Open / Closed Principle
Open for extension. Closed for modification.
Independent engineering notes / 2008—2025
BUILD.
BREAK.
LEARN.
Software engineering, architecture, systems, and lessons accumulated the hard way.
Featured article
Single Responsibility Principle
One class. One responsibility. One reason to change.
public class ReportService
{
private readonly ICache _cache;
private readonly ILogger _logger;
public Report Get(string id)
{
return _cache.Get(id);
}
}
{
private readonly ICache _cache;
private readonly ILogger _logger;
public Report Get(string id)
{
return _cache.Get(id);
}
}
Performance Notes
Indexes, plans, bottlenecks and the stuff that actually mattered.
Linux Systems
Command-line notes, scripts and infrastructure archaeology.