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Kafka debezium json supports automatic discovery of primary keys
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...ain/java/org/apache/paimon/flink/action/cdc/kafka/KafkaKeyValueDeserializationSchema.java
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| /* | ||
| * 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.paimon.flink.action.cdc.kafka; | ||
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| import org.apache.paimon.flink.action.cdc.format.DataFormat; | ||
| import org.apache.paimon.flink.action.cdc.format.debezium.DebeziumSchemaUtils; | ||
| import org.apache.paimon.utils.Pair; | ||
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| import org.apache.flink.api.common.typeinfo.TypeInformation; | ||
| import org.apache.flink.connector.kafka.source.reader.deserializer.KafkaRecordDeserializationSchema; | ||
| import org.apache.flink.util.Collector; | ||
| import org.apache.flink.util.Preconditions; | ||
| import org.apache.kafka.clients.consumer.ConsumerRecord; | ||
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| import java.io.IOException; | ||
| import java.nio.charset.Charset; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.util.Objects; | ||
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| /** Deserialization for kafka key and value. */ | ||
| public class KafkaKeyValueDeserializationSchema | ||
| implements KafkaRecordDeserializationSchema<String> { | ||
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| private String charset; | ||
| private String format; | ||
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| public KafkaKeyValueDeserializationSchema(String format) { | ||
| this(StandardCharsets.UTF_8.name(), format); | ||
| } | ||
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| public KafkaKeyValueDeserializationSchema(String charset, String format) { | ||
| this.charset = Preconditions.checkNotNull(charset); | ||
| this.format = format; | ||
| } | ||
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| @Override | ||
| public void deserialize(ConsumerRecord<byte[], byte[]> record, Collector<String> collector) | ||
| throws IOException { | ||
| DataFormat dataFormat = DataFormat.fromConfigString(format); | ||
| String value = new String(record.value(), Charset.forName(charset)); | ||
| switch (dataFormat) { | ||
| case DEBEZIUM_JSON: | ||
| if (Objects.isNull(record.key())) { | ||
| collector.collect(value); | ||
| } else { | ||
| String key = new String(record.key(), Charset.forName(charset)); | ||
| Pair<String, String> keyValue = Pair.of(key, value); | ||
| String result = DebeziumSchemaUtils.extractPrimaryKeys(keyValue); | ||
| collector.collect(result); | ||
| } | ||
| break; | ||
| default: | ||
| collector.collect(value); | ||
| break; | ||
| } | ||
| } | ||
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| @Override | ||
| public TypeInformation<String> getProducedType() { | ||
| return TypeInformation.of(String.class); | ||
| } | ||
| } |
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