ZahraSadatMirvakili/HW-08-Basic-Multithreading
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basic multithreading

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ZahraSadatMirvakili
2026-06-03 00:03:54 +03:30
parent 9e5c715088
commit 8d71e2814e
3 changed files with 111 additions and 44 deletions
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src/main/java/DownloadWorker.java
+31 -12
View File
@@ -21,23 +21,42 @@ public class DownloadWorker implements Runnable {
@Override
public void run() {
// TODO: Record the chunk start time in chunkStatus.
double downloaded = 0.0;
long startTime = System.currentTimeMillis();
chunkStatus.setStartTimeMs(startTime);
// TODO: Print a message that this chunk has started downloading.
double downloaded = 0.0;
int chunkId = chunkStatus.getChunkId();
double chunkSize = chunkStatus.getChunkSizeMB();
System.out.println("[ Worker - " + chunkId +" ] Started downloading chunk " + chunkId +" (" + chunkSize + ") ");
while (downloaded < chunkStatus.getChunkSizeMB()) {
// TODO: Generate a random sleep delay between min and max delay.
// 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.
int delayMs = config.getMinStepDelayMs() + random.nextInt(config.getMaxStepDelayMs()-config.getMinStepDelayMs()+1);
try {
Thread.sleep(delayMs);
}catch (InterruptedException e){
System.out.println("[ Worker - " + chunkId +" ] interrupted ");
return;
}
// TODO: Mark the chunk as completed.
// TODO: Record the chunk end time in chunkStatus.
// TODO: Print a message that this chunk has finished downloading.
double stepSize = config.getMinStepDownloadMB() + random.nextDouble() * (config.getMaxStepDownloadMB() - config.getMinStepDownloadMB());
downloaded = Math.min(chunkSize, downloaded + stepSize);
chunkStatus.setDownloadedMB(downloaded);
System.out.println("[ Worker - " + chunkId +" ] Chunk " + chunkId + ": " + Math.round(downloaded*10)/10.0 + "/" + chunkSize + "(" + Math.round((downloaded/chunkSize)*1000)/10.0 + ")");
}
chunkStatus.setCompleted(true);
long endTime = System.currentTimeMillis();
chunkStatus.setEndTimeMs(endTime);
long duration = endTime - startTime;
System.out.println("[ Worker - " + chunkId +" ]Finished downloading chunk " + chunkId + "in" + (duration/1000.0) + "seconds");
}
}
src/main/java/Main.java
+16 -23
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@@ -33,46 +33,39 @@ public class Main {
Thread workerThread = new Thread(worker, "Worker-" + chunk.getChunkId());
workerThreads.add(workerThread);
// TODO:
// Students may print helpful debug information here,
// for example which chunk is assigned to which worker thread.
System.out.println("Assigned chunk " + chunk.getChunkId() + "to thread: " + workerThread.getName());
}
// 4. Create and start monitor thread
ProgressMonitor monitor = new ProgressMonitor(config, chunks);
Thread monitorThread = new Thread(monitor, "Progress-Monitor");
// TODO:
// Start the monitor thread before starting the workers
// so that progress can be displayed while downloading happens.
//
// Example idea:
// monitorThread.start();
monitorThread.start();
// 5. Start worker threads
// TODO:
// Start each worker thread in workerThreads.
// Use a loop and call start() on each thread.
for (Thread thread : workerThreads){
thread.start();
}
// 6. Wait for workers to finish
// TODO:
// Wait for all worker threads to complete by calling join().
// This should be done inside a try-catch block for InterruptedException.
//
// Hint:
// for (Thread thread : workerThreads) {
// thread.join();
// }
for (Thread thread : workerThreads) {
try{
thread.join();
}catch (InterruptedException e){
System.out.println("Main thread interrupted while waiting for" + thread.getName());}
}
// TODO:
// After all workers finish, the monitor thread may also need to stop.
// Depending on how ProgressMonitor is implemented, students may:
// - wait for it to finish on its own, or
// - add a stopping mechanism in ProgressMonitor later.
//
// If your monitor finishes automatically, you may join it here.
try{
monitorThread.join();
}catch (InterruptedException e){
System.out.println("Main thread interrupted while waiting for monitor");
}
// NOTE:
// this final report may show 0 progress because no worker has actually run yet.
// Until students complete the thread start/join TODOs above,
src/main/java/ProgressMonitor.java
+64 -9
View File
@@ -6,17 +6,21 @@ public class ProgressMonitor implements Runnable {
private final int totalSizeMB;
private final List<ChunkStatus> chunks;
private final long monitorDelayMs;
private double previousTotalDownloadedMB;
private long previousTimeMs;
public ProgressMonitor(DownloadConfig config, List<ChunkStatus> chunks) {
this.fileName = config.getFileName();
this.totalSizeMB = config.getTotalSizeMB();
this.chunks = chunks;
this.monitorDelayMs = 500;
this.previousTotalDownloadedMB = 0.0;
this.previousTimeMs = System.currentTimeMillis();
}
@Override
public void run() {
// TODO:
// Repeatedly check chunk progress until all chunks are completed.
// In each loop:
// 1. Read the downloaded size from every chunk
@@ -24,9 +28,7 @@ public class ProgressMonitor implements Runnable {
// 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
// 6. Otherwise, sleep for monitorDelayMs and continue
while (true) {
double totalDownloadedMB = 0.0;
int completedChunks = 0;
@@ -44,19 +46,56 @@ public class ProgressMonitor implements Runnable {
percent = (totalDownloadedMB * 100.0) / totalSizeMB;
}
long currentTimeMs = System.currentTimeMillis();
long timeDiffMs = currentTimeMs - previousTimeMs;
double downloadedDiff = totalDownloadedMB - previousTotalDownloadedMB;
double speedMBps = 0.0;
if (timeDiffMs > 0){
speedMBps = (downloadedDiff * 1000.0) / timeDiffMs;
}
double etaSeconds = 0.0;
if (speedMBps > 0 && totalDownloadedMB < totalSizeMB){
double remainingMB =totalSizeMB - totalDownloadedMB;
etaSeconds = remainingMB / speedMBps;
}
previousTotalDownloadedMB = totalDownloadedMB;
previousTimeMs = currentTimeMs;
int barWidth = 50;
int filledWidth = (int)(barWidth * percent / 100.0);
System.out.print("[");
for (int i = 0; i < barWidth; i++) {
if (i < filledWidth){
System.out.print("=");
}else if (i == filledWidth && percent< 100){
System.out.print(">");
}else {
System.out.print(" ");
}
}
System.out.print("]");
System.out.printf(
"Progress for %s: %.1f/%.1f MB (%.2f%%), completed chunks: %d/%d%n",
"Progress for %s: %.1f/%.1f MB (%.2f%%), completed chunks: %d/%d%n , ETA: %s",
fileName,
totalDownloadedMB,
(double) totalSizeMB,
percent,
completedChunks,
chunks.size()
chunks.size(),
speedMBps,
formatETA(etaSeconds)
);
// TODO:
// If all chunks are completed, print a final message and exit the loop
if (completedChunks == chunks.size()){
System.out.println("All chunks have been downloaded successfully!");
break;
}
try {
Thread.sleep(monitorDelayMs);
@@ -66,4 +105,20 @@ public class ProgressMonitor implements Runnable {
}
}
}
private String formatETA(double etaSeconds){
if (etaSeconds <= 0){
return "Calculating ...";
}
int hours = (int)(etaSeconds/3600);
int minutes = (int)((etaSeconds%3600)/60);
int secondes = (int)(etaSeconds %60);
if (hours > 0){
return String.format("%dh %dm %ds" , hours, minutes, secondes);
}else if(minutes > 0){
return String.format("%dm %ds" , minutes, secondes);
}else{
return String.format("%ds", secondes);
}
}
}