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.service.engine.engdep;
23 import com.google.common.eventbus.Subscribe;
25 import java.util.Collection;
26 import java.util.List;
27 import java.util.concurrent.BlockingQueue;
28 import java.util.concurrent.LinkedBlockingDeque;
29 import java.util.concurrent.TimeUnit;
31 import org.java_websocket.WebSocket;
32 import org.onap.policy.apex.core.infrastructure.messaging.MessageHolder;
33 import org.onap.policy.apex.core.infrastructure.messaging.MessageListener;
34 import org.onap.policy.apex.core.infrastructure.messaging.impl.ws.messageblock.MessageBlock;
35 import org.onap.policy.apex.core.infrastructure.messaging.util.MessagingUtils;
36 import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;
37 import org.onap.policy.apex.core.protocols.Message;
38 import org.onap.policy.apex.core.protocols.engdep.EngDepAction;
39 import org.onap.policy.apex.core.protocols.engdep.messages.EngineServiceInfoResponse;
40 import org.onap.policy.apex.core.protocols.engdep.messages.GetEngineInfo;
41 import org.onap.policy.apex.core.protocols.engdep.messages.GetEngineServiceInfo;
42 import org.onap.policy.apex.core.protocols.engdep.messages.GetEngineStatus;
43 import org.onap.policy.apex.core.protocols.engdep.messages.Response;
44 import org.onap.policy.apex.core.protocols.engdep.messages.StartEngine;
45 import org.onap.policy.apex.core.protocols.engdep.messages.StartPeriodicEvents;
46 import org.onap.policy.apex.core.protocols.engdep.messages.StopEngine;
47 import org.onap.policy.apex.core.protocols.engdep.messages.StopPeriodicEvents;
48 import org.onap.policy.apex.core.protocols.engdep.messages.UpdateModel;
49 import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
50 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
51 import org.onap.policy.apex.service.engine.runtime.EngineService;
52 import org.slf4j.ext.XLogger;
53 import org.slf4j.ext.XLoggerFactory;
56 * The listener interface for receiving engDepMessage events. The class that is interested in processing a engDepMessage
57 * event implements this interface, and the object created with that class is registered with a component using the
58 * component's <code>addEngDepMessageListener</code> method. When the engDepMessage event occurs, that object's
59 * appropriate method is invoked.
61 * <p>This class uses a queue to buffer incoming messages. When the listener is called, it places the incoming message
62 * on the queue. A thread runs which removes the messages from the queue and forwards them to the Apex engine.
64 * @author Sajeevan Achuthan (sajeevan.achuthan@ericsson.com)
66 public class EngDepMessageListener implements MessageListener<Message>, Runnable {
67 private static final int LISTENER_STOP_WAIT_INTERVAL = 10;
69 private static final XLogger LOGGER = XLoggerFactory.getXLogger(EngDepMessageListener.class);
71 // The timeout to wait between queue poll timeouts in milliseconds
72 private static final long QUEUE_POLL_TIMEOUT = 50;
74 // The Apex service itself
75 private final EngineService apexService;
77 // The message listener thread and stopping flag
78 private Thread messageListenerThread;
79 private boolean stopOrderedFlag = false;
81 // The message queue is used to hold messages prior to forwarding to Apex
82 private final BlockingQueue<MessageBlock<Message>> messageQueue = new LinkedBlockingDeque<>();
85 * Instantiates a new EngDep message listener for listening for messages coming in from the Deployment client. The
86 * <code>apexService</code> is the Apex service to send the messages onto.
88 * @param apexService the Apex engine service
90 protected EngDepMessageListener(final EngineService apexService) {
91 this.apexService = apexService;
95 * This method is an implementation of the message listener. It receives a message and places it on the queue for
96 * processing by the message listening thread.
98 * @param data the data
99 * @see org.onap.policy.apex.core.infrastructure.messaging.MessageListener#onMessage
100 * (org.onap.policy.apex.core.infrastructure.messaging.impl.ws.data.Data)
104 public void onMessage(final MessageBlock<Message> data) {
105 if (LOGGER.isDebugEnabled()) {
106 LOGGER.debug("message received from client application {} port {}",
107 data.getConnection().getRemoteSocketAddress().getAddress(),
108 data.getConnection().getRemoteSocketAddress().getPort());
110 messageQueue.add(data);
117 public void onMessage(final String messageString) {
118 throw new UnsupportedOperationException("String messages are not supported on the EngDep protocol");
122 * This method gets a new message listening thread from the thread factory and starts it.
124 public void startProcessorThread() {
126 messageListenerThread = new Thread(this);
127 messageListenerThread.setDaemon(true);
128 messageListenerThread.start();
133 * Stops the message listening threads.
135 public void stopProcessorThreads() {
137 stopOrderedFlag = true;
139 while (messageListenerThread.isAlive()) {
140 ThreadUtilities.sleep(LISTENER_STOP_WAIT_INTERVAL);
146 * Runs the message listening thread. Here, the messages come in on the message queue and are processed one by one
150 // Take messages off the queue and forward them to the Apex engine
151 while (messageListenerThread.isAlive() && !stopOrderedFlag) {
152 pollAndHandleMessage();
157 * Poll the queue for a message and handle that message.
159 private void pollAndHandleMessage() {
161 final MessageBlock<Message> data = messageQueue.poll(QUEUE_POLL_TIMEOUT, TimeUnit.MILLISECONDS);
163 final List<Message> messages = data.getMessages();
164 for (final Message message : messages) {
165 handleMessage(message, data.getConnection());
168 } catch (final InterruptedException e) {
169 // restore the interrupt status
170 Thread.currentThread().interrupt();
171 LOGGER.debug("message listener execution has been interrupted");
176 * This method handles EngDep messages as they come in. It uses the inevitable switch statement to handle the
179 * @param message the incoming EngDep message
180 * @param webSocket the web socket on which the message came in
182 private void handleMessage(final Message message, final WebSocket webSocket) {
183 LOGGER.entry(webSocket.getRemoteSocketAddress().toString());
184 if (message.getAction() == null) {
185 // This is a response message
190 LOGGER.debug("Manager action {} being applied to engine", message.getAction());
192 // Get and check the incoming action for validity
193 EngDepAction enDepAction = null;
194 if (message.getAction() instanceof EngDepAction) {
195 enDepAction = (EngDepAction) message.getAction();
197 throw new ApexException(message.getAction().getClass().getName()
198 + "action on received message invalid, action must be of type \"EnDepAction\"");
201 handleIncomingMessages(message, webSocket, enDepAction);
202 } catch (final ApexException e) {
203 LOGGER.warn("apex failed to execute message", e);
204 sendReply(webSocket, message, false, e.getCascadedMessage());
205 } catch (final Exception e) {
206 LOGGER.warn("system failure executing message", e);
207 sendReply(webSocket, message, false, e.getMessage());
213 * Handle incoming EngDep messages.
215 * @param message the incoming message
216 * @param webSocket the web socket the message came in on
217 * @param enDepAction the action from the message
218 * @throws ApexException on message handling errors
220 private void handleIncomingMessages(final Message message, final WebSocket webSocket, EngDepAction enDepAction)
221 throws ApexException {
222 // Handle each incoming message using the inevitable switch statement for the EngDep
224 switch (enDepAction) {
225 case GET_ENGINE_SERVICE_INFO:
226 handleGetEngineServiceInfoMessage(message, webSocket);
230 handleUpdateModelMessage(message, webSocket);
234 handleStartEngineMessage(message, webSocket);
238 handleStopEngineMessage(message, webSocket);
241 case START_PERIODIC_EVENTS:
242 handleStartPeriodicEventsMessage(message, webSocket);
245 case STOP_PERIODIC_EVENTS:
246 handleStopPeriodicEventsMessage(message, webSocket);
249 case GET_ENGINE_STATUS:
250 handleEngineStatusMessage(message, webSocket);
253 case GET_ENGINE_INFO:
254 handleEngineInfoMessage(message, webSocket);
258 throw new ApexException("action " + enDepAction + " on received message not handled by engine");
263 * Handle the get engine service information message.
265 * @param message the message
266 * @param webSocket the web socket that the message came on
267 * @throws ApexException on message handling exceptions
269 private void handleGetEngineServiceInfoMessage(final Message message, final WebSocket webSocket) {
270 final GetEngineServiceInfo engineServiceInformationMessage = (GetEngineServiceInfo) message;
271 LOGGER.debug("getting engine service information for engine service " + apexService.getKey().getId()
273 // Send a reply with the engine service information
274 sendServiceInfoReply(webSocket, engineServiceInformationMessage, apexService.getKey(),
275 apexService.getEngineKeys(), apexService.getApexModelKey());
276 LOGGER.debug("returned engine service information for engine service "
277 + apexService.getKey().getId());
281 * Handle the update model message.
283 * @param message the message
284 * @param webSocket the web socket that the message came on
285 * @throws ApexException on message handling exceptions
287 private void handleUpdateModelMessage(final Message message, final WebSocket webSocket) throws ApexException {
288 final UpdateModel updateModelMessage = (UpdateModel) message;
289 LOGGER.debug("updating model in engine {} . . .", updateModelMessage.getTarget().getId());
291 apexService.updateModel(updateModelMessage.getTarget(), updateModelMessage.getMessageData(),
292 updateModelMessage.isForceInstall());
293 // Send a reply indicating the message action worked
294 sendReply(webSocket, updateModelMessage, true,
295 "updated model in engine " + updateModelMessage.getTarget().getId());
296 LOGGER.debug("updated model in engine service {}", updateModelMessage.getTarget().getId());
300 * Handle the start engine message.
302 * @param message the message
303 * @param webSocket the web socket that the message came on
304 * @throws ApexException on message handling exceptions
306 private void handleStartEngineMessage(final Message message, final WebSocket webSocket) throws ApexException {
307 final StartEngine startEngineMessage = (StartEngine) message;
308 LOGGER.debug("starting engine {} . . .", startEngineMessage.getTarget().getId());
310 apexService.start(startEngineMessage.getTarget());
311 // Send a reply indicating the message action worked
312 sendReply(webSocket, startEngineMessage, true,
313 "started engine " + startEngineMessage.getTarget().getId());
314 LOGGER.debug("started engine {}", startEngineMessage.getTarget().getId());
318 * Handle the stop engine message.
320 * @param message the message
321 * @param webSocket the web socket that the message came on
322 * @throws ApexException on message handling exceptions
324 private void handleStopEngineMessage(final Message message, final WebSocket webSocket) throws ApexException {
325 final StopEngine stopEngineMessage = (StopEngine) message;
326 LOGGER.debug("stopping engine {} . . .", stopEngineMessage.getTarget().getId());
328 apexService.stop(stopEngineMessage.getTarget());
329 // Send a reply indicating the message action worked
330 sendReply(webSocket, stopEngineMessage, true,
331 "stopped engine " + stopEngineMessage.getTarget().getId());
332 LOGGER.debug("stopping engine {}", stopEngineMessage.getTarget().getId());
336 * Handle the start periodic events message.
338 * @param message the message
339 * @param webSocket the web socket that the message came on
340 * @throws ApexException on message handling exceptions
342 private void handleStartPeriodicEventsMessage(final Message message, final WebSocket webSocket)
343 throws ApexException {
344 final StartPeriodicEvents startPeriodicEventsMessage = (StartPeriodicEvents) message;
345 LOGGER.debug("starting periodic events on engine {} . . .",
346 startPeriodicEventsMessage.getTarget().getId());
347 // Start periodic events with the period specified in the message
348 final Long period = Long.parseLong(startPeriodicEventsMessage.getMessageData());
349 apexService.startPeriodicEvents(period);
350 // Send a reply indicating the message action worked
351 String periodicStartedMessage = "started periodic events on engine "
352 + startPeriodicEventsMessage.getTarget().getId() + " with period " + period;
353 sendReply(webSocket, startPeriodicEventsMessage, true, periodicStartedMessage);
354 LOGGER.debug(periodicStartedMessage);
358 * Handle the stop periodic events message.
360 * @param message the message
361 * @param webSocket the web socket that the message came on
362 * @throws ApexException on message handling exceptions
364 private void handleStopPeriodicEventsMessage(final Message message, final WebSocket webSocket)
365 throws ApexException {
366 final StopPeriodicEvents stopPeriodicEventsMessage = (StopPeriodicEvents) message;
367 LOGGER.debug("stopping periodic events on engine {} . . .",
368 stopPeriodicEventsMessage.getTarget().getId());
369 // Stop periodic events
370 apexService.stopPeriodicEvents();
371 // Send a reply indicating the message action worked
372 sendReply(webSocket, stopPeriodicEventsMessage, true, "stopped periodic events on engine "
373 + stopPeriodicEventsMessage.getTarget().getId());
374 LOGGER.debug("stopped periodic events on engine " + stopPeriodicEventsMessage.getTarget().getId());
378 * Handle the engine status message.
380 * @param message the message
381 * @param webSocket the web socket that the message came on
382 * @throws ApexException on message handling exceptions
384 private void handleEngineStatusMessage(final Message message, final WebSocket webSocket) throws ApexException {
385 final GetEngineStatus getEngineStatusMessage = (GetEngineStatus) message;
386 LOGGER.debug("getting status for engine{} . . .", getEngineStatusMessage.getTarget().getId());
387 // Send a reply with the engine status
388 sendReply(webSocket, getEngineStatusMessage, true,
389 apexService.getStatus(getEngineStatusMessage.getTarget()));
390 LOGGER.debug("returned status for engine {}", getEngineStatusMessage.getTarget().getId());
394 * Handle the engine information message.
396 * @param message the message
397 * @param webSocket the web socket that the message came on
398 * @throws ApexException on message handling exceptions
400 private void handleEngineInfoMessage(final Message message, final WebSocket webSocket) throws ApexException {
401 final GetEngineInfo getEngineInfo = (GetEngineInfo) message;
402 LOGGER.debug("getting runtime information for engine {} . . .", getEngineInfo.getTarget().getId());
403 // Send a reply with the engine runtime information
404 sendReply(webSocket, getEngineInfo, true, apexService.getRuntimeInfo(getEngineInfo.getTarget()));
405 LOGGER.debug("returned runtime information for engine {}", getEngineInfo.getTarget().getId());
409 * Send the Response message to the client.
411 * @param client the client to which to send the response message
412 * @param requestMessage the message to which we are responding
413 * @param result the result indicating success or failure
414 * @param messageData the message data
416 private void sendReply(final WebSocket client, final Message requestMessage, final boolean result,
417 final String messageData) {
418 LOGGER.entry(result, messageData);
420 if (client == null || !client.isOpen()) {
421 LOGGER.debug("error sending reply {}, client has disconnected", requestMessage.getAction());
425 String replyString = "sending " + requestMessage.getAction() + " to web socket "
426 + client.getRemoteSocketAddress().toString();
427 LOGGER.debug(replyString);
429 final Response responseMessage = new Response(requestMessage.getTarget(), result, requestMessage);
430 responseMessage.setMessageData(messageData);
432 final MessageHolder<Message> messageHolder = new MessageHolder<>(MessagingUtils.getHost());
433 messageHolder.addMessage(responseMessage);
434 client.send(MessagingUtils.serializeObject(messageHolder));
440 * Send the EngineServiceInfoResponse message to the client.
442 * @param client the client to which to send the response message
443 * @param requestMessage the message to which we are responding
444 * @param engineServiceKey The key of this engine service
445 * @param engineKeyCollection The keys of the engines in this engine service
446 * @param apexModelKey the apex model key
448 private void sendServiceInfoReply(final WebSocket client, final Message requestMessage,
449 final AxArtifactKey engineServiceKey, final Collection<AxArtifactKey> engineKeyCollection,
450 final AxArtifactKey apexModelKey) {
452 String sendingMessage = "sending " + requestMessage.getAction() + " to web socket "
453 + client.getRemoteSocketAddress().toString();
454 LOGGER.debug(sendingMessage);
456 final EngineServiceInfoResponse responseMessage = new EngineServiceInfoResponse(requestMessage.getTarget(),
457 true, requestMessage);
458 responseMessage.setMessageData("engine service information");
459 responseMessage.setEngineServiceKey(engineServiceKey);
460 responseMessage.setEngineKeyArray(engineKeyCollection);
461 responseMessage.setApexModelKey(apexModelKey);
463 final MessageHolder<Message> messageHolder = new MessageHolder<>(MessagingUtils.getHost());
464 messageHolder.addMessage(responseMessage);
465 client.send(MessagingUtils.serializeObject(messageHolder));