Code Design - Request

Card Puncher Data Processing

About

A request is a command send to a service that should send back a response.

This is the basic block of computing where application sends request to each other continously.

The request is also generally used as scope in order to keep a data state consistent.

A trace is a tree of log that is aimed to follow a request inside a system.





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Card Puncher Data Processing
Code Design - Connection Pool

Connection pools allow multiple concurrent requests (queries,...) to share a single connection, reducing the connection overhead because a connection takes time (a session must be created, memory allocated,...
Data System Architecture
Data - Transaction (Trans(versal?) actions)

A single logical operation on the data is called a transaction. A physical operation is called a request and therefore a transaction is a queue of request. For example, a transfer of funds from one bank...
Data System Architecture
Data Management - (Transaction|Request|Commit|Redo) Log

(Transaction|Request|commit) logs are structured log file store all changes made to the data as they occur. They permits the implementation of : transaction isolation undoable operation. recovery...
Card Puncher Data Processing
Design Pattern - (Command|Action|Transaction)

Encapsulate a request as an object, letting parametrize clients with different requests, queue or log request and support undoable operations. Netflix/Hystrix/wikiNetflix Hystrix: Wrapping all...
Card Puncher Data Processing
Language - (Execution) Context (Connection=Session, Request, Scope, Namespace)

The context is an object that wraps an execution object in order to set metadata contextual information such: as the start time, the location, ... the scope (ie namespace). session information....
Card Puncher Data Processing
Application - Trace

A trace is a tree of log that is aimed to follow a request inside one or more system. They provide end-to-end visibility into requests, giving you a user-centric view of performance and exposing opportunities...
Response Time Of System
Performance - (Latency|Response time|Running Time)

Latency is a performance metric also known as Response time. Latency (Response Time) is the amount of time take a system to process a request (ie to first response) from the outside or not, remote or...
Resource - Uniform resource identifier ( URI )

A Uniform Resource Identifier (URI) is a string of characters that Identify a resource. Because a resource can be created dynamically, an URI is also a request. 3986Rfc3986 - Uniform Resource Identifier...
Web - URL

An Uniform Resource Locator (URL) is a universal identifier for a resource. Because the resource can be created dynamically, an URL is also logically a request. It's the string that is understood by...



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