Java EE 8 Design Patterns and Best Practices

Implementing the Transaction class

The Transaction class is responsible for controlling the transaction lifecycle and defining the transaction delimit:

package com.packt.javaee8.domainstore;import javax.annotation.PostConstruct;public class Transaction {    private boolean opened;    @PostConstruct    public void init(){        this.opened = false;    }    public void commit() throws Exception {        if( !opened ) throw new Exception("Transaction is not opened");        opened = false;    }    public void rollback() throws Exception {        if( !opened ) throw new Exception("Transaction is not opened");        opened = false;    }    public void begin() throws Exception {        if( opened ) throw new Exception("Transaction already is opened");        opened = true;    }    public boolean isOpened(){        return opened