Analysis of the core characteristics of the "Affairs JTA" framework in the Java class library
Analysis of the core characteristics of the "Affairs JTA" framework in the Java class library
Overview:
The Java transaction API (JTA) is a standard interface for managing distributed transactions.It provides a mechanism to coordinate the transaction processing of multiple resources (such as databases, message queues, etc.) to ensure that they succeed or fail at the same time.This article will analyze the core features of the "Anti -Affairs JTA" framework in the Java library, and provide some Java code examples to explain.
1. Atomicity:
Affairs is an atomic operation unit, either successfully executed or all failed.The JTA framework uses Two-Phase Commit (2PC) to achieve atomicity.The following is an example of code using the JTA framework:
import javax.transaction.*;
import javax.naming.*;
public class TransactionExample {
public static void main(String[] args) throws Exception {
UserTransaction transaction = (UserTransaction) new InitialContext().lookup("java:comp/UserTransaction");
try {
transaction.begin();
// Execute the operation related to transactions
// Submit a transaction
transaction.commit();
} catch (Exception e) {
// Roll back transactions
transaction.rollback();
e.printStackTrace();
}
}
}
2. consistency (consistency):
The consistency requires that the data in the database before and after the execution of the transaction must be consistent.The JTA framework supports the operation of the operation of multiple data sources (such as multiple databases) in a distributed transaction.If one of the data sources fails the transaction failure, all other data sources will roll back to the state before the start of the transaction.
3. Isolation:
The isolation of transactions requires that each transaction should be isolated when performing concurrent execution and does not interfere with each other.The JTA framework provides configurable isolation levels, such as Read Uncommitted, Read Community, Repeating (Repeatable Read), and Serializable.The following is an example of setting the isolation level:
import javax.transaction.*;
import javax.naming.*;
public class TransactionExample {
public static void main(String[] args) throws Exception {
UserTransaction transaction = (UserTransaction) new InitialContext().lookup("java:comp/UserTransaction");
try {
// Set the isolation level as the repeated readable
transaction.setTransactionIsolation(Connection.TRANSACTION_REPEATABLE_READ);
transaction.begin();
// Execute the operation related to transactions
// Submit a transaction
transaction.commit();
} catch (Exception e) {
// Roll back transactions
transaction.rollback();
e.printStackTrace();
}
}
}
4. Durability:
When the transaction is successfully submitted, the result should be permanently preserved in the persistent storage medium, and it will not be lost even if the system failure occurs.This requires the use of the JTA framework to interact with the reliable persistent storage medium (such as database) to ensure the durability of the transaction.
Summarize:
The JTA framework provides a simple and powerful tool for Java developers to handle distributed transactions.Its core characteristics include atomic, consistency, isolation and durability.Through reasonable use of the JTA framework, developers can ensure that the transaction processing of multiple resources is successful or failed at the same time to ensure the consistency and reliability of the system data.
Please note that the Java code example provided herein is only used to explain the purpose. Under actual situation, appropriate modification and adjustment may be required according to specific requirements.
