Developing, deploying, and operating cloud applications should be as easy as (if not easier than) local applications.
In this blog (first in a series), I will introduce Spring Cloud and show its usage from the application developer point of view.
One of the many advantages of running an application in the cloud is easy availability of a variety of services. Spring Cloud does all this in a cloud-independent manner through the concept of a Cloud Connector. Spring Cloud also recognizes that it cannot possibly cater to every service on every cloud.
Finally, it features a special support forSpringapplications (in a separate module) includingSpring Bootapplications in the form of Java and XML configuration support and exposing application and services properties in an easy to consume form.
We will start with a simple application ( source code ) based on Spring Boot (a traditional Spring MVC application would have worked fine, albeit at the expense of a lot more setup code). The class extends AbstractCloudConfig , which is the way to use the Java config approach with Spring Cloud. In a real app, you probably would inject these services into service beans and do something more useful that printing their connection information! Here we create add-ons (similar to Cloud Foundry services) for a MongoDb, Redis, and AMQP service provider. The DataSource created this way will have max pool size of 20 and max wait time of 200 milliseconds along with a specific connection property string.
Spring Cloud abstracts connecting to cloud services and makes it possible to have the same application deployed to multiple clouds with little extra effort.
With all of the cloud-native evolutions in tooling, frameworks and platforms, developers are faced with so many ways to solve the same problems.
Unlike the Borg, in which all members are tightly coupled and share a hive mind, microservices need to be loosely coupled and easily discovered by one another. So how do I get the B part deployed and integrated so that 50 percent of my users hitting my landing page can have the “cool new way” experience?

Dustin RuehleDustin is the Director of Integration and API Management at ECS Team and has over 18 years of software development, integration and architecture expertise. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
Cloud Foundry - Streamline application development, deployment and operations on a centrally-managed Platform as a Service for public and private cloud. That is and should be a governing principle behind any cloud platform, library, or tool.Spring Cloud--an open-source library--makes it easy to develop JVM applications for the cloud. Instead of managing hardware, installation, operation, backups, etc., you simply create and bind services with a click of a button or a shell command.
For example, if you have a relational database bound to your application, you will need to create a DataSource object based on that service.
While it provides implementations for Cloud Foundry and Heroku, you (or the cloud provider) can extend it to other clouds by implementing an interface and taking advantage of the rest of the library. Therefore, while supporting many common services out of the box, it allows you (or the service provider) to extend its functionality to other services. The application consists of a controller with beans injected representing bound services and a home page that prints information about the services bound to the application. Heroku automatically provisions a Postgres service, therefore we don’t need to explicitly add it.
When we visit our application, it shows all services info much the same way it did on Cloud Foundry. But in practice, you often need more control over creating a service connector such as setting their pooling parameters. Instead, we use the API exposed by AbstractCloudConfig to create beans for each of the services. Some of the fun, I must admit, is trying to figure out how I can solve one of those problems in a new way.
Here’s where I can use the blue-green deployment capability within Cloud Foundry to get me part of the way there and Eureka for the rest.

This is incorporating the next step of the blue-green deployment in Cloud Foundry: mapping the original route of the “old way” service to our “cool new way” service.
He has architected, implemented and supported large-scale, mission critical projects for ECS Team for eight years with a passion for creating value within the business. With it, applications can connect to services and discover information about the cloud environment easily in multiple clouds such as Cloud Foundry and Heroku. Then, simply add the library containing the extension to your application's classpath; there is no need to fork and build Spring Cloud. Just as extending for other clouds, you add the jar containing your service extensions to your application’s classpath.
Other framework providers may contribute specific support for their frameworks in a similar manner.
In the next blog, we will explore more about the Java and XML config as well as how you can use its core API in non-spring apps. The developer wants to do it fast, so using frameworks and tools that he or she uses on a daily basis seems to make sense. It removes all the work needed to access and configure service connectors and lets you focus on using these services.
There are a few other differences in how Spring Cloud adapts to differences between these two clouds; we will cover those in a later blog.
While the former scans for the candidate classes that could be instantiated as beans, the latter scans for bound services. Percentages of requests using A or B becomes an exercise of scaling up or down the number of “old way” services and “cool new way” services using cf scale.

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