Spam detector.

Purpose

Get familiar with coroutines concept. Understand how to organize coroutines and how to do work in parallel and asynchronously.

Introduction

Let’s imagine that we need to implement spam detection in text. Program will assume that particular text is spam if it contains following words: “spam”, “advertisement”. However, we have to implement a program is such a way that it will process text in parallel. Program should create separate coroutine for each n lines of text (where n can be configured). Also, if one of the coroutines find one of the spam markers, all detection coroutines should stop execution. As a result, such detection should return that text contains spam because at least one of the parts contains spam.

Task description

Your task is to implement three classes:

• LetterProcessor – the class will split text into several parts
• WordSpecificSearchSpamDetector – the class will process text and determine whether text contains spam. It will be determined based on the markers in the text
• ConcurrentSpamDetector – the class will process text in two phases:
  1. Split text into several parts using LetterProcessor
  2. Process each part using WordSpecificSearchSpamDetector
  3. Join all results and return true for spam detection if at least one part contains spam