/commonUtils
我们以前介绍过Pandas和ChaGPT整合，这样可以不了解Pandas的情况下对DataFrame进行操作。现在又有人开源了Scikit-LLM，它结合了强大的语言模型，如ChatGPT和scikit-learn。但这个并不是让我们自动化scikit-learn，而是将scikit-learn和语言模型进行整合，scikit-learn也可以处理文本数据了。
关于VM9的创建与使用可以参考：https://blog.csdn.net/a812073479/article/details/82994703
match 会遍历路由信息字典，找到所有匹配该路径最长的那个。路由部分的代码解释就到这里了，最后回答上面的一个问题：http.HandleFunc 和 ServeMux.HandlerFunc 是什么关系？ // Handle registers the handler for the given pattern // in the DefaultServeMux. // The documentation for ServeMux explains how patterns are matched. fu
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