Java XA Distributed Transactions

XA distributed transactions obviously occur on multiple dbs,

 

Java XA distributed transactions are implemented as follows:

Dependency jar package:

<dependency>
			<groupId>com.atomikos</groupId>
			<artifactId>transactions-jdbc</artifactId>
			<version>3.9.3</version>
		</dependency>
		<dependency>
			<groupId>javax.transaction</groupId>
			<artifactId>jta</artifactId>
			<version>1.1</version>
		</dependency>

 

The Java code is as follows:

 

import java.sql.Connection;
import java.sql.PreparedStatement;

import javax.sql.XAConnection;
import javax.transaction.xa.XAResource;
import javax.transaction.xa.Xid;

import com.atomikos.icatch.jta.UserTransactionManager;
import com.atomikos.jdbc.AtomikosDataSourceBean;
import com.mysql.jdbc.jdbc2.optional.MysqlXADataSource;
import com.mysql.jdbc.jdbc2.optional.MysqlXid;

public class DataSourceTools {
	
	protected static MysqlXADataSource getMysqlXADataSource1() {
		MysqlXADataSource mysqlXADataSource = new MysqlXADataSource();
		mysqlXADataSource.setURL("jdbc:mysql://127.0.0.1:3306/db1");
		mysqlXADataSource.setUser("root");
		mysqlXADataSource.setPassword("1");
		return mysqlXADataSource;
	}

	protected static MysqlXADataSource getMysqlXADataSource2() {
		MysqlXADataSource mysqlXADataSource = new MysqlXADataSource();
		mysqlXADataSource.setURL("jdbc:mysql://127.0.0.1:3306/db2");
		mysqlXADataSource.setUser("root");
		mysqlXADataSource.setPassword("1");
		return mysqlXADataSource;
	}

	public static AtomikosDataSourceBean getXADataSource1() {
		AtomikosDataSourceBean dataSourceBean = new AtomikosDataSourceBean ();
		dataSourceBean.setUniqueResourceName("dn1");
		dataSourceBean.setXaDataSource(getMysqlXADataSource1());
		dataSourceBean.setXaDataSourceClassName("com.mysql.jdbc.jdbc2.optional.MysqlXADataSource");
		return dataSourceBean;
	}

	public static AtomikosDataSourceBean getXADataSource2() {
		AtomikosDataSourceBean dataSourceBean = new AtomikosDataSourceBean ();
		dataSourceBean.setUniqueResourceName("dn2");
		dataSourceBean.setXaDataSource(getMysqlXADataSource2());
		/*
		 * Properties xaProperties = new Properties();
		 * xaProperties.setProperty("url",
		 * "jdbc:mysql://10.0.0.104:8066/TESTDB");
		 * xaProperties.setProperty("user", "user");
		 * xaProperties.setProperty("password", "user");
		 * dataSourceBean.setXaProperties(xaProperties);
		 */
		dataSourceBean.setXaDataSourceClassName("com.mysql.jdbc.jdbc2.optional.MysqlXADataSource");
		return dataSourceBean;
	}

	public static UserTransactionManager getUserTransactionManager() throws Exception {
		return new UserTransactionManager();
	}

	public static void main(String[] args) throws Exception {
		AtomikosDataSourceBean atomikos1 = getXADataSource1 ();
		AtomikosDataSourceBean atomikos2 = getXADataSource2 ();
		XAConnection xaCon1 = atomikos1.getXaDataSource (). GetXAConnection ();
		XAConnection xaCon2 = atomikos2.getXaDataSource (). GetXAConnection ();
		Connection conn1 = xaCon1.getConnection();
		Connection conn2 = xaCon2.getConnection();
		XAResource xaResource1 = xaCon1.getXAResource();
		XAResource xaResource2 = xaCon2.getXAResource();
		Xid xid1 = new MysqlXid(new byte[]{0x01}, new byte[]{0x02} , 0) ;
		Xid xid2 = new MysqlXid(new byte[]{0x01}, new byte[]{0x03}, 0);
		
		try {
			xaResource1.start(xid1, XAResource.TMNOFLAGS);
			PreparedStatement ps1 = conn1.prepareStatement("INSERT INTO tb_role(NAME,available) VALUES('3' , 2)");
			ps1.executeUpdate() ;
			xaResource1.end(xid1, XAResource.TMSUCCESS);
			
			xaResource2.start(xid2, XAResource.TMNOFLAGS);
			PreparedStatement ps2 = conn2.prepareStatement("INSERT INTO tb_role(NAME,available) VALUES('4' , 1)");
			ps2.executeUpdate() ;
			xaResource2.end(xid2, XAResource.TMSUCCESS);
			
			int prepare1 = xaResource1.prepare( xid1 ) ;
			int prepare2 = xaResource2.prepare( xid2 ) ;
			
			if(prepare1 == XAResource.XA_OK && prepare2 == XAResource.XA_OK){
				xaResource1.commit(xid1, false);
				System.out.println("suc1");  
				xaResource2.commit(xid2, false);
				System.out.println("suc2");
			}else{
				System.out.println("rollback");
				xaResource1.rollback(xid1);
				xaResource2.rollback(xid2);
			}
		} catch (Exception e) {
			e.printStackTrace ();
			xaResource1.rollback(xid1);
			xaResource2.rollback(xid2);
		}
	}
}

 mysql XA transaction writing

mysql> XA START 'xatest';
Query OK, 0 rows affected (0.00 sec)

mysql> INSERT INTO mytable (i) VALUES(10);
Query OK, 1 row affected (0.04 sec)

mysql> XA END 'xatest';
Query OK, 0 rows affected (0.00 sec)

mysql> XA PREPARE 'xatest';
Query OK, 0 rows affected (0.00 sec)

mysql> XA COMMIT 'xatest';
Query OK, 0 rows affected (0.00 sec)