The principle and implementation of the Fabric3 JOTM transaction manager framework
The principle and implementation of the Fabric3 JOTM transaction manager framework
introduction:
Affairs management is one of the most important functions of any distributed application.It ensures the consistency and reliability of the data, and it can ensure the correctness of the data even if it fails.Java Affairs Manager (JTA) provides developers with a simple and powerful mechanism to manage affairs.In this article, we will introduce the principles of Fabric3 JOTM transaction manager framework and its implementation in Java applications.
1. The principle of the JOTM transaction manager framework:
JOTM (Java Open Transaction Manager) is an open source Java transaction manager, which provides transparent transaction management support for distributed applications.It is built on the JTA specification and uses JTA API to handle the life cycle and state of transactions.JOTM aims to simplify JTA, providing a transaction management solution that is easier to use and deployed.
JOTM's core idea is to simplify transaction management by configuration and tools.It provides a transaction manager independent of the application to operate transactions through integrated containers without the need for the application to have a specific transaction management code.
The implementation principle of JOTM involves the following main components:
1. Transaction Manager: Responsible for the life cycle of management affairs, including the creation, submission and rollback of affairs.The transaction manager is the core component of JOTM, which uses the interface provided by the JTA API to manage and control transactions.
2. Transaction Coordinator: Responsible for the transaction operation of multiple resource managers (such as databases, message queues, etc.) in a distributed environment.In JOTM, the transaction coordinator is implemented through JTA's TransactionSynchronizationRegization interface.
3. Transaction log: Log information used for persistence in transaction operations.The transaction log can be used to recover and roll back the transaction after system failure or collapse.
4. Transaction Participants: Representatives of various resources participating in distributed transactions, such as database connections, message queues, etc.Affairs participants must support JTA's XARESource interface in order to communicate with the transaction coordinator.
5. Transaction Recovery Manager: Responsible for restoring and rolling operations of unfinished transactions after the system restarts.The transaction recovery manager uses transaction logs to determine which transactions need to be restored, and perform corresponding recovery operations through transaction coordinator and transaction participants.
2. The implementation of Fabric3 JOTM transaction manager framework:
Fabric3 is an open source lightweight service component framework that provides rich functions and flexible deployment options for building distributed applications.The Fabric3 JOTM transaction manager framework is a sub -module of the Fabric3 framework to provide JOTM -based transaction management functions.
To use the Fabric3 JOTM transaction manager framework in the Java application, you can configure and use it according to the following steps:
1. Add dependencies: Add the dependencies of Fabric3 JOTM transaction manager framework in the construction configuration file (such as pom.xml).
<dependency>
<groupId>org.fabric3</groupId>
<artifactId>fabric3-transaction-jotm</artifactId>
<version>1.0.0</version>
</dependency>
2. Configure transaction manager: configure the JOTM transaction manager in the application file (such as Fabric3.xml).
<components>
<component name="transactionManager" type="org.fabric3.transaction.jotm.manager.JotmTransactionManager"/>
</components>
3. Declaric transaction participant: declare the resources that need to participate in distributed transactions in the definition of components of the application.
<component name="myComponent">
<resources>
<resource name="database" type="javax.sql.DataSource"/>
<resource name="jms" type="javax.jms.ConnectionFactory"/>
</resources>
</component>
4. Use transaction in the application: By using annotations or programming methods, add corresponding transaction annotations or codes to the method of transaction operation.
For example, use annotations:
@Transactional
public void doTransaction() {
// Execute transaction operation
}
Use programming method:
TransactionManager transactionManager = JNDI.lookup("java:/comp/env/transactionManager");
try {
transactionManager.begin();
// Execute transaction operation
transactionManager.commit();
} catch (Exception e) {
transactionManager.rollback();
throw e;
}
Summarize:
Fabric3 JOTM transaction manager framework provides a convenient and efficient transaction management solution for Java applications by simplifying and integrated JTA API.Its implementation principle involves the core components of JOTM, such as transaction manager, transaction coordinator and transaction log, etc., and provides simple configuration and usage methods.By using the Fabric3 JOTM transaction manager framework, developers can easily handle transaction operations in a distributed environment to ensure the consistency and reliability of data.
references:
-Fabric3 official website: https://www.fabric3.org/
-JOTM official website: https://jotm.github.io/
