Examples with Processor org.apache.kafka.streams.TopologyDescription.Processor used on opensource projects

Example 1 with Processor

use of org.apache.kafka.streams.TopologyDescription.Processor in project ksql by confluentinc.

the class KsLocator method findSubtopologySourceTopicSuffixes.

/**
 * For the particular state store, this finds the subtopology which contains that store, and
 * then finds the input topics for the subtopology by finding the source nodes. These topics are
 * then used for checking against all the metadata for the state store and used to find the
 * active and standby hosts for the topics. Without doing this check, incorrect assignments could
 * be chosen since different subtopologies can be run by different hosts.
 */
private Set<String> findSubtopologySourceTopicSuffixes() {
    for (final Subtopology subtopology : topology.describe().subtopologies()) {
        boolean containsStateStore = false;
        for (final TopologyDescription.Node node : subtopology.nodes()) {
            if (node instanceof Processor) {
                final Processor processor = (Processor) node;
                if (processor.stores().contains(storeName)) {
                    containsStateStore = true;
                }
            }
        }
        if (!containsStateStore) {
            continue;
        }
        for (final TopologyDescription.Node node : subtopology.nodes()) {
            if (node instanceof Source) {
                final Source source = (Source) node;
                Preconditions.checkNotNull(source.topicSet(), "Expecting topic set, not regex");
                return source.topicSet();
            }
        }
        throw new IllegalStateException("Failed to find source with topics");
    }
    throw new IllegalStateException("Failed to find state store " + storeName);
}