exceptionfactory commented on code in PR #10443:
URL: https://github.com/apache/nifi/pull/10443#discussion_r2446673119


##########
nifi-extension-bundles/nifi-aws-bundle/nifi-aws-kinesis/src/test/java/org/apache/nifi/processors/aws/kinesis/converter/InjectMetadataRecordConverterTest.java:
##########
@@ -0,0 +1,135 @@
+/*
+ * 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.nifi.processors.aws.kinesis.converter;
+
+import jakarta.annotation.Nullable;
+import org.apache.nifi.serialization.SimpleRecordSchema;
+import org.apache.nifi.serialization.record.MapRecord;
+import org.apache.nifi.serialization.record.Record;
+import org.apache.nifi.serialization.record.RecordField;
+import org.apache.nifi.serialization.record.RecordFieldType;
+import org.apache.nifi.serialization.record.RecordSchema;
+import org.junit.jupiter.api.Test;
+import software.amazon.kinesis.retrieval.KinesisClientRecord;
+
+import java.nio.ByteBuffer;
+import java.time.Instant;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+class InjectMetadataRecordConverterTest {
+
+    private static final String KINESIS_METADATA = "kinesisMetadata";
+
+    private static final String TEST_STREAM_NAME = "test-stream";
+    private static final String TEST_SHARD_ID = "shardId-000000000001";
+    private static final String TEST_SEQUENCE_NUMBER = 
"49590338271490256608559692538361571095921575989136588801";
+    private static final long TEST_SUB_SEQUENCE_NUMBER = 2;
+    private static final String TEST_PARTITION_KEY = "test-partition-key";
+    private static final Instant TEST_ARRIVAL_TIMESTAMP = 
Instant.ofEpochMilli(1640995200000L);
+
+    private static final String EXPECTED_SHARDED_SEQUENCE_NUMBER = 
"4959033827149025660855969253836157109592157598913658880100000000000000000002";
+
+    private static final RecordSchema INPUT_SCHEMA = new 
SimpleRecordSchema(List.of(
+            new RecordField("name", RecordFieldType.STRING.getDataType()),
+            new RecordField("age", RecordFieldType.INT.getDataType())
+    ));
+    private static final Record INPUT_RECORD = new MapRecord(INPUT_SCHEMA, 
Map.of(
+            "name", "John Doe",
+            "age", 30
+    ));
+
+    private static final RecordSchema SCHEMA_METADATA = new 
SimpleRecordSchema(List.of(
+            new RecordField("stream", RecordFieldType.STRING.getDataType()),
+            new RecordField("shardId", RecordFieldType.STRING.getDataType()),
+            new RecordField("sequenceNumber", 
RecordFieldType.STRING.getDataType()),
+            new RecordField("subSequenceNumber", 
RecordFieldType.LONG.getDataType()),
+            new RecordField("shardedSequenceNumber", 
RecordFieldType.STRING.getDataType()),
+            new RecordField("partitionKey", 
RecordFieldType.STRING.getDataType()),
+            new RecordField("approximateArrival", 
RecordFieldType.TIMESTAMP.getDataType())
+    ));
+    private static final RecordSchema EXPECTED_SCHEMA = new 
SimpleRecordSchema(List.of(
+            new RecordField("name", RecordFieldType.STRING.getDataType()),
+            new RecordField("age", RecordFieldType.INT.getDataType()),
+            new RecordField(KINESIS_METADATA, 
RecordFieldType.RECORD.getRecordDataType(SCHEMA_METADATA))
+    ));
+
+    private static final InjectMetadataRecordConverter CONVERTER = new 
InjectMetadataRecordConverter();
+
+    @Test
+    void testConvertWithApproximateArrivalTimestamp() {
+        final KinesisClientRecord kinesisRecord = 
createTestKinesisRecord(TEST_ARRIVAL_TIMESTAMP);
+
+        final Record record = CONVERTER.convert(INPUT_RECORD, kinesisRecord, 
TEST_STREAM_NAME, TEST_SHARD_ID);
+
+        assertEquals(EXPECTED_SCHEMA, record.getSchema());
+
+        final Map<String, Object> recordValues = new HashMap<>(record.toMap());
+        recordValues.remove(KINESIS_METADATA);
+        assertEquals(INPUT_RECORD.toMap(), recordValues);
+
+        final Record metadata = record.getAsRecord(KINESIS_METADATA, 
SCHEMA_METADATA);
+        final boolean expectTimestamp = true;
+        verifyMetadata(metadata, expectTimestamp);
+    }
+
+    @Test
+    void testConvertWithoutApproximateArrivalTimestamp() {
+        final KinesisClientRecord kinesisRecord = 
createTestKinesisRecord(null);
+
+        final Record record = CONVERTER.convert(INPUT_RECORD, kinesisRecord, 
TEST_STREAM_NAME, TEST_SHARD_ID);
+
+        assertEquals(EXPECTED_SCHEMA, record.getSchema());
+
+        final Map<String, Object> recordValues = new HashMap<>(record.toMap());
+        recordValues.remove(KINESIS_METADATA);
+        assertEquals(INPUT_RECORD.toMap(), recordValues);
+
+        final Record metadata = record.getAsRecord(KINESIS_METADATA, 
SCHEMA_METADATA);
+        final boolean expectTimestamp = false;
+        verifyMetadata(metadata, expectTimestamp);
+    }
+
+    private KinesisClientRecord createTestKinesisRecord(final @Nullable 
Instant arrivalTimestamp) {
+        return KinesisClientRecord.builder()
+                .data(ByteBuffer.allocate(0))
+                .sequenceNumber(TEST_SEQUENCE_NUMBER)
+                .subSequenceNumber(TEST_SUB_SEQUENCE_NUMBER)
+                .partitionKey(TEST_PARTITION_KEY)
+                .approximateArrivalTimestamp(arrivalTimestamp)
+                .build();
+    }
+
+    private static void verifyMetadata(final Record metadata, final boolean 
expectTimestamp) {
+        assertEquals(TEST_STREAM_NAME, metadata.getValue("stream"));
+        assertEquals(TEST_SHARD_ID, metadata.getValue("shardId"));
+        assertEquals(TEST_SEQUENCE_NUMBER, 
metadata.getValue("sequenceNumber"));
+        assertEquals(TEST_SUB_SEQUENCE_NUMBER, 
metadata.getValue("subSequenceNumber"));
+        assertEquals(EXPECTED_SHARDED_SEQUENCE_NUMBER, 
metadata.getValue("shardedSequenceNumber"));
+        assertEquals(TEST_PARTITION_KEY, metadata.getValue("partitionKey"));
+
+        if (expectTimestamp) {
+            assertEquals(TEST_ARRIVAL_TIMESTAMP.toEpochMilli(), 
metadata.getValue("approximateArrival"));

Review Comment:
   I recommend declaring `approximateArrival` as a static string and reusing 
the reference in this method and other methods.



##########
nifi-extension-bundles/nifi-aws-bundle/nifi-aws-kinesis/src/main/java/org/apache/nifi/processors/aws/kinesis/ConsumeKinesis.java:
##########
@@ -732,6 +754,36 @@ public String getDescription() {
         }
     }
 
+    enum OutputStrategy implements DescribedValue {
+        USE_VALUE("Use Content as Value", "Write only the Kinesis Record value 
to the FlowFile record."),
+        USE_WRAPPER("Use Wrapper", "Write the Kinesis Record value and 
metadata into the FlowFile record. (See processor's additional details for more 
information.)"),

Review Comment:
   ```suggestion
           USE_WRAPPER("Use Wrapper", "Write the Kinesis Record value and 
metadata into the FlowFile record. See additional details for more 
information."),
   ```



##########
nifi-extension-bundles/nifi-aws-bundle/nifi-aws-kinesis/src/test/java/org/apache/nifi/processors/aws/kinesis/converter/WrapperRecordConverterTest.java:
##########
@@ -0,0 +1,127 @@
+/*
+ * 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.nifi.processors.aws.kinesis.converter;
+
+import jakarta.annotation.Nullable;
+import org.apache.nifi.serialization.SimpleRecordSchema;
+import org.apache.nifi.serialization.record.MapRecord;
+import org.apache.nifi.serialization.record.Record;
+import org.apache.nifi.serialization.record.RecordField;
+import org.apache.nifi.serialization.record.RecordFieldType;
+import org.apache.nifi.serialization.record.RecordSchema;
+import org.junit.jupiter.api.Test;
+import software.amazon.kinesis.retrieval.KinesisClientRecord;
+
+import java.nio.ByteBuffer;
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+class WrapperRecordConverterTest {
+
+    private static final String KINESIS_METADATA = "kinesisMetadata";
+
+    private static final String TEST_STREAM_NAME = "test-stream";
+    private static final String TEST_SHARD_ID = "shardId-000000000001";
+    private static final String TEST_SEQUENCE_NUMBER = 
"49590338271490256608559692538361571095921575989136588801";
+    private static final long TEST_SUB_SEQUENCE_NUMBER = 2;
+    private static final String TEST_PARTITION_KEY = "test-partition-key";
+    private static final Instant TEST_ARRIVAL_TIMESTAMP = 
Instant.ofEpochMilli(1640995200000L);
+
+    private static final String EXPECTED_SHARDED_SEQUENCE_NUMBER = 
"4959033827149025660855969253836157109592157598913658880100000000000000000002";
+
+    private static final RecordSchema INPUT_SCHEMA = new 
SimpleRecordSchema(List.of(
+            new RecordField("name", RecordFieldType.STRING.getDataType()),
+            new RecordField("age", RecordFieldType.INT.getDataType())
+    ));
+    private static final Record INPUT_RECORD = new MapRecord(INPUT_SCHEMA, 
Map.of(
+            "name", "John Doe",
+            "age", 30
+    ));
+
+    private static final RecordSchema SCHEMA_METADATA = new 
SimpleRecordSchema(List.of(
+            new RecordField("stream", RecordFieldType.STRING.getDataType()),
+            new RecordField("shardId", RecordFieldType.STRING.getDataType()),
+            new RecordField("sequenceNumber", 
RecordFieldType.STRING.getDataType()),
+            new RecordField("subSequenceNumber", 
RecordFieldType.LONG.getDataType()),
+            new RecordField("shardedSequenceNumber", 
RecordFieldType.STRING.getDataType()),
+            new RecordField("partitionKey", 
RecordFieldType.STRING.getDataType()),
+            new RecordField("approximateArrival", 
RecordFieldType.TIMESTAMP.getDataType())
+    ));
+    private static final RecordSchema EXPECTED_SCHEMA = new 
SimpleRecordSchema(List.of(
+            new RecordField(KINESIS_METADATA, 
RecordFieldType.RECORD.getRecordDataType(SCHEMA_METADATA)),
+            new RecordField("value", 
RecordFieldType.RECORD.getRecordDataType(INPUT_SCHEMA))
+    ));
+
+    private static final WrapperRecordConverter CONVERTER = new 
WrapperRecordConverter();
+
+    @Test
+    void testConvertWithApproximateArrivalTimestamp() {
+        final KinesisClientRecord kinesisRecord = 
createTestKinesisRecord(TEST_ARRIVAL_TIMESTAMP);
+
+        final Record record = CONVERTER.convert(INPUT_RECORD, kinesisRecord, 
TEST_STREAM_NAME, TEST_SHARD_ID);
+
+        assertEquals(EXPECTED_SCHEMA, record.getSchema());
+        assertEquals(INPUT_RECORD, record.getValue("value"));
+
+        final Record metadata = record.getAsRecord(KINESIS_METADATA, 
SCHEMA_METADATA);
+        final boolean expectTimestamp = true;
+        verifyMetadata(metadata, expectTimestamp);
+    }
+
+    @Test
+    void testConvertWithoutApproximateArrivalTimestamp() {
+        final KinesisClientRecord kinesisRecord = 
createTestKinesisRecord(null);
+
+        final Record record = CONVERTER.convert(INPUT_RECORD, kinesisRecord, 
TEST_STREAM_NAME, TEST_SHARD_ID);
+
+        assertEquals(EXPECTED_SCHEMA, record.getSchema());
+        assertEquals(INPUT_RECORD, record.getValue("value"));
+
+        final Record metadata = record.getAsRecord(KINESIS_METADATA, 
SCHEMA_METADATA);
+        final boolean expectTimestamp = false;
+        verifyMetadata(metadata, expectTimestamp);
+    }
+
+    private KinesisClientRecord createTestKinesisRecord(final @Nullable 
Instant arrivalTimestamp) {
+        return KinesisClientRecord.builder()
+                .data(ByteBuffer.allocate(0))
+                .sequenceNumber(TEST_SEQUENCE_NUMBER)
+                .subSequenceNumber(TEST_SUB_SEQUENCE_NUMBER)
+                .partitionKey(TEST_PARTITION_KEY)
+                .approximateArrivalTimestamp(arrivalTimestamp)
+                .build();
+    }
+
+    private static void verifyMetadata(final Record metadata, final boolean 
expectTimestamp) {

Review Comment:
   With the similarities to the `InjectMetadata` test class, what do you think 
about creating a shared utility test class for verifying these metadata values?



##########
nifi-extension-bundles/nifi-aws-bundle/nifi-aws-kinesis/src/main/java/org/apache/nifi/processors/aws/kinesis/ConsumeKinesis.java:
##########
@@ -732,6 +754,36 @@ public String getDescription() {
         }
     }
 
+    enum OutputStrategy implements DescribedValue {
+        USE_VALUE("Use Content as Value", "Write only the Kinesis Record value 
to the FlowFile record."),
+        USE_WRAPPER("Use Wrapper", "Write the Kinesis Record value and 
metadata into the FlowFile record. (See processor's additional details for more 
information.)"),
+        INJECT_METADATA("Inject Metadata",
+                "Write the Kinesis Record value to the FlowFile record and add 
a sub-record to it with metadata. (See processor's additional details for more 
information.)");

Review Comment:
   ```suggestion
                   "Write the Kinesis Record value to the FlowFile record and 
add a sub-record to it with metadata. See additional details for more 
information.");
   ```



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