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1. #LAYERS OF THE MAC OS ARCHITECTURE HOW TO#
2. #LAYERS OF THE MAC OS ARCHITECTURE SOFTWARE#
3. #LAYERS OF THE MAC OS ARCHITECTURE CODE#

Onto different networks or on the Internet versus an intranet.Ī 1-Tier application could be a 3-Layer application. With security by segregating more sensitive components and layers Placing your layers on separate physical tiers can help performanceīy distributing the load across multiple servers. Technology or design decisions must be made. The way that the application works when deployed in different ways,Īnd provide a clear delineation between locations where certain Layering helps you to maximize maintainability of the code, optimize The Web application communicates with a separate machine that hosts the database tier, which contains the data layer logic. This tier contains the presentation layer logic and any required business layer logic. Figure below, illustrates a common Web application scenario where the client interacts with a Web server located in the client tier. In this scenario, the client and server may exist on the same machine, or may be located on two different machines. The two-tier pattern represents a client and a server. Each logical layer contains a number of discrete component types grouped into sublayers, with each sublayer performing a specific type of task. They help to differentiate between the different kinds of tasks performed by the components, making it easier to create a design that supports reusability of components.

#LAYERS OF THE MAC OS ARCHITECTURE SOFTWARE#

Layers are the logical groupings of the software components that make up the application or service. Tiers represent the physical separation of the presentation, business, services, and data functionality of your design across separate computers and systems. E.g.: presentation (view), controller, models, repository, data access.

#LAYERS OF THE MAC OS ARCHITECTURE HOW TO#

Layer is a logical unit, how to organize the code. E.g.: client, application server, database server

#LAYERS OF THE MAC OS ARCHITECTURE CODE#

Tier is a physical unit, where the code / process runs. In plain english, the Tier refers to "each in a series of rows or levels of a structure placed one above the other" whereas the Layer refers to "a sheet, quantity, or thickness of material, typically one of several, covering a surface or body".