System Design
Problem
Typically any system design problem starts with a computation problem where you have to design an algorithm which is efficient. The program uses CPU and RAM and it is important that to consider the CPU usage which is measured in terms of time complexity. The RAM usage is measured by SPACE complexity of the algorithm. The RAM is assumed to be infinite.
Building an ONLINE PROGRAM:
The psuedo code for any online program can be broadly coded as
WHILE TRUE: ( infinite loop)
- ACCEPT THE NEXT INCOMING REQUEST (listening)
- DO THE WORK which includes connecting to the database and do the processing
- RETURN THE RESPONSE in some form of structured data - JSON OR XML
The interface that is visible to the client is called Application Program Interface (API) . When the overall service is too complex, then we can use microservices to make the program more manageable.
So the definition is :
Any system can defined as collection of subsytems that interact with each other which is exposed as API or application program interface. Each of these subsystems can be terms as
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