Microservices vs SOA

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In this blog, I will explain you layered-based architectures and tell youwhat isthe difference between Microservices vs SOA Architecture?Understanding how they differ will lay the basic foundation required for Microservices Certification Training.So, before we deepdive into the differences between the Microservices vs SOA, let me just tell you the basic differences between the Monolithic architecture, SOA, andMicroservices.In layman terms, Monolithic is similar to a big container wherein all the software components of an application are assembled together and tightly packaged.A Service-Oriented Architecture is essentially a collection of services. These services c ommunicate with each other. The communication can involve either simple data passing or it could involve two or more services coordinating some activity. Some means of connecting services to each other is needed.Microservices, akaMicroservice Architecture, is an architectural style that structures an application as a collection of small autonomous services, modeled around abusiness domain.You can also watch the below video where our Microservice Architecture expert has explained the differences between Microservices Architecture and SOA.Microservices vs SOA | Edureka This video will help you understand the differences between their architectures and other major features.Now, let us see the key differences between the Microservices vs SOA :Microservices vs SOAWhen comparing Microservices vs SOA, they both rely on services as the main component but they vary greatly in terms of service characteristics.Service Oriented ArchitectureIt defines 4 basic service types as depicted below:Busi ness Services:They are coarse-grained services that define core business operations.Represented through XML, Business Process Execution Language (BPEL) and others.Enterprise Services:Implements the functionality defined by business services.They mainly rely on application services and infrastructure services to fulfill business requests.Application ServicesFine-grained services that are confined to a specific application context.A dedicated user interface can directly invoke the services.Infrastructure ServicesImplements non-functional tasks such as authentication, auditing, security, and logging.They can be invoked from either application services or enterprise services.Microservices have limited service taxonomy. They consist of 2 service types as depicted below.Functional Services:They Support specific business operations.Accessing of services is done externally and these services are not shared with other services.As in SOA, infrastructure services implement tasks such as auditi ng, security, and logging.In this, the services are not unveiled to the outside world.Major differences between SOA and MSASOAMSAFollows share-as-much-as-possible architecture approachFollows share-as-little-as-possible architecture approachImportance is on business functionality reuseImportance is on the concept of bounded contextThey have common governance and standardsThey focus on people collaboration and freedom of other optionsUses Enterprise Service bus (ESB) for communicationSimple messaging systemThey support multiple message protocolsThey use lightweight protocols such as HTTP/REST etc.Multi-threaded with more overheads to handle I/OSingle-threaded usually with the use of Event Loop features for non-locking I/O handlingMaximizes application service reusabilityFocuses on decouplingTraditional Relational Databases are more often usedModern Relational Databases are more often usedA systematic change requires modifying the monolithA systematic change is to create a new service DevOps / Continuous Delivery is becoming popular, but not yet mainstreamStrong focus on DevOps / Continuous DeliveryMajor Differences Between Microservices and SOA in detail:Service Granularity: Service components within a microservices architecture are generallysingle-purpose services that do one thing really, really well. WithSOA, service components can range in size anywhere from smallapplication services to very large enterprise services. In fact, it iscommon to have a service component within SOA represented by alarge product or even a subsystem.Component Sharing: Component sharing is one of the core tenets of SOA. As a matter offact, component sharing is what enterprise services are all about.SOA enhances component sharing, whereas MSA tries to minimize on sharing through bounded context. A bounded context refers to the coupling of a component and its data as a single unit with minimal dependencies. As SOA relies on multiple services to fulfill a business request, systems buil t on SOA are likely to be slower than MSA.Middleware vs API layer: The microservices architecture pattern typically has what isknown as an API layer, whereas SOA has a messaging middlewarecomponent. The messaging middleware in SOA offers a host of additional capabilities not found in MSA, including mediation and routing, message enhancement, message, and protocol transformation. MSA has an API layer between services and service consumers.Remote services: SOA architectures rely on messaging (AMQP, MSMQ) and SOAP as primary remote access protocols. Most MSAs rely on two protocols REST and simple messaging (JMS, MSMQ), and the protocol found in MSA is usually homogeneous.Heterogeneous interoperability: SOA promotes the propagation of multiple heterogeneous protocols through its messaging middleware component. MSA attempts to simplify the architecture pattern by reducing the number of choices for integration. If you would like to integrate several systems using different protocols in a heterogeneous environment, you need to consider SOA. If all your services could be exposed and accessed through the same remote access protocol, then MSA is a better option.In the end, I will say it is not that simple to tell which architecture is better than other. It mainly depends on the purpose of the application you are building.SOA is better suited for large and complex business application environments that require integration with many heterogeneous applications i.e. smaller applications are not a good fit for SOA as they dont need a messaging middleware component.Microservices, on the other hand, are better suited for smaller and well-partitioned, web-based systems in which microservices give you much greater control as a developer. The conclusion is that since they both have different architecture characteristics but it mainly depends on the purpose of the application you are building.If you wish to learn Microservices and build your own applications, then check out ourMi croservices Architecture Trainingwhichcomes with instructor-led live training and real-life project experience.This training will help you understand Microservices in depth and help you achieve mastery over the subject.Subscribe to our youtube channel to get new updates..! Got a question for us? Please mention it in the comments section of Microservices vs SOA and I will get back to you.Recommended videos for you AWS vs Google Cloud Cloud Platform Compared Watch Now Cloud Computing with AWS II Watch Now AWS Vs Azure Cloud Platform Comparison Watch Now Architecting in Cloud-II Watch Now Building Scalable Application on Cloud Watch Now What Is Cloud Computing? 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