Bitronix Transaction Manager :: core framework introduction and usage guide

Bitronix is a Java transaction manager used to manage transactions in distributed applications.Bitronix provides a strong set of transaction management API that can achieve coordination and control of distributed transactions.This article will introduce the core framework of Bitronix Transaction Manager. ## Bitronix Transaction Manager core framework The core framework of Bitronix Transaction Manager consists of the following important components: 1. Transaction Manager: Responsible for the implementation of coordination and controlling distributed transactions.The transaction manager acts as a central coordinator in the application, coordinates participants with different resources to perform transactions, and rolls or submit when needed. 2. Transaction log: It is used to record the execution status and related information of transactions to ensure the durability and recovery of the transaction.The transaction log is usually saved on the disk to prevent the data loss when the system fails or collapse. 3. Resource Manager: Responsible for managing resources related to affairs, such as database connections, message queues, etc.The resource manager serves as a participant in transactions, collaborates with the transaction manager, and executes operations related to affairs. 4. Transaction Partics: Participate in various resources for the implementation of distributed transactions.Affairs participants can be databases, message queues, etc. ## Bitronix Transaction Manager ### 1. Introduction to Bitronix dependencies First of all, you need to add Bitronix dependencies to the application tool (such as Maven).Bitronix can be introduced in the following way: <dependency> <groupId>bitronix</groupId> <artifactId>btm</artifactId> <version>2.1.4</version> </dependency> ### 2. Configure Bitronix Transaction Manager Configure the Bitronix Transaction Manager requires creating a configuration file (such as `Bitronix-Resources.properties`) and load the configuration when the application starts.Configuration file examples are as follows: resource.ds1.className=bitronix.tm.resource.jdbc.lrc.LrcXADataSource resource.ds1.driverProperties.driverClassName=com.mysql.jdbc.Driver resource.ds1.driverProperties.url=jdbc:mysql://localhost:3306/database resource.ds1.driverProperties.user=username resource.ds1.driverProperties.password=password resource.ds1.allowLocalTransactions=true resource.ds1.deferConnectionRelease=true In the above configuration file, we define a database resource (DS1), which specifies the connection information of the database. ### 3. Initialize Bitronix Transaction Manager When the application starts, the Bitronix Transaction Manager needs to be initialized.The initialization can be completed in the following way: import bitronix.tm.TransactionManagerServices; // Initialize Bitronix Transaction Manager TransactionManagerServices.getConfiguration().setServerId("myApplication"); TransactionManagerServices.getTransactionManager(); In the above code, we use the initialization of the Bitronix Transaction Manager with the `TransactionManagerserVices" class.Use the `setServerid ()` method to set the unique identifier of the application, and use the method to obtain the instance of the transaction manager with the method of `GettransactionsActionManager ()`. ### 4. Execute distributed transactions Once the Bitronix Transaction Manager is successfully initialized, we can use its API to perform distributed transactions.The following is an example code: import bitronix.tm.BitronixTransactionManager; import bitronix.tm.TransactionManagerServices; import javax.transaction.TransactionManager; import javax.transaction.UserTransaction; import javax.naming.InitialContext; // Get the transaction manager TransactionManager transactionManager = TransactionManagerServices.getTransactionManager(); UserTransaction userTransaction = (UserTransaction) new InitialContext().lookup("java:comp/UserTransaction"); try { // Open transaction userTransaction.begin(); // Execute transaction operation // Submit a transaction userTransaction.commit(); } catch (Exception e) { // Roll back transactions userTransaction.rollback(); } finally { // Close the transaction manager ((BitronixTransactionManager) transactionManager).shutdown(); } In the above code, we use the instance of the transaction manager using the `TransactionManageerserViceserViceS` class, and use the` userTransaction` interface to control the transaction.Use the `Begin ()` method to start a transaction, the method to submit transactions, and the method of roll back the transaction.Finally, use the `Shutdown ()` method to close the transaction manager. The above is the core framework introduction and usage guide of Bitronix Transaction Manager.By using Bitronix Transaction Manager, we can easily manage transactions in distributed applications and ensure the consistency and reliability of transactions.