main/src/main/java/org/onap/policy/pap/main/startstop/PapActivator.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  *  Copyright (C) 2019 Nordix Foundation.
   4  *  Modifications Copyright (C) 2019 AT&T Intellectual Property.
   5  * ================================================================================
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *      http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  * SPDX-License-Identifier: Apache-2.0
  19  * ============LICENSE_END=========================================================
  20  */
  21
  22 package org.onap.policy.pap.main.startstop;
  23
  24 import java.util.Arrays;
  25 import java.util.concurrent.atomic.AtomicReference;
  26 import org.onap.policy.common.endpoints.event.comm.TopicEndpointManager;
  27 import org.onap.policy.common.endpoints.event.comm.TopicSource;
  28 import org.onap.policy.common.endpoints.http.server.RestServer;
  29 import org.onap.policy.common.endpoints.listeners.MessageTypeDispatcher;
  30 import org.onap.policy.common.endpoints.listeners.RequestIdDispatcher;
  31 import org.onap.policy.common.parameters.ParameterService;
  32 import org.onap.policy.common.utils.services.Registry;
  33 import org.onap.policy.common.utils.services.ServiceManagerContainer;
  34 import org.onap.policy.models.pap.concepts.PolicyNotification;
  35 import org.onap.policy.models.pdp.concepts.PdpMessage;
  36 import org.onap.policy.models.pdp.concepts.PdpStatus;
  37 import org.onap.policy.models.pdp.enums.PdpMessageType;
  38 import org.onap.policy.pap.main.PapConstants;
  39 import org.onap.policy.pap.main.PolicyModelsProviderFactoryWrapper;
  40 import org.onap.policy.pap.main.PolicyPapRuntimeException;
  41 import org.onap.policy.pap.main.comm.PdpHeartbeatListener;
  42 import org.onap.policy.pap.main.comm.PdpModifyRequestMap;
  43 import org.onap.policy.pap.main.comm.PdpTracker;
  44 import org.onap.policy.pap.main.comm.Publisher;
  45 import org.onap.policy.pap.main.comm.TimerManager;
  46 import org.onap.policy.pap.main.notification.PolicyNotifier;
  47 import org.onap.policy.pap.main.parameters.PapParameterGroup;
  48 import org.onap.policy.pap.main.parameters.PdpModifyRequestMapParams;
  49 import org.onap.policy.pap.main.parameters.PdpParameters;
  50 import org.onap.policy.pap.main.rest.HealthCheckRestControllerV1;
  51 import org.onap.policy.pap.main.rest.PapAafFilter;
  52 import org.onap.policy.pap.main.rest.PapStatisticsManager;
  53 import org.onap.policy.pap.main.rest.PdpGroupCreateOrUpdateControllerV1;
  54 import org.onap.policy.pap.main.rest.PdpGroupDeleteControllerV1;
  55 import org.onap.policy.pap.main.rest.PdpGroupDeployControllerV1;
  56 import org.onap.policy.pap.main.rest.PdpGroupHealthCheckControllerV1;
  57 import org.onap.policy.pap.main.rest.PdpGroupQueryControllerV1;
  58 import org.onap.policy.pap.main.rest.PdpGroupStateChangeControllerV1;
  59 import org.onap.policy.pap.main.rest.PolicyStatusControllerV1;
  60 import org.onap.policy.pap.main.rest.PolicyUndeployerImpl;
  61 import org.onap.policy.pap.main.rest.StatisticsRestControllerV1;
  62
  63 /**
  64  * This class activates Policy Administration (PAP) as a complete service together with all its controllers, listeners &
  65  * handlers.
  66  *
  67  * @author Ram Krishna Verma (ram.krishna.verma@est.tech)
  68  */
  69 public class PapActivator extends ServiceManagerContainer {
  70     private static final String[] MSG_TYPE_NAMES = { "messageName" };
  71     private static final String[] REQ_ID_NAMES = { "response", "responseTo" };
  72
  73     /**
  74      * Max number of heat beats that can be missed before PAP removes a PDP.
  75      */
  76     private static final int MAX_MISSED_HEARTBEATS = 3;
  77
  78     private final PapParameterGroup papParameterGroup;
  79
  80     /**
  81      * Listens for messages on the topic, decodes them into a {@link PdpStatus} message, and then dispatches them to
  82      * {@link #reqIdDispatcher}.
  83      */
  84     private final MessageTypeDispatcher msgDispatcher;
  85
  86     /**
  87      * Listens for {@link PdpStatus} messages and then routes them to the listener associated with the ID of the
  88      * originating request.
  89      */
  90     private final RequestIdDispatcher<PdpStatus> reqIdDispatcher;
  91
  92     /**
  93      * Listener for anonymous {@link PdpStatus} messages either for registration or heartbeat.
  94      */
  95     private final PdpHeartbeatListener pdpHeartbeatListener;
  96
  97     /**
  98      * Instantiate the activator for policy pap as a complete service.
  99      *
 100      * @param papParameterGroup the parameters for the pap service
 101      */
 102     public PapActivator(final PapParameterGroup papParameterGroup) {
 103         super("Policy PAP");
 104
 105         TopicEndpointManager.getManager().addTopics(papParameterGroup.getTopicParameterGroup());
 106
 107         try {
 108             this.papParameterGroup = papParameterGroup;
 109             this.msgDispatcher = new MessageTypeDispatcher(MSG_TYPE_NAMES);
 110             this.reqIdDispatcher = new RequestIdDispatcher<>(PdpStatus.class, REQ_ID_NAMES);
 111             this.pdpHeartbeatListener = new PdpHeartbeatListener();
 112
 113         } catch (final RuntimeException e) {
 114             throw new PolicyPapRuntimeException(e);
 115         }
 116
 117         papParameterGroup.getRestServerParameters().setName(papParameterGroup.getName());
 118
 119         final Object pdpUpdateLock = new Object();
 120         final PdpParameters pdpParams = papParameterGroup.getPdpParameters();
 121         final AtomicReference<Publisher<PdpMessage>> pdpPub = new AtomicReference<>();
 122         final AtomicReference<Publisher<PolicyNotification>> notifyPub = new AtomicReference<>();
 123         final AtomicReference<TimerManager> pdpUpdTimers = new AtomicReference<>();
 124         final AtomicReference<TimerManager> pdpStChgTimers = new AtomicReference<>();
 125         final AtomicReference<TimerManager> heartBeatTimers = new AtomicReference<>();
 126         final AtomicReference<PolicyModelsProviderFactoryWrapper> daoFactory = new AtomicReference<>();
 127         final AtomicReference<PdpModifyRequestMap> requestMap = new AtomicReference<>();
 128         final AtomicReference<RestServer> restServer = new AtomicReference<>();
 129         final AtomicReference<PolicyNotifier> notifier = new AtomicReference<>();
 130
 131         // @formatter:off
 132         addAction("PAP parameters",
 133             () -> ParameterService.register(papParameterGroup),
 134             () -> ParameterService.deregister(papParameterGroup.getName()));
 135
 136         addAction("DAO Factory",
 137             () -> daoFactory.set(new PolicyModelsProviderFactoryWrapper(
 138                                     papParameterGroup.getDatabaseProviderParameters())),
 139             () -> daoFactory.get().close());
 140
 141         addAction("DAO Factory registration",
 142             () -> Registry.register(PapConstants.REG_PAP_DAO_FACTORY, daoFactory.get()),
 143             () -> Registry.unregister(PapConstants.REG_PAP_DAO_FACTORY));
 144
 145         addAction("Pdp Heartbeat Listener",
 146             () -> reqIdDispatcher.register(pdpHeartbeatListener),
 147             () -> reqIdDispatcher.unregister(pdpHeartbeatListener));
 148
 149         addAction("Request ID Dispatcher",
 150             () -> msgDispatcher.register(PdpMessageType.PDP_STATUS.name(), this.reqIdDispatcher),
 151             () -> msgDispatcher.unregister(PdpMessageType.PDP_STATUS.name()));
 152
 153         addAction("Message Dispatcher",
 154             this::registerMsgDispatcher,
 155             this::unregisterMsgDispatcher);
 156
 157         addAction("topics",
 158             TopicEndpointManager.getManager()::start,
 159             TopicEndpointManager.getManager()::shutdown);
 160
 161         addAction("PAP statistics",
 162             () -> Registry.register(PapConstants.REG_STATISTICS_MANAGER, new PapStatisticsManager()),
 163             () -> Registry.unregister(PapConstants.REG_STATISTICS_MANAGER));
 164
 165         addAction("PDP publisher",
 166             () -> {
 167                 pdpPub.set(new Publisher<>(PapConstants.TOPIC_POLICY_PDP_PAP));
 168                 startThread(pdpPub.get());
 169             },
 170             () -> pdpPub.get().stop());
 171
 172         addAction("Policy Notification publisher",
 173             () -> {
 174                 notifyPub.set(new Publisher<>(PapConstants.TOPIC_POLICY_NOTIFICATION));
 175                 startThread(notifyPub.get());
 176                 notifier.set(new PolicyNotifier(notifyPub.get(), daoFactory.get()));
 177             },
 178             () -> notifyPub.get().stop());
 179
 180         addAction("Policy Notifier",
 181             () -> Registry.register(PapConstants.REG_POLICY_NOTIFIER, notifier.get()),
 182             () -> Registry.unregister(PapConstants.REG_POLICY_NOTIFIER));
 183
 184         addAction("PDP heart beat timers",
 185             () -> {
 186                 long maxWaitHeartBeatMs = MAX_MISSED_HEARTBEATS * pdpParams.getHeartBeatMs();
 187                 heartBeatTimers.set(new TimerManager("heart beat", maxWaitHeartBeatMs));
 188                 startThread(heartBeatTimers.get());
 189             },
 190             () -> heartBeatTimers.get().stop());
 191
 192         addAction("PDP update timers",
 193             () -> {
 194                 pdpUpdTimers.set(new TimerManager("update", pdpParams.getUpdateParameters().getMaxWaitMs()));
 195                 startThread(pdpUpdTimers.get());
 196             },
 197             () -> pdpUpdTimers.get().stop());
 198
 199         addAction("PDP state-change timers",
 200             () -> {
 201                 pdpStChgTimers.set(new TimerManager("state-change", pdpParams.getUpdateParameters().getMaxWaitMs()));
 202                 startThread(pdpStChgTimers.get());
 203             },
 204             () -> pdpStChgTimers.get().stop());
 205
 206         addAction("PDP modification lock",
 207             () -> Registry.register(PapConstants.REG_PDP_MODIFY_LOCK, pdpUpdateLock),
 208             () -> Registry.unregister(PapConstants.REG_PDP_MODIFY_LOCK));
 209
 210         addAction("PDP modification requests",
 211             () -> {
 212                 requestMap.set(new PdpModifyRequestMap(
 213                             new PdpModifyRequestMapParams()
 214                                     .setDaoFactory(daoFactory.get())
 215                                     .setModifyLock(pdpUpdateLock)
 216                                     .setParams(pdpParams)
 217                                     .setPolicyNotifier(notifier.get())
 218                                     .setPdpPublisher(pdpPub.get())
 219                                     .setResponseDispatcher(reqIdDispatcher)
 220                                     .setStateChangeTimers(pdpStChgTimers.get())
 221                                     .setUpdateTimers(pdpUpdTimers.get())));
 222                 Registry.register(PapConstants.REG_PDP_MODIFY_MAP, requestMap.get());
 223
 224                 // now that it's registered, we can attach a "policy undeploy" provider
 225                 requestMap.get().setPolicyUndeployer(new PolicyUndeployerImpl());
 226             },
 227             () -> Registry.unregister(PapConstants.REG_PDP_MODIFY_MAP));
 228
 229         addAction("PDP heart beat tracker",
 230             () -> Registry.register(PapConstants.REG_PDP_TRACKER, PdpTracker.builder()
 231                                     .daoFactory(daoFactory.get())
 232                                     .timers(heartBeatTimers.get())
 233                                     .modifyLock(pdpUpdateLock)
 234                                     .requestMap(requestMap.get())
 235                                     .build()),
 236             () -> Registry.unregister(PapConstants.REG_PDP_TRACKER));
 237
 238         addAction("REST server",
 239             () -> {
 240                 RestServer server = new RestServer(papParameterGroup.getRestServerParameters(), PapAafFilter.class,
 241                                 HealthCheckRestControllerV1.class,
 242                                 StatisticsRestControllerV1.class,
 243                                 PdpGroupCreateOrUpdateControllerV1.class,
 244                                 PdpGroupDeployControllerV1.class,
 245                                 PdpGroupDeleteControllerV1.class,
 246                                 PdpGroupStateChangeControllerV1.class,
 247                                 PdpGroupQueryControllerV1.class,
 248                                 PdpGroupHealthCheckControllerV1.class,
 249                                 PolicyStatusControllerV1.class);
 250                 restServer.set(server);
 251                 restServer.get().start();
 252             },
 253             () -> restServer.get().stop());
 254         // @formatter:on
 255     }
 256
 257     /**
 258      * Starts a background thread.
 259      *
 260      * @param runner function to run in the background
 261      */
 262     private void startThread(final Runnable runner) {
 263         final Thread thread = new Thread(runner);
 264         thread.setDaemon(true);
 265
 266         thread.start();
 267     }
 268
 269     /**
 270      * Get the parameters used by the activator.
 271      *
 272      * @return the parameters of the activator
 273      */
 274     public PapParameterGroup getParameterGroup() {
 275         return papParameterGroup;
 276     }
 277
 278     /**
 279      * Registers the dispatcher with the topic source(s).
 280      */
 281     private void registerMsgDispatcher() {
 282         for (final TopicSource source : TopicEndpointManager.getManager()
 283                 .getTopicSources(Arrays.asList(PapConstants.TOPIC_POLICY_PDP_PAP))) {
 284             source.register(msgDispatcher);
 285         }
 286     }
 287
 288     /**
 289      * Unregisters the dispatcher from the topic source(s).
 290      */
 291     private void unregisterMsgDispatcher() {
 292         for (final TopicSource source : TopicEndpointManager.getManager()
 293                 .getTopicSources(Arrays.asList(PapConstants.TOPIC_POLICY_PDP_PAP))) {
 294             source.unregister(msgDispatcher);
 295         }
 296     }
 297 }