org.apache.druid.data.input.schemarepo.Avro1124SubjectAndIdConverter Maven / Gradle / Ivy
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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.druid.data.input.schemarepo;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.apache.druid.java.util.common.Pair;
import org.schemarepo.api.converter.Converter;
import org.schemarepo.api.converter.IdentityConverter;
import org.schemarepo.api.converter.IntegerConverter;
import java.nio.ByteBuffer;
import java.util.Objects;
/**
* This implementation using injected Kafka topic name as subject name, and an integer as schema id. Before sending avro
* message to Kafka broker, you need to register the schema to an schema repository, get the schema id, serialized it to
* 4 bytes and then insert them to the head of the payload. In the reading end, you extract 4 bytes from raw messages,
* deserialize and return it with the topic name, with which you can lookup the avro schema.
*
* @see SubjectAndIdConverter
*/
public class Avro1124SubjectAndIdConverter implements SubjectAndIdConverter
{
private final String topic;
@JsonCreator
public Avro1124SubjectAndIdConverter(@JsonProperty("topic") String topic)
{
this.topic = topic;
}
@Override
public Pair getSubjectAndId(ByteBuffer payload)
{
return new Pair<>(topic, payload.getInt());
}
public void putSubjectAndId(Integer id, ByteBuffer payload)
{
payload.putInt(id);
}
@Override
public Converter getSubjectConverter()
{
return new IdentityConverter();
}
@Override
public Converter getIdConverter()
{
return new IntegerConverter();
}
@JsonProperty
public String getTopic()
{
return topic;
}
@Override
public boolean equals(Object o)
{
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Avro1124SubjectAndIdConverter converter = (Avro1124SubjectAndIdConverter) o;
return Objects.equals(topic, converter.topic);
}
@Override
public int hashCode()
{
return topic != null ? topic.hashCode() : 0;
}
}