Complete the classes

src/main/java/DownloadWorker.java

@@ -21,23 +21,32 @@ 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("[Worker] Start downloading for " + chunkStatus.getChunkId());
 
         while (downloaded < chunkStatus.getChunkSizeMB()) {
-            // TODO: Generate a random sleep delay between min and max delay.
+            long sleepTime = (long) config.getMinStepDelayMs() + (long) (random.nextDouble() * (config.getMaxStepDelayMs() - config.getMinStepDelayMs()));
-            // TODO: Sleep for that delay.
-            // TODO: Generate a random download amount for this step.
-            // TODO: Increase downloaded, but do not go beyond chunk size.
-            // TODO: Save the updated downloaded value into chunkStatus.
-            // TODO: Optionally print step-by-step progress.
-        }
 
-        // TODO: Mark the chunk as completed.
+            try {
-        // TODO: Record the chunk end time in chunkStatus.
+                Thread.sleep(sleepTime);
-        // TODO: Print a message that this chunk has finished downloading.
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+                break;
             }
+            double stepSize = config.getMinStepDownloadMB() + (random.nextDouble() * (config.getMaxStepDownloadMB() - config.getMinStepDownloadMB()));
 
+            downloaded += stepSize;
+
+            if (downloaded > chunkStatus.getChunkSizeMB()) downloaded = chunkStatus.getChunkSizeMB();
+
+            chunkStatus.setDownloadedMB(downloaded);
+            System.out.println("Chunk " + chunkStatus.getChunkId() + " progress: " + downloaded + "/" + chunkStatus.getChunkSizeMB());
+        }
+        chunkStatus.setCompleted(true);
+        chunkStatus.setEndTimeMs(System.currentTimeMillis());
+        System.out.println("[Worker] Finished download for " + chunkStatus.getChunkId());
+    }
 }

src/main/java/Main.java

@@ -5,7 +5,6 @@ public class Main {
     public static void main(String[] args) {
         System.out.println("=== Simulated Download Manager ===");
 
-        // 1. Read config
         DownloadConfig config;
         try {
             config = ConfigReader.readConfig("download_config.txt");
@@ -19,13 +18,11 @@ public class Main {
         System.out.println("Chunk count: " + config.getChunkCount());
         System.out.println();
 
-        // 2. Create chunks
         List<ChunkStatus> chunks = ChunkUtils.createChunks(
                 config.getTotalSizeMB(),
                 config.getChunkCount()
         );
 
-        // 3. Create worker threads
         List<Thread> workerThreads = new ArrayList<>();
 
         for (ChunkStatus chunk : chunks) {
@@ -34,50 +31,38 @@ public class Main {
 
             workerThreads.add(workerThread);
 
-            // TODO:
+            System.out.println("[Main] Assigned chunk ID " + chunk.getChunkId() +
-            // Students may print helpful debug information here,
+                    " (Size: " + chunk.getChunkSizeMB() + " MB) to " + workerThread.getName());
-            // for example which chunk is assigned to which worker thread.
         }
 
-        // 4. Create and start monitor thread
         ProgressMonitor monitor = new ProgressMonitor(config, chunks);
         Thread monitorThread = new Thread(monitor, "Progress-Monitor");
 
-        // TODO:
+        monitorThread.start();
-        // Start the monitor thread before starting the workers
+        System.out.println("[Main] Monitor thread started");
-        // so that progress can be displayed while downloading happens.
-        //
-        // Example idea:
-        // monitorThread.start();
 
-        // 5. Start worker threads
+        for (Thread workerThread : workerThreads) {
-        // TODO:
+            workerThread.start();
-        // Start each worker thread in workerThreads.
+        }
-        // Use a loop and call start() on each thread.
+        System.out.println("[Main] All worker threads started.");
 
-        // 6. Wait for workers to finish
+        try {
-        // TODO:
+            for (Thread thread : workerThreads) {
-        // Wait for all worker threads to complete by calling join().
+                thread.join();
-        // This should be done inside a try-catch block for InterruptedException.
+            }
-        //
+            System.out.println("[Main] All workers finished.");
-        // Hint:
+        } catch (InterruptedException e) {
-        // for (Thread thread : workerThreads) {
+            System.out.println("[Main] Main thread interrupted while waiting for workers.");
-        //     thread.join();
+            Thread.currentThread().interrupt();
-        // }
+        }
 
-        // TODO:
+        try {
-        // After all workers finish, the monitor thread may also need to stop.
+            monitorThread.join();
-        // Depending on how ProgressMonitor is implemented, students may:
+            System.out.println("[Main] Monitor finished.");
-        // - wait for it to finish on its own, or
+        } catch (InterruptedException e) {
-        // - add a stopping mechanism in ProgressMonitor later.
+            System.out.println("[Main] Main thread interrupted while waiting for monitor.");
-        //
+        }
-        // If your monitor finishes automatically, you may join it here.
 
-        // NOTE:
-        // this final report may show 0 progress because no worker has actually run yet.
-        // Until students complete the thread start/join TODOs above,
-
-        // 7. Print final report
         System.out.println();
         System.out.println("=== Final Report ===");
 

src/main/java/ProgressMonitor.java

@@ -16,16 +16,7 @@ public class ProgressMonitor implements Runnable {
 
     @Override
     public void run() {
-        // TODO:
+        System.out.println("[Monitor] Started monitoring progress...");
-        // Repeatedly check chunk progress until all chunks are completed.
-        // In each loop:
-        // 1. Read the downloaded size from every chunk
-        // 2. Add all downloaded amounts to totalDownloadedMB
-        // 3. Count completed chunks
-        // 4. Print a progress message
-        // 5. If completedChunks == chunks.size(), print a final monitor message and stop
-        // 6. Otherwise sleep for monitorDelayMs and continue
-
 
         while (true) {
             double totalDownloadedMB = 0.0;
@@ -54,9 +45,11 @@ public class ProgressMonitor implements Runnable {
                     chunks.size()
             );
 
-
+            if (completedChunks == chunks.size())
-            // TODO:
+            {
-            // If all chunks are completed, print a final message and exit the loop
+                System.out.println("[Monitor] All chunks downloaded successfully!");
+                break;
+            }
 
             try {
                 Thread.sleep(monitorDelayMs);