One of the things I wish to do on this blog is to show you realistic examples of using the Spring Framework in Enterprise Application Development. The Spring Framework is very popular for building large scale applications. When you build an e-commerce website that might have 50, users on it at any given time the scope of the application you are building changes.
You have a data center, with a small server farm. The Spring Framework was not only built for this type of application environment, but it also thrives in it. When you start developing enterprise class applications, you will need to support multiple deployment environments. This is known as segregation of duties. A very common business practice. From my personal experience, it is more stringent in large financial enterprises than it is in retail organizations.
More modern development cultures will be performing CI builds and automated deployments. Teams on the bleeding edge of modern software development might even be doing continuous deployments I feel continuous deployment is probably the holy grail of software engineering, but in reality, it is as rare as a great white buffalo in the wild. I do hope to see more organizations adopt continuous deployments, but it does take a very disciplined organization to get there.
Each of these environments will have its own configuration needs. As the scope of your application grows, chances are the uniqueness of each environment will grow too. The Spring Framework has some outstanding tools which are used to manage the complexities of modern enterprise application development. This is your development environment, running from your laptop.
This is an area I often see companies absolutely fail at. Your code should be able to run locally, without the need to connect to other servers in the enterprise. Ideally, you should be able to run the code on a plane at 30, without a wi-fi connection. The Grails team does an outstanding job of supporting a local development environment of of the box.
When you run Grails in dev mode, it will automatically create an in memory H2 database. Hibernate is used to generate the database tables based on your domain classes. Continuous Integration servers can be tricky little beasts to configure for because of the different types of testing software they accommodate. You may have a project the produces a JAR file, which only has unit tests which will zip right along. You may have integration tests, like Grails does, which bring up an embedded Tomcat instance an H2 in-memory database.
Your tests might even perform functional tests using something like Spock and Geb to interact with the embedded Tomcat instance. Its also not uncommon for CI servers to have automated deployment jobs — to another specialized environment. Some companies elect to have a development environment. This is typically a production like server environment that the development team has control over. When you deploy into this environment, you will need to configure the application to interact with servers within that environment.
These environments are often managed by a configuration management team. Sometimes developers will have access to the environment, but often they will not. Pre-Production or Stage Staging is an application environment that works with all the production services and supporting databases.
This is an environment that allows the deployment of application code, but limits the access to that code. For a website, you might see a special URL or access restricted to specific IPs, or throttled by load balancers. This environment is not as common, but some organizations use it. Facebook deploys code something along this line.
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