Fix 0xe299233a8efdcefd seed for ShortAccordSimulationTest

src/java/org/apache/cassandra/service/accord/serializers/LatestDepsSerializers.java

@@ -44,6 +44,9 @@ public class LatestDepsSerializers
         public void serialize(LatestDeps t, DataOutputPlus out, int version) throws IOException
         {
             out.writeUnsignedVInt32(t.size());
+            if (t.size() == 0)
+                return;
+
             for (int i = 0 ; i < t.size() ; ++i)
             {
                 RoutingKey start = t.startAt(i);
@@ -68,6 +71,9 @@ public void serialize(LatestDeps t, DataOutputPlus out, int version) throws IOEx
         public LatestDeps deserialize(DataInputPlus in, int version) throws IOException
         {
             int size = in.readUnsignedVInt32();
+            if (size == 0)
+                return LatestDeps.EMPTY;
+
             RoutingKey[] starts = new RoutingKey[size + 1];
             LatestDeps.LatestEntry[] values = new LatestDeps.LatestEntry[size];
             for (int i = 0 ; i < size ; ++i)
@@ -92,6 +98,8 @@ public long serializedSize(LatestDeps t, int version)
         {
             long size = 0;
             size += TypeSizes.sizeofUnsignedVInt(t.size());
+            if (t.size() == 0)
+                return size;
             for (int i = 0 ; i < t.size() ; ++i)
             {
                 RoutingKey start = t.startAt(i);

test/unit/org/apache/cassandra/service/accord/serializers/LatestDepsSerializerTest.java

@@ -0,0 +1,70 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.cassandra.service.accord.serializers;
+
+import java.nio.ByteBuffer;
+import java.util.List;
+
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import accord.primitives.LatestDeps;
+import org.apache.cassandra.config.DatabaseDescriptor;
+import org.apache.cassandra.dht.Murmur3Partitioner;
+import org.apache.cassandra.io.util.DataInputBuffer;
+import org.apache.cassandra.io.util.DataOutputBuffer;
+
+import org.apache.cassandra.net.MessagingService.Version;
+
+import static org.apache.cassandra.net.MessagingService.Version.VERSION_51;
+
+public class LatestDepsSerializerTest
+{
+    @BeforeClass
+    public static void setup()
+    {
+        DatabaseDescriptor.clientInitialization();
+        DatabaseDescriptor.setPartitionerUnsafe(Murmur3Partitioner.instance);
+    }
+
+    private static final List<Version> SUPPORTED_VERSIONS = VERSION_51.greaterThanOrEqual();
+
+    @Test
+    public void emptySerializerTest() throws Throwable
+    {
+        for (Version ver : SUPPORTED_VERSIONS)
+        {
+            ByteBuffer bb = null;
+            try (DataOutputBuffer buf = new DataOutputBuffer())
+            {
+                long expected = LatestDepsSerializers.latestDeps.serializedSize(LatestDeps.EMPTY, ver.value);
+                LatestDepsSerializers.latestDeps.serialize(LatestDeps.EMPTY, buf, ver.value);
+                bb = buf.asNewBuffer();
+                Assert.assertEquals(expected, bb.capacity());
+            }
+
+            try (DataInputBuffer in = new DataInputBuffer(bb, false))
+            {
+                LatestDeps roundTrip = LatestDepsSerializers.latestDeps.deserialize(in, ver.value);
+                Assert.assertEquals(roundTrip, LatestDeps.EMPTY);
+            }
+        }
+    }
+}