1 files changed, 150 insertions, 0 deletions
diff --git a/bpmn/so-bpmn-infrastructure-common/src/main/java/org/onap/so/bpmn/infrastructure/pnf/kafka/PnfEventReadyKafkaClient.java b/bpmn/so-bpmn-infrastructure-common/src/main/java/org/onap/so/bpmn/infrastructure/pnf/kafka/PnfEventReadyKafkaClient.java
new file mode 100644
index 0000000000..0d3e0e0230
--- /dev/null
+++ b/bpmn/so-bpmn-infrastructure-common/src/main/java/org/onap/so/bpmn/infrastructure/pnf/kafka/PnfEventReadyKafkaClient.java
@@ -0,0 +1,150 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Copyright (C) 2018 Nokia.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.so.bpmn.infrastructure.pnf.kafka;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import org.onap.so.client.kafka.KafkaConsumerImpl;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.core.env.Environment;
+import org.springframework.stereotype.Component;
+
+@Component
+public class PnfEventReadyKafkaClient implements KafkaClient {
+    private static final Logger logger = LoggerFactory.getLogger(PnfEventReadyKafkaClient.class);
+    private Map<String, Runnable> pnfCorrelationIdToThreadMap;
+    private int topicListenerDelayInSeconds;
+    private volatile ScheduledThreadPoolExecutor executor;
+    private volatile boolean kafkaThreadListenerIsRunning;
+    private KafkaConsumerImpl consumerForPnfReady;
+    private KafkaConsumerImpl consumerForPnfUpdate;
+    private String pnfReadyTopic;
+    private String pnfUpdateTopic;
+    private String consumerGroup;
+    private String consumerId;
+    private String consumerIdUpdate;
+
+
+
+    @Autowired
+    public PnfEventReadyKafkaClient(Environment env) throws IOException {
+        pnfCorrelationIdToThreadMap = new ConcurrentHashMap<>();
+        topicListenerDelayInSeconds = env.getProperty("pnf.kafka.topicListenerDelayInSeconds", Integer.class);
+        executor = null;
+        try {
+            consumerForPnfReady = new KafkaConsumerImpl(env.getProperty("pnf.kafka.kafkaBootstrapServers"));
+            consumerForPnfUpdate = new KafkaConsumerImpl(env.getProperty("pnf.kafka.kafkaBootstrapServers"));
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+        pnfReadyTopic = env.getProperty("pnf.kafka.pnfReadyTopicName");
+        pnfUpdateTopic = env.getProperty("pnf.kafka.pnfUpdateTopicName");
+        consumerGroup = env.getProperty("pnf.kafka.consumerGroup");
+        consumerId = env.getProperty("pnf.kafka.consumerId");
+        consumerIdUpdate = env.getProperty("pnf.kafka.consumerIdUpdate");
+    }
+
+
+    @Override
+    public synchronized void registerForUpdate(String pnfCorrelationId, Runnable informConsumer) {
+        logger.debug("registering for pnf ready kafka event for pnf correlation id: {}", pnfCorrelationId);
+        pnfCorrelationIdToThreadMap.put(pnfCorrelationId, informConsumer);
+        if (!kafkaThreadListenerIsRunning) {
+            startKafkaThreadListener();
+        }
+    }
+
+    @Override
+    public synchronized Runnable unregister(String pnfCorrelationId) {
+        logger.debug("unregistering from pnf ready kafka event for pnf correlation id: {}", pnfCorrelationId);
+        Runnable runnable = pnfCorrelationIdToThreadMap.remove(pnfCorrelationId);
+        if (pnfCorrelationIdToThreadMap.isEmpty()) {
+            consumerForPnfUpdate.close();
+            consumerForPnfReady.close();
+            stopKafkaThreadListener();
+        }
+        return runnable;
+    }
+
+    private synchronized void startKafkaThreadListener() {
+        if (!kafkaThreadListenerIsRunning) {
+            executor = new ScheduledThreadPoolExecutor(1);
+            executor.setContinueExistingPeriodicTasksAfterShutdownPolicy(false);
+            executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
+            executor.scheduleWithFixedDelay(new KafkaTopicListenerThread(), 0, topicListenerDelayInSeconds,
+                    TimeUnit.SECONDS);
+            kafkaThreadListenerIsRunning = true;
+        }
+    }
+
+    private synchronized void stopKafkaThreadListener() {
+        if (kafkaThreadListenerIsRunning) {
+            executor.shutdown();
+            kafkaThreadListenerIsRunning = false;
+            executor = null;
+        }
+    }
+
+    class KafkaTopicListenerThread implements Runnable {
+        @Override
+        public void run() {
+            try {
+                List<String> response;
+                System.out.println(pnfUpdateTopic + "   " + consumerGroup);
+                response = consumerForPnfUpdate.get(pnfUpdateTopic, consumerGroup, consumerIdUpdate);
+                if (response.isEmpty()) {
+                    response = consumerForPnfReady.get(pnfReadyTopic, consumerGroup, consumerId);
+                    getPnfCorrelationIdListFromResponse(response)
+                            .forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
+                } else {
+                    getPnfCorrelationIdListFromResponse(response)
+                            .forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
+                }
+            } catch (IOException e) {
+                logger.error("Exception caught during sending rest request to kafka for listening event topic", e);
+            }
+        }
+
+        private List<String> getPnfCorrelationIdListFromResponse(List<String> response) throws IOException {
+            if (response != null) {
+                return JsonUtilForPnfCorrelationId.parseJsonToGelAllPnfCorrelationId(response);
+            }
+            return Collections.emptyList();
+        }
+
+        private void informAboutPnfReadyIfPnfCorrelationIdFound(String pnfCorrelationId) {
+            Runnable runnable = unregister(pnfCorrelationId);
+            if (runnable != null) {
+                logger.debug("kafka listener gets pnf ready event for pnfCorrelationId: {}", pnfCorrelationId);
+                runnable.run();
+            }
+        }
+    }
+}
+