Welcome!

Microservices Expo Authors: Pat Romanski, Elizabeth White, Steve Wilson, Stackify Blog, Derek Weeks

Related Topics: Microservices Expo

Microservices Expo: Article

SOA Patterns: Basic Structural Patterns - Part 1

Solving some of the more common issues related to services

This article is based on the book SOA Patterns (http://www.manning.com/rotem) scheduled to print February 2009. This article is courtesy of Manning Publications (http://www.manning.com). The ebook is available and sold exclusively through Manning Publications.

Service-oriented architecture (SOA) has become the leading solution for complex, connected business systems. While it's easy to grasp the theory of SOA, implementing well-designed, practical SOA systems can be a difficult challenge. SOA Patterns provides detailed, technology-neutral solutions to the challenges by providing architectural guidance through patterns and anti-patterns. Part 1 of this excerpt focuses on two patterns that address matters of services. These are the patterns you are most likely to use even if your service has modest requirements. The patterns in this excerpt are relevant to implementing the Services (see Figure 1).

There are five patterns in this chapter; Table 1 lists all of them along with the problems they address. In this excerpt we will cover two of them: ServiceHost and Active Service.

Pattern name

Problem address

ServiceHost

How can you make your services adaptable to different configurations easily and save yourself the repetitive and mundane tasks of setting listeners, wiring components etc.

Active Service

How can I increase service autonomy and handle temporal concerns?

Transactional Service

How to handle messages reliably?

Workflodize

How to increase the service's adaptability to changing business processes ?

Edge Component

How to isolate the business  functionality of the service, from the non-related cross-cutting concerns like security, logging etc..

Table 1: List of patterns

ServiceHost
The first pattern we will talk about is one of the most basic patterns if not the most basic one. The ServiceHost Pattern deals with the environment that runs the services instances and handles some of the rote tasks associated with that.

The Problem
Pick a service, any service (don't tell me what it is :). You have some code that sets up listeners for incoming messages or requests. You have some code to wire up components, and you have some code that initializes and activates the service. You probably also have some code to configure your service Well? How did I do? Chances are you have most of if not all these pieces of code somewhere in your service.

There are quite a few tasks that are repetitive and common. Maybe there is something we can do about it.

How can you make your services adaptable to different configurations easily and save yourself the repetitive and mundane tasks of setting listeners, wiring components, etc.

The first option, or actually non-option, is to rewrite the wiring and the rest of the repetitive code for each and every service. Obviously, this is not a good option - for one you are likely to introduce bugs as you write something again and again. The multiple copies of the same code problem are even worse when we consider maintaining this code. During maintenance you not only need to make bug fixes and changes for each service, but also make sure that you didn't miss any of them and all the services are up to date.

More Stories By Arnon Rotem-Gal-Oz

For the past 10 years Arnon Rotem-Gal-Oz has been an architecture and system designer of large distributed systems including C4ISR systems, IP customer care and billing systems, and BI engines. He has experience with a variety of technologies (.Net, J2EE, CORBA, COM+, X-Windows) on diverse platforms (Unix, Windows, Dos, AS/400). He currently works for Rafael as the Biometric line development manager.

Comments (0)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


@MicroservicesExpo Stories
In his session at 20th Cloud Expo, Mike Johnston, an infrastructure engineer at Supergiant.io, discussed how to use Kubernetes to set up a SaaS infrastructure for your business. Mike Johnston is an infrastructure engineer at Supergiant.io with over 12 years of experience designing, deploying, and maintaining server and workstation infrastructure at all scales. He has experience with brick and mortar data centers as well as cloud providers like Digital Ocean, Amazon Web Services, and Rackspace. H...
When you focus on a journey from up-close, you look at your own technical and cultural history and how you changed it for the benefit of the customer. This was our starting point: too many integration issues, 13 SWP days and very long cycles. It was evident that in this fast-paced industry we could no longer afford this reality. We needed something that would take us beyond reducing the development lifecycles, CI and Agile methodologies. We made a fundamental difference, even changed our culture...
As many know, the first generation of Cloud Management Platform (CMP) solutions were designed for managing virtual infrastructure (IaaS) and traditional applications. But that’s no longer enough to satisfy evolving and complex business requirements. In his session at 21st Cloud Expo, Scott Davis, Embotics CTO, will explore how next-generation CMPs ensure organizations can manage cloud-native and microservice-based application architectures, while also facilitating agile DevOps methodology. He wi...
Docker is sweeping across startups and enterprises alike, changing the way we build and ship applications. It's the most prominent and widely known software container platform, and it's particularly useful for eliminating common challenges when collaborating on code (like the "it works on my machine" phenomenon that most devs know all too well). With Docker, you can run and manage apps side-by-side - in isolated containers - resulting in better compute density. It's something that many developer...
These days, change is the only constant. In order to adapt and thrive in an ever-advancing and sometimes chaotic workforce, companies must leverage intelligent tools to streamline operations. While we're only at the dawn of machine intelligence, using a workflow manager will benefit your company in both the short and long term. Think: reduced errors, improved efficiency and more empowered employees-and that's just the start. Here are five other reasons workflow automation is leading a revolution...
We have Continuous Integration and we have Continuous Deployment, but what’s continuous across all of what we do is people. Even when tasks are automated, someone wrote the automation. So, Jayne Groll evangelizes about Continuous Everyone. Jayne is the CEO of the DevOps Institute and the author of Agile Service Management Guide. She talked about Continuous Everyone at the 2016 All Day DevOps conference. She describes it as "about people, culture, and collaboration mapped into your value streams....
Cloud adoption is often driven by a desire to increase efficiency, boost agility and save money. All too often, however, the reality involves unpredictable cost spikes and lack of oversight due to resource limitations. In his session at 20th Cloud Expo, Joe Kinsella, CTO and Founder of CloudHealth Technologies, tackled the question: “How do you build a fully optimized cloud?” He will examine: Why TCO is critical to achieving cloud success – and why attendees should be thinking holistically ab...
Docker is on a roll. In the last few years, this container management service has become immensely popular in development, especially given the great fit with agile-based projects and continuous delivery. In this article, I want to take a brief look at how you can use Docker to accelerate and streamline the software development lifecycle (SDLC) process.
We define Hybrid IT as a management approach in which organizations create a workload-centric and value-driven integrated technology stack that may include legacy infrastructure, web-scale architectures, private cloud implementations along with public cloud platforms ranging from Infrastructure-as-a-Service to Software-as-a-Service.
Did you know that you can develop for mainframes in Java? Or that the testing and deployment can be automated across mobile to mainframe? In his session and demo at @DevOpsSummit at 21st Cloud Expo, Dana Boudreau, a Senior Director at CA Technologies, will discuss how increasingly teams are developing with agile methodologies, using modern development environments, and automating testing and deployments, mobile to mainframe.
As DevOps methodologies expand their reach across the enterprise, organizations face the daunting challenge of adapting related cloud strategies to ensure optimal alignment, from managing complexity to ensuring proper governance. How can culture, automation, legacy apps and even budget be reexamined to enable this ongoing shift within the modern software factory?
While some vendors scramble to create and sell you a fancy solution for monitoring your spanking new Amazon Lambdas, hear how you can do it on the cheap using just built-in Java APIs yourself. By exploiting a little-known fact that Lambdas aren’t exactly single-threaded, you can effectively identify hot spots in your serverless code. In his session at @DevOpsSummit at 21st Cloud Expo, Dave Martin, Product owner at CA Technologies, will give a live demonstration and code walkthrough, showing how ...
There are several reasons why businesses migrate their operations to the cloud. Scalability and price are among the most important factors determining this transition. Unlike legacy systems, cloud based businesses can scale on demand. The database and applications in the cloud are not rendered simply from one server located in your headquarters, but is instead distributed across several servers across the world. Such CDNs also bring about greater control in times of uncertainty. A database hack ...
@DevOpsSummit at Cloud Expo taking place Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center, Santa Clara, CA, is co-located with the 21st International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is ...
API Security is complex! Vendors like Forum Systems, IBM, CA and Axway have invested almost 2 decades of engineering effort and significant capital in building API Security stacks to lockdown APIs. The API Security stack diagram shown below is a building block for rapidly locking down APIs. The four fundamental pillars of API Security - SSL, Identity, Content Validation and deployment architecture - are discussed in detail below.
With Cloud Foundry you can easily deploy and use apps utilizing websocket technology, but not everybody realizes that scaling them out is not that trivial. In his session at 21st Cloud Expo, Roman Swoszowski, CTO and VP, Cloud Foundry Services, at Grape Up, will show you an example of how to deal with this issue. He will demonstrate a cloud-native Spring Boot app running in Cloud Foundry and communicating with clients over websocket protocol that can be easily scaled horizontally and coordinate...
In his session at 20th Cloud Expo, Scott Davis, CTO of Embotics, discussed how automation can provide the dynamic management required to cost-effectively deliver microservices and container solutions at scale. He also discussed how flexible automation is the key to effectively bridging and seamlessly coordinating both IT and developer needs for component orchestration across disparate clouds – an increasingly important requirement at today’s multi-cloud enterprise.
DevOps at Cloud Expo, taking place October 31 - November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 21st Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to w...
IT organizations are moving to the cloud in hopes to approve efficiency, increase agility and save money. Migrating workloads might seem like a simple task, but what many businesses don’t realize is that application migration criteria differs across organizations, making it difficult for architects to arrive at an accurate TCO number. In his session at 21st Cloud Expo, Joe Kinsella, CTO of CloudHealth Technologies, will offer a systematic approach to understanding the TCO of a cloud application...
Most companies are adopting or evaluating container technology - Docker in particular - to speed up application deployment, drive down cost, ease management and make application delivery more flexible overall. As with most new architectures, this dream takes a lot of work to become a reality. Even when you do get your application componentized enough and packaged properly, there are still challenges for DevOps teams to making the shift to continuous delivery and achieving that reduction in cost ...