Welcome!

Java IoT Authors: Pat Romanski, Elizabeth White, Zakia Bouachraoui, Yeshim Deniz, Jason Bloomberg

Related Topics: Java IoT, Microservices Expo, Machine Learning

Java IoT: Article

Java Application Architecture: Modularity Patterns with Examples

Agile Software Development Series

Finally someone has put the most important software architecture practices into words. Within this book lies the concepts that are the heart of true agility. Without a modularized architecture, any decent size project can not achieve agility. I have seen so many agile projects flop because they ignored architecture, in particular they ignored modularization.

This book also provides the keys concepts needed to ensure modifiability, the number one quality attribute for any architecture. It drives home the importance of physical design. An often overlooked aspect of designing modularity, yet it is the most important. Good logical design does not really matter if you have a poor physical design.

The book is broken down into 3 parts and includes an appendix that gives an overview of the SOLID Principles.

Part 1 The Case for Modularity introduces modularity and how it relates to complexity, architecture, SOA, Reuse, Design Rot, and Technical Debt. Part 1 chapters include Module Defined, Two Facets of Modularity, Architecture and Modularity, Taming the Beast, Realizing Reuse, Modularity and SOA, and Reference Implementation. The last chapter Reference Implementation shows how to apply several of the patterns through a series of refactorings applied to a sample architecture.

The sample did not include OSGi. The reason the author left OSGi out of the picture is that you do not need it to design proper modularized architecture. It is a tool to enhance the runtime experience, not the design experience. I was glad the author took this approach.

Part 2 of the book is the pattern's catalog. I have listed the chapter and the patterns included below.
-Base Patterns: Manage Relationships, Module Reuse, and Cohesive Modules
-Dependency Patterns: Acyclic Relationships, Levelize Modules. Physical Layers, Container Independence , and Independent Deployment
-Usability Patterns: Published Interface, External Configuration, Default Implementation, and Module Facade
-Extensibility Patterns: Abstract Modules, Implementation Factory, and Separate Abstractions
-Utility Patterns: Collocate Exceptions, Levelize Build, and Test Module

The pattern form (sections of the patterns) are Pattern Name, Pattern Statement, a Sketch, Description, Implementation Variations, Consequences, a Sample, and a Wrapping Up section.

Part 3 of the book provides a introduction to OSGi within several contexts. Part 3 chapters include Introducing OSGi, The Loan Sample and OSGi, OSGi and Scala, OSGi and Groovy, and the Future of OSGi.

The author has put up a site that includes a pattern catalog on his site Java Application Architecture: Modularity Patterns.

The author has all the source code available on github. It is organized by sample/pattern name. The code is very well organized and usable.

This book is not only for Java developers. It is a great book for anyone developing object oriented systems. It easily translates to .NET. I was constantly drawing parallels with my experience using PRISM to develop modular .NET applications.

This is a must read for every architect and developer interested in doing architecture right. The concepts in this book will take you to a new level of quality with your architectural designs.

Java Application Architecture: Modularity Patterns with Examples Using OSGi

More Stories By Tad Anderson

Tad Anderson has been doing Software Architecture for 18 years and Enterprise Architecture for the past few.

IoT & Smart Cities Stories
CloudEXPO | DevOpsSUMMIT | DXWorldEXPO are the world's most influential, independent events where Cloud Computing was coined and where technology buyers and vendors meet to experience and discuss the big picture of Digital Transformation and all of the strategies, tactics, and tools they need to realize their goals. Sponsors of DXWorldEXPO | CloudEXPO benefit from unmatched branding, profile building and lead generation opportunities.
DXWorldEXPO LLC announced today that Big Data Federation to Exhibit at the 22nd International CloudEXPO, colocated with DevOpsSUMMIT and DXWorldEXPO, November 12-13, 2018 in New York City. Big Data Federation, Inc. develops and applies artificial intelligence to predict financial and economic events that matter. The company uncovers patterns and precise drivers of performance and outcomes with the aid of machine-learning algorithms, big data, and fundamental analysis. Their products are deployed...
All in Mobile is a place where we continually maximize their impact by fostering understanding, empathy, insights, creativity and joy. They believe that a truly useful and desirable mobile app doesn't need the brightest idea or the most advanced technology. A great product begins with understanding people. It's easy to think that customers will love your app, but can you justify it? They make sure your final app is something that users truly want and need. The only way to do this is by ...
Digital Transformation and Disruption, Amazon Style - What You Can Learn. Chris Kocher is a co-founder of Grey Heron, a management and strategic marketing consulting firm. He has 25+ years in both strategic and hands-on operating experience helping executives and investors build revenues and shareholder value. He has consulted with over 130 companies on innovating with new business models, product strategies and monetization. Chris has held management positions at HP and Symantec in addition to ...
Dynatrace is an application performance management software company with products for the information technology departments and digital business owners of medium and large businesses. Building the Future of Monitoring with Artificial Intelligence. Today we can collect lots and lots of performance data. We build beautiful dashboards and even have fancy query languages to access and transform the data. Still performance data is a secret language only a couple of people understand. The more busine...
The challenges of aggregating data from consumer-oriented devices, such as wearable technologies and smart thermostats, are fairly well-understood. However, there are a new set of challenges for IoT devices that generate megabytes or gigabytes of data per second. Certainly, the infrastructure will have to change, as those volumes of data will likely overwhelm the available bandwidth for aggregating the data into a central repository. Ochandarena discusses a whole new way to think about your next...
Cell networks have the advantage of long-range communications, reaching an estimated 90% of the world. But cell networks such as 2G, 3G and LTE consume lots of power and were designed for connecting people. They are not optimized for low- or battery-powered devices or for IoT applications with infrequently transmitted data. Cell IoT modules that support narrow-band IoT and 4G cell networks will enable cell connectivity, device management, and app enablement for low-power wide-area network IoT. B...
The hierarchical architecture that distributes "compute" within the network specially at the edge can enable new services by harnessing emerging technologies. But Edge-Compute comes at increased cost that needs to be managed and potentially augmented by creative architecture solutions as there will always a catching-up with the capacity demands. Processing power in smartphones has enhanced YoY and there is increasingly spare compute capacity that can be potentially pooled. Uber has successfully ...
SYS-CON Events announced today that CrowdReviews.com has been named “Media Sponsor” of SYS-CON's 22nd International Cloud Expo, which will take place on June 5–7, 2018, at the Javits Center in New York City, NY. CrowdReviews.com is a transparent online platform for determining which products and services are the best based on the opinion of the crowd. The crowd consists of Internet users that have experienced products and services first-hand and have an interest in letting other potential buye...
When talking IoT we often focus on the devices, the sensors, the hardware itself. The new smart appliances, the new smart or self-driving cars (which are amalgamations of many ‘things'). When we are looking at the world of IoT, we should take a step back, look at the big picture. What value are these devices providing. IoT is not about the devices, its about the data consumed and generated. The devices are tools, mechanisms, conduits. This paper discusses the considerations when dealing with the...