Articles

How to Optimize a PDF in Java

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As we have discussed before, the PDF is the ideal file format for saving, sharing, and protecting documents, both small and large. Its high compatibility with most Operating Systems makes it popular amongst most users for sharing information with different parties. Furthermore, it provides a more static platform for working with important documents like contracts and manuals, as steps can be taken to prevent any unwanted access or editing to the file. 

With large and highly complex files like this, however, different systems may have difficulty uploading, downloading, and reading the formatting for your document. This can lead to file corruption or increased loading times that can halt productivity. Thus, streamlining large PDF files can greatly benefit organizations that regularly use this format in day-to-day operations. 

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Leveraging CloudAMQP Within My Heroku-Based SaaS Solution

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In the « Using Heroku to Quickly Build a Multi-Tenant SaaS Product » article, I documented the foundation for a new SaaS solution that I am building (initially for my sister-in-law) — utilizing the Heroku ecosystem. Using Heroku allowed me to deploy the app quickly, without having to worry about infrastructure, DevOps, scalability when the app gets popular, etc. The « Integrating Twilio Into My SaaS Solution In Heroku » publication provided an example of how easy it is to create a Twilio instance and integrate the solution into my Fitness-based SaaS solution. This current journey has resulted in a feature set that both trainers and their clients have been able to enjoy.

This article is going to focus on invoicing clients for services that have been performed and will utilize messaging solutions within the Heroku ecosystem. The goals of the invoice process are as follows:

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How to Create an AWS Continuous Deployment Pipeline

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Creating a continuous deployment pipeline will bring us a step closer to an automated build, test, deploy strategy. In order to create such a pipeline, we need to have access to several tools. Instead of installing these on on-premise servers, we can make use of the AWS cloud offer. Let’s see how this can be accomplished!

1. Introduction

We want to create an automated pipeline in order to ensure that no manual and error prone steps are required for building, testing and deploying the application. When a failure occurs during one of these steps, we will be automatically notified and can take necessary actions in order to resolve the issue.

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How To Test PDF Files Using Selenium Automation?

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PDF documents are small-sized, highly secure files. Almost all businesses use PDFs for processing their files. The reason being a distinguishing feature of maintaining format regardless of the tool used to access PDF files. It’s no surprise that all our invoices, official documents, contractual documents, boarding pass, bank statements, etc. are usually in PDF format.

Even as developers, we come across scenarios when a PDF file needs to be verified or used to locate certain parts of data. You can either do this manually given that you have loads of time to spare or you opt for automation testing. When it comes to handling tricky components of such files using automation, it might seem a bit too tricky. But that’s not the case. Selenium test automation can make it really easy to test PDF file formats.

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Implement a Distributed Database to Your Java Application

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Brief Description

Interference is a simple java framework that enables you to run a distributed database service within your java application, using a JPA-like interface and annotations.

The basic unit of the interference service is a node — in fact, it is a java application, inside which a service instance is running.

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7 Tips to Achieve High-Availability(HA) For Your Maven Repository

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Cloud Computing has emerged as a novel technology today. Every company is a software company today, and it is evident that no company can service without using the power of cloud computing. The cloud is seen as a conceptual layer on the Internet, making all available software and hardware resources transparent, rendering them accessible through a well-defined interface. 

As the companies are increasingly relying on these cloud computing services to be always stable and accessible whenever their customers need them, the services and applications’ downtime is highly unacceptable. In this article, we will be discussing the concepts related to high availability (HA), what it is, how it works, and how companies can take advantage of this. 

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Spring Boot: Handle AWS RDS Password Change or Rotation Without Restarting

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This article is about how you can handle AWS RDS secrets rotation without restarting your Spring Boot application.

I had this problem wherein I had to update my database connection whenever the database password was updated for my AWS RDS instance. This can be because of a monthly password rotation policy or may be the database credentials got compromised and you want all your running applications to keep running even when the database password are changed.

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Ports and Adapters Architecture With Kafka, Avro, and Spring-Boot

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In this post, we will be implementing a Kafka Producer and Consumer using the Ports and Adapters (a.k.a. Hexagonal) architecture. We will also be using the KafkaAvroSerializer to send specific Avro types using Kafka and the Kafka Schema Registry.

Overall Flow

The overall workflow is something like this: a domain object (Person.java) is sent from BusinessDomainService to Kafka where it gets serialized to Avro object (PersonDto.java); which is then consumed from the Kafka topic via a Kafka Consumer and translated from Avro object (PersonDto.java) back to domain object (Person.java) before being sent back to BusinessDomainService for some arbitrary post-processing.

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State Design Pattern In Java

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State Design Pattern — a behavioral design pattern that allows an object to change its behavior when its internal state changes.

State Design Pattern

  • The State Design Pattern is a Behavioral Design Pattern and one of the Gang of Four design patterns. 
  • The State allows an object to alter its behavior when its internal state changes.
  • The State pattern is similar to the concept of finite-state machines.
  • The State pattern is also similar to the Strategy Design Pattern which provides a way to switch a strategy through invocations of methods defined in the pattern’s interface.
  • The State pattern encapsulates varying behavior for the object based on its internal state change.
  • The State pattern provides a cleaner way for an object to change its behavior at runtime.
  • By using the State pattern, the object changes its behavior when its internal state changes.
  • If we implement State-Specific behavior directly in the class, then we will not be able to change it without modifying the class.
  • In-State pattern, State-specific behavior should be defined independently because adding new states should not affect the behavior of existing states.
  • The context class delegates state-specific behavior to its current state object instead of implementing state-specific behavior directly.
  • This allows us to make our context class independent of how state-specific behavior is implemented. New state classes can be added without modifying context class.
  • The context class can change its behavior at run-time by changing its current state object.
  • To implement the State Design Pattern, we create a State interface to define some action. And then concrete classes that represent various states and a context object whose behavior varies as its state object changes.
  • The mixer in the kitchen is a good example of a state pattern, which has a motor and a control interface. Using the knob we can increase/decrease the speed of the mixer. Based on the speed state the behavior changes.
  • The TV which can be operated with a remote controller is another example of a State pattern. We can change the state of the TV by pressing buttons on the remote. But the state of TV will change or not, it depends on the current state of the TV. If the TV is switched OFF then only possible next state can be switch ON. And if TV is ON, we can switch it OFF, mute, or change aspects and source. But if TV is OFF, nothing will happen when we press the remote buttons. 
  • Java Threads are another good example of State pattern since they have defined states as New, Runnable, Blocked, Waiting, Timed Waiting and Terminated. 

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Why You Should Join EclipseCon Community Day

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EclipseCon Community Day is on Monday, October 19 14:00 to 18:00 CET (the day before the start of the main EclipseCon conference). Community Day at EclipseCon has always been a great event for Eclipse working groups and project teams. This year both EclipseCon and Community Day is virtual and free. Space for Community Day is limited, so please register and save your spot soon.

We have a packed agenda centered on the Jakarta EE, MicroProfile and Cloud Native Java communities. If there is a set of very focused sessions you should attend on these topics, the agenda offers the one place this year to do so. The sessions are intended not only for learning, but also for the community to actively engage with some key leaders. Note, after you register for EclipseCon, you will need to reserve your spot for Community Day through the Swapcard platform (let me know if you run into any issues).

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