io.confluent.kafka.formatter.json

Class JsonSchemaMessageReader

java.lang.Object

io.confluent.kafka.formatter.SchemaMessageReader<com.fasterxml.jackson.databind.JsonNode>

io.confluent.kafka.formatter.json.JsonSchemaMessageReader

All Implemented Interfaces:

kafka.common.MessageReader

public class JsonSchemaMessageReader
extends SchemaMessageReader<com.fasterxml.jackson.databind.JsonNode>
implements kafka.common.MessageReader

Example To use JsonSchemaMessageReader, first make sure that Zookeeper, Kafka and schema registry server are all started. Second, make sure the jar for JsonSchemaMessageReader and its dependencies are included in the classpath of kafka-console-producer.sh. Then run the following command.

1. Send JSON Schema string as value. (make sure there is no space in the schema string) bin/kafka-console-producer.sh --bootstrap-server localhost:9092 --topic t1 \ --line-reader io.confluent.kafka.formatter.JsonSchemaMessageReader \ --property schema.registry.url=http://localhost:8081 \ --property value.schema='{"type":"string"}'

In the shell, type in the following. "a" "b"

2. Send JSON Schema record as value. bin/kafka-console-producer.sh --bootstrap-server localhost:9092 --topic t1 \ --line-reader io.confluent.kafka.formatter.JsonSchemaMessageReader \ --property schema.registry.url=http://localhost:8081 \ --property value.schema='{"type":"object","properties":{"f1":{"type":"string"}}}'

In the shell, type in the following. {"f1": "value1"}

3. Send JSON Schema string as key and JSON Schema record as value. bin/kafka-console-producer.sh --bootstrap-server localhost:9092 --topic t1 \ --line-reader io.confluent.kafka.formatter.JsonSchemaMessageReader \ --property schema.registry.url=http://localhost:8081 \ --property parse.key=true \ --property key.schema='{"type":"string"}' \ --property value.schema='{"type":"object","properties":{"f1":{"type":"string"}}}' "type":"string"}]}'

In the shell, type in the following. "key1" \t {"f1": "value1"}

Field Summary

Fields inherited from class io.confluent.kafka.formatter.SchemaMessageReader

KEY_SCHEMA, keySchema, VALUE_SCHEMA, valueSchema

Constructor Summary

Constructors

Constructor and Description
JsonSchemaMessageReader() Constructor needed by kafka console producer.

Method Summary

Modifier and Type	Method and Description
protected SchemaMessageSerializer<com.fasterxml.jackson.databind.JsonNode>	createSerializer(org.apache.kafka.common.serialization.Serializer keySerializer)
protected SchemaProvider	getProvider()
protected com.fasterxml.jackson.databind.JsonNode	readFrom(String jsonString, ParsedSchema schema)

Methods inherited from class io.confluent.kafka.formatter.SchemaMessageReader

close, init, parseSchema, readMessage

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface kafka.common.MessageReader

$init$, close, init, readMessage

Constructor Detail

JsonSchemaMessageReader

public JsonSchemaMessageReader()

Constructor needed by kafka console producer.

Method Detail

createSerializer

protected SchemaMessageSerializer<com.fasterxml.jackson.databind.JsonNode> createSerializer(org.apache.kafka.common.serialization.Serializer keySerializer)

Specified by:

createSerializer in class SchemaMessageReader<com.fasterxml.jackson.databind.JsonNode>

getProvider

protected SchemaProvider getProvider()

Specified by:

getProvider in class SchemaMessageReader<com.fasterxml.jackson.databind.JsonNode>

readFrom

protected com.fasterxml.jackson.databind.JsonNode readFrom(String jsonString,
                                                           ParsedSchema schema)

Specified by:

readFrom in class SchemaMessageReader<com.fasterxml.jackson.databind.JsonNode>