implement DownloadWorker.java

src/main/java/DownloadWorker.java

@@ -21,23 +21,36 @@ public class DownloadWorker implements Runnable {
 
     @Override
     public void run() {
-        // TODO: Record the chunk start time in chunkStatus.
+        chunkStatus.setStartTimeMs(System.currentTimeMillis());
         double downloaded = 0.0;
 
-        // TODO: Print a message that this chunk has started downloading.
+        System.out.println("Chunk " + chunkStatus.getChunkId() + " started downloading.");
 
         while (downloaded < chunkStatus.getChunkSizeMB()) {
-            // TODO: Generate a random sleep delay between min and max delay.
+            try {
-            // TODO: Sleep for that delay.
+                int delay = config.getMinStepDelayMs()
-            // TODO: Generate a random download amount for this step.
+                        + random.nextInt(config.getMaxStepDelayMs() - config.getMinStepDelayMs() + 1);
-            // TODO: Increase downloaded, but do not go beyond chunk size.
+                Thread.sleep(delay);
-            // TODO: Save the updated downloaded value into chunkStatus.
+
-            // TODO: Optionally print step-by-step progress.
+                double stepDownload = config.getMinStepDownloadMB()
+                        + random.nextDouble() * (config.getMaxStepDownloadMB() - config.getMinStepDownloadMB());
+
+                downloaded += stepDownload;
+                if (downloaded > chunkStatus.getChunkSizeMB()) {
+                    downloaded = chunkStatus.getChunkSizeMB();
                 }
 
-        // TODO: Mark the chunk as completed.
+                chunkStatus.setDownloadedMB(downloaded);
-        // TODO: Record the chunk end time in chunkStatus.
+
-        // TODO: Print a message that this chunk has finished downloading.
+            } catch (InterruptedException e) {
+                System.err.println("[Worker-" + chunkStatus.getChunkId() + "] Download interrupted.");
+                Thread.currentThread().interrupt();
+                return;
+            }
+        }
+        chunkStatus.setCompleted(true);
+        chunkStatus.setEndTimeMs(System.currentTimeMillis());
+        System.out.println("[Worker-" + chunkStatus.getChunkId() + "] Download completed.");
     }
 
 }