In -depth understanding of the principle and mechanism of the Java transaction API framework
In -depth understanding of the principle and mechanism of the Java transaction API framework
Abstract: transaction processing is a key part of many application development, which ensures the consistency and integrity of data.Java provides a powerful API framework that enables developers to manage and handle affairs in a simple and consistent way.This article will explore the principles and mechanisms of the Java transaction API framework, and introduce its usage and working principles through the example code.
1. The concept of transaction
Affairs is a logical unit of a series of database operations. By binding these operations in an atomic operation, it can ensure that they are either successfully executed or rolled back.This mechanism ensures the consistency and integrity of data, and provides reliable error recovery and data consistency guarantee for application development.
2. Java Affairs API
Java provides a uniform transaction API, including the following main interfaces and classes:
-` javax.transaction.usertransaction`: provides a way to start, submit and roll back transactions.
-` javax.transaction.transaction`: indicate the abstract concept of a transaction that can obtain the status and control of transactions.
-` javax.transaction.transactionManager`: Responsible for the life cycle of management affairs, and provide transaction management services for applications.
-`javax.transaction.transactionSynchronizationRegistry`: Allows the application to register the transaction synchronization object in order to perform related operations when the transaction is submitted or rolled back.
3. Use examples
The following is a simple example to demonstrate how to use the Java transaction API.
import javax.transaction.*;
public class TransactionExample {
public static void main(String[] args) {
try {
// Get the transaction manager
TransactionManager transactionManager = com.arjuna.ats.jta.TransactionManager.transactionManager();
// Starting transaction
transactionManager.begin();
// Execute some database operations
// ...
// Submit a transaction
transactionManager.commit();
} catch (Exception e) {
// Treatment abnormalities and roll back transactions
transactionManager.rollback();
e.printStackTrace();
}
}
}
In the above example, we first obtained the transaction manager object, and then started a transaction by calling the `Begin ()` method.Database operations that need to be managed in transactions, including additional, deletion, modification investigation.Finally, call the `Commit ()" method in the `Try-Catch` block to submit transactions.If abnormalities occur during transaction, we will capture abnormalities and call the `Rollback ()` method to roll back the transaction.
4. Principles and mechanisms of affairs
The underlying mechanism of the Java transaction API is achieved through the Java Transaction API (JTA).JTA defines a set of standard interface and behavioral specifications to manage and control distributed transactions.JTA provides a transaction manager to track and coordinate various resource managers participating in affairs.
The transaction manager is responsible for coordinating the transaction operation of the resource manager, and the two-stage submission protocol (TWO-PHASE Commit Protocol) to ensure the consistency of distributed transactions.In the two -stage submission agreement, the transaction manager will coordinate the status of the participants and finally decide whether to submit or roll back.
5. Summary
This article deeply explores the principles and mechanisms of the Java transaction API framework, and demonstrates how to use the transaction API for transaction management through the example code.The Java transaction API provides a simple and powerful interface and class, allowing developers to handle and manage affairs in a consistent way.Understanding the concept of affairs and the specific principles of using the Java transaction API will help developers write reliable and applied applications with transaction mechanisms.
