Initial data:
A desktop XUL tool working with text files: it presented data in the table and performed filtering and searching queries on the data.
The tool consisted of two parts: XUL client and C++ server. XUL part was responsible for GUI and C++ part did data filtering. The client and server communicated with each other using disk files.

Task:
Our task was to increase the speed of data processing, fix application bugs and add multiple data source support: application-specific input and output files and the ability to import and export the files.

Result:
The C++ server was designed and developed from scratch as a command processing service. It communicates with the XUL client using socket, and provides a 70-80% performance increase for data filtering.
The XUL client was modified to support open/save in its own data files format that combines data and filtering criteria for user convenience; export/import to CSV format; data type mapping screen with type correctness checking was added to the application. Some GUI changes were made: modifying menu items, icons, controls, event handlers, etc. Some business logic and GUI problems were detected and fixed.

Technologies: Mozilla XUL, JavaScript, C++, SQLite.
 

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