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authorramverma <ram.krishna.verma@ericsson.com>2018-06-08 11:56:21 +0100
committerramverma <ram.krishna.verma@ericsson.com>2018-06-08 14:07:21 +0100
commit697d02bf4e4188e3040cd987dee97d15f397a35f (patch)
tree08c9f3231c155d33827a5651e1e0263d4b8db8be /plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket
parent9289ac0afefe62f6c8e9cebddb611a8571bf5642 (diff)
Adding plugins-event module to apex-pdp
Adding plugins-event module to apex-pdp Fix a minor bug in TextFileUtils Change-Id: I393c5f5809d078850d6669d22759ba9fa1b4f0e6 Issue-ID: POLICY-862 Signed-off-by: ramverma <ram.krishna.verma@ericsson.com>
Diffstat (limited to 'plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket')
-rw-r--r--plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/pom.xml36
-rw-r--r--plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/ApexWebSocketConsumer.java195
-rw-r--r--plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/ApexWebSocketProducer.java166
-rw-r--r--plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/WEBSOCKETCarrierTechnologyParameters.java115
-rw-r--r--plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/package-info.java27
5 files changed, 539 insertions, 0 deletions
diff --git a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/pom.xml b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/pom.xml
new file mode 100644
index 000000000..f6068aa28
--- /dev/null
+++ b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/pom.xml
@@ -0,0 +1,36 @@
+<!--
+ ============LICENSE_START=======================================================
+ Copyright (C) 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=========================================================
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+ <parent>
+ <groupId>org.onap.policy.apex-pdp.plugins.plugins-event.plugins-event-carrier</groupId>
+ <artifactId>plugins-event-carrier</artifactId>
+ <version>2.0.0-SNAPSHOT</version>
+ </parent>
+
+ <artifactId>plugins-event-carrier-websocket</artifactId>
+ <name>${project.artifactId}</name>
+ <description>[${project.parent.artifactId}] Plugin for handling events being transported over web sockets</description>
+
+ <properties>
+ <apex-plugins-event-carrier-websocket-dir>${project.basedir}/src</apex-plugins-event-carrier-websocket-dir>
+ </properties>
+</project> \ No newline at end of file
diff --git a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/ApexWebSocketConsumer.java b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/ApexWebSocketConsumer.java
new file mode 100644
index 000000000..f2c59453c
--- /dev/null
+++ b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/ApexWebSocketConsumer.java
@@ -0,0 +1,195 @@
+/*-
+ * ============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.websocket;
+
+import java.util.EnumMap;
+import java.util.Map;
+
+import org.onap.policy.apex.core.infrastructure.messaging.MessagingException;
+import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WSStringMessageClient;
+import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WSStringMessageListener;
+import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WSStringMessageServer;
+import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WSStringMessager;
+import org.onap.policy.apex.core.infrastructure.threading.ApplicationThreadFactory;
+import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;
+import org.onap.policy.apex.service.engine.event.ApexEventConsumer;
+import org.onap.policy.apex.service.engine.event.ApexEventException;
+import org.onap.policy.apex.service.engine.event.ApexEventReceiver;
+import org.onap.policy.apex.service.engine.event.PeeredReference;
+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 an Apex event consumer that receives events using Kafka.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class ApexWebSocketConsumer implements ApexEventConsumer, WSStringMessageListener, Runnable {
+ private static final int WEB_SOCKET_WAIT_SLEEP_TIME = 100;
+
+ // Get a reference to the logger
+ private static final Logger LOGGER = LoggerFactory.getLogger(ApexWebSocketConsumer.class);
+
+ // The Web Socket properties
+ private WEBSOCKETCarrierTechnologyParameters webSocketConsumerProperties;
+
+ // The web socket messager, may be WS a server or a client
+ private WSStringMessager wsStringMessager;
+
+ // The event receiver that will receive events from this consumer
+ private ApexEventReceiver eventReceiver;
+
+ // The name for this consumer
+ private String name = null;
+
+ // The peer references for this event handler
+ private Map<EventHandlerPeeredMode, PeeredReference> peerReferenceMap = new EnumMap<>(EventHandlerPeeredMode.class);
+
+ // The consumer thread and stopping flag
+ private Thread consumerThread;
+ private boolean stopOrderedFlag = false;
+
+ // The number of events read to date
+ private int eventsRead = 0;
+
+ @Override
+ public void init(final String consumerName, final EventHandlerParameters consumerParameters,
+ final ApexEventReceiver incomingEventReceiver) throws ApexEventException {
+ this.eventReceiver = incomingEventReceiver;
+ this.name = consumerName;
+
+ // Check and get the Kafka Properties
+ if (!(consumerParameters.getCarrierTechnologyParameters() instanceof WEBSOCKETCarrierTechnologyParameters)) {
+ LOGGER.warn("specified consumer properties are not applicable to a web socket consumer");
+ throw new ApexEventException("specified consumer properties are not applicable to a web socket consumer");
+ }
+ webSocketConsumerProperties =
+ (WEBSOCKETCarrierTechnologyParameters) consumerParameters.getCarrierTechnologyParameters();
+
+ // Check if this is a server or a client Web Socket
+ if (webSocketConsumerProperties.isWsClient()) {
+ // Create a WS client
+ wsStringMessager = new WSStringMessageClient(webSocketConsumerProperties.getHost(),
+ webSocketConsumerProperties.getPort());
+ } else {
+ wsStringMessager = new WSStringMessageServer(webSocketConsumerProperties.getPort());
+ }
+
+ // Start reception of event strings on the web socket
+ try {
+ wsStringMessager.start(this);
+ } catch (final MessagingException e) {
+ LOGGER.warn("could not start web socket consumer");
+ }
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.onap.policy.apex.service.engine.event.ApexEventConsumer#start()
+ */
+ @Override
+ public void start() {
+ // Configure and start the event reception thread
+ final String threadName = this.getClass().getName() + ":" + this.name;
+ consumerThread = new ApplicationThreadFactory(threadName).newThread(this);
+ consumerThread.setDaemon(true);
+ consumerThread.start();
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.onap.policy.apex.service.engine.event.ApexEventConsumer#getName()
+ */
+ @Override
+ public String getName() {
+ return name;
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.onap.policy.apex.service.engine.event.ApexEventConsumer#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.ApexEventConsumer#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 java.lang.Runnable#run()
+ */
+ @Override
+ public void run() {
+ while (consumerThread.isAlive() && !stopOrderedFlag) {
+ ThreadUtilities.sleep(WEB_SOCKET_WAIT_SLEEP_TIME);
+ }
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.onap.policy.apex.apps.uservice.producer.ApexEventProducer#stop()
+ */
+ @Override
+ public void stop() {
+ if (wsStringMessager != null) {
+ wsStringMessager.stop();
+ }
+ stopOrderedFlag = true;
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see
+ * org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WSStringMessageListener#receiveString(java.
+ * lang. String)
+ */
+ @Override
+ public void receiveString(final String eventString) {
+ try {
+ eventReceiver.receiveEvent(eventString);
+ eventsRead++;
+ } catch (final Exception e) {
+ final String errorMessage = "Error sending event " + name + '_' + eventsRead + ", " + e.getMessage()
+ + ", event:\n" + eventString;
+ LOGGER.warn(errorMessage);
+ }
+ }
+}
diff --git a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/ApexWebSocketProducer.java b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/ApexWebSocketProducer.java
new file mode 100644
index 000000000..1fd146824
--- /dev/null
+++ b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/ApexWebSocketProducer.java
@@ -0,0 +1,166 @@
+/*-
+ * ============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.websocket;
+
+import java.util.EnumMap;
+import java.util.Map;
+
+import org.onap.policy.apex.core.infrastructure.messaging.MessagingException;
+import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WSStringMessageClient;
+import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WSStringMessageListener;
+import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WSStringMessageServer;
+import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WSStringMessager;
+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 a web socket.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class ApexWebSocketProducer implements ApexEventProducer, WSStringMessageListener {
+ // Get a reference to the logger
+ private static final Logger LOGGER = LoggerFactory.getLogger(ApexWebSocketProducer.class);
+
+ // The Web Socket properties
+ private WEBSOCKETCarrierTechnologyParameters webSocketProducerProperties;
+
+ // The web socket messager, may be WS a server or a client
+ private WSStringMessager wsStringMessager;
+
+ // 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 web socket Properties
+ if (!(producerParameters.getCarrierTechnologyParameters() instanceof WEBSOCKETCarrierTechnologyParameters)) {
+ LOGGER.warn(
+ "specified producer properties for " + this.name + "are not applicable to a web socket producer");
+ throw new ApexEventException("specified producer properties are not applicable to a web socket producer");
+ }
+ webSocketProducerProperties =
+ (WEBSOCKETCarrierTechnologyParameters) producerParameters.getCarrierTechnologyParameters();
+
+ // Check if this is a server or a client Web Socket
+ if (webSocketProducerProperties.isWsClient()) {
+ // Create a WS client
+ wsStringMessager = new WSStringMessageClient(webSocketProducerProperties.getHost(),
+ webSocketProducerProperties.getPort());
+ } else {
+ wsStringMessager = new WSStringMessageServer(webSocketProducerProperties.getPort());
+ }
+
+ // Start reception of event strings on the web socket
+ try {
+ wsStringMessager.start(this);
+ } catch (final MessagingException e) {
+ LOGGER.warn("could not start web socket producer (" + this.name + ")");
+ }
+ }
+
+ /*
+ * (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);
+ }
+
+ wsStringMessager.sendString((String) event);
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.onap.policy.apex.apps.uservice.producer.ApexEventProducer#stop()
+ */
+ @Override
+ public void stop() {
+ if (wsStringMessager != null) {
+ wsStringMessager.stop();
+ }
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see
+ * org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WSStringMessageListener#receiveString(java.
+ * lang. String)
+ */
+ @Override
+ public void receiveString(final String messageString) {
+ LOGGER.warn("received message \"" + messageString + "\" on web socket producer (" + this.name
+ + ") , no messages should be received on a web socket producer");
+ }
+}
diff --git a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/WEBSOCKETCarrierTechnologyParameters.java b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/WEBSOCKETCarrierTechnologyParameters.java
new file mode 100644
index 000000000..e8009a5d8
--- /dev/null
+++ b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/WEBSOCKETCarrierTechnologyParameters.java
@@ -0,0 +1,115 @@
+/*-
+ * ============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.websocket;
+
+import org.onap.policy.apex.service.parameters.carriertechnology.CarrierTechnologyParameters;
+
+/**
+ * Apex parameters for Kafka as an event carrier technology.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class WEBSOCKETCarrierTechnologyParameters extends CarrierTechnologyParameters {
+ // @formatter:off
+ private static final int MIN_USER_PORT = 1024;
+ private static final int MAX_USER_PORT = 65535;
+
+ /** The label of this carrier technology. */
+ public static final String WEB_SCOKET_CARRIER_TECHNOLOGY_LABEL = "WEBSOCKET";
+
+ /** The producer plugin class for the web socket carrier technology. */
+ public static final String WEB_SCOKET_EVENT_PRODUCER_PLUGIN_CLASS = ApexWebSocketProducer.class.getCanonicalName();
+
+ /** The consumer plugin class for the web socket carrier technology. */
+ public static final String KWEB_SCOKET_EVENT_CONSUMER_PLUGIN_CLASS = ApexWebSocketConsumer.class.getCanonicalName();
+
+ // Default parameter values
+ private static final String DEFAULT_HOST = "localhost";
+ private static final int DEFAULT_PORT = -1;
+
+ // Web socket parameters
+ private boolean wsClient = true;
+ private String host = DEFAULT_HOST;
+ private int port = DEFAULT_PORT;
+ // @formatter:on
+
+ /**
+ * Constructor to create a web socket carrier technology parameters instance and register the instance with the
+ * parameter service.
+ */
+ public WEBSOCKETCarrierTechnologyParameters() {
+ super(WEBSOCKETCarrierTechnologyParameters.class.getCanonicalName());
+
+ // Set the carrier technology properties for the web socket carrier technology
+ this.setLabel(WEB_SCOKET_CARRIER_TECHNOLOGY_LABEL);
+ this.setEventProducerPluginClass(WEB_SCOKET_EVENT_PRODUCER_PLUGIN_CLASS);
+ this.setEventConsumerPluginClass(KWEB_SCOKET_EVENT_CONSUMER_PLUGIN_CLASS);
+ }
+
+ /**
+ * Gets the host.
+ *
+ * @return the host
+ */
+ public String getHost() {
+ return host;
+ }
+
+ /**
+ * Gets the port.
+ *
+ * @return the port
+ */
+ public int getPort() {
+ return port;
+ }
+
+ /**
+ * Checks if is ws client.
+ *
+ * @return true, if checks if is ws client
+ */
+ public boolean isWsClient() {
+ return wsClient;
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.onap.policy.apex.apps.uservice.parameters.ApexParameterValidator#validate()
+ */
+ @Override
+ public String validate() {
+ final StringBuilder errorMessageBuilder = new StringBuilder();
+
+ errorMessageBuilder.append(super.validate());
+
+ if (wsClient && (host == null || host.trim().length() == 0)) {
+ errorMessageBuilder.append(" host not specified, must be host as a string\n");
+ }
+
+ if (port < MIN_USER_PORT || port > MAX_USER_PORT) {
+ errorMessageBuilder.append(" port [" + port + "] invalid, must be specified as 1024 <= port <= 6535\n");
+ }
+
+ return errorMessageBuilder.toString();
+ }
+}
diff --git a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/package-info.java b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/package-info.java
new file mode 100644
index 000000000..9555ea447
--- /dev/null
+++ b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-websocket/src/main/java/org/onap/policy/apex/plugins/event/carrier/websocket/package-info.java
@@ -0,0 +1,27 @@
+/*-
+ * ============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=========================================================
+ */
+
+/**
+ * Implements the APEX event carrier technology plugin for web sockets.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+
+package org.onap.policy.apex.plugins.event.carrier.websocket;