Learn to understand the working principle of the "Affairs JTA" framework in the Java class library

Anthology JTA (Java Transaction API) framework is an important component for managing distributed transactions in the Java class library.It provides a mechanism for Java applications to ensure that the operation of multiple resources (such as databases, message queues, etc.) is performed in atomic ways, that is, all success or all fails. The working principle of the JTA framework is based on two key concepts: transaction manager and resource manager.The transaction manager is responsible for coordinating and managing affairs, and the resource manager is responsible for managing the transaction processing of specific resources. The working principle of the JTA framework will be introduced in detail below. 1. Registered transaction manager: In the Java application, you first need to register a transaction manager through the JTA framework.The transaction manager is responsible for coordinating and controlling the execution process of the entire distributed transaction. TransactionManager tm = com.arjuna.ats.jta.TransactionManager.transactionManager(); 2. Starting transaction: Once the transaction manager is registered successfully, you can start a new transaction by calling the `Begin` method. tm.begin(); 3. Get resource manager: Next, you need to obtain a resource manager who wants to participate in transactions.The resource manager can be a database connection, message queue, and so on. DataSource DataSource = // Initialized data source XAResource xar = dataSource.getXAResource(); 4. Registration resources: By calling the `Gettransaction 'method of the transaction manager, the resource manager is registered into the current transaction. Transaction txn = tm.getTransaction(); txn.enlistResource(xar); 5. Executive business logic: In affairs, you can perform various business logic and operations.The operations on all resource managers will be performed in the same transaction. // Execute the database operation Connection conn = dataSource.getConnection(); // ... PreparedStatement pstmt = conn.prepareStatement("INSERT INTO table_name VALUES (?, ?)"); pstmt.setInt(1, value1); pstmt.setString(2, value2); pstmt.executeUpdate(); 6. Submit or roll back transactions: Once all business logic is executed, you can choose to submit or roll the transaction. // Submit a transaction tm.commit(); // or roll back transactions tm.rollback(); The JTA framework has achieved the management and control of distributed transactions through registered transaction managers and resource managers, and uniformly coordinated the operation of multiple resources.Throughout the transaction, if any resource error or failure occurs, the JTA framework will roll back all operations to ensure the consistency and integrity of the data. It should be noted that when using the JTA framework, it is necessary to ensure that all the resources of participating transactions can provide the implementation of the XARESource interface to interact with the transaction manager. To sum up, the JTA framework is an important component for handling distributed transactions in the Java class library.Through the registration of the transaction manager, the acquisition and registration of resource manager, and the implementation of business logic, the JTA framework can ensure that the operation of multiple resources is performed by atomic.This provides convenient and powerful tools for the development of large -scale, distributed Java applications. I hope this article can help you understand the working principle of the "JTA" framework in the Java class library!