flink-connectors/flink-connector-kafka-base/src/test/java/org/apache/flink/streaming/connectors/kafka/JSONKeyValueDeserializationSchemaTest.java

/*
 * 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.
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package org.apache.flink.streaming.connectors.kafka;

import org.apache.flink.streaming.util.serialization.JSONKeyValueDeserializationSchema;

import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode;

import org.junit.Assert;
import org.junit.Test;

import java.io.IOException;

/**
 * Tests for the{@link JSONKeyValueDeserializationSchema}.
 */
public class JSONKeyValueDeserializationSchemaTest {
	@Test
	public void testDeserializeWithoutMetadata() throws IOException {
		ObjectMapper mapper = new ObjectMapper();
		ObjectNode initialKey = mapper.createObjectNode();
		initialKey.put("index", 4);
		byte[] serializedKey = mapper.writeValueAsBytes(initialKey);

		ObjectNode initialValue = mapper.createObjectNode();
		initialValue.put("word", "world");
		byte[] serializedValue = mapper.writeValueAsBytes(initialValue);

		JSONKeyValueDeserializationSchema schema = new JSONKeyValueDeserializationSchema(false);
		ObjectNode deserializedValue = schema.deserialize(serializedKey, serializedValue, "", 0, 0);

		Assert.assertTrue(deserializedValue.get("metadata") == null);
		Assert.assertEquals(4, deserializedValue.get("key").get("index").asInt());
		Assert.assertEquals("world", deserializedValue.get("value").get("word").asText());
	}

	@Test
	public void testDeserializeWithoutKey() throws IOException {
		ObjectMapper mapper = new ObjectMapper();
		byte[] serializedKey = null;

		ObjectNode initialValue = mapper.createObjectNode();
		initialValue.put("word", "world");
		byte[] serializedValue = mapper.writeValueAsBytes(initialValue);

		JSONKeyValueDeserializationSchema schema = new JSONKeyValueDeserializationSchema(false);
		ObjectNode deserializedValue = schema.deserialize(serializedKey, serializedValue, "", 0, 0);

		Assert.assertTrue(deserializedValue.get("metadata") == null);
		Assert.assertTrue(deserializedValue.get("key") == null);
		Assert.assertEquals("world", deserializedValue.get("value").get("word").asText());
	}

	@Test
	public void testDeserializeWithoutValue() throws IOException {
		ObjectMapper mapper = new ObjectMapper();
		ObjectNode initialKey = mapper.createObjectNode();
		initialKey.put("index", 4);
		byte[] serializedKey = mapper.writeValueAsBytes(initialKey);

		byte[] serializedValue = null;

		JSONKeyValueDeserializationSchema schema = new JSONKeyValueDeserializationSchema(false);
		ObjectNode deserializedValue = schema.deserialize(serializedKey, serializedValue, "", 0, 0);

		Assert.assertTrue(deserializedValue.get("metadata") == null);
		Assert.assertEquals(4, deserializedValue.get("key").get("index").asInt());
		Assert.assertTrue(deserializedValue.get("value") == null);
	}

	@Test
	public void testDeserializeWithMetadata() throws IOException {
		ObjectMapper mapper = new ObjectMapper();
		ObjectNode initialKey = mapper.createObjectNode();
		initialKey.put("index", 4);
		byte[] serializedKey = mapper.writeValueAsBytes(initialKey);

		ObjectNode initialValue = mapper.createObjectNode();
		initialValue.put("word", "world");
		byte[] serializedValue = mapper.writeValueAsBytes(initialValue);

		JSONKeyValueDeserializationSchema schema = new JSONKeyValueDeserializationSchema(true);
		ObjectNode deserializedValue = schema.deserialize(serializedKey, serializedValue, "topic#1", 3, 4);

		Assert.assertEquals(4, deserializedValue.get("key").get("index").asInt());
		Assert.assertEquals("world", deserializedValue.get("value").get("word").asText());
		Assert.assertEquals("topic#1", deserializedValue.get("metadata").get("topic").asText());
		Assert.assertEquals(4, deserializedValue.get("metadata").get("offset").asInt());
		Assert.assertEquals(3, deserializedValue.get("metadata").get("partition").asInt());
	}
}