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Fast and reliable message broker built on top of Kafka.

There is a newer version: 2.7.0

package pl.allegro.tech.hermes.common.schema;

import com.fasterxml.jackson.databind.ObjectMapper;
import pl.allegro.tech.hermes.common.metric.MetricsFacade;
import pl.allegro.tech.hermes.schema.RawSchemaClient;
import pl.allegro.tech.hermes.schema.SubjectNamingStrategy;
import pl.allegro.tech.hermes.schema.confluent.SchemaRegistryRawSchemaClient;
import pl.allegro.tech.hermes.schema.resolver.SchemaRepositoryInstanceResolver;

public class RawSchemaClientFactory {

    private final String kafkaNamespace;
    private final String kafkaNamespaceSeparator;
    private final MetricsFacade metricsFacade;
    private final ObjectMapper objectMapper;
    private final SchemaRepositoryInstanceResolver resolver;
    private final boolean subjectSuffixEnabled;
    private final boolean subjectNamespaceEnabled;

    public RawSchemaClientFactory(String kafkaNamespace,
                                  String kafkaNamespaceSeparator,
                                  MetricsFacade metricsFacade,
                                  ObjectMapper objectMapper,
                                  SchemaRepositoryInstanceResolver resolver,
                                  boolean subjectSuffixEnabled,
                                  boolean subjectNamespaceEnabled) {
        this.kafkaNamespace = kafkaNamespace;
        this.kafkaNamespaceSeparator = kafkaNamespaceSeparator;
        this.metricsFacade = metricsFacade;
        this.objectMapper = objectMapper;
        this.resolver = resolver;
        this.subjectSuffixEnabled = subjectSuffixEnabled;
        this.subjectNamespaceEnabled = subjectNamespaceEnabled;
    }

    public RawSchemaClient provide() {
        SubjectNamingStrategy subjectNamingStrategy = SubjectNamingStrategy.qualifiedName
                .withValueSuffixIf(subjectSuffixEnabled)
                .withNamespacePrefixIf(
                        subjectNamespaceEnabled,
                        new SubjectNamingStrategy.Namespace(
                                kafkaNamespace,
                                kafkaNamespaceSeparator
                        )
                );
        return createMetricsTrackingClient(
                new SchemaRegistryRawSchemaClient(resolver, objectMapper, subjectNamingStrategy)
        );
    }

    private RawSchemaClient createMetricsTrackingClient(RawSchemaClient rawSchemaClient) {
        return new ReadMetricsTrackingRawSchemaClient(rawSchemaClient, metricsFacade);
    }
}