fix: Add copyright notice, use file-scoped namespaces, avoid binary breaking change

Signed-off-by: Jon Abaunza <j.abaunza@lantek.com>

src/CloudNative.CloudEvents.Kafka/CloudNative.CloudEvents.Kafka.csproj

@@ -4,7 +4,7 @@
     <TargetFrameworks>netstandard2.0;netstandard2.1;net8.0</TargetFrameworks>
     <Description>Kafka extensions for CloudNative.CloudEvents</Description>
     <PackageTags>cncf;cloudnative;cloudevents;events;kafka</PackageTags>
-    <LangVersion>9.0</LangVersion>
+    <LangVersion>10.0</LangVersion>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 

src/CloudNative.CloudEvents.Kafka/KafkaExtensions.cs

@@ -25,6 +25,7 @@ namespace CloudNative.CloudEvents.Kafka
         internal const string KafkaContentTypeAttributeName = "content-type";
         private const string SpecVersionKafkaHeader = KafkaHeaderPrefix + "specversion";
 
+
         /// <summary>
         /// Indicates whether this message holds a single CloudEvent.
         /// </summary>
@@ -33,6 +34,17 @@ namespace CloudNative.CloudEvents.Kafka
         /// </remarks>
         /// <param name="message">The message to check for the presence of a CloudEvent. Must not be null.</param>
         /// <returns>true, if the request is a CloudEvent</returns>
+        public static bool IsCloudEvent(this Message<string?, byte[]> message) => IsCloudEvent<string?>(message);
+
+        /// <summary>
+        /// Indicates whether this message holds a single CloudEvent.
+        /// </summary>
+        /// <remarks>
+        /// This method returns false for batch requests, as they need to be parsed differently.
+        /// </remarks>
+        /// <param name="message">The message to check for the presence of a CloudEvent. Must not be null.</param>
+        /// <typeparam name="TKey">The type of key of the Kafka message.</typeparam>
+        /// <returns>true, if the request is a CloudEvent</returns>
         public static bool IsCloudEvent<TKey>(this Message<TKey, byte[]> message) =>
             GetHeaderValue(message, SpecVersionKafkaHeader) is object ||
             MimeUtilities.IsCloudEventsContentType(GetHeaderValue(message, KafkaContentTypeAttributeName));

src/CloudNative.CloudEvents.Kafka/PartitionKeyAdapters/BinaryGuidPartitionKeyAdapter.cs

@@ -1,36 +1,39 @@
+// Copyright (c) Cloud Native Foundation.
+// Licensed under the Apache 2.0 license.
+// See LICENSE file in the project root for full license information.
+
 using System;
 
-namespace CloudNative.CloudEvents.Kafka.PartitionKeyAdapters
+namespace CloudNative.CloudEvents.Kafka.PartitionKeyAdapters;
+
+/// <summary>
+/// Partion Key Adapter that converts to and from Guids in binary representation.
+/// </summary>
+public class BinaryGuidPartitionKeyAdapter : IPartitionKeyAdapter<byte[]?>
 {
-    /// <summary>
+    /// <inheritdoc/>
-    /// Partion Key Adapter that converts to and from Guids in binary representation.
+    public bool ConvertKeyToPartitionKeyAttributeValue(byte[]? keyValue, out string? attributeValue)
-    /// </summary>
-    public class BinaryGuidPartitionKeyAdapter : IPartitionKeyAdapter<byte[]?>
     {
-        /// <inheritdoc/>
+        if (keyValue == null)
-        public bool ConvertKeyToPartitionKeyAttributeValue(byte[]? keyValue, out string? attributeValue)
         {
-            if (keyValue == null)
+            attributeValue = null;
-            {
+            return false;
-                attributeValue = null;
-                return false;
-            }
-
-            attributeValue = new Guid(keyValue).ToString();
-            return true;
         }
 
-        /// <inheritdoc/>
+        attributeValue = new Guid(keyValue).ToString();
-        public bool ConvertPartitionKeyAttributeValueToKey(string? attributeValue, out byte[]? keyValue)
+        return true;
-        {
+    }
-            if (string.IsNullOrEmpty(attributeValue))
-            {
-                keyValue = default;
-                return false;
-            }
 
-            keyValue = Guid.Parse(attributeValue).ToByteArray();
+    /// <inheritdoc/>
-            return true;
+    public bool ConvertPartitionKeyAttributeValueToKey(string? attributeValue, out byte[]? keyValue)
+    {
+        if (string.IsNullOrEmpty(attributeValue))
+        {
+            keyValue = default;
+            return false;
         }
+
+        keyValue = Guid.Parse(attributeValue).ToByteArray();
+        return true;
     }
 }

src/CloudNative.CloudEvents.Kafka/PartitionKeyAdapters/IPartitionKeyAdapter.cs

@@ -1,26 +1,29 @@
-namespace CloudNative.CloudEvents.Kafka.PartitionKeyAdapters
+// Copyright (c) Cloud Native Foundation.
+// Licensed under the Apache 2.0 license.
+// See LICENSE file in the project root for full license information.
+
+namespace CloudNative.CloudEvents.Kafka.PartitionKeyAdapters;
+
+/// <summary>
+/// Defines the methods of the adapters responsible for transforming from cloud event
+/// PartitionKey Attribute to Kafka Message Key.
+/// </summary>
+/// <typeparam name="TKey">The type of Kafka Message Key.</typeparam>
+public interface IPartitionKeyAdapter<TKey>
 {
     /// <summary>
-    /// Defines the methods of the adapters responsible for transforming from cloud event
+    /// Converts a Message Key to PartionKey Attribute Value.
-    /// PartitionKey Attribute to Kafka Message Key.
     /// </summary>
-    /// <typeparam name="TKey"></typeparam>
+    /// <param name="keyValue">The key value to transform.</param>
-    public interface IPartitionKeyAdapter<TKey>
+    /// <param name="attributeValue">The transformed attribute value (output).</param>
-    {
+    /// <returns>Whether the attribute should be set.</returns>
-        /// <summary>
+    bool ConvertKeyToPartitionKeyAttributeValue(TKey keyValue, out string? attributeValue);
-        /// Converts a Message Key to PartionKey Attribute Value.
-        /// </summary>
-        /// <param name="keyValue">The key value to transform.</param>
-        /// <param name="attributeValue">The transformed attribute value (output).</param>
-        /// <returns>Whether the attribute should be set.</returns>
-        bool ConvertKeyToPartitionKeyAttributeValue(TKey keyValue, out string? attributeValue);
 
-        /// <summary>
+    /// <summary>
-        /// Converts a PartitionKey Attribute value to a Message Key.
+    /// Converts a PartitionKey Attribute value to a Message Key.
-        /// </summary>
+    /// </summary>
-        /// <param name="attributeValue">The attribute value to transform.</param>
+    /// <param name="attributeValue">The attribute value to transform.</param>
-        /// <param name="keyValue">The transformed key value (output)</param>
+    /// <param name="keyValue">The transformed key value (output)</param>
-        /// <returns>Whether the key should be set.</returns>
+    /// <returns>Whether the key should be set.</returns>
-        bool ConvertPartitionKeyAttributeValueToKey(string? attributeValue, out TKey? keyValue);
+    bool ConvertPartitionKeyAttributeValueToKey(string? attributeValue, out TKey? keyValue);
-    }
 }

src/CloudNative.CloudEvents.Kafka/PartitionKeyAdapters/NullPartitionKeyAdapter.cs

@@ -1,23 +1,26 @@
-namespace CloudNative.CloudEvents.Kafka.PartitionKeyAdapters
+// Copyright (c) Cloud Native Foundation.
-{
+// Licensed under the Apache 2.0 license.
-    /// <summary>
+// See LICENSE file in the project root for full license information.
-    /// Partion Key Adapter that skips handling the key.
-    /// </summary>
-    /// <typeparam name="TKey">The type of Kafka Message Key</typeparam>
-    public class NullPartitionKeyAdapter<TKey> : IPartitionKeyAdapter<TKey>
-    {
-        /// <inheritdoc/>
-        public bool ConvertKeyToPartitionKeyAttributeValue(TKey keyValue, out string? attributeValue)
-        {
-            attributeValue = null;
-            return false;
-        }
 
-        /// <inheritdoc/>
+namespace CloudNative.CloudEvents.Kafka.PartitionKeyAdapters;
-        public bool ConvertPartitionKeyAttributeValueToKey(string? attributeValue, out TKey? keyValue)
+
-        {
+/// <summary>
-            keyValue = default;
+/// Partion Key Adapter that skips handling the key.
-            return false;
+/// </summary>
-        }
+/// <typeparam name="TKey">The type of Kafka Message Key.</typeparam>
+public class NullPartitionKeyAdapter<TKey> : IPartitionKeyAdapter<TKey>
+{
+    /// <inheritdoc/>
+    public bool ConvertKeyToPartitionKeyAttributeValue(TKey keyValue, out string? attributeValue)
+    {
+        attributeValue = null;
+        return false;
+    }
+
+    /// <inheritdoc/>
+    public bool ConvertPartitionKeyAttributeValueToKey(string? attributeValue, out TKey? keyValue)
+    {
+        keyValue = default;
+        return false;
     }
 }

src/CloudNative.CloudEvents.Kafka/PartitionKeyAdapters/StringPartitionKeyAdapter.cs

@@ -1,22 +1,25 @@
-namespace CloudNative.CloudEvents.Kafka.PartitionKeyAdapters
+// Copyright (c) Cloud Native Foundation.
-{
+// Licensed under the Apache 2.0 license.
-    /// <summary>
+// See LICENSE file in the project root for full license information.
-    /// Partion Key Adapter that skips handling the key.
-    /// </summary>
-    public class StringPartitionKeyAdapter : IPartitionKeyAdapter<string?>
-    { 
-        /// <inheritdoc/>
-        public bool ConvertKeyToPartitionKeyAttributeValue(string? keyValue, out string? attributeValue)
-        {
-            attributeValue = keyValue;
-            return true;
-        }
 
-        /// <inheritdoc/>
+namespace CloudNative.CloudEvents.Kafka.PartitionKeyAdapters;
-        public bool ConvertPartitionKeyAttributeValueToKey(string? attributeValue, out string? keyValue)
+
-        {
+/// <summary>
-            keyValue = attributeValue;
+/// Partion Key Adapter that skips handling the key.
-            return true;
+/// </summary>
-        }
+public class StringPartitionKeyAdapter : IPartitionKeyAdapter<string?>
+{ 
+    /// <inheritdoc/>
+    public bool ConvertKeyToPartitionKeyAttributeValue(string? keyValue, out string? attributeValue)
+    {
+        attributeValue = keyValue;
+        return true;
+    }
+
+    /// <inheritdoc/>
+    public bool ConvertPartitionKeyAttributeValueToKey(string? attributeValue, out string? keyValue)
+    {
+        keyValue = attributeValue;
+        return true;
     }
 }

test/CloudNative.CloudEvents.UnitTests/Kafka/KafkaTest.cs

@@ -140,7 +140,6 @@ namespace CloudNative.CloudEvents.Kafka.UnitTests
         public void KafkaNullKeyedStructuredMessageTest()
         {
             // It will test the serialization using Confluent's Confluent.Kafka.Null type for the key.
-            // As the default behavior without adapter is to skip the key it will work properly.
             var partitionKeyAdapter = new PartitionKeyAdapters.NullPartitionKeyAdapter<Confluent.Kafka.Null>();
             var jsonEventFormatter = new JsonEventFormatter();
             var cloudEvent = CreateTestCloudEvent();