[GitHub] [camel-kafka-connector] valdar commented on a change in pull request #686: Added PojoToSchemaAndStructTransform to infer POJO kafka connec schem…

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valdar commented on a change in pull request #686:
URL: https://github.com/apache/camel-kafka-connector/pull/686#discussion_r519902255



##########
File path: core/src/main/java/org/apache/camel/kafkaconnector/transforms/PojoToSchemaAndStructTransform.java
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@@ -0,0 +1,96 @@
+/*
+ * 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.camel.kafkaconnector.transforms;
+
+import java.io.IOException;
+import java.util.Map;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonMappingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.avro.AvroFactory;
+import com.fasterxml.jackson.dataformat.avro.AvroSchema;
+import com.fasterxml.jackson.dataformat.avro.schema.AvroSchemaGenerator;
+import io.apicurio.registry.utils.converter.avro.AvroData;
+import org.apache.avro.generic.GenericDatumReader;
+import org.apache.avro.generic.GenericRecord;
+import org.apache.avro.io.DatumReader;
+import org.apache.avro.io.Decoder;
+import org.apache.avro.io.DecoderFactory;
+import org.apache.kafka.common.config.ConfigDef;
+import org.apache.kafka.connect.connector.ConnectRecord;
+import org.apache.kafka.connect.data.SchemaAndValue;
+import org.apache.kafka.connect.transforms.Transformation;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class PojoToSchemaAndStructTransform <R extends ConnectRecord<R>> implements Transformation<R> {
+    private static final Logger LOG = LoggerFactory.getLogger(PojoToSchemaAndStructTransform.class);
+
+    @Override
+    public R apply(R r) {
+        LOG.debug("Incoming record: " + r);
+
+        ObjectMapper mapper = new ObjectMapper(new AvroFactory());
+        AvroSchemaGenerator gen = new AvroSchemaGenerator();
+
+        try {
+            mapper.acceptJsonFormatVisitor(r.value().getClass(), gen);
+        } catch (JsonMappingException e) {
+            e.printStackTrace();
+        }
+
+        AvroSchema schemaWrapper = gen.getGeneratedSchema();
+        org.apache.avro.Schema avroSchema = schemaWrapper.getAvroSchema();
+        LOG.debug("Generated avro schema: " + avroSchema.toString(true));
+
+        SchemaAndValue connectSchemaAndData = null;
+        try {
+            byte[] avroDataByte = mapper.writer(schemaWrapper).writeValueAsBytes(r.value());
+            Decoder decoder = DecoderFactory.get().binaryDecoder(avroDataByte, null);
+            DatumReader<GenericRecord> datumReader = new GenericDatumReader<GenericRecord>(avroSchema);
+            GenericRecord genericAvroData = datumReader.read(null, decoder);
+
+            AvroData ad = new AvroData(1000);
+            connectSchemaAndData = ad.toConnectData(avroSchema, genericAvroData);

Review comment:
       Probably in the context of using it for one connector, not sure how is it handled for multiple connectors... in theory the class should be loaded once per connector classpath...




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