pl.allegro.tech.hermes.common.schema.SchemaCacheRefresherCallback Maven / Gradle / Ivy

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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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import pl.allegro.tech.hermes.api.ContentType;
import pl.allegro.tech.hermes.api.Topic;
import pl.allegro.tech.hermes.domain.notifications.TopicCallback;
import pl.allegro.tech.hermes.schema.CachedCompiledSchemaRepository;
import pl.allegro.tech.hermes.schema.CachedSchemaVersionsRepository;
import pl.allegro.tech.hermes.schema.CouldNotLoadSchemaException;
import pl.allegro.tech.hermes.schema.SchemaVersion;
import pl.allegro.tech.hermes.schema.SchemaVersionsResult;

import java.util.List;

class SchemaCacheRefresherCallback implements TopicCallback {

    private static final Logger logger = LoggerFactory.getLogger(SchemaVersionsRepositoryFactory.class);

    public static final boolean REFRESH_ONLINE = true;

    private final CachedSchemaVersionsRepository schemaVersionsRepository;
    private final CachedCompiledSchemaRepository compiledSchemaRepository;

    public SchemaCacheRefresherCallback(CachedSchemaVersionsRepository schemaVersionsRepository,
                                        CachedCompiledSchemaRepository compiledSchemaRepository) {
        this.schemaVersionsRepository = schemaVersionsRepository;
        this.compiledSchemaRepository = compiledSchemaRepository;
    }

    @Override
    public void onTopicRemoved(Topic topic) {
        schemaVersionsRepository.removeFromCache(topic);
        compiledSchemaRepository.removeFromCache(topic);
    }

    @Override
    public void onTopicCreated(Topic topic) {
        refreshSchemas(topic);
    }

    @Override
    public void onTopicChanged(Topic topic) {
        refreshSchemas(topic);
    }

    private void refreshSchemas(Topic topic) {
        if (topic.getContentType() == ContentType.AVRO) {
            logger.info("Refreshing all schemas for {} topic.", topic.getQualifiedName());
            SchemaVersionsResult versions = schemaVersionsRepository.versions(topic, REFRESH_ONLINE);
            if (versions.isSuccess()) {
                refreshCompiledSchemas(topic, versions.get());
            }
        }
    }

    private void refreshCompiledSchemas(Topic topic, List schemaVersions) {
        schemaVersions.forEach(schemaVersion -> {
            try {
                compiledSchemaRepository.getSchema(topic, schemaVersion, REFRESH_ONLINE);
            } catch (CouldNotLoadSchemaException e) {
                logger.warn("Schema for topic {} at version {} could not be loaded",
                        topic.getQualifiedName(), schemaVersion.value(), e);
            }
        });
    }
}