For this Project 3 Threads milestone, your project must maintain the functionality from the Project v3.0 Tests assignment, as well as support multithreaded searching of the thread-safe inverted index using the same custom-made work queue from the Project v3.0 Tests assignment.

To do this, you should either create new classes or extend existing classes to support multithreading. DO NOT REMOVE YOUR SINGLE THREADING CODE, as you still need to support single threaded building and searching the index.

<aside> <img src="/icons/error_gray.svg" alt="/icons/error_gray.svg" width="40px" /> Do NOT use any of the classes in the java.util.concurrent package and do NOT use the Stream.parallel method for the multithreaded code.

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TABLE OF CONTENTS

Prerequisites

You must complete the following assignments before beginning to work on this one:

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Functionality

Your main method must be placed in a class named Driver and must process the following additional command-line arguments:

• -threads [num] where this flag/value pair works as before, but now also enables multithreaded search. See the “Multithreaded Search” section below for details.

These are in addition to the command-line arguments from the previous Project v3.0 Tests assignment.

The command-line flag/value pairs may be provided in any order or not at all. Do not convert paths to absolute form when processing command-line input!

Output user-friendly error messages in the case of exceptions or invalid input. Under no circumstance should your main() method output a stack trace to the user!

Multithreaded Search

If multithreading is enabled, the search process from Project v2.1 Tests must be multithreaded as follows:

• The inverted index must be made thread-safe and the build process must be multithreaded using the custom-made thread pool and work queue from the Project v3.0 Tests releases.
• The search process must be multithreaded by creating one task per query line being processed from the query file. It must still match the design used to earn your Project v2.4 Design grade (with only minor modifications).

The output of the search process will be the exact same as the Project 2 Search milestones.

Run Examples