2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.apex.plugins.event.carrier.websocket;
23 import java.util.EnumMap;
26 import org.onap.policy.apex.core.infrastructure.messaging.MessagingException;
27 import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WsStringMessageClient;
28 import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WsStringMessageListener;
29 import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WsStringMessageServer;
30 import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WsStringMessager;
31 import org.onap.policy.apex.core.infrastructure.threading.ApplicationThreadFactory;
32 import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;
33 import org.onap.policy.apex.service.engine.event.ApexEventConsumer;
34 import org.onap.policy.apex.service.engine.event.ApexEventException;
35 import org.onap.policy.apex.service.engine.event.ApexEventReceiver;
36 import org.onap.policy.apex.service.engine.event.PeeredReference;
37 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
38 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMode;
39 import org.slf4j.Logger;
40 import org.slf4j.LoggerFactory;
43 * Concrete implementation an Apex event consumer that receives events using Kafka.
45 * @author Liam Fallon (liam.fallon@ericsson.com)
47 public class ApexWebSocketConsumer implements ApexEventConsumer, WsStringMessageListener, Runnable {
48 private static final int WEB_SOCKET_WAIT_SLEEP_TIME = 100;
50 // Get a reference to the logger
51 private static final Logger LOGGER = LoggerFactory.getLogger(ApexWebSocketConsumer.class);
53 // The web socket messager, may be WS a server or a client
54 private WsStringMessager wsStringMessager;
56 // The event receiver that will receive events from this consumer
57 private ApexEventReceiver eventReceiver;
59 // The name for this consumer
60 private String name = null;
62 // The peer references for this event handler
63 private Map<EventHandlerPeeredMode, PeeredReference> peerReferenceMap = new EnumMap<>(EventHandlerPeeredMode.class);
65 // The consumer thread and stopping flag
66 private Thread consumerThread;
67 private boolean stopOrderedFlag = false;
69 // The number of events read to date
70 private int eventsRead = 0;
73 public void init(final String consumerName, final EventHandlerParameters consumerParameters,
74 final ApexEventReceiver incomingEventReceiver) throws ApexEventException {
75 this.eventReceiver = incomingEventReceiver;
76 this.name = consumerName;
78 // Check and get the Kafka Properties
79 if (!(consumerParameters.getCarrierTechnologyParameters() instanceof WebSocketCarrierTechnologyParameters)) {
80 LOGGER.warn("specified consumer properties are not applicable to a web socket consumer");
81 throw new ApexEventException("specified consumer properties are not applicable to a web socket consumer");
84 // The Web Socket properties
85 WebSocketCarrierTechnologyParameters webSocketConsumerProperties =
86 (WebSocketCarrierTechnologyParameters) consumerParameters.getCarrierTechnologyParameters();
88 // Check if this is a server or a client Web Socket
89 if (webSocketConsumerProperties.isWsClient()) {
91 wsStringMessager = new WsStringMessageClient(webSocketConsumerProperties.getHost(),
92 webSocketConsumerProperties.getPort());
94 wsStringMessager = new WsStringMessageServer(webSocketConsumerProperties.getPort());
97 // Start reception of event strings on the web socket
99 wsStringMessager.start(this);
100 } catch (final MessagingException e) {
101 LOGGER.warn("could not start web socket consumer", e);
109 public void start() {
110 // Configure and start the event reception thread
111 final String threadName = this.getClass().getName() + ":" + this.name;
112 consumerThread = new ApplicationThreadFactory(threadName).newThread(this);
113 consumerThread.setDaemon(true);
114 consumerThread.start();
121 public String getName() {
129 public PeeredReference getPeeredReference(final EventHandlerPeeredMode peeredMode) {
130 return peerReferenceMap.get(peeredMode);
137 public void setPeeredReference(final EventHandlerPeeredMode peeredMode, final PeeredReference peeredReference) {
138 peerReferenceMap.put(peeredMode, peeredReference);
146 while (consumerThread.isAlive() && !stopOrderedFlag) {
147 ThreadUtilities.sleep(WEB_SOCKET_WAIT_SLEEP_TIME);
156 if (wsStringMessager != null) {
157 wsStringMessager.stop();
159 stopOrderedFlag = true;
166 public void receiveString(final String eventString) {
168 eventReceiver.receiveEvent(null, eventString);
170 } catch (final Exception e) {
171 final String errorMessage = "Error sending event " + name + '_' + eventsRead + ", " + e.getMessage()
172 + ", event:\n" + eventString;
173 LOGGER.warn(errorMessage, e);