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ItemProcessingAgent.java
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/
ItemProcessingAgent.java
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package ibm.gse.eda.stores.infra.events;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Logger;
import org.apache.kafka.streams.KafkaStreams;
import org.eclipse.microprofile.health.Startup;
import ibm.gse.eda.stores.domain.StoreInventoryAggregator;
import jakarta.enterprise.context.ApplicationScoped;
import jakarta.enterprise.context.BeforeDestroyed;
import jakarta.enterprise.context.Initialized;
import jakarta.enterprise.event.Observes;
import jakarta.inject.Inject;
import jakarta.inject.Singleton;
import jakarta.ws.rs.Produces;
/**
* The agent is here to do the execution of the aggregator
*/
@ApplicationScoped
public class ItemProcessingAgent {
private static final Logger logger = Logger.getLogger(ItemProcessingAgent.class.getName());
private static volatile boolean shutdown = false;
private final ExecutorService executorService;
private KafkaStreams kafkaStreams;
@Inject
private KafkaConfig kafkaConfig;
@Inject
private StoreInventoryAggregator aggregator;
public ItemProcessingAgent() {
this.executorService = Executors.newSingleThreadExecutor();
}
public synchronized void stop() {
}
void onStart(@Observes @Initialized(ApplicationScoped.class)Object context){
this.kafkaStreams = initializeKafkaStreams();
logger.info("ItemProcessingAgent started");
}
void onStop(@Observes @BeforeDestroyed(ApplicationScoped.class) Object ev){
shutdown = true;
if (executorService != null) {
executorService.shutdown();
}
if ( kafkaStreams != null ) {
kafkaStreams.close();
}
}
@Produces
@Singleton
@Startup
public KafkaStreams getKafkaStreams() {
return kafkaStreams;
}
private KafkaStreams initializeKafkaStreams() {
Properties props = kafkaConfig.getKafkaProperties();
kafkaStreams = new KafkaStreams(aggregator.buildProcessFlow(), props);
executorService.execute(new Runnable() {
@Override
public void run() {
if (!shutdown) {
logger.info("Starting Kafka Streams pipeline");
kafkaStreams.start();
}
}
});
return kafkaStreams;
}
}