Making the Case for Service-Oriented Design in Java

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Making the Case for Service-Oriented Design
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Service-oriented design can appear daunting and complex It requires more thought up front and decisions about how to separate logic and data in an application For Rails developers, the idea of designing a complex system ahead of development may
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Richardson, Leonard, and Ruby, Sam RESTful Web Services Sebastopol, CA: O Reilly, 2007
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2 An Introduction to Service-Oriented Design
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seem like heresy One of the biggest advantages of Rails is the ability to quickly add a few models to an application and see results immediately The Rails development style is all about quick iterations However, there s more to the story Up-front design and services give developers the ability to build apps that support greater complexity and larger team sizes Serviceoriented systems sacrifice iteration speed for stability, reuse, and robustness The key to pairing Rails applications with services is to use Rails for its strengths and switch over to services when a more stable approach is required A perfect example of this involves creating a new application Most new applications have many unknowns in terms of exactly what features will be supported and how popular portions of the application will be (thus informing their need for scale) In the early stages, it is best to use the normal Rails tool set However, as parts of an application mature, their interfaces and requirements become more concrete These are the sections that can gain the most from services Utilizing services is best for sections of an application that have stable, well-defined, and well-understood requirements The following sections discuss the advantages of using services rather than using a typical monolithic application
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Isolation
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Many of the benefits of a service-oriented design stem from the concept of isolation Isolation makes a service much easier to manage and optimize Isolated components can be tested separately from other parts of an application Using isolated components provides an easy way of organizing larger teams Developers can focus on isolated components Optimally, this refers to a service running on its own systems, with self-contained business logic and a self-contained data store The separation of a service from other areas of an application enables increased testability and code reuse There are multiple levels of isolation, including business logic, shared system, and full isolation
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Business Logic Isolation
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Services that isolate based on business logic generally have their own application code, with a shared data store and shared systems From an organizational perspective, this can be advantageous because the business logic for parts of the system is contained in one place, without leaking into other sections of the application code base Separation of business logic makes it easier to segment a larger group of workers into teams that can work separately Services isolated on business logic can share data sources with
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Making the Case for Service-Oriented Design
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other systems Generally, this is more common within a legacy system where multiple services must interface with the same database Figure 21 shows what business logic isolation might look like for the interactions between separate components The application servers would probably reside on the same physical server, with the database on another To achieve true business logic
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Services with separate business logic and a shared database
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2 An Introduction to Service-Oriented Design
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isolation, the two services should have separate code bases Further, they should not communicate with each other through the database It s too easy to bleed business logic from the two services together through the shared database Ideally, using services would achieve better isolation However, for the purposes of migrating existing Rails applications to services, the shared database approach may be necessary in the early stages The business logic can be isolated through the use of two services, which share a database The Rails application can still sit on top of those services In the Rails MVC view of the world, these services occupy the Model level of the stack The controllers and views can still be contained within the Rails application
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