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From tillrohrmann <...@git.apache.org>
Subject [GitHub] flink pull request #6083: [FLINK-8983] End-to-end test: Confluent schema reg...
Date Thu, 14 Jun 2018 15:56:41 GMT
Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/6083#discussion_r195469740
  
    --- Diff: flink-end-to-end-tests/flink-confluent-schema-registry/src/main/java/AvroDeserializationConfluentSchema.java
---
    @@ -0,0 +1,85 @@
    +/*
    + * 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.
    + */
    +
    +import org.apache.flink.api.common.serialization.DeserializationSchema;
    +import org.apache.flink.api.common.typeinfo.TypeInformation;
    +
    +import com.fasterxml.jackson.databind.ObjectMapper;
    +import io.confluent.kafka.schemaregistry.client.CachedSchemaRegistryClient;
    +import io.confluent.kafka.schemaregistry.client.SchemaRegistryClient;
    +import io.confluent.kafka.serializers.AbstractKafkaAvroSerDeConfig;
    +import io.confluent.kafka.serializers.KafkaAvroDecoder;
    +import org.apache.avro.generic.GenericData;
    +import tech.allegro.schema.json2avro.converter.JsonAvroConverter;
    +
    +import java.io.IOException;
    +
    +/**
    + * The deserialization schema for the Avro type.
    + */
    +public class AvroDeserializationConfluentSchema<T> implements DeserializationSchema<T>
{
    +
    +	private static final long serialVersionUID = 1L;
    +
    +	private Class<T> avroType;
    +	private final String schemaRegistryUrl;
    +	private final int identityMapCapacity;
    +	private KafkaAvroDecoder kafkaAvroDecoder;
    +
    +	private ObjectMapper mapper;
    +
    +	private JsonAvroConverter jsonAvroConverter;
    +
    +	public AvroDeserializationConfluentSchema(Class<T> avroType, String schemaRegistyUrl)
{
    +		this(avroType, schemaRegistyUrl, AbstractKafkaAvroSerDeConfig.MAX_SCHEMAS_PER_SUBJECT_DEFAULT);
    +	}
    +
    +	public AvroDeserializationConfluentSchema(Class<T> avroType, String schemaRegistryUrl,
int identityMapCapacity) {
    +		this.avroType = avroType;
    +		this.schemaRegistryUrl = schemaRegistryUrl;
    +		this.identityMapCapacity = identityMapCapacity;
    +	}
    +
    +	@Override
    +	public T deserialize(byte[] message) throws IOException {
    +		if (kafkaAvroDecoder == null) {
    +			SchemaRegistryClient schemaRegistryClient = new CachedSchemaRegistryClient(this.schemaRegistryUrl,
this.identityMapCapacity);
    +			this.kafkaAvroDecoder = new KafkaAvroDecoder(schemaRegistryClient);
    --- End diff --
    
    Why do we use the `KafkaAvroDecoder` instead of the `KafkaAvroDeserializer`?


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