http://blog.hellonico.info/tags/concurrency/ Recent content in Concurrency on NicoLabs Hugo ja-JP Sat, 27 Jun 2026 00:00:00 +0000 http://blog.hellonico.info/posts/coni/parallel-downloads/ Sat, 27 Jun 2026 00:00:00 +0000 http://blog.hellonico.info/posts/coni/parallel-downloads/ <p>One of the great things about building your own language and tooling is the ability to rethink how operations are performed. In our latest commits, we decided to tackle a major bottleneck in our build process: downloading Maven dependencies.</p> <h2 id="the-problem-with-platform-specific-scripts">The Problem with Platform-Specific Scripts</h2> <p>Previously, the <code>download-url-to-file</code> function in Coni relied on shelling out to platform-specific tools:</p> <ul> <li>On Linux/macOS, it spawned a <code>curl</code> process.</li> <li>On Windows, it invoked a massive <code>powershell</code> command using <code>System.Net.WebClient</code>.</li> </ul> <p>While this worked, it had several drawbacks. First, shelling out to external processes is slow and resource-intensive. Second, the dependency on external tools meant that subtle differences in <code>curl</code> versions or Windows security protocols could cause unexpected failures. Most importantly, downloading artifacts sequentially using these shell commands meant that resolving a large Maven project would take entirely too long.</p>