gerrit.onap Code Review - policy/drools-pdp.git/blob

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * policy-management
   4  * ================================================================================
   5  * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 package org.openecomp.policy.drools.controller.internal;
  22
  23 import java.util.ArrayList;
  24 import java.util.Collection;
  25 import java.util.HashMap;
  26 import java.util.List;
  27 import java.util.Map;
  28
  29 import org.apache.commons.collections4.queue.CircularFifoQueue;
  30 import org.drools.core.ClassObjectFilter;
  31 import org.kie.api.runtime.KieSession;
  32 import org.kie.api.runtime.rule.FactHandle;
  33 import org.kie.api.runtime.rule.QueryResults;
  34 import org.kie.api.runtime.rule.QueryResultsRow;
  35 import org.openecomp.policy.common.logging.eelf.MessageCodes;
  36 import org.openecomp.policy.common.logging.flexlogger.FlexLogger;
  37 import org.openecomp.policy.common.logging.flexlogger.Logger;
  38 import org.openecomp.policy.drools.controller.DroolsController;
  39 import org.openecomp.policy.drools.core.PolicyContainer;
  40 import org.openecomp.policy.drools.core.PolicySession;
  41 import org.openecomp.policy.drools.core.jmx.PdpJmx;
  42 import org.openecomp.policy.drools.event.comm.TopicSink;
  43 import org.openecomp.policy.drools.protocol.coders.EventProtocolCoder;
  44 import org.openecomp.policy.drools.protocol.coders.JsonProtocolFilter;
  45 import org.openecomp.policy.drools.protocol.coders.TopicCoderFilterConfiguration;
  46 import org.openecomp.policy.drools.protocol.coders.TopicCoderFilterConfiguration.CustomGsonCoder;
  47 import org.openecomp.policy.drools.protocol.coders.TopicCoderFilterConfiguration.CustomJacksonCoder;
  48 import org.openecomp.policy.drools.protocol.coders.TopicCoderFilterConfiguration.PotentialCoderFilter;
  49 import org.openecomp.policy.drools.utils.ReflectionUtil;
  50
  51 import com.fasterxml.jackson.annotation.JsonIgnore;
  52
  53 /**
  54  * Maven-based Drools Controller that interacts with the
  55  * policy-core PolicyContainer and PolicySession to manage
  56  * Drools containers instantiated using Maven.
  57  */
  58 public class MavenDroolsController implements DroolsController {
  59
  60         /**
  61          * logger
  62          */
  63         private static Logger  logger = FlexLogger.getLogger(MavenDroolsController.class);
  64
  65         /**
  66          * Policy Container, the access object to the policy-core layer
  67          */
  68         @JsonIgnore
  69         protected final PolicyContainer policyContainer;
  70
  71         /**
  72          * alive status of this drools controller,
  73          * reflects invocation of start()/stop() only
  74          */
  75         protected volatile boolean alive = false;
  76
  77         /**
  78          * locked status of this drools controller,
  79          * reflects if i/o drools related operations are permitted,
  80          * more specifically: offer() and deliver().
  81          * It does not affect the ability to start and stop
  82          * underlying drools infrastructure
  83          */
  84         protected volatile boolean locked = false;
  85
  86         /**
  87          * list of topics, each with associated decoder classes, each
  88          * with a list of associated filters.
  89          */
  90         protected List<TopicCoderFilterConfiguration> decoderConfigurations;
  91
  92         /**
  93          * list of topics, each with associated encoder classes, each
  94          * with a list of associated filters.
  95          */
  96         protected List<TopicCoderFilterConfiguration> encoderConfigurations;
  97
  98         /**
  99          * recent source events processed
 100          */
 101         protected final CircularFifoQueue<Object> recentSourceEvents = new CircularFifoQueue<Object>(10);
 102
 103         /**
 104          * recent sink events processed
 105          */
 106         protected final CircularFifoQueue<String> recentSinkEvents = new CircularFifoQueue<String>(10);
 107
 108         /**
 109          * original Drools Model/Rules classloader hash
 110          */
 111         protected int modelClassLoaderHash;
 112
 113         /**
 114          * Expanded version of the constructor
 115          *
 116          * @param groupId maven group id
 117          * @param artifactId maven artifact id
 118          * @param version maven version
 119          * @param decoderConfiguration list of topic -> decoders -> filters mapping
 120          * @param encoderConfiguration list of topic -> encoders -> filters mapping
 121          *
 122          * @throws IllegalArgumentException invalid arguments passed in
 123          */
 124         public MavenDroolsController(String groupId,
 125                                                                  String artifactId,
 126                                                                  String version,
 127                                                                  List<TopicCoderFilterConfiguration> decoderConfigurations,
 128                                                                  List<TopicCoderFilterConfiguration> encoderConfigurations)
 129                    throws IllegalArgumentException {
 130
 131                 if (logger.isInfoEnabled())
 132                         logger.info("DROOLS CONTROLLER: instantiation " +  this +
 133                                             " -> {" + groupId + ":" + artifactId + ":" + version + "}");
 134
 135                 if (groupId == null || artifactId == null || version == null ||
 136                         groupId.isEmpty() || artifactId.isEmpty() || version.isEmpty()) {
 137                         throw new IllegalArgumentException("Missing maven coordinates: " +
 138                                                                    groupId + ":" + artifactId + ":" +
 139                                                                    version);
 140                 }
 141
 142                 this.policyContainer= new PolicyContainer(groupId, artifactId, version);
 143                 this.init(decoderConfigurations, encoderConfigurations);
 144
 145                 if (logger.isInfoEnabled())
 146                         logger.info("DROOLS CONTROLLER: instantiation completed " +  this);
 147         }
 148
 149         /**
 150          * init encoding/decoding configuration
 151          * @param decoderConfiguration list of topic -> decoders -> filters mapping
 152          * @param encoderConfiguration list of topic -> encoders -> filters mapping
 153          */
 154         protected void init(List<TopicCoderFilterConfiguration> decoderConfigurations,
 155                                     List<TopicCoderFilterConfiguration> encoderConfigurations) {
 156
 157                 this.decoderConfigurations = decoderConfigurations;
 158                 this.encoderConfigurations = encoderConfigurations;
 159
 160                 this.initCoders(decoderConfigurations, true);
 161                 this.initCoders(encoderConfigurations, false);
 162
 163                 this.modelClassLoaderHash = this.policyContainer.getClassLoader().hashCode();
 164         }
 165
 166         /**
 167          * {@inheritDoc}
 168          */
 169         @Override
 170         public void updateToVersion(String newGroupId, String newArtifactId, String newVersion,
 171                                             List<TopicCoderFilterConfiguration> decoderConfigurations,
 172                                             List<TopicCoderFilterConfiguration> encoderConfigurations)
 173                 throws IllegalArgumentException, LinkageError, Exception {
 174
 175                 if (logger.isInfoEnabled())
 176                         logger.info("UPDATE-TO-VERSION: " +  this + " -> {" + newGroupId + ":" + newArtifactId + ":" + newVersion + "}");
 177
 178                 if (newGroupId == null || newArtifactId == null || newVersion == null ||
 179                         newGroupId.isEmpty() || newArtifactId.isEmpty() || newVersion.isEmpty()) {
 180                                 throw new IllegalArgumentException("Missing maven coordinates: " +
 181                                                                            newGroupId + ":" + newArtifactId + ":" +
 182                                                                            newVersion);
 183                 }
 184
 185                 if (newGroupId.equalsIgnoreCase(DroolsController.NO_GROUP_ID) ||
 186                         newArtifactId.equalsIgnoreCase(DroolsController.NO_ARTIFACT_ID) ||
 187                         newVersion.equalsIgnoreCase(DroolsController.NO_VERSION)) {
 188                                 throw new IllegalArgumentException("BRAINLESS maven coordinates provided: " +
 189                                                                            newGroupId + ":" + newArtifactId + ":" +
 190                                                                            newVersion);
 191                 }
 192
 193                 if (newGroupId.equalsIgnoreCase(this.getGroupId()) &&
 194                         newArtifactId.equalsIgnoreCase(this.getArtifactId()) &&
 195                         newVersion.equalsIgnoreCase(this.getVersion())) {
 196                                 logger.warn("Al in the right version: " + newGroupId + ":" +
 197                                         newArtifactId + ":" +  newVersion + " vs. " + this);
 198                                 return;
 199                 }
 200
 201                 if (!newGroupId.equalsIgnoreCase(this.getGroupId()) ||
 202                         !newArtifactId.equalsIgnoreCase(this.getArtifactId())) {
 203                                 throw new IllegalArgumentException("Group ID and Artifact ID maven coordinates must be identical for the upgrade: " +
 204                                                                                newGroupId + ":" + newArtifactId + ":" +
 205                                                                                newVersion + " vs. " + this);
 206                 }
 207
 208                 /* upgrade */
 209                 String messages = this.policyContainer.updateToVersion(newVersion);
 210                 if (logger.isWarnEnabled())
 211                         logger.warn(this + "UPGRADE results: " + messages);
 212
 213                 /*
 214                  * If all sucessful (can load new container), now we can remove all coders from previous sessions
 215                  */
 216                 this.removeCoders();
 217
 218                 /*
 219                  * add the new coders
 220                  */
 221                 this.init(decoderConfigurations, encoderConfigurations);
 222
 223                 if (logger.isInfoEnabled())
 224                         logger.info("UPDATE-TO-VERSION: completed " +  this);
 225         }
 226
 227         /**
 228          * initialize decoders for all the topics supported by this controller
 229          * Note this is critical to be done after the Policy Container is
 230          * instantiated to be able to fetch the corresponding classes.
 231          *
 232          * @param decoderConfiguration list of topic -> decoders -> filters mapping
 233          */
 234         protected void initCoders(List<TopicCoderFilterConfiguration> coderConfigurations,
 235                                           boolean decoder)
 236                   throws IllegalArgumentException {
 237
 238                 if (logger.isInfoEnabled())
 239                         logger.info("INIT-CODERS: " +  this);
 240
 241                 if (coderConfigurations == null) {
 242                         return;
 243                 }
 244
 245
 246                 for (TopicCoderFilterConfiguration coderConfig: coderConfigurations) {
 247                         String topic = coderConfig.getTopic();
 248
 249                         CustomGsonCoder customGsonCoder = coderConfig.getCustomGsonCoder();
 250                         if (coderConfig.getCustomGsonCoder() != null &&
 251                                 coderConfig.getCustomGsonCoder().getClassContainer() != null &&
 252                                 !coderConfig.getCustomGsonCoder().getClassContainer().isEmpty()) {
 253
 254                                 String customGsonCoderClass = coderConfig.getCustomGsonCoder().getClassContainer();
 255                                 if (!ReflectionUtil.isClass(this.policyContainer.getClassLoader(),
 256                                                                    customGsonCoderClass)) {
 257                                         logger.error(customGsonCoderClass + " cannot be retrieved");
 258                                         throw new IllegalArgumentException(customGsonCoderClass + " cannot be retrieved");
 259                                 } else {
 260                                         if (logger.isInfoEnabled())
 261                                                 logger.info("CLASS FETCHED " + customGsonCoderClass);
 262                                 }
 263                         }
 264
 265                         CustomJacksonCoder customJacksonCoder = coderConfig.getCustomJacksonCoder();
 266                         if (coderConfig.getCustomJacksonCoder() != null &&
 267                                 coderConfig.getCustomJacksonCoder().getClassContainer() != null &&
 268                                 !coderConfig.getCustomJacksonCoder().getClassContainer().isEmpty()) {
 269
 270                                 String customJacksonCoderClass = coderConfig.getCustomJacksonCoder().getClassContainer();
 271                                 if (!ReflectionUtil.isClass(this.policyContainer.getClassLoader(),
 272                                                                    customJacksonCoderClass)) {
 273                                         logger.error(customJacksonCoderClass + " cannot be retrieved");
 274                                         throw new IllegalArgumentException(customJacksonCoderClass + " cannot be retrieved");
 275                                 } else {
 276                                         if (logger.isInfoEnabled())
 277                                                 logger.info("CLASS FETCHED " + customJacksonCoderClass);
 278                                 }
 279                         }
 280
 281                         List<PotentialCoderFilter> coderFilters = coderConfig.getCoderFilters();
 282                         if (coderFilters == null || coderFilters.isEmpty()) {
 283                                 continue;
 284                         }
 285
 286                         for (PotentialCoderFilter coderFilter : coderFilters) {
 287                                 String potentialCodedClass = coderFilter.getCodedClass();
 288                                 JsonProtocolFilter protocolFilter = coderFilter.getFilter();
 289
 290                                 if (!ReflectionUtil.isClass(this.policyContainer.getClassLoader(),
 291                                                                    potentialCodedClass)) {
 292                                         logger.error(potentialCodedClass + " cannot be retrieved");
 293                                         throw new IllegalArgumentException(potentialCodedClass + " cannot be retrieved");
 294                                 } else {
 295                                         if (logger.isInfoEnabled())
 296                                                 logger.info("CLASS FETCHED " + potentialCodedClass);
 297                                 }
 298
 299                                 if (decoder)
 300                                         EventProtocolCoder.manager.addDecoder(this.getGroupId(), this.getArtifactId(),
 301                                                                                       topic, potentialCodedClass, protocolFilter,
 302                                                                                       customGsonCoder,
 303                                                                                       customJacksonCoder,
 304                                                                                       this.policyContainer.getClassLoader().hashCode());
 305                                 else
 306                                         EventProtocolCoder.manager.addEncoder(this.getGroupId(), this.getArtifactId(),
 307                                                           topic, potentialCodedClass, protocolFilter,
 308                                                                                       customGsonCoder,
 309                                                                                       customJacksonCoder,
 310                                                                                       this.policyContainer.getClassLoader().hashCode());
 311                         }
 312                 }
 313         }
 314
 315
 316         /**
 317          * remove decoders.
 318          */
 319         protected void removeDecoders()
 320                   throws IllegalArgumentException {
 321                 if (logger.isInfoEnabled())
 322                         logger.info("REMOVE-DECODERS: " +  this);
 323
 324                 if (this.decoderConfigurations == null) {
 325                         return;
 326                 }
 327
 328
 329                 for (TopicCoderFilterConfiguration coderConfig: decoderConfigurations) {
 330                         String topic = coderConfig.getTopic();
 331                         EventProtocolCoder.manager.removeDecoders
 332                                                 (this.getGroupId(), this.getArtifactId(), topic);
 333                 }
 334         }
 335
 336         /**
 337          * remove decoders.
 338          */
 339         protected void removeEncoders()
 340                   throws IllegalArgumentException {
 341
 342                 if (logger.isInfoEnabled())
 343                         logger.info("REMOVE-ENCODERS: " +  this);
 344
 345                 if (this.encoderConfigurations == null)
 346                         return;
 347
 348
 349                 for (TopicCoderFilterConfiguration coderConfig: encoderConfigurations) {
 350                         String topic = coderConfig.getTopic();
 351                         EventProtocolCoder.manager.removeEncoders
 352                                                 (this.getGroupId(), this.getArtifactId(), topic);
 353                 }
 354         }
 355
 356
 357         /**
 358          * {@inheritDoc}
 359          */
 360         @Override
 361         public boolean ownsCoder(Class<? extends Object> coderClass, int modelHash) throws IllegalStateException {
 362                 if (!ReflectionUtil.isClass
 363                                 (this.policyContainer.getClassLoader(), coderClass.getCanonicalName())) {
 364                         logger.error(this + coderClass.getCanonicalName() + " cannot be retrieved. ");
 365                         return false;
 366                 }
 367
 368                 if (modelHash == this.modelClassLoaderHash) {
 369                         if (logger.isInfoEnabled())
 370                                 logger.info(coderClass.getCanonicalName() +
 371                                                     this + " class loader matches original drools controller rules classloader " +
 372                                         coderClass.getClassLoader());
 373                         return true;
 374                 } else {
 375                         if (logger.isWarnEnabled())
 376                                 logger.warn(this + coderClass.getCanonicalName() + " class loaders don't match  " +
 377                                 coderClass.getClassLoader() + " vs " +
 378                                                     this.policyContainer.getClassLoader());
 379                         return false;
 380                 }
 381         }
 382
 383         /**
 384          * {@inheritDoc}
 385          */
 386         @Override
 387         public boolean start() {
 388
 389                 if (logger.isInfoEnabled())
 390                         logger.info("START: " + this);
 391
 392                 synchronized (this) {
 393                         if (this.alive)
 394                                 return true;
 395
 396                         this.alive = true;
 397                 }
 398
 399                 return this.policyContainer.start();
 400         }
 401
 402         /**
 403          * {@inheritDoc}
 404          */
 405         @Override
 406         public boolean stop() {
 407
 408                 logger.info("STOP: " + this);
 409
 410                 synchronized (this) {
 411                         if (!this.alive)
 412                                 return true;
 413
 414                         this.alive = false;
 415                 }
 416
 417                 return this.policyContainer.stop();
 418         }
 419
 420
 421         /**
 422          * {@inheritDoc}
 423          */
 424         @Override
 425         public void shutdown() throws IllegalStateException {
 426
 427                 if (logger.isInfoEnabled())
 428                         logger.info(this + "SHUTDOWN");
 429
 430                 try {
 431                         this.stop();
 432                         this.removeCoders();
 433                 } catch (Exception e) {
 434                         logger.error(MessageCodes.EXCEPTION_ERROR, e, "stop", this.toString());
 435                 } finally {
 436                         this.policyContainer.shutdown();
 437                 }
 438
 439         }
 440
 441
 442         /**
 443          * {@inheritDoc}
 444          */
 445         @Override
 446         public void halt() throws IllegalStateException {
 447                 if (logger.isInfoEnabled())
 448                         logger.info(this + "SHUTDOWN");
 449
 450                 try {
 451                         this.stop();
 452                         this.removeCoders();
 453                 } catch (Exception e) {
 454                         logger.error(MessageCodes.EXCEPTION_ERROR, e, "halt", this.toString());
 455                 } finally {
 456                         this.policyContainer.destroy();
 457                 }
 458         }
 459
 460         /**
 461          * removes this drools controllers and encoders and decoders from operation
 462          */
 463         protected void removeCoders() {
 464
 465                 if (logger.isInfoEnabled())
 466                         logger.info(this + "REMOVE-CODERS");
 467
 468                 try {
 469                         this.removeDecoders();
 470                 } catch (IllegalArgumentException e) {
 471                         logger.error(MessageCodes.EXCEPTION_ERROR, e, "removeDecoders", this.toString());
 472                 }
 473
 474                 try {
 475                         this.removeEncoders();
 476                 } catch (IllegalArgumentException e) {
 477                         logger.error(MessageCodes.EXCEPTION_ERROR, e, "removeEncoders", this.toString());
 478                 }
 479         }
 480
 481         /**
 482          * {@inheritDoc}
 483          */
 484         @Override
 485         public boolean isAlive() {
 486                 return this.alive;
 487         }
 488
 489         /**
 490          * {@inheritDoc}
 491          */
 492         @Override
 493         public boolean offer(String topic, String event) {
 494
 495                 if (logger.isInfoEnabled())
 496                         logger.info("OFFER: " + topic + ":" + event + " INTO " + this);
 497
 498                 if (this.locked)
 499                         return true;
 500
 501                 if (!this.alive)
 502                         return true;
 503
 504                 // 0. Check if the policy container has any sessions
 505
 506                 if (this.policyContainer.getPolicySessions().size() <= 0) {
 507                         // no sessions
 508                         return true;
 509                 }
 510
 511                 // 1. Now, check if this topic has a decoder:
 512
 513                 if (!EventProtocolCoder.manager.isDecodingSupported(this.getGroupId(),
 514                                                                               this.getArtifactId(),
 515                                                                               topic)) {
 516
 517                         logger.warn("DECODING-UNSUPPORTED: " + ":" + this.getGroupId() +
 518                                                   ":" + this.getArtifactId() + ":" + topic + " IN " + this);
 519                         return true;
 520                 }
 521
 522                 // 2. Decode
 523
 524                 Object anEvent;
 525                 try {
 526                         anEvent = EventProtocolCoder.manager.decode(this.getGroupId(),
 527                                                                               this.getArtifactId(),
 528                                                                               topic,
 529                                                                               event);
 530                 } catch (UnsupportedOperationException uoe) {
 531                         if (logger.isInfoEnabled())
 532                                 logger.info("DECODE:"+ this + ":" + topic + ":" + event);
 533                         return true;
 534                 } catch (Exception e) {
 535                         e.printStackTrace();
 536                         logger.error("DECODE:"+ this + ":" + topic + ":" + event);
 537                         return true;
 538                 }
 539
 540                 synchronized(this.recentSourceEvents) {
 541                         this.recentSourceEvents.add(anEvent);
 542                 }
 543
 544                 // increment event count for Nagios monitoring
 545                 PdpJmx.getInstance().updateOccured();
 546
 547                 // Broadcast
 548
 549                 if (logger.isInfoEnabled())
 550                         logger.info(this + "BROADCAST-INJECT of " + event + " FROM " + topic + " INTO " + this.policyContainer.getName());
 551
 552                 if (!this.policyContainer.insertAll(anEvent))
 553                         logger.warn(this + "Failed to inject into PolicyContainer " + this.getSessionNames());
 554
 555                 return true;
 556         }
 557
 558         /**
 559          * {@inheritDoc}
 560          */
 561         @Override
 562         public boolean deliver(TopicSink sink, Object event)
 563                         throws IllegalArgumentException,
 564                                IllegalStateException,
 565                            UnsupportedOperationException {
 566
 567                 if (logger.isInfoEnabled())
 568                         logger.info(this + "DELIVER: " +  event + " FROM " + this + " TO " + sink);
 569
 570                 if (sink == null)
 571                         throw new IllegalArgumentException
 572                                                 (this +  " invalid sink");
 573
 574                 if (event == null)
 575                         throw new IllegalArgumentException
 576                                                 (this +  " invalid event");
 577
 578                 if (this.locked)
 579                         throw new IllegalStateException
 580                                                         (this +  " is locked");
 581
 582                 if (!this.alive)
 583                         throw new IllegalStateException
 584                                                         (this +  " is stopped");
 585
 586                 String json =
 587                                 EventProtocolCoder.manager.encode(sink.getTopic(), event, this);
 588
 589                 synchronized(this.recentSinkEvents) {
 590                         this.recentSinkEvents.add(json);
 591                 }
 592
 593                 return sink.send(json);
 594
 595         }
 596
 597         /**
 598          * {@inheritDoc}
 599          */
 600         @Override
 601         public String getVersion() {
 602                 return this.policyContainer.getVersion();
 603         }
 604
 605         /**
 606          * {@inheritDoc}
 607          */
 608         @Override
 609         public String getArtifactId() {
 610                 return this.policyContainer.getArtifactId();
 611         }
 612
 613         /**
 614          * {@inheritDoc}
 615          */
 616         @Override
 617         public String getGroupId() {
 618                 return this.policyContainer.getGroupId();
 619         }
 620
 621         /**
 622          * @return the modelClassLoaderHash
 623          */
 624         public int getModelClassLoaderHash() {
 625                 return modelClassLoaderHash;
 626         }
 627
 628         /**
 629          * {@inheritDoc}
 630          */
 631         @Override
 632         public synchronized boolean lock() {
 633                 logger.info("LOCK: " +  this);
 634
 635                 this.locked = true;
 636                 return true;
 637         }
 638
 639         /**
 640          * {@inheritDoc}
 641          */
 642         @Override
 643         public synchronized boolean unlock() {
 644                 logger.info("UNLOCK: " +  this);
 645
 646                 this.locked = false;
 647                 return true;
 648         }
 649
 650         /**
 651          * {@inheritDoc}
 652          */
 653         @Override
 654         public boolean isLocked() {
 655                 return this.locked;
 656         }
 657
 658         /**
 659          * gets the policy container
 660          * @return the underlying container
 661          */
 662         @JsonIgnore
 663         protected PolicyContainer getContainer() {
 664                 return this.policyContainer;
 665         }
 666
 667         /**
 668          * {@inheritDoc}
 669          */
 670         @Override
 671         public List<String> getSessionNames() {
 672                 return getSessionNames(true);
 673         }
 674
 675         /**
 676          * {@inheritDoc}
 677          */
 678         @Override
 679         public List<String> getCanonicalSessionNames() {
 680                 return getSessionNames(false);
 681         }
 682
 683         /**
 684          * get session names
 685          * @param abbreviated true for the short form, otherwise the long form
 686          * @return session names
 687          */
 688         protected List<String> getSessionNames(boolean abbreviated) {
 689                 List<String> sessionNames = new ArrayList<String>();
 690                 try {
 691                         for (PolicySession session: this.policyContainer.getPolicySessions()) {
 692                                 if (abbreviated)
 693                                         sessionNames.add(session.getName());
 694                                 else
 695                                         sessionNames.add(session.getFullName());
 696                         }
 697                 } catch (Exception e) {
 698                         logger.warn("Can't retrieve CORE sessions: " + e.getMessage(), e);
 699                         sessionNames.add(e.getMessage());
 700                 }
 701                 return sessionNames;
 702         }
 703
 704         /**
 705          * provides the underlying core layer container sessions
 706          *
 707          * @return the attached Policy Container
 708          */
 709         protected List<PolicySession> getSessions() {
 710                 List<PolicySession> sessions = new ArrayList<PolicySession>();
 711                 sessions.addAll(this.policyContainer.getPolicySessions());
 712                 return sessions;
 713         }
 714
 715         /**
 716          * provides the underlying core layer container session with name sessionName
 717          *
 718          * @param sessionName session name
 719          * @return the attached Policy Container
 720          * @throws IllegalArgumentException when an invalid session name is provided
 721          * @throws IllegalStateException when the drools controller is in an invalid state
 722          */
 723         protected PolicySession getSession(String sessionName) {
 724                 if (sessionName == null || sessionName.isEmpty())
 725                         throw new IllegalArgumentException("A Session Name must be provided");
 726
 727                 List<PolicySession> sessions = this.getSessions();
 728                 for (PolicySession session : sessions) {
 729                         if (sessionName.equals(session.getName()) || sessionName.equals(session.getName()))
 730                                 return session;
 731                 }
 732
 733                 throw new IllegalArgumentException("Invalid Session Name: " + sessionName);
 734         }
 735
 736         /**
 737          * {@inheritDoc}
 738          */
 739         @Override
 740         public Map<String,Integer> factClassNames(String sessionName) throws IllegalArgumentException {
 741                 if (sessionName == null || sessionName.isEmpty())
 742                         throw new IllegalArgumentException("Invalid Session Name: " + sessionName);
 743
 744                 // List<String> classNames = new ArrayList<>();
 745                 Map<String,Integer> classNames = new HashMap<>();
 746
 747                 PolicySession session = getSession(sessionName);
 748                 KieSession kieSession = session.getKieSession();
 749
 750                 Collection<FactHandle> facts = session.getKieSession().getFactHandles();
 751                 for (FactHandle fact : facts) {
 752                         try {
 753                                 String className = kieSession.getObject(fact).getClass().getName();
 754                                 if (classNames.containsKey(className))
 755                                         classNames.put(className, classNames.get(className) + 1);
 756                                 else
 757                                         classNames.put(className, 1);
 758                         } catch (Exception e) {
 759                                 if (logger.isInfoEnabled())
 760                                         logger.info("Object cannot be retrieved from fact: " + fact);
 761                         }
 762                 }
 763
 764                 return classNames;
 765         }
 766
 767         /**
 768          * {@inheritDoc}
 769          */
 770         @Override
 771         public long factCount(String sessionName) throws IllegalArgumentException {
 772                 if (sessionName == null || sessionName.isEmpty())
 773                         throw new IllegalArgumentException("Invalid Session Name: " + sessionName);
 774
 775                 PolicySession session = getSession(sessionName);
 776                 return session.getKieSession().getFactCount();
 777         }
 778
 779         /**
 780          * {@inheritDoc}
 781          */
 782         @Override
 783         public List<Object> facts(String sessionName, String className) {
 784                 if (sessionName == null || sessionName.isEmpty())
 785                         throw new IllegalArgumentException("Invalid Session Name: " + sessionName);
 786
 787                 if (className == null || className.isEmpty())
 788                         throw new IllegalArgumentException("Invalid Class Name: " + className);
 789
 790                 Class<?> factClass =
 791                                 ReflectionUtil.fetchClass(this.policyContainer.getClassLoader(), className);
 792                 if (factClass == null)
 793                         throw new IllegalArgumentException("Class cannot be fetched in model's classloader: " + className);
 794
 795                 PolicySession session = getSession(sessionName);
 796                 KieSession kieSession = session.getKieSession();
 797
 798                 List<Object> factObjects = new ArrayList<>();
 799
 800                 Collection<FactHandle> factHandles = kieSession.getFactHandles(new ClassObjectFilter(factClass));
 801                 for (FactHandle factHandle : factHandles) {
 802                         try {
 803                                 factObjects.add(kieSession.getObject(factHandle));
 804                         } catch (Exception e) {
 805                                 if (logger.isInfoEnabled())
 806                                         logger.info("Object cannot be retrieved from fact: " + factHandle);
 807                         }
 808                 }
 809
 810                 return factObjects;
 811         }
 812
 813         /**
 814          * {@inheritDoc}
 815          */
 816         @Override
 817         public List<Object> factQuery(String sessionName, String queryName, String queriedEntity) {
 818                 if (sessionName == null || sessionName.isEmpty())
 819                         throw new IllegalArgumentException("Invalid Session Name: " + sessionName);
 820
 821                 if (queryName == null || queryName.isEmpty())
 822                         throw new IllegalArgumentException("Invalid Query Name: " + queryName);
 823
 824                 if (queriedEntity == null || queriedEntity.isEmpty())
 825                         throw new IllegalArgumentException("Invalid Queried Entity: " + queriedEntity);
 826
 827                 PolicySession session = getSession(sessionName);
 828                 KieSession kieSession = session.getKieSession();
 829
 830                 List<Object> factObjects = new ArrayList<>();
 831
 832                 QueryResults queryResults = kieSession.getQueryResults(queryName);
 833                 for (QueryResultsRow row : queryResults) {
 834                         try {
 835                                 factObjects.add(row.get(queriedEntity));
 836                         } catch (Exception e) {
 837                                 if (logger.isInfoEnabled())
 838                                         logger.info("Object cannot be retrieved from fact: " + row);
 839                         }
 840                 }
 841
 842                 return factObjects;
 843         }
 844
 845         /**
 846          * {@inheritDoc}
 847          */
 848         @Override
 849         public Class<?> fetchModelClass(String className) throws IllegalStateException {
 850                 Class<?> modelClass =
 851                         ReflectionUtil.fetchClass(this.policyContainer.getClassLoader(), className);
 852                 return modelClass;
 853         }
 854
 855         /**
 856          * @return the recentSourceEvents
 857          */
 858         @Override
 859         public Object[] getRecentSourceEvents() {
 860                 synchronized(this.recentSourceEvents) {
 861                         Object[] events = new Object[recentSourceEvents.size()];
 862                         return recentSourceEvents.toArray(events);
 863                 }
 864         }
 865
 866         /**
 867          * @return the recentSinkEvents
 868          */
 869         @Override
 870         public String[] getRecentSinkEvents() {
 871                 synchronized(this.recentSinkEvents) {
 872                         String[] events = new String[recentSinkEvents.size()];
 873                         return recentSinkEvents.toArray(events);
 874                 }
 875         }
 876
 877
 878         /**
 879          * {@inheritDoc}
 880          */
 881         @Override
 882         public boolean isBrained() {
 883                 return true;
 884         }
 885
 886
 887         @Override
 888         public String toString() {
 889                 StringBuilder builder = new StringBuilder();
 890                 builder.append("MavenDroolsController [policyContainer=")
 891                        .append((policyContainer != null) ? policyContainer.getName() : "NULL").append(":")
 892                        .append(", alive=")
 893                            .append(alive).append(", locked=")
 894                            .append(", modelClassLoaderHash=").append(modelClassLoaderHash).append("]");
 895                 return builder.toString();
 896         }
 897
 898 }