Fixing some SonarLint findings.

TrafficCapture/captureKafkaOffloader/src/main/java/org/opensearch/migrations/trafficcapture/kafkaoffloader/KafkaCaptureFactory.java

@@ -135,12 +135,13 @@ public CodedOutputStreamWrapper createStream() {
     }
 
     // Producer Send will block on actions such as retrieving cluster metadata, allows running fully async
-    public static <K, V> CompletableFuture<RecordMetadata> sendFullyAsync(Producer<K, V> producer, ProducerRecord<K, V> record) {
+    public static <K, V> CompletableFuture<RecordMetadata> sendFullyAsync(Producer<K, V> producer,
+                                                                          ProducerRecord<K, V> kafkaRecord) {
         CompletableFuture<RecordMetadata> completableFuture = new CompletableFuture<>();
 
         ForkJoinPool.commonPool().execute(() -> {
             try {
-                producer.send(record, (metadata, exception) -> {
+                producer.send(kafkaRecord, (metadata, exception) -> {
                     if (exception != null) {
                         completableFuture.completeExceptionally(exception);
                     }

TrafficCapture/captureOffloader/src/main/java/org/opensearch/migrations/trafficcapture/StreamChannelConnectionCaptureSerializer.java

@@ -4,6 +4,8 @@
 import com.google.protobuf.Descriptors;
 import com.google.protobuf.Timestamp;
 import io.netty.buffer.ByteBuf;
+
+import java.util.function.IntSupplier;
 import java.util.function.Supplier;
 import lombok.NonNull;
 import lombok.extern.slf4j.Slf4j;
@@ -131,9 +133,9 @@ private CodedOutputStreamHolder getOrCreateCodedOutputStreamHolder() throws IOEx
         }
     }
 
-    public CompletableFuture<T> flushIfNeeded(Supplier<Integer> requiredSize) throws IOException {
+    public CompletableFuture<T> flushIfNeeded(IntSupplier requiredSize) throws IOException {
         var spaceLeft = getOrCreateCodedOutputStreamHolder().getOutputStreamSpaceLeft();
-        if (spaceLeft != -1 && spaceLeft < requiredSize.get()) {
+        if (spaceLeft != -1 && spaceLeft < requiredSize.getAsInt()) {
             return flushCommitAndResetStream(false);
         }
         return CompletableFuture.completedFuture(null);

TrafficCapture/captureOffloader/src/main/java/org/opensearch/migrations/trafficcapture/StreamLifecycleManager.java

@@ -1,6 +1,5 @@
 package org.opensearch.migrations.trafficcapture;
 
-import java.io.IOException;
 import java.util.concurrent.CompletableFuture;
 
 public interface StreamLifecycleManager<T> {

TrafficCapture/captureOffloader/src/main/java/org/opensearch/migrations/trafficcapture/tracing/IRootOffloaderContext.java

@@ -3,16 +3,5 @@
 import org.opensearch.migrations.tracing.IRootOtelContext;
 
 public interface IRootOffloaderContext extends IRootOtelContext {
-    //public static final String OFFLOADER_SCOPE_NAME = "Offloader";
     ConnectionContext.MetricInstruments getConnectionInstruments();
-
-//    public RootOffloaderContext(OpenTelemetry openTelemetry) {
-//        this(openTelemetry, OFFLOADER_SCOPE_NAME);
-//    }
-//
-//    public RootOffloaderContext(OpenTelemetry openTelemetry, String scopeName) {
-//        super(scopeName, openTelemetry);
-//        var meter = openTelemetry.getMeterProvider().get(scopeName);
-//        connectionInstruments = new ConnectionContext.MetricInstruments(meter, scopeName);
-//    }
 }

TrafficCapture/captureOffloader/src/test/java/org/opensearch/migrations/trafficcapture/StreamChannelConnectionCaptureSerializerTest.java

@@ -208,8 +208,10 @@ public void testWithLimitlessCodedOutputStreamHolder()
         var bb = Unpooled.buffer(0);
         serializer.addWriteEvent(REFERENCE_TIMESTAMP, bb);
         serializer.addWriteEvent(REFERENCE_TIMESTAMP, bb);
-        var future = serializer.flushCommitAndResetStream(true);
-        future.get();
+        Assertions.assertDoesNotThrow(()-> {
+                    var future = serializer.flushCommitAndResetStream(true);
+                    future.get();
+                });
         bb.release();
     }
 

TrafficCapture/coreUtilities/src/main/java/org/opensearch/migrations/Utils.java

@@ -6,6 +6,8 @@
 import java.util.stream.Collectors;
 
 public class Utils {
+    private Utils() {}
+
     /**
      * See https://en.wikipedia.org/wiki/Fold_(higher-order_function)
      */

TrafficCapture/coreUtilities/src/main/java/org/opensearch/migrations/tracing/ActiveContextTrackerByActivityType.java

@@ -1,7 +1,6 @@
 package org.opensearch.migrations.tracing;
 
 import java.util.Collection;
-import java.util.Comparator;
 import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;

TrafficCapture/coreUtilities/src/main/java/org/opensearch/migrations/tracing/IContextTracker.java

@@ -12,5 +12,5 @@ default void onContextCreated(IScopedInstrumentationAttributes newScopedContext)
      */
     default void onContextClosed(IScopedInstrumentationAttributes newScopedContext) {}
 
-    final static IContextTracker DO_NOTHING_TRACKER = new IContextTracker() {};
+    IContextTracker DO_NOTHING_TRACKER = new IContextTracker() {};
 }

TrafficCapture/coreUtilities/src/main/java/org/opensearch/migrations/tracing/IInstrumentConstructor.java

@@ -1,6 +1,5 @@
 package org.opensearch.migrations.tracing;
 
-import io.opentelemetry.api.common.AttributesBuilder;
 import io.opentelemetry.api.trace.Span;
 import lombok.NonNull;
 

TrafficCapture/coreUtilities/src/main/java/org/opensearch/migrations/tracing/commoncontexts/IConnectionContext.java

@@ -2,7 +2,6 @@
 
 import io.opentelemetry.api.common.AttributeKey;
 import io.opentelemetry.api.common.AttributesBuilder;
-import org.opensearch.migrations.tracing.IInstrumentationAttributes;
 import org.opensearch.migrations.tracing.IScopedInstrumentationAttributes;
 
 public interface IConnectionContext extends IScopedInstrumentationAttributes {

TrafficCapture/coreUtilities/src/testFixtures/java/org/opensearch/migrations/tracing/InMemoryInstrumentationBundle.java

@@ -110,7 +110,8 @@ public List<MetricData> getMetricsUntil(String metricName, IntStream sleepTimes,
                                     " did not").log();
                             Thread.sleep(sleepAmount);
                         } catch (InterruptedException e) {
-                            throw new RuntimeException(e);
+                            Thread.currentThread().interrupt();
+                            throw Lombok.sneakyThrow(e);
                         }
                         return false;
                     }

TrafficCapture/nettyWireLogging/src/main/java/org/opensearch/migrations/trafficcapture/netty/LoggingHttpHandler.java

@@ -192,14 +192,23 @@ public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
         super.handlerRemoved(ctx);
     }
 
+    /**
+     * This provides a callback that subclasses can use to override the default behavior of cycling the
+     * instrumentation context and continuing to read.  Subclasses may determine if additional processing
+     * or triggers should occur before proceeding, given the current context.
+     * @param ctx the instrumentation context for this request
+     * @param msg the original message, which is likely a ByteBuf, that helped to form the httpRequest
+     * @param shouldCapture false if the current request has been determined to be ignorable
+     * @param httpRequest the request that has just been fully received (excluding its body)
+     */
     protected void channelFinishedReadingAnHttpMessage(ChannelHandlerContext ctx, Object msg, boolean shouldCapture,
                                                        HttpRequest httpRequest) throws Exception {
         messageContext = messageContext.createWaitingForResponseContext();
         super.channelRead(ctx, msg);
     }
 
     @Override
-    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+    public void channelRead(@NonNull ChannelHandlerContext ctx, @NonNull Object msg) throws Exception {
         IWireCaptureContexts.IRequestContext requestContext;
         if (!(messageContext instanceof IWireCaptureContexts.IRequestContext)) {
             messageContext = requestContext = messageContext.createNextRequestContext();

TrafficCapture/nettyWireLogging/src/main/java/org/opensearch/migrations/trafficcapture/netty/PassThruHttpHeaders.java

@@ -31,6 +31,16 @@
         this.mapWithCaseInsensitiveHeaders = headersToPreserve.caseInsensitiveHeadersMap;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        throw new IllegalStateException("equals() is not supported for this stripped-down version of HttpHeaders");
+    }
+
+    @Override
+    public int hashCode() {
+        throw new IllegalStateException("hashCode() is not supported for this stripped-down version of HttpHeaders");
+    }
+
     private boolean headerNameShouldBeTracked(CharSequence name) {
         return mapWithCaseInsensitiveHeaders.contains(name);
     }

TrafficCapture/nettyWireLogging/src/test/java/org/opensearch/migrations/trafficcapture/netty/ConditionallyReliableLoggingHttpHandlerTest.java

@@ -189,7 +189,7 @@ private static Consumer<EmbeddedChannel> getSingleByteAtATimeWriter(boolean useP
     // This test doesn't work yet, but this is an optimization.  Getting connections with only a
     // close observation is already a common occurrence.  This is nice to have, so it's good to
     // keep this warm and ready, but we don't need the feature for correctness.
-    @Disabled
+    @Disabled("This is for an optimization that isn't functional yet")
     @Test
     @ValueSource(booleans = {false, true})
     public void testThatSuppressedCaptureWorks() throws Exception {

TrafficCapture/trafficCaptureProxyServer/src/main/java/org/opensearch/migrations/trafficcapture/proxyserver/netty/BacksideHandler.java

@@ -38,8 +38,7 @@
 
     @Override
     public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
-        log.atError().setCause(cause).setMessage("Caught error").log();
-        String channelId = ctx.channel().id().asLongText();
+        log.atError().setCause(cause).setMessage("Caught error for channel: " + ctx.channel().id().asLongText()).log();
         FrontsideHandler.closeAndFlush(ctx.channel());
     }
 }

TrafficCapture/trafficCaptureProxyServer/src/main/java/org/opensearch/migrations/trafficcapture/proxyserver/netty/ExpiringSubstitutableItemPool.java

@@ -41,11 +41,9 @@ public Entry(F future) {
 
         @Override
         public String toString() {
-            final StringBuilder sb = new StringBuilder("Entry{");
-            sb.append("timestamp=").append(timestamp);
-            sb.append(", value=").append(future);
-            sb.append('}');
-            return sb.toString();
+            return "Entry{" + "timestamp=" + timestamp +
+                    ", value=" + future +
+                    '}';
         }
     }
 
@@ -150,8 +148,8 @@ private void addExpiredItem() {
     private final Consumer<F> onExpirationConsumer;
     @Getter
     private final EventLoop eventLoop;
-    private Duration inactivityTimeout;
-    private GenericFutureListener<F> shuffleInProgressToReady;
+    private final Duration inactivityTimeout;
+    private final GenericFutureListener<F> shuffleInProgressToReady;
     private final Stats stats;
     private int poolSize;
 
@@ -305,7 +303,7 @@ private void beginLoadingNewItemIfNecessary() {
     @Override
     @SneakyThrows
     public String toString() {
-        return eventLoop.submit(() -> toStringOnThread()).get();
+        return eventLoop.submit(this::toStringOnThread).get();
     }
 
     private String toStringOnThread() {

TrafficCapture/trafficReplayer/src/main/java/org/opensearch/migrations/replay/CapturedTrafficToHttpTransactionAccumulator.java

@@ -128,7 +128,7 @@ public void onTrafficStreamsExpired(RequestResponsePacketPair.ReconstructionStat
         public void onTrafficStreamIgnored(@NonNull ITrafficStreamKey tsk) {
             underlying.onTrafficStreamIgnored(tsk.getTrafficStreamsContext());
         }
-    };
+    }
 
     public int numberOfConnectionsCreated() { return liveStreams.numberOfConnectionsCreated(); }
     public int numberOfRequestsOnReusedConnections() { return reusedKeepAliveCounter.get(); }
@@ -361,7 +361,7 @@ private Optional<CONNECTION_STATUS> handleObservationForWriteState(Accumulation
     private void handleDroppedRequestForAccumulation(Accumulation accum) {
         if (accum.hasRrPair()) {
             var rrPair = accum.getRrPair();
-            rrPair.getTrafficStreamsHeld().forEach(tsk->listener.onTrafficStreamIgnored(tsk));
+            rrPair.getTrafficStreamsHeld().forEach(listener::onTrafficStreamIgnored);
         }
         log.atTrace().setMessage(()->"resetting to forget "+ accum.trafficChannelKey).log();
         accum.resetToIgnoreAndForgetCurrentRequest();

TrafficCapture/trafficReplayer/src/main/java/org/opensearch/migrations/replay/KafkaPrinter.java

@@ -15,6 +15,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
@@ -194,7 +195,7 @@ public static void main(String[] args) throws FileNotFoundException {
         }
 
         String baseOutputPath = params.outputDirectoryPath == null ? "./" : params.outputDirectoryPath;
-        baseOutputPath = !baseOutputPath.endsWith("/") ? baseOutputPath + "/" : baseOutputPath;
+        baseOutputPath = !baseOutputPath.endsWith(File.separator) ? baseOutputPath + File.separator : baseOutputPath;
         String uuid = UUID.randomUUID().toString();
         boolean separatePartitionOutputs = false;
         Map<Integer, CodedOutputStream> partitionOutputStreams = new HashMap<>();

TrafficCapture/trafficReplayer/src/main/java/org/opensearch/migrations/replay/TrafficReplayerCore.java

@@ -111,16 +111,15 @@
             var requestPushFuture = new StringTrackableCompletableFuture<TransformedTargetRequestAndResponse>(
                     new CompletableFuture<>(), () -> "Waiting to get response from target");
             var requestKey = ctx.getReplayerRequestKey();
-            liveTrafficStreamLimiter.queueWork(1, ctx, wi -> {
+            liveTrafficStreamLimiter.queueWork(1, ctx, wi ->
                 transformAndSendRequest(replayEngine, request, ctx).future.whenComplete((v,t)->{
                     liveTrafficStreamLimiter.doneProcessing(wi);
                     if (t != null) {
                         requestPushFuture.future.completeExceptionally(t);
                     } else {
                         requestPushFuture.future.complete(v);
                     }
-                });
-            });
+                }));
             if (!allWorkFinishedForTransaction.future.isDone()) {
                 log.trace("Adding " + requestKey + " to targetTransactionInProgressMap");
                 requestWorkTracker.put(requestKey, allWorkFinishedForTransaction);
@@ -222,9 +221,8 @@
                                       @NonNull Instant timestamp, @NonNull List<ITrafficStreamKey> trafficStreamKeysBeingHeld) {
             replayEngine.setFirstTimestamp(timestamp);
             var cf = replayEngine.closeConnection(channelInteractionNum, ctx, channelSessionNumber, timestamp);
-            cf.map(f->f.whenComplete((v,t)->{
-                commitTrafficStreams(status, trafficStreamKeysBeingHeld);
-            }), ()->"closing the channel in the ReplayEngine");
+            cf.map(f->f.whenComplete((v,t) -> commitTrafficStreams(status, trafficStreamKeysBeingHeld)),
+                    ()->"closing the channel in the ReplayEngine");
         }
 
         @Override

TrafficCapture/trafficReplayer/src/main/java/org/opensearch/migrations/replay/datahandlers/NettyPacketToHttpConsumer.java

@@ -304,7 +304,6 @@ private IReplayContexts.IReplayerHttpTransactionContext httpContext() {
     writePacketAndUpdateFuture(ByteBuf packetData) {
         final var completableFuture = new DiagnosticTrackableCompletableFuture<String, Void>(new CompletableFuture<>(),
                 ()->"CompletableFuture that will wait for the netty future to fill in the completion value");
-        final int readableBytes = packetData.readableBytes();
         channel.writeAndFlush(packetData)
                 .addListener((ChannelFutureListener) future -> {
                     Throwable cause = null;

TrafficCapture/trafficReplayer/src/main/java/org/opensearch/migrations/replay/datatypes/RawPackets.java

@@ -1,6 +1,5 @@
 package org.opensearch.migrations.replay.datatypes;
 
-import lombok.EqualsAndHashCode;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -21,4 +20,13 @@
         }
         return true;
     }
+
+    @Override
+    public int hashCode() {
+        int result = 29;
+        for (byte[] array : this) {
+            result = 31 * result + Arrays.hashCode(array);
+        }
+        return result;
+    }
 }

TrafficCapture/trafficReplayer/src/main/java/org/opensearch/migrations/replay/datatypes/TimeToResponseFulfillmentFutureMap.java

@@ -3,6 +3,7 @@
 import java.time.Instant;
 import java.util.AbstractMap;
 import java.util.ArrayDeque;
+import java.util.Collection;
 import java.util.Map;
 import java.util.StringJoiner;
 import java.util.TreeMap;
@@ -45,9 +46,8 @@
             return false;
         } else {
             return timeToRunnableMap.values().stream()
-                    .flatMap(d->d.stream())
-                    .filter(ct->ct.kind==ChannelTaskType.TRANSMIT)
-                    .findAny().isPresent();
+                    .flatMap(Collection::stream)
+                    .anyMatch(ct->ct.kind==ChannelTaskType.TRANSMIT);
         }
     }
 

TrafficCapture/trafficReplayer/src/main/java/org/opensearch/migrations/replay/kafka/TrackingKafkaConsumer.java

@@ -197,7 +197,7 @@ public void touch(ITrafficSourceContexts.IBackPressureBlockContext context) {
             } finally {
                 resume();
             }
-            safeCommit(()->context.createCommitContext());
+            safeCommit(context::createCommitContext);
             lastTouchTimeRef.set(clock.instant());
         }
     }
@@ -244,9 +244,9 @@ private Collection<TopicPartition> getActivePartitions() {
     public <T> Stream<T>
     getNextBatchOfRecords(ITrafficSourceContexts.IReadChunkContext context,
                           BiFunction<KafkaCommitOffsetData, ConsumerRecord<String,byte[]>, T> builder) {
-        safeCommit(()->context.createCommitContext());
+        safeCommit(context::createCommitContext);
         var records = safePollWithSwallowedRuntimeExceptions(context);
-        safeCommit(()->context.createCommitContext());
+        safeCommit(context::createCommitContext);
         return applyBuilder(builder, records);
     }
 
@@ -299,7 +299,7 @@ ITrafficCaptureSource.CommitResult commitKafkaKey(ITrafficStreamKey streamKey, K
                     + ").  Dropping this commit request since the record would " +
                     "have been handled again by a current consumer within this process or another. Full key=" +
                     kafkaTsk).log();
-            return ITrafficCaptureSource.CommitResult.Ignored;
+            return ITrafficCaptureSource.CommitResult.IGNORED;
         }
 
         var p = kafkaTsk.getPartition();
@@ -315,12 +315,12 @@ ITrafficCaptureSource.CommitResult commitKafkaKey(ITrafficStreamKey streamKey, K
                 addKeyContextForEventualCommit(streamKey, kafkaTsk, k);
                 nextSetOfCommitsMap.put(k, v);
             }
-            return ITrafficCaptureSource.CommitResult.AfterNextRead;
+            return ITrafficCaptureSource.CommitResult.AFTER_NEXT_READ;
         }).orElseGet(() -> {
             synchronized (commitDataLock) {
                 addKeyContextForEventualCommit(streamKey, kafkaTsk, k);
             }
-            return ITrafficCaptureSource.CommitResult.BlockedByOtherCommits;
+            return ITrafficCaptureSource.CommitResult.BLOCKED_BY_OTHER_COMMITS;
         });
     }
 

TrafficCapture/trafficReplayer/src/main/java/org/opensearch/migrations/replay/tracing/TrafficSourceContexts.java

@@ -4,7 +4,6 @@
 import lombok.NonNull;
 import org.opensearch.migrations.tracing.BaseNestedSpanContext;
 import org.opensearch.migrations.tracing.CommonScopedMetricInstruments;
-import org.opensearch.migrations.tracing.IInstrumentationAttributes;
 import org.opensearch.migrations.tracing.IScopedInstrumentationAttributes;
 
 public class TrafficSourceContexts {