import org.springframework.stereotype.Component;
/**
- * The class fetches incoming requests from DMAAP. It uses the timeout parameter that lets the MessageRouter keep the
- * connection with the Kafka open until requests are sent in.
+ * The class fetches incoming requests from DMAAP. It uses the timeout parameter
+ * that lets the MessageRouter keep the connection with the Kafka open until
+ * requests are sent in.
*
- * If there is no DMaaP configuration in the application configuration, then this service will regularly check the
- * configuration and start polling DMaaP if the configuration is added. If the DMaaP configuration is removed, then the
- * service will stop polling and resume checking for configuration.
+ * <p>
+ * this service will regularly check the configuration and start polling DMaaP
+ * if the configuration is added. If the DMaaP configuration is removed, then
+ * the service will stop polling and resume checking for configuration.
*
+ * <p>
* Each received request is processed by {@link DmaapMessageHandler}.
*/
@Component
private final ApplicationConfig applicationConfig;
+ private DmaapMessageHandler dmaapMessageHandler = null;
+ private MRConsumer messageRouterConsumer = null;
+
@Value("${server.port}")
private int localServerPort;
this.applicationConfig = applicationConfig;
}
+ /**
+ * Starts the consumer. If there is a DMaaP configuration, it will start polling for messages. Otherwise it will
+ * check regularly for the configuration.
+ *
+ * @return the running thread, for test purposes.
+ */
public Thread start() {
- Thread thread = new Thread(() -> this.checkConfigLoop());
+ Thread thread = new Thread(this::checkConfigLoop);
thread.start();
return thread;
}
getDmaapMessageHandler().handleDmaapMsg(msg);
}
- private DmaapMessageHandler getDmaapMessageHandler() throws IOException {
- String agentBaseUrl = "https://localhost:" + this.localServerPort;
- AsyncRestClient agentClient = createRestClient(agentBaseUrl);
- Properties dmaapPublisherProperties = applicationConfig.getDmaapPublisherConfig();
- MRBatchingPublisher producer = getMessageRouterPublisher(dmaapPublisherProperties);
-
- return createDmaapMessageHandler(agentClient, producer);
+ protected DmaapMessageHandler getDmaapMessageHandler() throws IOException {
+ if (this.dmaapMessageHandler == null) {
+ String agentBaseUrl = "https://localhost:" + this.localServerPort;
+ AsyncRestClient agentClient = new AsyncRestClient(agentBaseUrl);
+ Properties dmaapPublisherProperties = applicationConfig.getDmaapPublisherConfig();
+ MRBatchingPublisher producer = MRClientFactory.createBatchingPublisher(dmaapPublisherProperties);
+ this.dmaapMessageHandler = new DmaapMessageHandler(producer, agentClient);
+ }
+ return this.dmaapMessageHandler;
}
protected void sleep(Duration duration) {
}
protected MRConsumer getMessageRouterConsumer(Properties dmaapConsumerProperties) throws IOException {
- return MRClientFactory.createConsumer(dmaapConsumerProperties);
- }
-
- protected DmaapMessageHandler createDmaapMessageHandler(AsyncRestClient agentClient, MRBatchingPublisher producer) {
- return new DmaapMessageHandler(producer, agentClient);
- }
-
- protected AsyncRestClient createRestClient(String agentBaseUrl) {
- return new AsyncRestClient(agentBaseUrl);
+ if (this.messageRouterConsumer == null) {
+ this.messageRouterConsumer = MRClientFactory.createConsumer(dmaapConsumerProperties);
+ }
+ return this.messageRouterConsumer;
}
- protected MRBatchingPublisher getMessageRouterPublisher(Properties dmaapPublisherProperties) throws IOException {
- return MRClientFactory.createBatchingPublisher(dmaapPublisherProperties);
- }
}