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("action " + enDepAction + " on received message not handled by engine");
265 * Handle the get engine service information message.
267 * @param message the message
268 * @param webSocket the web socket that the message came on
269 * @throws ApexException on message handling exceptions
271 private void handleGetEngineServiceInfoMessage(final Message message, final WebSocket webSocket) {
272 final GetEngineServiceInfo engineServiceInformationMessage = (GetEngineServiceInfo) message;
273 LOGGER.debug("getting engine service information for engine service " + apexService.getKey().getId()
275 // Send a reply with the engine service information
276 sendServiceInfoReply(webSocket, engineServiceInformationMessage, apexService.getKey(),
277 apexService.getEngineKeys(), apexService.getApexModelKey());
278 LOGGER.debug("returned engine service information for engine service "
279 + apexService.getKey().getId());
283 * Handle the update model message.
285 * @param message the message
286 * @param webSocket the web socket that the message came on
287 * @throws ApexException on message handling exceptions
289 private void handleUpdateModelMessage(final Message message, final WebSocket webSocket) throws ApexException {
290 final UpdateModel updateModelMessage = (UpdateModel) message;
291 LOGGER.debug("updating model in engine {} . . .", updateModelMessage.getTarget().getId());
293 apexService.updateModel(updateModelMessage.getTarget(), updateModelMessage.getMessageData(),
294 updateModelMessage.isForceInstall());
295 // Send a reply indicating the message action worked
296 sendReply(webSocket, updateModelMessage, true,
297 "updated model in engine " + updateModelMessage.getTarget().getId());
298 LOGGER.debug("updated model in engine service {}", updateModelMessage.getTarget().getId());
302 * Handle the start engine message.
304 * @param message the message
305 * @param webSocket the web socket that the message came on
306 * @throws ApexException on message handling exceptions
308 private void handleStartEngineMessage(final Message message, final WebSocket webSocket) throws ApexException {
309 final StartEngine startEngineMessage = (StartEngine) message;
310 LOGGER.debug("starting engine {} . . .", startEngineMessage.getTarget().getId());
312 apexService.start(startEngineMessage.getTarget());
313 // Send a reply indicating the message action worked
314 sendReply(webSocket, startEngineMessage, true,
315 "started engine " + startEngineMessage.getTarget().getId());
316 LOGGER.debug("started engine {}", startEngineMessage.getTarget().getId());
320 * Handle the stop engine message.
322 * @param message the message
323 * @param webSocket the web socket that the message came on
324 * @throws ApexException on message handling exceptions
326 private void handleStopEngineMessage(final Message message, final WebSocket webSocket) throws ApexException {
327 final StopEngine stopEngineMessage = (StopEngine) message;
328 LOGGER.debug("stopping engine {} . . .", stopEngineMessage.getTarget().getId());
330 apexService.stop(stopEngineMessage.getTarget());
331 // Send a reply indicating the message action worked
332 sendReply(webSocket, stopEngineMessage, true,
333 "stopped engine " + stopEngineMessage.getTarget().getId());
334 LOGGER.debug("stopping engine {}", stopEngineMessage.getTarget().getId());
338 * Handle the start periodic events message.
340 * @param message the message
341 * @param webSocket the web socket that the message came on
342 * @throws ApexException on message handling exceptions
344 private void handleStartPeriodicEventsMessage(final Message message, final WebSocket webSocket)
345 throws ApexException {
346 final StartPeriodicEvents startPeriodicEventsMessage = (StartPeriodicEvents) message;
347 LOGGER.debug("starting periodic events on engine {} . . .",
348 startPeriodicEventsMessage.getTarget().getId());
349 // Start periodic events with the period specified in the message
350 final Long period = Long.parseLong(startPeriodicEventsMessage.getMessageData());
351 apexService.startPeriodicEvents(period);
352 // Send a reply indicating the message action worked
353 String periodicStartedMessage = "started periodic events on engine "
354 + startPeriodicEventsMessage.getTarget().getId() + " with period " + period;
355 sendReply(webSocket, startPeriodicEventsMessage, true, periodicStartedMessage);
356 LOGGER.debug(periodicStartedMessage);
360 * Handle the stop periodic events message.
362 * @param message the message
363 * @param webSocket the web socket that the message came on
364 * @throws ApexException on message handling exceptions
366 private void handleStopPeriodicEventsMessage(final Message message, final WebSocket webSocket)
367 throws ApexException {
368 final StopPeriodicEvents stopPeriodicEventsMessage = (StopPeriodicEvents) message;
369 LOGGER.debug("stopping periodic events on engine {} . . .",
370 stopPeriodicEventsMessage.getTarget().getId());
371 // Stop periodic events
372 apexService.stopPeriodicEvents();
373 // Send a reply indicating the message action worked
374 sendReply(webSocket, stopPeriodicEventsMessage, true, "stopped periodic events on engine "
375 + stopPeriodicEventsMessage.getTarget().getId());
376 LOGGER.debug("stopped periodic events on engine " + stopPeriodicEventsMessage.getTarget().getId());
380 * Handle the engine status message.
382 * @param message the message
383 * @param webSocket the web socket that the message came on
384 * @throws ApexException on message handling exceptions
386 private void handleEngineStatusMessage(final Message message, final WebSocket webSocket) throws ApexException {
387 final GetEngineStatus getEngineStatusMessage = (GetEngineStatus) message;
388 LOGGER.debug("getting status for engine{} . . .", getEngineStatusMessage.getTarget().getId());
389 // Send a reply with the engine status
390 sendReply(webSocket, getEngineStatusMessage, true,
391 apexService.getStatus(getEngineStatusMessage.getTarget()));
392 LOGGER.debug("returned status for engine {}", getEngineStatusMessage.getTarget().getId());
396 * Handle the engine information message.
398 * @param message the message
399 * @param webSocket the web socket that the message came on
400 * @throws ApexException on message handling exceptions
402 private void handleEngineInfoMessage(final Message message, final WebSocket webSocket) throws ApexException {
403 final GetEngineInfo getEngineInfo = (GetEngineInfo) message;
404 LOGGER.debug("getting runtime information for engine {} . . .", getEngineInfo.getTarget().getId());
405 // Send a reply with the engine runtime information
406 sendReply(webSocket, getEngineInfo, true, apexService.getRuntimeInfo(getEngineInfo.getTarget()));
407 LOGGER.debug("returned runtime information for engine {}", getEngineInfo.getTarget().getId());
411 * Send the Response message to the client.
413 * @param client the client to which to send the response message
414 * @param requestMessage the message to which we are responding
415 * @param result the result indicating success or failure
416 * @param messageData the message data
418 private void sendReply(final WebSocket client, final Message requestMessage, final boolean result,
419 final String messageData) {
420 LOGGER.entry(result, messageData);
422 if (client == null || !client.isOpen()) {
423 LOGGER.debug("error sending reply {}, client has disconnected", requestMessage.getAction());
427 String replyString = "sending " + requestMessage.getAction() + " to web socket "
428 + client.getRemoteSocketAddress().toString();
429 LOGGER.debug(replyString);
431 final Response responseMessage = new Response(requestMessage.getTarget(), result, requestMessage);
432 responseMessage.setMessageData(messageData);
434 final MessageHolder<Message> messageHolder = new MessageHolder<>(MessagingUtils.getHost());
435 messageHolder.addMessage(responseMessage);
436 client.send(MessagingUtils.serializeObject(messageHolder));
442 * Send the EngineServiceInfoResponse message to the client.
444 * @param client the client to which to send the response message
445 * @param requestMessage the message to which we are responding
446 * @param engineServiceKey The key of this engine service
447 * @param engineKeyCollection The keys of the engines in this engine service
448 * @param apexModelKey the apex model key
450 private void sendServiceInfoReply(final WebSocket client, final Message requestMessage,
451 final AxArtifactKey engineServiceKey, final Collection<AxArtifactKey> engineKeyCollection,
452 final AxArtifactKey apexModelKey) {
454 String sendingMessage = "sending " + requestMessage.getAction() + " to web socket "
455 + client.getRemoteSocketAddress().toString();
456 LOGGER.debug(sendingMessage);
458 final EngineServiceInfoResponse responseMessage = new EngineServiceInfoResponse(requestMessage.getTarget(),
459 true, requestMessage);
460 responseMessage.setMessageData("engine service information");
461 responseMessage.setEngineServiceKey(engineServiceKey);
462 responseMessage.setEngineKeyArray(engineKeyCollection);
463 responseMessage.setApexModelKey(apexModelKey);
465 final MessageHolder<Message> messageHolder = new MessageHolder<>(MessagingUtils.getHost());
466 messageHolder.addMessage(responseMessage);
467 client.send(MessagingUtils.serializeObject(messageHolder));