In -depth understanding of the design concept of the API framework in the Java class library

Detailed explanation of the API framework design concept in the Java class library introduction: When developing complex enterprise -level applications, transaction processing is an indispensable part.The purpose of transaction is to ensure the atomic, consistency, isolation and persistence of a set of related operations to ensure the integrity and reliability of the data.In order to manage affairs more conveniently, the Java class library provides some transaction API frameworks. This article will analyze these framework from the perspective of design concepts and give the corresponding Java code example. 1. The basic concept of transaction Before starting the design of the API framework of the API, let's first understand some of the basic concepts of affairs. 1.1 Atomicity Atomicity means that the operation in a transaction is either successfully submitted, or all fails to roll back, and there is no part of the case. 1.2 consistency (consistency) Consistency means that the data in the database must be consistent before and after the execution.In other words, the result of transaction execution must meet the various pre -defined constraints, otherwise the transaction will be rolled back to the previous state. 1.3 Isolation Isolation means that the transaction that is executed cannot be interfered with each other, and each transaction is logically independent.The isolation level of transactions determines the scope and influence of each other's visible data. 1.4 durability Specific means that once the transaction is submitted, the amendment of the database will be preserved for a long time, and even if the system failure occurs, it will not be lost. Second, Affairs API framework design concept The API framework in the Java class library aims to simplify the management and use process of transactions, and provide a method that is easy to integrate and expand to handle transactions.Here are some common transaction API frameworks and their design concepts: 2.1 Java Transaction API (JTA) JTA is a transaction management API on the Java EE platform, which provides comprehensive support for transactions in a distributed environment.JTA realizes the consistency and isolation of the transactions across multiple resource managers by providing access to distributed transaction coordinators, such as Java Transaction Service.JTA uses the design ideas of the command mode, which decouples the management and execution of transactions, and can flexibly switch between different transaction managers. The following is a sample code using JTA: import javax.transaction.UserTransaction; UserTransaction utx = InitialContext.lookup("java:comp/UserTransaction"); utx.begin(); // Execute a series of database operations utx.commit(); 2.2 Spring transaction management The Spring framework provides its own transaction management mechanism.It separates the management of transaction from the business logic code through AOP (facing the cut -off programming) and declaration -type transaction management, making the code clearer and maintainable.Spring affairs management draws on JTA's design ideas and provides a lighter order and flexible solution on it. The following is an example code that uses Spring transaction management: import org.springframework.transaction.annotation.Transactional; @Transactional public void performTransaction() { // Execute a series of database operations } 2.3 Java Persistence API (JPA) JPA is the persistence framework on the Java EE platform. It provides a set of object relationship mapping (ORM) standard, and also includes support for transactions.The design concept of JPA is to simplify the developer's work and transaction management by using annotations or XML configuration. The following is an example code using JPA: import javax.persistence.EntityManager; import javax.persistence.EntityTransaction; EntityManager em = entityManagerFactory.createEntityManager(); EntityTransaction tx = em.getTransaction(); tx.begin(); // Execute a series of database operations tx.commit(); 3. Summary Affairs is an indispensable part of enterprise -level applications. The API framework in the Java class library provides convenient ways to manage and use transactions.This article details the basic concept of transaction and the common transaction API framework design concept, and provides corresponding Java code examples.It is hoped that through the introduction of this article, readers have a deeper understanding of the use and design concept of the API framework.