From 1aab7dedc9859e80fc0dd0cb1c2057d208244ba3 Mon Sep 17 00:00:00 2001
From: Matthias Jaros <jarlucmat@mailbox.org>
Date: Sat, 22 Aug 2026 12:23:10 +0200
Subject: Extracted consumer logic into ConsumerThread

---
 src/main/java/com/it_jaros/jns/scan/Scanner.java   | 32 +++++++---------------
 .../it_jaros/jns/scan/engine/ConsumerThread.java   | 28 +++++++++++++++++++
 .../com/it_jaros/jns/scan/engine/ScanHostTask.java | 31 +++++++--------------
 3 files changed, 48 insertions(+), 43 deletions(-)
 create mode 100644 src/main/java/com/it_jaros/jns/scan/engine/ConsumerThread.java

diff --git a/src/main/java/com/it_jaros/jns/scan/Scanner.java b/src/main/java/com/it_jaros/jns/scan/Scanner.java
index d9dfe47..e76d804 100644
--- a/src/main/java/com/it_jaros/jns/scan/Scanner.java
+++ b/src/main/java/com/it_jaros/jns/scan/Scanner.java
@@ -46,33 +46,21 @@ public class Scanner implements AutoCloseable {
         );
 
         try {
-            runConsumerLoop(state, consumer);
+            new ConsumerThread<>(cancelledToken, state).runConsumerLoop(ignored -> {
+                PollState<ScanResult> poll = getPollStateOfScanResult(state);
+                switch (poll) {
+                    case PollState.Success<ScanResult>(ScanResult value) -> consumer.accept(value);
+                    case PollState.Failure<ScanResult>(Throwable error) -> mapToScanResult(error).ifPresent(consumer);
+                    case PollState.Unavailable<ScanResult> ignore -> {
+                        // we do nothing
+                    }
+                }
+            });
         } finally {
             scan.stop();
         }
     }
 
-    /**
-     * the main thread is the consumer
-     * Let the consumer run as long as the producer runs
-     * or if still tasks are pending in pipeline
-     * we do not listen to canceled here because we want
-     * all results (also partial) collected for the consumer
-     * with whatever is there already
-     */
-    private void runConsumerLoop(ProducerState<ScanResult> state, Consumer<ScanResult> consumer) {
-        while (!cancelledToken.isCancelled() && (state.running().get() || state.inPipeline().get() > 0)) {
-            PollState<ScanResult> poll = getPollStateOfScanResult(state);
-            switch (poll) {
-                case PollState.Success<ScanResult>(ScanResult value) -> consumer.accept(value);
-                case PollState.Failure<ScanResult>(Throwable error) -> mapToScanResult(error).ifPresent(consumer);
-                case PollState.Unavailable<ScanResult> ignore -> {
-                    // we do nothing
-                }
-            }
-        }
-    }
-
     private Optional<ScanResult> mapToScanResult(Throwable error) {
         if (error instanceof RejectedExecutionException) {
             // happens when Ctrl-C is pressed
diff --git a/src/main/java/com/it_jaros/jns/scan/engine/ConsumerThread.java b/src/main/java/com/it_jaros/jns/scan/engine/ConsumerThread.java
new file mode 100644
index 0000000..8cbfcde
--- /dev/null
+++ b/src/main/java/com/it_jaros/jns/scan/engine/ConsumerThread.java
@@ -0,0 +1,28 @@
+package com.it_jaros.jns.scan.engine;
+
+import java.util.function.Consumer;
+
+public class ConsumerThread<T> {
+
+    private final CancelledToken cancelledToken;
+    private final ProducerState<T> state;
+
+    public ConsumerThread(CancelledToken cancelledToken, ProducerState<T> state) {
+        this.cancelledToken = cancelledToken;
+        this.state = state;
+    }
+
+    /**
+     * the main thread is the consumer
+     * Let the consumer run as long as the producer runs
+     * or if still tasks are pending in pipeline
+     * we do not listen to canceled here because we want
+     * all results (also partial) collected for the consumer
+     * with whatever is there already
+     */
+    public void runConsumerLoop(Consumer<Void> callable) {
+        while (!cancelledToken.isCancelled() && (state.running().get() || state.inPipeline().get() > 0)) {
+            callable.accept(null);
+        }
+    }
+}
diff --git a/src/main/java/com/it_jaros/jns/scan/engine/ScanHostTask.java b/src/main/java/com/it_jaros/jns/scan/engine/ScanHostTask.java
index 086a864..87b5f95 100644
--- a/src/main/java/com/it_jaros/jns/scan/engine/ScanHostTask.java
+++ b/src/main/java/com/it_jaros/jns/scan/engine/ScanHostTask.java
@@ -73,7 +73,16 @@ public class ScanHostTask implements Callable<ScanResult> {
                 port -> new ScanPortTask(port, context, hostContext)
         );
 
-        runConsumerLoop(state);
+        new ConsumerThread<>(cancelledToken, state).runConsumerLoop(ignored -> {
+            PollState<PortResult> poll = getPortResult(state);
+            switch (poll) {
+                case PollState.Success<PortResult>(PortResult value) -> accumulator.add(value);
+                case PollState.Failure(Throwable error) -> accumulator.recordFailure(error, -1);
+                case PollState.Unavailable<PortResult> ignore -> {
+                    // we do nothing
+                }
+            }
+        });
         return accumulator.build();
     }
 
@@ -91,26 +100,6 @@ public class ScanHostTask implements Callable<ScanResult> {
         return false;
     }
 
-    /**
-     * consumer is the main thread
-     * we run as long as the producer is running OR
-     * as long as things are in pipeline waiting to be processed
-     * ONLY exception is when cancelled is set
-     */
-    private void runConsumerLoop(ProducerState<PortResult> state) {
-        while (!context.cancelledToken().isCancelled() && (state.running().get() || state.inPipeline().get() > 0)) {
-            PollState<PortResult> poll = getPortResult(state);
-            switch (poll) {
-                case PollState.Success<PortResult>(PortResult value) -> accumulator.add(value);
-                case PollState.Failure(Throwable error) -> accumulator.recordFailure(error, -1);
-                case PollState.Unavailable<PortResult> ignore -> {
-                    // we do nothing
-                }
-            }
-
-        }
-    }
-
     private PollState<PortResult> getPortResult(ProducerState<PortResult> state) {
         try {
             return pollPortResult(state);
-- 
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