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KafkaRowConverterImpl.java
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KafkaRowConverterImpl.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.
*/
package org.apache.calcite.adapter.kafka;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rel.type.RelDataTypeFactory;
import org.apache.calcite.rel.type.RelDataTypeSystem;
import org.apache.calcite.sql.type.SqlTypeFactoryImpl;
import org.apache.calcite.sql.type.SqlTypeName;
import org.apache.kafka.clients.consumer.ConsumerRecord;
/**
* Default implementation of {@link KafkaRowConverter}, both key and value are byte[].
*/
public class KafkaRowConverterImpl implements KafkaRowConverter<byte[], byte[]> {
/**
* Generate row schema for a given Kafka topic.
*
* @param topicName, Kafka topic name;
* @return row type
*/
@Override public RelDataType rowDataType(final String topicName) {
final RelDataTypeFactory typeFactory =
new SqlTypeFactoryImpl(RelDataTypeSystem.DEFAULT);
final RelDataTypeFactory.Builder fieldInfo = typeFactory.builder();
fieldInfo.add("MSG_PARTITION", typeFactory.createSqlType(SqlTypeName.INTEGER)).nullable(false);
fieldInfo.add("MSG_TIMESTAMP", typeFactory.createSqlType(SqlTypeName.BIGINT)).nullable(false);
fieldInfo.add("MSG_OFFSET", typeFactory.createSqlType(SqlTypeName.BIGINT)).nullable(false);
fieldInfo.add("MSG_KEY_BYTES", typeFactory.createSqlType(SqlTypeName.VARBINARY)).nullable(true);
fieldInfo.add("MSG_VALUE_BYTES", typeFactory.createSqlType(SqlTypeName.VARBINARY))
.nullable(false);
return fieldInfo.build();
}
/**
* Parse and reformat Kafka message from consumer, to align with row schema
* defined as {@link #rowDataType(String)}.
* @param message, the raw Kafka message record;
* @return fields in the row
*/
@Override public Object[] toRow(final ConsumerRecord<byte[], byte[]> message) {
Object[] fields = new Object[5];
fields[0] = message.partition();
fields[1] = message.timestamp();
fields[2] = message.offset();
fields[3] = message.key();
fields[4] = message.value();
return fields;
}
}
// End KafkaRowConverterImpl.java