Summary of Engenharia de Software - Aula 15 - Arquitetura orientada a serviços

00:00:00 - 00:20:00

In the "Engenharia de Software - Aula 15 - Arquitetura orientada a serviços" YouTube video, Professor Marcelo Fantinato discusses Service-Oriented Architecture (SOA), a more comprehensive approach to software development that encompasses the entire software engineering process. SOA is based on the idea of services, which can be accessed by other software systems. The speaker uses a figure to illustrate the concept, explaining that a service provider creates and registers a service, which can be discovered and accessed by a service consumer using a specific protocol. SOA allows for a flexible and scalable software system, and the speaker provides an example of a system information software based on services. The speaker also discusses how to use services to access legacy systems and make them accessible to new systems, as well as the importance of service availability and communication between services. Throughout the video, the speaker emphasizes the evolution of SOA into service engineering, where the entire engineering process is based on services.

• 00:00:00 In this section of the "Engenharia de Software" course, Professor Marcelo Fantinato introduces the topic of Service-Oriented Architecture (SOA), a subfield of software architecture. While there is an overlap with the architecture of software discussed in previous lessons, SOA is not the same concept. SOA is a more comprehensive approach to software development, encompassing areas such as service-oriented requirements engineering, architecture, implementation, testing, and more. SOA originated in the field of architecture but has since expanded to encompass the entire software engineering process. SOA is based on the idea that a software system can provide a service to another software system, just as people and companies provide services to each other. This concept of SOA involves breaking down a system into services, each with its own functionality, and distributing them across a network. A system can then request a service from another system, receive a response, and continue the process with another service request. This approach allows for a more flexible and scalable software system.
• 00:05:00 In this section of the "Engenharia de Software - Aula 15 - Arquitetura orientada a serviços" YouTube video, the speaker explains the concept of Service-Oriented Architecture (SOA) using a basic figure. SOA is focused on the idea of services, and it consists of a service provider and a service consumer. The provider creates and registers a service, and the consumer can access it using a specific protocol, such as SOAP and WSDL for web services. The provider publishes the service interface in a WSDL language, which can be found in a service registry or directory, allowing consumers to discover and access the service. The speaker also mentions other web services standards like WS-Policy, WS-Security, and WS-Reliability, which provide additional functionality for security, quality of service, and orchestration.
• 00:10:00 In this section of the "Engenharia de Software - Aula 15 - Arquitetura orientada a serviços" YouTube video, the speaker discusses an example of a system information software based on services, using the Rocksoft system as an illustration. The system is divided into several components, one of which is the traffic control system. This component accesses an external service, the information mobile service, which in turn accesses some external services, such as traffic information and meteorological data from partners. Another component, traffic information, directly accesses another service. This composition of services allows a software to access multiple services, with each service potentially accessing others. The speaker emphasizes that the software may not be aware of these dependencies and that this organization of access is not necessarily clear. The speaker also mentions that the architecture of services has evolved into what is now called service engineering, where requirements, specifications, implementation, and validation of services are considered from the outset. The entire engineering process, from requirements to testing and implementation, can be based exclusively on services. Examples include describing requirements or functional modeling of software based on services, rather than classes and objects. Instead, services have inputs and outputs, and the concept of attributes is replaced by service changes.
• 00:15:00 In this section of the "Engenharia de Software - Aula 15 - Arquitetura orientada a serviços" YouTube video, the speaker discusses how to use services to access legacy systems and make them accessible to new systems. Although modern software engineering is service-oriented, it's uncommon to develop an entirely new system from scratch. Instead, one can create interfaces (services) to access legacy systems, enabling new systems to utilize their functions through a web interface. The speaker also introduces the concept of modeling processes using high-level diagrams, such as workflows, which can represent complex interactions between multiple services. For instance, a client-server relationship involves one service being invoked by another, and the speaker uses a diagram to illustrate this process.
• 00:20:00 In this section of the "Engenharia de Software - Aula 15 - Arquitetura orientada a serviços" YouTube video, the concept of service availability and communication between services is discussed. The speaker explains that a service checks if it has the processor availability to perform a task. If it does, it establishes parameters for the work and calls another service from the provider. The client can invoke multiple services from the provider, and the provider can invoke a service from the client to return results. The speaker provides an overview of Service-Oriented Architecture (SOA), which has been in use for at least a decade, and many organizations have adopted this approach to develop systems. However, there are more details to explore about SOA, and additional resources are available for further learning on this topic.