Byron Kiourtzoglou

About Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Messaging principals in Java applications

Messaging is a crucial aspect of every Java application, especially for applications involving Enterprise Application integration (EAI) or separation of concerns, such us multi-tier WEB applications.

Messaging can be separated in two main categories, synchronous and asynchronous. With synchronous messaging the initiator of a conversation waits for a replay to each submitted request, on the other hand, in asynchronous messaging the initiator is not interested for the replay. The most common and efficient way for Java processes to communicate in a synchronous manner is through Remote Method Invocation (RMI). Asynchronous communication is mainly implemented using Java Messaging Service (JMS).

This post presents a design pattern concerning asynchronous communication between Java processes for low latency and high throughput applications.

As mentioned above JMS is considered to be the “de facto” standard for asynchronous application messaging. Nevertheless JMS introduces a noticeable increase in latency due to internal checks and procedures involved to the message exchange life-cycle (even for in memory brokers). Our preferred way to handle asynchronous messaging for achieving low latency and high throughput is :

  • If persistence is mandatory, then the best approach is to use JMS persistent queues or topics
  • If persistence is not mandatory then you should implement asynchronous messaging as follows :
    • Message container should be a List, preferably the ArrayList implementation or a Map, preferably the HashMap Implementation
    • Sender processes should perform synchronized access, using the synchronized block, to insert messages to the container
    • Implement a pool of receiver processes that access the message container synchronously, using the synchronized block, and retract messages
    • Messages can be implemented in many flavors, our preferred method is Plain Old Java Objects (POJOs) implementing the Externalizable interface so at to manually handle the serialization process.
Related Whitepaper:

Functional Programming in Java: Harnessing the Power of Java 8 Lambda Expressions

Get ready to program in a whole new way!

Functional Programming in Java will help you quickly get on top of the new, essential Java 8 language features and the functional style that will change and improve your code. This short, targeted book will help you make the paradigm shift from the old imperative way to a less error-prone, more elegant, and concise coding style that’s also a breeze to parallelize. You’ll explore the syntax and semantics of lambda expressions, method and constructor references, and functional interfaces. You’ll design and write applications better using the new standards in Java 8 and the JDK.

Get it Now!  

Leave a Reply


− 6 = three



Java Code Geeks and all content copyright © 2010-2014, Exelixis Media Ltd | Terms of Use
All trademarks and registered trademarks appearing on Java Code Geeks are the property of their respective owners.
Java is a trademark or registered trademark of Oracle Corporation in the United States and other countries.
Java Code Geeks is not connected to Oracle Corporation and is not sponsored by Oracle Corporation.

Sign up for our Newsletter

15,153 insiders are already enjoying weekly updates and complimentary whitepapers! Join them now to gain exclusive access to the latest news in the Java world, as well as insights about Android, Scala, Groovy and other related technologies.

As an extra bonus, by joining you will get our brand new e-books, published by Java Code Geeks and their JCG partners for your reading pleasure! Enter your info and stay on top of things,

  • Fresh trends
  • Cases and examples
  • Research and insights
  • Two complimentary e-books