CS342: Software Design

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CS342: Software Design Dec. 5, 2017 Today’s topic Adapter pattern Solution stack US plug vs European outlet Adaptee Adapter Client Object oriented adapters Adapter pattern The Adapter Pattern converts the interface of a class into another interface the clients expect. ● Lets classes work together that couldn’t otherwise because of incompatible interfaces. ● Decouple the client from the implemented interface. ● Encapsulates that change so that the client doesn’t have to be modified each time it needs to operate against a different interface Duck vs. turkey Adapter class Test drive the adapter Adapter pattern The Adapter Pattern converts the interface of a class into another interface the clients expect. ● Lets classes work together that couldn’t otherwise because of incompatible interfaces. ● Decouple the client from the implemented interface. ● Encapsulates that change so that the client doesn’t have to be modified each time it needs to operate against a different interface Adapter pattern explained How does the client use the adapter? Adapter pattern advantages ● Object composition ● Program to an interface, not implementation ● Add new implementations without changing interface Adapter diagram Enumerator vs. Iterator EnumerationIterator Technology stack (aka solution stack, software stack) A set of software components to create a complete platform such that no additional software is needed to support applications ● LAMP - linux, apache, mysql, php ● NMP - Nginx, mysql, Php ● WINS (WISA) - Windows, IIS, .NET, SQL ● Java EE ● SMACK: Apache Spark, Mesos, Akka, Cassandra, Kafka ● MEAN/MERN/MEVN Free and open-source JavaScript software stack for building dynamic web sites and web applications ● Mongodb: document oriented db (non-relational) ● Express.js: web application framework, middleware (backend) ● Angular.js: web application framework (front end, MVC) ● Node.js: Javascript runtime for server side Similar stacks MERN, MEVN: react.js (facebook, instagram), vue.js (Google) ● Javascript and JSON in all layers (show examples, code, db, service call) ● Advantages?.

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