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A service layer delegates tasks and contacts programs or functions responsible for carrying out activities. It cannot interpret instructions or perform tasks without them. Its main purpose is to reduce computational stress on higher layers and facilitate user needs.
A service layer is used in computer and telecommunications systems to help delegate tasks. The level of service must be below a higher level, because it is only done to help in the efforts; it is not made to perform tasks without instructions. When this level receives an activity, it contacts the levels, programs or functions responsible for carrying out the activity and tells them to activate or deactivate it. Apart from communication, this level usually has no function of its own. Work can be tough for a top layer, so getting that layer to communicate relieves some of the computing stress.
When a service layer is used, it cannot be used as a higher layer that receives instructions from users. This is because this layer would not understand how to interpret the instructions, nor would it know how to fulfill them. Must be under another layer to work properly. One way to think at this level is like an assistant who is good at performing tasks and organizing workers, but not at making decisions without being directly told what to do by management.
After the top level receives an instruction, it delegates it to the underlying service level. For example, the top layer can be told to start sending data packets to a location. That level will indicate the service level, which will contact all programs and functions responsible for performing this task and tell them to start working.
While a service layer can tell other functions to work, the layer itself rarely has functions of its own. It can organize other areas of the computer to do a task properly, but it cannot do the task itself. This means that this level only serves as a link between the higher level and the functions.
The main reason for using a service tier is to make it easier for the higher tier to process requests and reduce the computational stress of the higher tier. Without a service layer, the upper layer would have to take tasks from the user, find the appropriate functions to perform the task, contact those functions, and continue interpreting user commands at the same time. This is often difficult and can lead to slow processing between layers. By adding a middle tier, the top tier can focus on capturing and moving tasks to best facilitate the user’s needs.
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