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This Concept Map, created with IHMC CmapTools, has information related to: Architectural Pattern, Middleware Middleware is the software between your application and the operating system and networking on a computer. It is the layer above the operating system but below the application program that provides a common programming abstraction across a distributed system. It can be called the / in Client/Server. The classical definition of an operating system is “software that makes hardware useable”. Similarly, Middleware can be considered to be the software that makes a distributed system programmable. Pros and Cons of Middleware Pros: Reduce number of interfaces. Clients see only one system i.e. the middleware. Centralizes control. Functionality widely available to all clients. It allows to implement functionality that otherwise would be very difficult to provide. Cons Complex software. Development platform (API) not complete system. Functionality is hard to understand., Middleware Middleware is the software between your application and the operating system and networking on a computer. It is the layer above the operating system but below the application program that provides a common programming abstraction across a distributed system. It can be called the / in Client/Server. The classical definition of an operating system is “software that makes hardware useable”. Similarly, Middleware can be considered to be the software that makes a distributed system programmable. Forms of transparency Access – hide differences in data representation and how a resource is accessed Location – hide where a resource is located Migration – hide that a resource may move to another location Relocation – hide that a resource may move while in use Replication – hide that a resource is replicated Concurrency – hide that a resource may be shared by several competitive users Failure – hide the failure and recovery of a resource Persistence – hide whether a software resource is in memory or on disk, System Architectures includes Peer to Peer which interacting cooperatively as peers without any distinction between client and server processes or the computers that they run on. Peer to peer applications and systems have been successfully constructed that enable tens or hundreds of thousands of computers to provide access to data and other resources that they collectively store and manage. More scalable than client server., Platform Lowest level hardware and software layers are often referred to as a platform Software Layers, Software Layers Consists of a Layer between Application and OS/Network Provides distribution transparency communication infrastructure registration and lookup of remote service\Resolves heterogeneity of Hardware/OS ,Networks, Programming languages Middleware Middleware is the software between your application and the operating system and networking on a computer. It is the layer above the operating system but below the application program that provides a common programming abstraction across a distributed system. It can be called the / in Client/Server. The classical definition of an operating system is “software that makes hardware useable”. Similarly, Middleware can be considered to be the software that makes a distributed system programmable., Client Server The simple structure in which client processes interact with individual server processes in separate host computers in order to access the shared resources that they manage. The client/server model is organized around clients that request services and servers that provide services. Services might include information (such as the current weather) or computational services (such as complex calculations). Some Client/Server Architectural Patterns Thin-Client model: All application processing and data management by server only. Fat-Client model : Server only responsible for data management. The client machine implements application logic and interactions with user. Three-tier client-server: There is a layer between client and server that may provide data and/or application processing., Client Server The simple structure in which client processes interact with individual server processes in separate host computers in order to access the shared resources that they manage. The client/server model is organized around clients that request services and servers that provide services. Services might include information (such as the current weather) or computational services (such as complex calculations). Client/Server Configurations Client-Server configurations are generally categorized in two types: Two-tier Configurations: consisting of a client and a server. Three-tier Configurations: includes another server that offloads certain functions from either the client and/or the server. Since there can be many intermediate servers, this may also be called n-tier. N-Tier Configurations: a type of three-tier set up that includes multiple intermediate servers.