From 09035b78a2aa6f8f0702d40288ef44a76ef7a6ac Mon Sep 17 00:00:00 2001
From: Matthias Jaros <jarlucmat@mailbox.org>
Date: Fri, 3 Jul 2026 16:38:12 +0200
Subject: Added ability to read from stdin using Streams Replaced useless
 counters with already existing hasNext() methods

---
 src/main/java/com/it_jaros/jscanner/Scanner.java | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

(limited to 'src/main/java/com/it_jaros/jscanner/Scanner.java')

diff --git a/src/main/java/com/it_jaros/jscanner/Scanner.java b/src/main/java/com/it_jaros/jscanner/Scanner.java
index 8de423c..66ceb03 100644
--- a/src/main/java/com/it_jaros/jscanner/Scanner.java
+++ b/src/main/java/com/it_jaros/jscanner/Scanner.java
@@ -61,19 +61,18 @@ public class Scanner implements AutoCloseable {
 
         scan.start();
         CompletionService<ScanResult> completionService = new ExecutorCompletionService<>(executor);
-        Queue<String> hostsInQueue = new ArrayDeque<>(scan.getHosts());
 
-        int hostsToProcess = hostsInQueue.size();
+        Iterator<String> queue = scan.getHosts().iterator();
         int activeHostWorkers = 0;
-        while ((hostsToProcess > 0 && !cancelled) || activeHostWorkers > 0) {
+        while ((queue.hasNext() && !cancelled) || activeHostWorkers > 0) {
             while (
-                    !hostsInQueue.isEmpty() // continue as long as we have hosts to process
+                    queue.hasNext() // continue as long as we have hosts to process
                             && activeHostWorkers < maxHostsLimit // limit is not reached
                             && !cancelled // and scanner not closed
             ) {
                 // here we are filling the completion service
                 // host <-> virtual thread
-                final String host = hostsInQueue.poll();
+                final String host = queue.next();
                 activeHostWorkers++;
                 completionService.submit(() -> scanHostPorts(host, scan.getPorts(), scan));
             }
@@ -85,7 +84,6 @@ public class Scanner implements AutoCloseable {
                     continue;
                 }
                 activeHostWorkers--;
-                hostsToProcess--;
                 scan.addScanResult(finishedHost.get());
             } catch (InterruptedException e) {
                 Thread.currentThread().interrupt();
@@ -118,8 +116,7 @@ public class Scanner implements AutoCloseable {
         List<Throwable> errors = new ArrayList<>();
         AtomicLong portSlotFactory = new AtomicLong(System.nanoTime());
         int activePerHostWorkers = 0;
-        int portsToProcess = portRange.getTotal();
-        while ((portsToProcess > 0 && !cancelled) || activePerHostWorkers > 0) {
+        while ((portRange.hasNext() && !cancelled) || activePerHostWorkers > 0) {
             while (
                     portRange.hasNext() // continue as long as we have ports
                             && activePerHostWorkers < maxWorkersPerHost // and we have not reached our limit 
@@ -143,7 +140,6 @@ public class Scanner implements AutoCloseable {
 
                 PortResult portResult = portResultFuture.get();
                 activePerHostWorkers--;
-                portsToProcess--;
                 progress.done().incrementAndGet();
                 switch (portResult.getState()) {
                     case OPEN -> {
-- 
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