Merge "Remove sleep from DmaapMessageConsumer"

[nonrtric.git] / policy-agent / src / main / java / org / oransc / policyagent / dmaap / DmaapMessageConsumer.java

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 e72fcf0..dd60d39 100644 (file)
--- a/policy-agent/src/main/java/org/oransc/policyagent/dmaap/DmaapMessageConsumer.java
+++ b/policy-agent/src/main/java/org/oransc/policyagent/dmaap/DmaapMessageConsumer.java
@@ -22,7 +22,6 @@ package org.oransc.policyagent.dmaap;
 
 import com.google.common.collect.Iterables;
 
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.time.Duration;
 import java.util.Properties;
@@ -34,18 +33,29 @@ 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;
 import org.springframework.beans.factory.annotation.Value;
 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.
+ *
+ * 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.
+ *
+ * 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 final static Duration TIME_BETWEEN_DMAAP_POLLS = Duration.ofSeconds(10);
+    private static final Logger logger = LoggerFactory.getLogger(DmaapMessageConsumer.class);
 
     private final ApplicationConfig applicationConfig;
 
@@ -55,24 +65,26 @@ public class DmaapMessageConsumer implements Runnable {
     @Autowired
     public DmaapMessageConsumer(ApplicationConfig applicationConfig) {
         this.applicationConfig = applicationConfig;
-
-        Thread thread = new Thread(this);
-        thread.start();
     }
 
-    DmaapMessageConsumer(ApplicationConfig applicationConfig, boolean start) {
-        this.applicationConfig = applicationConfig;
+    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) {
@@ -82,13 +94,23 @@ 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();
@@ -111,7 +133,7 @@ public class DmaapMessageConsumer implements Runnable {
     }
 
     private DmaapMessageHandler getDmaapMessageHandler() throws IOException {
-        String agentBaseUrl = "http://localhost:" + this.localServerPort;
+        String agentBaseUrl = "https://localhost:" + this.localServerPort;
         AsyncRestClient agentClient = createRestClient(agentBaseUrl);
         Properties dmaapPublisherProperties = applicationConfig.getDmaapPublisherConfig();
         MRBatchingPublisher producer = getMessageRouterPublisher(dmaapPublisherProperties);
@@ -119,30 +141,27 @@ 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 FileNotFoundException, 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 FileNotFoundException, IOException {
+    protected MRBatchingPublisher getMessageRouterPublisher(Properties dmaapPublisherProperties) throws IOException {
         return MRClientFactory.createBatchingPublisher(dmaapPublisherProperties);
     }
 }