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);
116 * @see org.onap.policy.apex.core.infrastructure.messaging.MessageListener#onMessage(java.lang. String)
119 public void onMessage(final String messageString) {
120 throw new UnsupportedOperationException("String messages are not supported on the EngDep protocol");
124 * This method gets a new message listening thread from the thread factory and starts it.
126 public void startProcessorThread() {
128 messageListenerThread = new Thread(this);
129 messageListenerThread.setDaemon(true);
130 messageListenerThread.start();
135 * Stops the message listening threads.
137 public void stopProcessorThreads() {
139 stopOrderedFlag = true;
141 while (messageListenerThread.isAlive()) {
142 ThreadUtilities.sleep(LISTENER_STOP_WAIT_INTERVAL);
148 * Runs the message listening thread. Here, the messages come in on the message queue and are processed one by one
152 // Take messages off the queue and forward them to the Apex engine
153 while (messageListenerThread.isAlive() && !stopOrderedFlag) {
154 pollAndHandleMessage();
159 * Poll the queue for a message and handle that message.
161 private void pollAndHandleMessage() {
163 final MessageBlock<Message> data = messageQueue.poll(QUEUE_POLL_TIMEOUT, TimeUnit.MILLISECONDS);
165 final List<Message> messages = data.getMessages();
166 for (final Message message : messages) {
167 handleMessage(message, data.getConnection());
170 } catch (final InterruptedException e) {
171 // restore the interrupt status
172 Thread.currentThread().interrupt();
173 LOGGER.debug("message listener execution has been interrupted");
178 * This method handles EngDep messages as they come in. It uses the inevitable switch statement to handle the
181 * @param message the incoming EngDep message
182 * @param webSocket the web socket on which the message came in
184 private void handleMessage(final Message message, final WebSocket webSocket) {
185 LOGGER.entry(webSocket.getRemoteSocketAddress().toString());
186 if (message.getAction() == null) {
187 // This is a response message
192 LOGGER.debug("Manager action {} being applied to engine", message.getAction());
194 // Get and check the incoming action for validity
195 EngDepAction enDepAction = null;
196 if (message.getAction() instanceof EngDepAction) {
197 enDepAction = (EngDepAction) message.getAction();
199 throw new ApexException(message.getAction().getClass().getName()
200 + "action on received message invalid, action must be of type \"EnDepAction\"");
203 handleIncomingMessages(message, webSocket, enDepAction);
204 } catch (final ApexException e) {
205 LOGGER.warn("apex failed to execute message", e);
206 sendReply(webSocket, message, false, e.getCascadedMessage());
207 } catch (final Exception e) {
208 LOGGER.warn("system failure executing message", e);
209 sendReply(webSocket, message, false, e.getMessage());
215 * Handle incoming EngDep messages.
217 * @param message the incoming message
218 * @param webSocket the web socket the message came in on
219 * @param enDepAction the action from the message
220 * @throws ApexException on message handling errors
222 private void handleIncomingMessages(final Message message, final WebSocket webSocket, EngDepAction enDepAction)
223 throws ApexException {
224 // Handle each incoming message using the inevitable switch statement for the EngDep
226 switch (enDepAction) {
227 case GET_ENGINE_SERVICE_INFO:
228 handleGetEngineServiceInfoMessage(message, webSocket);
232 handleUpdateModelMessage(message, webSocket);
236 handleStartEngineMessage(message, webSocket);
240 handleStopEngineMessage(message, webSocket);
243 case START_PERIODIC_EVENTS:
244 handleStartPeriodicEventsMessage(message, webSocket);
247 case STOP_PERIODIC_EVENTS:
248 handleStopPeriodicEventsMessage(message, webSocket);
251 case GET_ENGINE_STATUS:
252 handleEngineStatusMessage(message, webSocket);
255 case GET_ENGINE_INFO:
256 handleEngineInfoMessage(message, webSocket);
260 throw new ApexException("RESPONSE action on received message not handled by engine");
268 * Handle the get engine service information message.
270 * @param message the message
271 * @param webSocket the web socket that the message came on
272 * @throws ApexException on message handling exceptions
274 private void handleGetEngineServiceInfoMessage(final Message message, final WebSocket webSocket) {
275 final GetEngineServiceInfo engineServiceInformationMessage = (GetEngineServiceInfo) message;
276 LOGGER.debug("getting engine service information for engine service " + apexService.getKey().getId()
278 // Send a reply with the engine service information
279 sendServiceInfoReply(webSocket, engineServiceInformationMessage, apexService.getKey(),
280 apexService.getEngineKeys(), apexService.getApexModelKey());
281 LOGGER.debug("returned engine service information for engine service "
282 + apexService.getKey().getId());
286 * Handle the update model message.
288 * @param message the message
289 * @param webSocket the web socket that the message came on
290 * @throws ApexException on message handling exceptions
292 private void handleUpdateModelMessage(final Message message, final WebSocket webSocket) throws ApexException {
293 final UpdateModel updateModelMessage = (UpdateModel) message;
294 LOGGER.debug("updating model in engine {} . . .", updateModelMessage.getTarget().getId());
296 apexService.updateModel(updateModelMessage.getTarget(), updateModelMessage.getMessageData(),
297 updateModelMessage.isForceInstall());
298 // Send a reply indicating the message action worked
299 sendReply(webSocket, updateModelMessage, true,
300 "updated model in engine " + updateModelMessage.getTarget().getId());
301 LOGGER.debug("updated model in engine service {}", updateModelMessage.getTarget().getId());
305 * Handle the start engine message.
307 * @param message the message
308 * @param webSocket the web socket that the message came on
309 * @throws ApexException on message handling exceptions
311 private void handleStartEngineMessage(final Message message, final WebSocket webSocket) throws ApexException {
312 final StartEngine startEngineMessage = (StartEngine) message;
313 LOGGER.debug("starting engine {} . . .", startEngineMessage.getTarget().getId());
315 apexService.start(startEngineMessage.getTarget());
316 // Send a reply indicating the message action worked
317 sendReply(webSocket, startEngineMessage, true,
318 "started engine " + startEngineMessage.getTarget().getId());
319 LOGGER.debug("started engine {}", startEngineMessage.getTarget().getId());
323 * Handle the stop engine message.
325 * @param message the message
326 * @param webSocket the web socket that the message came on
327 * @throws ApexException on message handling exceptions
329 private void handleStopEngineMessage(final Message message, final WebSocket webSocket) throws ApexException {
330 final StopEngine stopEngineMessage = (StopEngine) message;
331 LOGGER.debug("stopping engine {} . . .", stopEngineMessage.getTarget().getId());
333 apexService.stop(stopEngineMessage.getTarget());
334 // Send a reply indicating the message action worked
335 sendReply(webSocket, stopEngineMessage, true,
336 "stopped engine " + stopEngineMessage.getTarget().getId());
337 LOGGER.debug("stopping engine {}", stopEngineMessage.getTarget().getId());
341 * Handle the start periodic events message.
343 * @param message the message
344 * @param webSocket the web socket that the message came on
345 * @throws ApexException on message handling exceptions
347 private void handleStartPeriodicEventsMessage(final Message message, final WebSocket webSocket)
348 throws ApexException {
349 final StartPeriodicEvents startPeriodicEventsMessage = (StartPeriodicEvents) message;
350 LOGGER.debug("starting periodic events on engine {} . . .",
351 startPeriodicEventsMessage.getTarget().getId());
352 // Start periodic events with the period specified in the message
353 final Long period = Long.parseLong(startPeriodicEventsMessage.getMessageData());
354 apexService.startPeriodicEvents(period);
355 // Send a reply indicating the message action worked
356 String periodicStartedMessage = "started periodic events on engine "
357 + startPeriodicEventsMessage.getTarget().getId() + " with period " + period;
358 sendReply(webSocket, startPeriodicEventsMessage, true, periodicStartedMessage);
359 LOGGER.debug(periodicStartedMessage);
363 * Handle the stop periodic events message.
365 * @param message the message
366 * @param webSocket the web socket that the message came on
367 * @throws ApexException on message handling exceptions
369 private void handleStopPeriodicEventsMessage(final Message message, final WebSocket webSocket)
370 throws ApexException {
371 final StopPeriodicEvents stopPeriodicEventsMessage = (StopPeriodicEvents) message;
372 LOGGER.debug("stopping periodic events on engine {} . . .",
373 stopPeriodicEventsMessage.getTarget().getId());
374 // Stop periodic events
375 apexService.stopPeriodicEvents();
376 // Send a reply indicating the message action worked
377 sendReply(webSocket, stopPeriodicEventsMessage, true, "stopped periodic events on engine "
378 + stopPeriodicEventsMessage.getTarget().getId());
379 LOGGER.debug("stopped periodic events on engine " + stopPeriodicEventsMessage.getTarget().getId());
383 * Handle the engine status message.
385 * @param message the message
386 * @param webSocket the web socket that the message came on
387 * @throws ApexException on message handling exceptions
389 private void handleEngineStatusMessage(final Message message, final WebSocket webSocket) throws ApexException {
390 final GetEngineStatus getEngineStatusMessage = (GetEngineStatus) message;
391 LOGGER.debug("getting status for engine{} . . .", getEngineStatusMessage.getTarget().getId());
392 // Send a reply with the engine status
393 sendReply(webSocket, getEngineStatusMessage, true,
394 apexService.getStatus(getEngineStatusMessage.getTarget()));
395 LOGGER.debug("returned status for engine {}", getEngineStatusMessage.getTarget().getId());
399 * Handle the engine information message.
401 * @param message the message
402 * @param webSocket the web socket that the message came on
403 * @throws ApexException on message handling exceptions
405 private void handleEngineInfoMessage(final Message message, final WebSocket webSocket) throws ApexException {
406 final GetEngineInfo getEngineInfo = (GetEngineInfo) message;
407 LOGGER.debug("getting runtime information for engine {} . . .", getEngineInfo.getTarget().getId());
408 // Send a reply with the engine runtime information
409 sendReply(webSocket, getEngineInfo, true, apexService.getRuntimeInfo(getEngineInfo.getTarget()));
410 LOGGER.debug("returned runtime information for engine {}", getEngineInfo.getTarget().getId());
414 * Send the Response message to the client.
416 * @param client the client to which to send the response message
417 * @param requestMessage the message to which we are responding
418 * @param result the result indicating success or failure
419 * @param messageData the message data
421 private void sendReply(final WebSocket client, final Message requestMessage, final boolean result,
422 final String messageData) {
423 LOGGER.entry(result, messageData);
425 if (client == null || !client.isOpen()) {
426 LOGGER.debug("error sending reply {}, client has disconnected", requestMessage.getAction());
430 String replyString = "sending " + requestMessage.getAction() + " to web socket "
431 + client.getRemoteSocketAddress().toString();
432 LOGGER.debug(replyString);
434 final Response responseMessage = new Response(requestMessage.getTarget(), result, requestMessage);
435 responseMessage.setMessageData(messageData);
437 final MessageHolder<Message> messageHolder = new MessageHolder<>(MessagingUtils.getHost());
438 messageHolder.addMessage(responseMessage);
439 client.send(MessagingUtils.serializeObject(messageHolder));
445 * Send the EngineServiceInfoResponse message to the client.
447 * @param client the client to which to send the response message
448 * @param requestMessage the message to which we are responding
449 * @param engineServiceKey The key of this engine service
450 * @param engineKeyCollection The keys of the engines in this engine service
451 * @param apexModelKey the apex model key
453 private void sendServiceInfoReply(final WebSocket client, final Message requestMessage,
454 final AxArtifactKey engineServiceKey, final Collection<AxArtifactKey> engineKeyCollection,
455 final AxArtifactKey apexModelKey) {
457 String sendingMessage = "sending " + requestMessage.getAction() + " to web socket "
458 + client.getRemoteSocketAddress().toString();
459 LOGGER.debug(sendingMessage);
461 final EngineServiceInfoResponse responseMessage = new EngineServiceInfoResponse(requestMessage.getTarget(),
462 true, requestMessage);
463 responseMessage.setMessageData("engine service information");
464 responseMessage.setEngineServiceKey(engineServiceKey);
465 responseMessage.setEngineKeyArray(engineKeyCollection);
466 responseMessage.setApexModelKey(apexModelKey);
468 final MessageHolder<Message> messageHolder = new MessageHolder<>(MessagingUtils.getHost());
469 messageHolder.addMessage(responseMessage);
470 client.send(MessagingUtils.serializeObject(messageHolder));