$1$ File Retrieval Engine Architecture

The File Retrieval Engine must adhere to the architecture shown in Figure $1$ and must

contain three components: AppInterface, ProcessingEngine and IndexStore.

The AppInterface component is responsible with implementing a command line interface

that the user can use to interact with the File Retrieval Engine, with interpreting indexing

and search commands submitted by the user, with forwarding the commands to the

ProcessingEngine and with printing the results of the commands on screen.

The ProcessingEngine component is responsible with running the indexing and search

commands received from the AppInterface component. In terms of indexing, the

ProcessingEngine must use multiple worker threads, that are configured at execution

time, to build an index from the files found at a specified directory. Each worker thread is

responsible with building a local index and with forwarding the local index to the