From 46e02524a9f22df4db8239eca5bb88e54ad7a63c Mon Sep 17 00:00:00 2001
From: Matthias Jaros <jarlucmat@mailbox.org>
Date: Fri, 21 Aug 2026 23:17:49 +0200
Subject: Replaced if else if else with switch. Added final to final variables

---
 src/main/java/com/it_jaros/jns/scan/Scanner.java              | 10 ++++++----
 .../java/com/it_jaros/jns/scan/engine/ProducerThread.java     | 10 +++++-----
 src/main/java/com/it_jaros/jns/scan/engine/ScanHostTask.java  | 11 +++++++----
 3 files changed, 18 insertions(+), 13 deletions(-)

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 32f1182..6608ee7 100644
--- a/src/main/java/com/it_jaros/jns/scan/Scanner.java
+++ b/src/main/java/com/it_jaros/jns/scan/Scanner.java
@@ -63,10 +63,12 @@ public class Scanner implements AutoCloseable {
     private void runConsumerLoop(ProducerState<ScanResult> state, Consumer<ScanResult> consumer) {
         while (state.running().get() || state.inPipeline().get() > 0) {
             PollState<ScanResult> poll = getPollStateOfScanResult(state);
-            if (poll instanceof PollState.Success<ScanResult>(ScanResult value)) {
-                consumer.accept(value);
-            } else if (poll instanceof PollState.Failure<ScanResult>(Throwable error)) {
-                mapToScanResult(error).ifPresent(consumer);
+            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
+                }
             }
         }
     }
diff --git a/src/main/java/com/it_jaros/jns/scan/engine/ProducerThread.java b/src/main/java/com/it_jaros/jns/scan/engine/ProducerThread.java
index f02e379..059c77b 100644
--- a/src/main/java/com/it_jaros/jns/scan/engine/ProducerThread.java
+++ b/src/main/java/com/it_jaros/jns/scan/engine/ProducerThread.java
@@ -36,9 +36,9 @@ public class ProducerThread {
      * @return
      */
     public <INPUT, OUTPUT> ProducerState<OUTPUT> startProducer(
-            Iterator<INPUT> queue,
-            int maxWorkers,
-            Function<INPUT, Callable<OUTPUT>> taskFactory
+            final Iterator<INPUT> queue,
+            final int maxWorkers,
+            final Function<INPUT, Callable<OUTPUT>> taskFactory
     ) {
         final AtomicInteger inPipeline = new AtomicInteger(0);
         final AtomicBoolean running = new AtomicBoolean(true);
@@ -64,13 +64,13 @@ public class ProducerThread {
         return new ProducerState<>(running, inPipeline, completionService);
     }
 
-    private <INPUT, OUTPUT> void runProducerLoop(ProducerContext<INPUT, OUTPUT> context) throws InterruptedException {
+    private <INPUT, OUTPUT> void runProducerLoop(final ProducerContext<INPUT, OUTPUT> context) throws InterruptedException {
         while (!cancelledToken.isCancelled() && context.queue().hasNext()) {
             submitNext(context);
         }
     }
 
-    private <INPUT, OUTPUT> void submitNext(ProducerContext<INPUT, OUTPUT> context) throws InterruptedException {
+    private <INPUT, OUTPUT> void submitNext(final ProducerContext<INPUT, OUTPUT> context) throws InterruptedException {
         context.activeWorkers().acquire();
 
         // just in case something
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 02834ff..f99a248 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
@@ -100,11 +100,14 @@ public class ScanHostTask implements Callable<ScanResult> {
     private void runConsumerLoop(ProducerState<PortResult> state) {
         while (state.running().get() || state.inPipeline().get() > 0) {
             PollState<PortResult> poll = getPortResult(state);
-            if (poll instanceof PollState.Success<PortResult>(PortResult value)) {
-                accumulator.add(value);
-            } else if (poll instanceof PollState.Failure(Throwable error)) {
-                accumulator.recordFailure(error, -1);
+            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
+                }
             }
+
         }
     }
 
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