X-Git-Url: https://gerrit.o-ran-sc.org/r/gitweb?a=blobdiff_plain;f=policy-agent%2Fsrc%2Fmain%2Fjava%2Forg%2Foransc%2Fpolicyagent%2Fdmaap%2FDmaapMessageConsumer.java;h=6312e375aaccc7bd55a4c1f9c6f0cccb1fd57a4f;hb=0b10c7fa768f05ae5146ce2f3a69998bb8f97a9f;hp=da209a8609888f4c1d07d1aed58e686c1dd24acb;hpb=d0f9e47adecf3e51f168383e4568471f605ec6d3;p=nonrtric.git

diff --git a/policy-agent/src/main/java/org/oransc/policyagent/dmaap/DmaapMessageConsumer.java b/policy-agent/src/main/java/org/oransc/policyagent/dmaap/DmaapMessageConsumer.java
index da209a86..6312e375 100644
--- a/policy-agent/src/main/java/org/oransc/policyagent/dmaap/DmaapMessageConsumer.java
+++ b/policy-agent/src/main/java/org/oransc/policyagent/dmaap/DmaapMessageConsumer.java
@@ -33,6 +33,7 @@ import org.onap.dmaap.mr.client.response.MRConsumerResponse;
 import org.oransc.policyagent.clients.AsyncRestClient;
 import org.oransc.policyagent.configuration.ApplicationConfig;
 import org.oransc.policyagent.exceptions.ServiceException;
+import org.oransc.policyagent.tasks.RefreshConfigTask;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -40,15 +41,23 @@ import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Component;
 
 /**
- * The class fetches incoming requests from DMAAP on regular intervals. Each
- * received request is proceesed by DmaapMessageHandler.
+ * 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.
+ *
+ * <p>
+ * 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>
+ * Each received request is processed by {@link DmaapMessageHandler}.
  */
 @Component
-public class DmaapMessageConsumer implements Runnable {
+public class DmaapMessageConsumer {
 
-    private static final Logger logger = LoggerFactory.getLogger(DmaapMessageConsumer.class);
+    protected static final Duration TIME_BETWEEN_DMAAP_RETRIES = Duration.ofSeconds(10);
 
-    private static final Duration TIME_BETWEEN_DMAAP_POLLS = Duration.ofSeconds(10);
+    private static final Logger logger = LoggerFactory.getLogger(DmaapMessageConsumer.class);
 
     private final ApplicationConfig applicationConfig;
 
@@ -58,20 +67,32 @@ public class DmaapMessageConsumer implements Runnable {
     @Autowired
     public DmaapMessageConsumer(ApplicationConfig applicationConfig) {
         this.applicationConfig = applicationConfig;
+    }
 
-        Thread thread = new Thread(this);
+    /**
+     * 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.start();
+        return thread;
     }
 
-    private boolean isDmaapConfigured() {
-        Properties consumerCfg = applicationConfig.getDmaapConsumerConfig();
-        Properties producerCfg = applicationConfig.getDmaapPublisherConfig();
-        return (consumerCfg != null && consumerCfg.size() > 0 && producerCfg != null && producerCfg.size() > 0);
+    private void checkConfigLoop() {
+        while (!isStopped()) {
+            if (isDmaapConfigured()) {
+                messageHandlingLoop();
+            } else {
+                sleep(RefreshConfigTask.CONFIG_REFRESH_INTERVAL);
+            }
+        }
     }
 
-    @Override
-    public void run() {
-        while (sleep(TIME_BETWEEN_DMAAP_POLLS) && isDmaapConfigured()) {
+    private void messageHandlingLoop() {
+        while (!isStopped() && isDmaapConfigured()) {
             try {
                 Iterable<String> dmaapMsgs = fetchAllMessages();
                 if (dmaapMsgs != null && Iterables.size(dmaapMsgs) > 0) {
@@ -81,13 +102,23 @@ public class DmaapMessageConsumer implements Runnable {
                     }
                 }
             } catch (Exception e) {
-                logger.warn("{}: cannot fetch because of {}", this, e.getMessage());
-                sleep(TIME_BETWEEN_DMAAP_POLLS);
+                logger.warn("Cannot fetch because of {}", e.getMessage());
+                sleep(TIME_BETWEEN_DMAAP_RETRIES);
             }
         }
     }
 
-    private Iterable<String> fetchAllMessages() throws ServiceException, IOException {
+    protected boolean isStopped() {
+        return false;
+    }
+
+    protected boolean isDmaapConfigured() {
+        Properties consumerCfg = applicationConfig.getDmaapConsumerConfig();
+        Properties producerCfg = applicationConfig.getDmaapPublisherConfig();
+        return (consumerCfg != null && consumerCfg.size() > 0 && producerCfg != null && producerCfg.size() > 0);
+    }
+
+    protected Iterable<String> fetchAllMessages() throws ServiceException, IOException {
         Properties dmaapConsumerProperties = this.applicationConfig.getDmaapConsumerConfig();
         MRConsumer consumer = getMessageRouterConsumer(dmaapConsumerProperties);
         MRConsumerResponse response = consumer.fetchWithReturnConsumerResponse();
@@ -118,29 +149,27 @@ public class DmaapMessageConsumer implements Runnable {
         return createDmaapMessageHandler(agentClient, producer);
     }
 
-    boolean sleep(Duration duration) {
+    protected void sleep(Duration duration) {
         try {
             Thread.sleep(duration.toMillis());
-            return true;
         } catch (Exception e) {
             logger.error("Failed to put the thread to sleep", e);
-            return false;
         }
     }
 
-    MRConsumer getMessageRouterConsumer(Properties dmaapConsumerProperties) throws IOException {
+    protected MRConsumer getMessageRouterConsumer(Properties dmaapConsumerProperties) throws IOException {
         return MRClientFactory.createConsumer(dmaapConsumerProperties);
     }
 
-    DmaapMessageHandler createDmaapMessageHandler(AsyncRestClient agentClient, MRBatchingPublisher producer) {
+    protected DmaapMessageHandler createDmaapMessageHandler(AsyncRestClient agentClient, MRBatchingPublisher producer) {
         return new DmaapMessageHandler(producer, agentClient);
     }
 
-    AsyncRestClient createRestClient(String agentBaseUrl) {
+    protected AsyncRestClient createRestClient(String agentBaseUrl) {
         return new AsyncRestClient(agentBaseUrl);
     }
 
-    MRBatchingPublisher getMessageRouterPublisher(Properties dmaapPublisherProperties) throws IOException {
+    protected MRBatchingPublisher getMessageRouterPublisher(Properties dmaapPublisherProperties) throws IOException {
         return MRClientFactory.createBatchingPublisher(dmaapPublisherProperties);
     }
 }