Shulou(Shulou.com)05/31 Report--

This article shows you what aspects you need to determine to build SaaS applications on PaaS. The content is concise and easy to understand, which will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Legacy systems contain thousands of service components that perform a large number of business functions. For example, suppose that a set of components in an internal legacy system running by your business provides a statistical report to business executives. In order to get the weekly report before the deadline, the executive should consider migrating the necessary components to a new software-as-a-service (SaaS) application.

If the economic feasibility study shows that this migration is a wise decision, he should work with other executives and a team of developers, systems engineers, and business analysts to subdivide the legacy system into multiple components. and then start developing that application.

1. Identify legacy system assets

Development teams, executives, and legacy system leaders need to identify the assets of the legacy system. These assets include the following:

Documentation, including a description and flow chart of the legacy system and a disaster recovery plan

The facility where the company's internal data center is located

Stakeholders related to legacy systems

This includes current users (including executives), developers, system administrators, and business analysts

Legacy systems run on the above IT infrastructure

And the technical skills of developers, such as developing SaaS applications on platform as a Service (PaaS), allowing developers to share skills in a virtual environment.

2. Discover the necessary components and dependencies

Developers should scan the source code for service components for later extraction. The source code includes the main program and its interface with the subroutine, which may be written in a programming language different from the main programming language.

The next step is for the developer to identify the dependencies between the components in the main program and the subroutine. There may be many-to-many relationships between the dependencies of service components and those of other service components.

In the process of identifying components, developers should also design a flowchart to help them visualize the dependencies of service components on each other.

3. Extract components

Developers should determine which components should be extracted from legacy systems. The simplicity of extracting service components depends on the following five factors:

How well the source code was written in the first place

How often the source code is patched and patched again to fix software errors

Are the documentation of legacy systems updated regularly?

The technical skills of the developer (for example, the original developer of the legacy system may no longer be found)

And the complexity of the dependencies of service components.

4. Accept or reject extracted components

Once the developer has clarified the dependency, he can accept or reject the dependency. Accepting dependencies does not always mean accepting serviced components as is. Developers may need to redesign the structure of service components to meet new business requirements. Combining dependencies is expected to eliminate duplication or similar service functions, thus reducing the number of service components. Developers put all accepted service components into a component library for use when building SaaS applications.

Build and install SaaS applications

When building SaaS applications on PaaS, developers should make sure that:

1. What do users, developers, system administrators, and business analysts expect from SaaS applications, and then choose the type of cloud deployment required for SaaS applications to run: private, public, or hybrid.

2. Which accepted service components are used when building applications based on the expected requirements of users, developers, system developers, and business analysts.

3. What is the most cost-effective way to orchestrate service components into a loosely coupled SaaS application, and test whether the results of the application meet the desired goals. Loose coupling means that the rest of the application can continue to run while waiting for the user to respond.

After installing the application, the developer should monitor the performance of the SaaS application and any changes in business requirements that may require updating and redesigning the service components of the application.

The above are the aspects that need to be determined to build SaaS applications on PaaS. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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