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Technical research background As the current R & D team is in the start-up stage of the company, there is no mature operation and maintenance system, and the ability to build and maintain the mature MQ commonly seen in the market is insufficient. However, we hope to have a lightweight message system for the members of the R & D team. T ...

Overview: Introduction: role, status, impact of not controlling concurrency Usage: object lock and class lock 7 cases of multithreaded access synchronization method Nature: reentrant, non interruptible Principle: add unlock principle, reentrant principle, visibility principle Defects: low efficiency, not flexible enough, unable to predic ...

1, Introduction HashMap is implemented by hash table, with key/value storage structure. Each key corresponds to a unique value. The speed of query and modification is very fast, and can reach the average time complexity of O(1). It is non thread safe and does not guarantee the storage order of elements; 2, Inheritance class diagram hashMap im ...

1.2 annotation reflection and dynamic proxy 1.2.1 reflection Reflective entry Java lang.Class Objects in daily development are divided into two types: basic type and reference type Basic type, (8 fixed) Integer: byte, short, int, long Decimal: float, do ...

1, Environment installation and deployment 1. Install JDK 2. Configure environment variables C:\Program Files\Java\jdk1.8.0_152\bin 3. Install and activate IDEA -javaagent:D:\IntelliJ IDEA\IntelliJ IDEA 2019.3.1\bin\jetbrains-agent.jar 4. Build a web project 5. Install tomcat server Configure the IDEA to reco ...

1. Quote There are the following requirements to ensure account Thread safety of withdraw withdrawal method interface Account { /** * Get balance * * @return Integer balance */ Integer getBalance(); /** * withdraw money * * @param amount Withdrawal amount */ void withdraw(Integ ...

1. Overview As shown in the figure, thread safe collection classes can be divided into three categories Legacy thread safe collections such as Hashtable and Vector Thread safe Collections decorated with Collections, such as: Collections.synchronizedCollection Collections.synchronizedList Collections.synchronizedMap Collecti ...

preface Java - IO stream Foundation Buffer stream Byte buffer stream: BufferedInputStream, BufferedOutputStreamCharacter buffer stream: BufferedReader, BufferedWriter The basic principle of buffered stream is that when creating stream objects, a built-in buffer array of default size will be created to reduce the number of system IO thro ...

Concept: Idempotency, in popular terms, is an interface that initiates the same request multiple times. It must be ensured that the operation can only be executed once For example: Order interface, cannot create order more than oncePayment interface. You can only deduct money once for repeated payment of the same orderThe callback interface ...

Reproduced in the original text: Introduction to Netty and detailed explanation of NIO_ dzyls' notes - CSDN blog catalogue Introduction to Netty netty concept Noun concept netty application scenario Basic description of I/O model Basic description of I/O model There are three network programming models I/O modes supported by Java: Java ...