How to use

getLatestSchemaByTopic

method

in

com.linkedin.camus.schemaregistry.SchemaRegistry

public SchemaDetails<S> getLatestSchemaByTopic(String topicName) {
 SchemaDetails<S> schema = cachedLatest.get(topicName);
 if (schema == null) {
  schema = registry.getLatestSchemaByTopic(topicName);
  cachedLatest.putIfAbsent(topicName, schema);
 }
 return schema;
}

@Override
public void init(Properties props, String topicName) {
 super.init(props, topicName);
 try {
  SchemaRegistry<Schema> registry =
    (SchemaRegistry<Schema>) Class.forName(
      props.getProperty(KafkaAvroMessageEncoder.KAFKA_MESSAGE_CODER_SCHEMA_REGISTRY_CLASS)).newInstance();
  log.info("Prop " + KafkaAvroMessageEncoder.KAFKA_MESSAGE_CODER_SCHEMA_REGISTRY_CLASS + " is: "
       + props.getProperty(KafkaAvroMessageEncoder.KAFKA_MESSAGE_CODER_SCHEMA_REGISTRY_CLASS));
  log.info("Underlying schema registry for topic: " + topicName + " is: " + registry);
  registry.init(props);
  this.registry = new CachedSchemaRegistry<Schema>(registry, props);
  this.latestSchema = registry.getLatestSchemaByTopic(topicName).getSchema();
 } catch (Exception e) {
  throw new MessageDecoderException(e);
 }
 decoderFactory = DecoderFactory.get();
}

public void init(Properties props, String topicName) {
 super.init(props, topicName);
 this.props = props;
 this.topicName = topicName;
 
 this.schemaIDField = props.getProperty(CAMUS_SCHEMA_ID_FIELD, DEFAULT_SCHEMA_ID_FIELD);
 try {
  SchemaRegistry<Schema> registry = (SchemaRegistry<Schema>) Class.forName(
    props.getProperty(KafkaAvroMessageEncoder.KAFKA_MESSAGE_CODER_SCHEMA_REGISTRY_CLASS)).newInstance();
  log.info("Prop " + KafkaAvroMessageEncoder.KAFKA_MESSAGE_CODER_SCHEMA_REGISTRY_CLASS + " is: "
    + props.getProperty(KafkaAvroMessageEncoder.KAFKA_MESSAGE_CODER_SCHEMA_REGISTRY_CLASS));
  log.info("Underlying schema registry for topic: " + topicName + " is: " + registry);
  registry.init(props);
  
  this.registry = new CachedSchemaRegistry<Schema>(registry, props);
  this.latestSchema = ((Schema) registry.getLatestSchemaByTopic(topicName).getSchema());
 } catch (Exception e) {
  throw new MessageDecoderException(e);
 }
 
 this.decoderFactory = DecoderFactory.get();
}

 @Override
 public CamusWrapper<Record> decode(Message message) {
  try {
   GenericDatumReader<Record> reader = new GenericDatumReader<Record>();

   Schema schema = super.registry.getLatestSchemaByTopic(super.topicName).getSchema();

   reader.setSchema(schema);

   return new CamusWrapper<Record>(reader.read(null, decoderFactory.jsonDecoder(schema, new String(message.getPayload(),
   //Message.payloadOffset(message.magic()),
     kafka.message.Message.MagicOffset(), message.getPayload().length - kafka.message.Message.MagicOffset()))));
  } catch (Exception e) {
   throw new RuntimeException(e);
  }
 }
}

public SchemaDetails<S> getLatestSchemaByTopic(String topicName) {
 SchemaDetails<S> schema = cachedLatest.get(topicName);
 if (schema == null) {
  schema = registry.getLatestSchemaByTopic(topicName);
  cachedLatest.putIfAbsent(topicName, schema);
 }
 return schema;
}

@Test
public void testSchemaRegistry() {
 try {
  registry.getLatestSchemaByTopic("test");
  fail("Should have failed with a SchemaNotFoundException.");
 } catch (SchemaNotFoundException e) {
 assertEquals(new SchemaDetails("test", id, getSchema1()), registry.getLatestSchemaByTopic("test"));
 assertEquals(new SchemaDetails("test", secondId, getSchema2()), registry.getLatestSchemaByTopic("test"));
  registry.getLatestSchemaByTopic("test-2");
  fail("Should have failed with a SchemaNotFoundException.");
 } catch (SchemaNotFoundException e) {
 assertEquals(new SchemaDetails("test", secondId, getSchema2()), registry.getLatestSchemaByTopic("test"));