Skip to main content

Integration Project- Micro Services Migration Story with JBoss BPM Travel Agency - Part Four

Part Four- Persistence with JPA

In the post, I am going to show you how to create the fuse side travel agency demo from scratch. We are going to take a look at how create the Flight/Hotel booking and cancellation service. If you would like to know more about the micro service architecture this demo is trying to showcase, please go to part 2 of the series
for more information. Due to the fact that Flight and Hotel booking are identical, I will be focusing on the Hotel side. What this service does, is it simply books the hotel when receives a an ID when the booking is done, it'll return a 26 character BookingID as key. This key is then used if the user wants to cancel the booking. As for cancellation, it'll return the cost to cancel it, if the key provided is not found, it'll return 0, as nothing can be cancelled using the key provided.

All request to backend services in this demo are all async, so there are different message queue in the broker connecting to the promotion, booking and cancellation services. For booking service we are going to create an JPA entity contains the booking ID we have received from the process then store the entity to it's table. And in cancellation, it first check if the the booking id exists in the table, if yes, it'll calculate the fee and return it. If nothing found, then a constant number "zero" will return.



We need to first configure the two endpoints from message broker and database.
Like in normal JPA application, first we will need to identify our entities, in this case, we have two, booking entity and cancel booking entity.
package org.blogdemo.travelagency.hotelbookingservice;

import static javax.persistence.LockModeType.PESSIMISTIC_WRITE;

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQuery;
import javax.persistence.Table;

@Entity
@NamedQuery(name = "queryHotelBookingById", query = "select hotelbooking from Booking hotelbooking where hotelbooking.bookingid=:bookingid " , lockMode = PESSIMISTIC_WRITE)
@Table(name = "hotelbooking")
public class Booking { 
 @Column(name = "bookingid")
 @Id
 String bookingid;
 
 @Column(name = "recieveDate")
 Date recieveDate;

 public String getBookingid() {
  return bookingid;
 }

 public void setBookingid(String bookingid) {
  this.bookingid = bookingid;
 }

 public Date getRecieveDate() {
  return recieveDate;
 }

 public void setRecieveDate(Date recieveDate) {
  this.recieveDate = recieveDate;
 }

}


package org.blogdemo.travelagency.hotelbookingservice;
import java.util.Date;
import javax.persistence.*;
@Entity
@Table(name = "cancelhotelbooking")
public class CancelBooking {
 @Column(name = "bookingid")
 @Id
 String bookingid;
 
 @Column(name = "recieveDate")
 Date recieveDate;

 public String getBookingid() { bookingid;
 public void setBookingid(String bookingid) {
  this.bookingid = bookingid;
 }
 public Date getRecieveDate() { recieveDate;}
 public void setRecieveDate(Date recieveDate) {
  this.recieveDate = recieveDate;
 }
}


And then we need to set the datasource and bean information. Under resource/META-INF create a xml file called persistence.xml. This file contains the database setting, login authentication, and depend on the JPA library you use, there are minor difference when you want to configure the behavior of how it should sync with database. I am using OpenJPA this time.

  
    org.blogdemo.travelagency.hotelbookingservice.Booking
    org.blogdemo.travelagency.hotelbookingservice.CancelBooking
      
       
        
       
       
       
       
       
        
    

1. Meesage broker location and authentication

    
  
  



2. Entity and Transaction managers, and also the datasource setting like normal JPA applications     CAUTION,   
(In Fuse, it's best to use hibernate and Aries JTA.  I will migrate this project in Fuse 6.2)

  
  


  

   
  
  
    
  

 

For booking, because we need to insert a new entity, therefore create a service to handle the creation of the entity.And inside booking service it also handles all the necessary business logic such as generate random booking id and calculating the cancelation fee. Then we need to register the service bean And create the route to book hotel
Create route to cancel booking


Detail instructions are here:

 

For more detail side in BPM Suite, please click here to Eric Schabell's post.

Micro Services Migration Story with JBoss BPM Travel Agency

  Part One: Introduction and Installation
  Part Two: Moving towards Microservices
  Part Three: Retrieving Data with JDBC 
  Part Four: Persistence with JPA

Comments

Popular posts from this blog

Fuse Integration Service - Setup JBDS and create first quickstart application

Before we go and start creating our first application, I want to show you how to setup your JBoss Developer Studio, create a small application from the quickstart example and then running it on Fuse Integration Service.

I am using JBoss Developer Studio version 9, you can find it here.
After download the

jboss-devstudio-9.0.0.GA-installer-eap.jar
double-click it, and start installing with default values.

After successful installation, we will need install the plugins for Fuse, on JBoss Central view, select software update, select enable early access.


And select JBoss Fuse Development for the plugin,


Click on install, and we are all set to go!

First thing first, we want to create a Fuse project to deploy on the base of Fuse Integration Service, which is OpenShift. If you have not installed it, please go back to my previous post for instructions. So on your JBDS, right click and start creating the project. Select new, maven project, if you have installed the plugin correctly, you should …

RHTE - Supercharge your integration services

Red Hat Tech Exchange has taken place in Vietnam, Ho Chi Minh city two weeks ago, it is a great event held by Red Hat in Asia Pacific Region. It is open to all Red Hat partners who are interested in learning what Red Hat is doing recently, see what the trend of the open source world, basically it is a great event to share your knowledge and experience, to meet other enthusiastic people.

I am very fortunate to talk in this great event, to talk about the things I have been working on and even discuss it with many. Also got lots of great ideas too. So here are the slide.

My first talk was with Thomas Qvarnström about how to handle large size data in JBoss Fuse and how JBoss Data Grid can help in the situation.

Here is the agenda of the talk, we will be talk about this in the up coming webinar on 24th Sept.

Integration often involves storing, retrieving, and transforming data. Using a traditional database in your integration is likely to becomes a bottleneck that is expensive and hard to …

Red Hat JBoss Fuse/A-MQ - Fuse and A-MQ Version 6.3 GA is released!

Fuse and A-MQ 6.3 GA has just went out. Maybe, you would think this is just only a minor version release why should I care? Hold your thoughts on that! Because they have done a lot of improvements and also added many new features into this release.

Besides various bug fixes and making sure Fuse Fabric is much more stable. There are two major change in this version update:

New Tooling in JBoss Developer Studio (JBDS) 9.1 GA. Newer Apache Camel version – Camel v2.17. I was really impressed by the work put in to make developing Camel application much simpler. First is the installation of tooling itself. Now it has a all-in-one installer so you don't need to worry about which plugins you need to check. See the videos below to see the new "Getting Started" of Fuse 6.3.



And If you notice from the above video, the presentation of camel route in JBDS has also updated. It fixed some of the miss representation of logic and making it easier to read.

Old Camel Route
New Camel Route
On …