1 files changed, 151 insertions, 0 deletions
diff --git a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/src/main/java/org/onap/policy/apex/plugins/event/carrier/kafka/ApexKafkaProducer.java b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/src/main/java/org/onap/policy/apex/plugins/event/carrier/kafka/ApexKafkaProducer.java
new file mode 100644
index 000000000..fb851bc70
--- /dev/null
+++ b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/src/main/java/org/onap/policy/apex/plugins/event/carrier/kafka/ApexKafkaProducer.java
@@ -0,0 +1,151 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.plugins.event.carrier.kafka;
+
+import java.util.EnumMap;
+import java.util.Map;
+
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.clients.producer.Producer;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.onap.policy.apex.service.engine.event.ApexEventException;
+import org.onap.policy.apex.service.engine.event.ApexEventProducer;
+import org.onap.policy.apex.service.engine.event.PeeredReference;
+import org.onap.policy.apex.service.engine.event.SynchronousEventCache;
+import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
+import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMode;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Concrete implementation of an Apex event producer that sends events using Kafka.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class ApexKafkaProducer implements ApexEventProducer {
+
+    // Get a reference to the logger
+    private static final Logger LOGGER = LoggerFactory.getLogger(ApexKafkaProducer.class);
+
+    // The Kafka parameters read from the parameter service
+    private KAFKACarrierTechnologyParameters kafkaProducerProperties;
+
+    // The Kafka Producer used to send events using Kafka
+    private Producer<String, Object> kafkaProducer;
+
+    // The name for this producer
+    private String name = null;
+
+    // The peer references for this event handler
+    private Map<EventHandlerPeeredMode, PeeredReference> peerReferenceMap = new EnumMap<>(EventHandlerPeeredMode.class);
+
+    @Override
+    public void init(final String producerName, final EventHandlerParameters producerParameters)
+            throws ApexEventException {
+        this.name = producerName;
+
+        // Check and get the Kafka Properties
+        if (!(producerParameters.getCarrierTechnologyParameters() instanceof KAFKACarrierTechnologyParameters)) {
+            LOGGER.warn("specified producer properties are not applicable to a Kafka producer (" + this.name + ")");
+            throw new ApexEventException(
+                    "specified producer properties are not applicable to a Kafka producer (" + this.name + ")");
+        }
+        kafkaProducerProperties =
+                (KAFKACarrierTechnologyParameters) producerParameters.getCarrierTechnologyParameters();
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.service.engine.event.ApexEventProducer#getName()
+     */
+    @Override
+    public String getName() {
+        return name;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.service.engine.event.ApexEventProducer#getPeeredReference(org.onap.policy.apex.service.
+     * parameters.eventhandler.EventHandlerPeeredMode)
+     */
+    @Override
+    public PeeredReference getPeeredReference(final EventHandlerPeeredMode peeredMode) {
+        return peerReferenceMap.get(peeredMode);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.service.engine.event.ApexEventProducer#setPeeredReference(org.onap.policy.apex.service.
+     * parameters.eventhandler.EventHandlerPeeredMode, org.onap.policy.apex.service.engine.event.PeeredReference)
+     */
+    @Override
+    public void setPeeredReference(final EventHandlerPeeredMode peeredMode, final PeeredReference peeredReference) {
+        peerReferenceMap.put(peeredMode, peeredReference);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.apps.uservice.producer.ApexEventProducer#sendEvent(long, java.lang.String,
+     * java.lang.Object)
+     */
+    @Override
+    public void sendEvent(final long executionId, final String eventName, final Object event) {
+        // Check if this is a synchronized event, if so we have received a reply
+        final SynchronousEventCache synchronousEventCache =
+                (SynchronousEventCache) peerReferenceMap.get(EventHandlerPeeredMode.SYNCHRONOUS);
+        if (synchronousEventCache != null) {
+            synchronousEventCache.removeCachedEventToApexIfExists(executionId);
+        }
+
+        // Kafka producer must be started in the same thread as it is stopped, so we must start it here
+        if (kafkaProducer == null) {
+            // Kick off the Kafka producer
+            kafkaProducer = new KafkaProducer<String, Object>(kafkaProducerProperties.getKafkaProducerProperties());
+            if (LOGGER.isDebugEnabled()) {
+                LOGGER.debug("event producer " + this.name + " is ready to send to topics: "
+                        + kafkaProducerProperties.getProducerTopic());
+            }
+        }
+
+        kafkaProducer.send(new ProducerRecord<String, Object>(kafkaProducerProperties.getProducerTopic(), name, event));
+        if (LOGGER.isTraceEnabled()) {
+            LOGGER.trace("event sent from engine using {} to topic {} : {} ", this.name,
+                    kafkaProducerProperties.getProducerTopic(), event);
+        }
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.apps.uservice.producer.ApexEventProducer#stop()
+     */
+    @Override
+    public void stop() {
+        if (kafkaProducer != null) {
+            kafkaProducer.flush();
+            kafkaProducer.close();
+        }
+    }
+}