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Avro Loading Topic

Configuration Properties

Properties for an Avro Loading Topic are defined by name in the dlc.avro.topics namespace, and are picked up as configurations for the DLC.

Key	Type	Default	Description
file-pattern	`String`		Path matcher.
schema-path	`String`		Path to schema.
columns	`List<String>`	Columns will implicitly come from the store which is being published to.	Column of the file. You must specify all column names. The ones that do not correspond to a matching column in the datastore are skipped.
channels	`Set<Channel>`	A channel is created using the topic’s name as the name of the target.	Channels.
restrict-to-sources	`Set<String>`		Sources to which the topic is restricted. See source to topic matching.
restrict-from-sources	`Set<String>`		Sources from which the topic restricted. See source to topic matching.

YAML Example

This configuration does not specify a target for the data or the data format.

note

If you do not name your topic the same as your store you will have to explicitly specify the target in the channel of the topic.

The target is implicitly the Atoti table named “Trades”.
The format comes from the schema file specified in the configuration.

dlc:
  avro:
    topics:
      Trades:
        file-pattern: glob:trades*.avro
        schema-path: schemas/schema.avsc

Java Configuration

AvroTopicDescription Spring Beans are picked up as configurations for the DLC.

Parameter	Required	Type	Default	Description
name	Y	`String`		Name of the topic.
filePattern		`String`		Path matcher.
schemaPath		`String`		Path to schema.
columns		`List<String>`	Columns will implicitly come from the store which is being published to.	Column of the file. You must specify all column names. The ones that do not correspond to a matching column in the datastore are skipped.
channels		`Set<ChannelDescription>`	A channel is created using the topic’s name as the name of the target	Channel Descriptions which belong to the topic.
restrictToSources		`Set<String>`		Sources to which topic is restricted. See source to topic matching.
restrictFromSources		`Set<String>`		Sources from which topic is restricted. See source to topic matching.

Java Example

This configuration does not specify a target for the data or the data format.

note

If you do not name your topic the same as your store you will have to explicitly specify the target in the channel of the topic.

The target is implicitly the Atoti table named “Trades”.
The format comes from the schema file specified in the configuration.

@Bean
public AvroTopicDescription tradesTopic() {
    return AvroTopicDescription.builder("Trades", "glob:trades*.avro", "schemas/schema.avsc")
            .build();
}