renderers/faas/src/main/java/org/opendaylight/groupbasedpolicy/renderer/faas/FaasContractManagerListener.java

   1 /*
   2  * Copyright (c) 2015 Huawei Technologies and others. All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.groupbasedpolicy.renderer.faas;
  10
  11 import java.util.ArrayList;
  12 import java.util.List;
  13 import java.util.Map;
  14 import java.util.UUID;
  15 import java.util.concurrent.ConcurrentHashMap;
  16 import java.util.concurrent.ScheduledExecutorService;
  17
  18 import com.google.common.annotations.VisibleForTesting;
  19 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  20 import org.opendaylight.controller.md.sal.binding.api.DataChangeListener;
  21 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
  22 import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
  23 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
  24 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
  25 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  26 import org.opendaylight.faas.uln.datastore.api.UlnDatastoreApi;
  27 import org.opendaylight.groupbasedpolicy.util.DataStoreHelper;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.common.rev151013.Name;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.common.rev151013.Text;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.common.rev151013.Uuid;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.parameter.values.grouping.ParameterValue;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.parameter.values.grouping.ParameterValueBuilder;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.parameter.values.grouping.parameter.value.RangeValueBuilder;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.security.rule.groups.attributes.security.rule.groups.container.SecurityRuleGroupsBuilder;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.security.rule.groups.attributes.security.rule.groups.container.security.rule.groups.SecurityRuleGroup;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.security.rule.groups.attributes.security.rule.groups.container.security.rule.groups.SecurityRuleGroupBuilder;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.security.rule.groups.attributes.security.rule.groups.container.security.rule.groups.security.rule.group.SecurityRule;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.security.rule.groups.attributes.security.rule.groups.container.security.rule.groups.security.rule.group.SecurityRuleBuilder;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.security.rule.groups.attributes.security.rule.groups.container.security.rule.groups.security.rule.group.security.rule.RuleAction;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.security.rule.groups.attributes.security.rule.groups.container.security.rule.groups.security.rule.group.security.rule.RuleActionBuilder;
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.security.rule.groups.attributes.security.rule.groups.container.security.rule.groups.security.rule.group.security.rule.RuleClassifier;
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.security.rule.groups.attributes.security.rule.groups.container.security.rule.groups.security.rule.group.security.rule.RuleClassifier.Direction;
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.faas.logical.faas.security.rules.rev151013.security.rule.groups.attributes.security.rule.groups.container.security.rule.groups.security.rule.group.security.rule.RuleClassifierBuilder;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.common.rev140421.ActionName;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.common.rev140421.ClassifierName;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.common.rev140421.ContractId;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.common.rev140421.SubjectName;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.common.rev140421.TenantId;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.faas.rev151009.mapped.tenants.entities.mapped.entity.MappedContract;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.faas.rev151009.mapped.tenants.entities.mapped.entity.MappedContractBuilder;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.Tenants;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.has.action.refs.ActionRef;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.has.classifier.refs.ClassifierRef;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.Tenant;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.TenantKey;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.tenant.Policy;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.tenant.policy.Contract;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.tenant.policy.SubjectFeatureInstances;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.tenant.policy.contract.Clause;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.tenant.policy.contract.Subject;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.tenant.policy.contract.subject.Rule;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.tenant.policy.subject.feature.instances.ActionInstance;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.tenant.policy.subject.feature.instances.ActionInstanceKey;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.tenant.policy.subject.feature.instances.ClassifierInstance;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.tenants.tenant.policy.subject.feature.instances.ClassifierInstanceKey;
  66 import org.opendaylight.yangtools.yang.binding.DataObject;
  67 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  68 import org.slf4j.Logger;
  69 import org.slf4j.LoggerFactory;
  70
  71 import com.google.common.base.Optional;
  72
  73 public class FaasContractManagerListener implements DataChangeListener {
  74
  75     private static final Logger LOG = LoggerFactory.getLogger(FaasContractManagerListener.class);
  76     private ConcurrentHashMap<ContractId, Uuid> mappedContracts = new ConcurrentHashMap<>();
  77     private final ScheduledExecutorService executor;
  78     private final DataBroker dataProvider;
  79     private final TenantId gbpTenantId;
  80     private final Uuid faasTenantId;
  81
  82     public FaasContractManagerListener(DataBroker dataProvider, TenantId gbpTenantId, Uuid faasTenantId,
  83             ScheduledExecutorService executor) {
  84         this.executor = executor;
  85         this.gbpTenantId = gbpTenantId;
  86         this.faasTenantId = faasTenantId;
  87         this.dataProvider = dataProvider;
  88     }
  89
  90     @Override
  91     public void onDataChanged(final AsyncDataChangeEvent<InstanceIdentifier<?>, DataObject> change) {
  92         executor.execute(new Runnable() {
  93
  94             public void run() {
  95                 executeEvent(change);
  96             }
  97         });
  98     }
  99
 100     @VisibleForTesting
 101     void executeEvent(final AsyncDataChangeEvent<InstanceIdentifier<?>, DataObject> change) {
 102         // Create
 103         for (DataObject dao : change.getCreatedData().values()) {
 104             if (dao instanceof Contract) {
 105                 Contract contract = (Contract) dao;
 106                 LOG.debug("Contract {} is Created.", contract.getId().getValue());
 107                 UlnDatastoreApi.submitSecurityGroupsToDs(initSecurityGroupBuilder(contract).build());
 108             }
 109         }
 110         // Update
 111         Map<InstanceIdentifier<?>, DataObject> dao = change.getUpdatedData();
 112         for (Map.Entry<InstanceIdentifier<?>, DataObject> entry : dao.entrySet()) {
 113             if (entry.getValue() instanceof Contract) {
 114                 Contract contract = (Contract) entry.getValue();
 115                 LOG.debug("Contract {} is Updated.", contract.getId().getValue());
 116                 UlnDatastoreApi.submitSecurityGroupsToDs(initSecurityGroupBuilder(contract).build());
 117             }
 118         }
 119         // Remove
 120         for (InstanceIdentifier<?> iid : change.getRemovedPaths()) {
 121             DataObject old = change.getOriginalData().get(iid);
 122             if (old == null) {
 123                 continue;
 124             }
 125             if (old instanceof Contract) {
 126                 Contract contract = (Contract) old;
 127                 LOG.debug("Contract {} is removed.", contract.getId().getValue());
 128                 ReadWriteTransaction rwTx = dataProvider.newReadWriteTransaction();
 129                 Optional<MappedContract> op = DataStoreHelper.removeIfExists(LogicalDatastoreType.OPERATIONAL,
 130                         FaasIidFactory.mappedContractIid(gbpTenantId, contract.getId()), rwTx);
 131                 if (op.isPresent()) {
 132                     DataStoreHelper.submitToDs(rwTx);
 133                 }
 134                 Uuid val = mappedContracts.remove(contract.getId());
 135                 if (val != null) {
 136                     UlnDatastoreApi.removeSecurityGroupsFromDsIfExists(faasTenantId, val);
 137                 }
 138             }
 139         }
 140     }
 141
 142     public void loadAll(List<Contract> contracts, List<MappedContract> mpContracts) {
 143         if (mpContracts != null) {
 144             for (MappedContract mpContract : mpContracts) {
 145                 mappedContracts.putIfAbsent(mpContract.getGbpContractId(), mpContract.getFaasSecurityRulesId());
 146             }
 147         }
 148         if (contracts != null) {
 149             for (Contract contract : contracts) {
 150                 LOG.debug("Loading Contract {}", contract.getId().getValue());
 151                 UlnDatastoreApi.submitSecurityGroupsToDs(initSecurityGroupBuilder(contract).build());
 152             }
 153         }
 154     }
 155
 156     protected SecurityRuleGroupsBuilder initSecurityGroupBuilder(Contract contract) {
 157         LOG.trace("Start initSecurityGroupBuilder");
 158         SecurityRuleGroupsBuilder builder = new SecurityRuleGroupsBuilder();
 159         builder.setUuid(getFaasSecurityRulesId(contract.getId()));
 160         builder.setName(new Text(contract.getId().getValue()));
 161         if (contract.getDescription() != null)
 162             builder.setDescription(new Text("gbp-contract: " + contract.getDescription().getValue()));
 163         else
 164             builder.setDescription(new Text("gbp-contract"));
 165         builder.setTenantId(faasTenantId);
 166         builder.setSecurityRuleGroup(buildSecurityRuleGroup(contract));
 167         LOG.trace("Contract {} is mapped to Faas Security Rules {} ", contract.getId().getValue(), builder.getUuid()
 168             .getValue());
 169         return builder;
 170     }
 171
 172     private Uuid getFaasSecurityRulesId(ContractId contractId) {
 173         Uuid val = mappedContracts.get(contractId);
 174         if (val != null) {
 175             return val;
 176         }
 177         Uuid faasContractId = null;
 178         if (FaasPolicyManager.isUUid(contractId.getValue())) {
 179             faasContractId = new Uuid(contractId.getValue());
 180         } else {
 181             faasContractId = new Uuid(UUID.randomUUID().toString());
 182         }
 183         mappedContracts.putIfAbsent(contractId, faasContractId);
 184         val = mappedContracts.get(contractId);
 185         MappedContractBuilder builder = new MappedContractBuilder();
 186         builder.setFaasSecurityRulesId(val);
 187         builder.setGbpContractId(contractId);
 188         WriteTransaction wTx = dataProvider.newWriteOnlyTransaction();
 189         MappedContract result = builder.build();
 190         wTx.put(LogicalDatastoreType.OPERATIONAL,
 191                 FaasIidFactory.mappedContractIid(gbpTenantId, contractId), result);
 192         if (DataStoreHelper.submitToDs(wTx)) {
 193             LOG.debug("Cached in Datastore Mapped Contract {}", result);
 194         } else {
 195             LOG.error("Couldn't Cache in Datastore Mapped Contract {}", result);
 196         }
 197         return val;
 198     }
 199
 200     private List<SecurityRuleGroup> buildSecurityRuleGroup(Contract contract) {
 201         LOG.trace("Start buildSecurityRuleGroup for contract {}", contract.getId().getValue());
 202         List<SecurityRuleGroup> securityRuleGroups = new ArrayList<>();
 203         if (contract.getClause() == null) {
 204             LOG.debug("contract {} has no Clause", contract.getId().getValue());
 205             return null;
 206         }
 207         for (Clause clause : contract.getClause()) {
 208             if (clause.getSubjectRefs() == null) {
 209                 LOG.debug("Clause {} in contract {} has no Subject Ref", clause.getName().getValue(), contract.getId()
 210                     .getValue());
 211                 continue;
 212             }
 213             if (contract.getSubject() == null) {
 214                 LOG.warn("Couldn't find in Contract {} the expected subject references", contract.getId().getValue());
 215                 continue;
 216             }
 217             for (SubjectName subjectRef : clause.getSubjectRefs()) {
 218                 LOG.trace("Start Parsing Subject Ref {} in Contract {}", subjectRef, contract.getId().getValue());
 219                 for (Subject sub : contract.getSubject()) {
 220                     if (subjectRef.equals(sub.getName())) {
 221                         SecurityRuleGroupBuilder securityRuleGroupBuilder = new SecurityRuleGroupBuilder();
 222                         securityRuleGroupBuilder.setName(new Name(subjectRef.getValue()));
 223                         List<Rule> subRules = sub.getRule();
 224                         if (subRules == null) {
 225                             LOG.warn("Subject {} in Contract {} doesn't have rules", subjectRef.getValue(),
 226                                     contract.getId().getValue());
 227                         } else {
 228                             List<SecurityRule> securityRules = getSecurityRules(contract, subjectRef, subRules);
 229                             LOG.debug("Subject {} in Contract {} has {} rules", subjectRef.getValue(), contract.getId()
 230                                 .getValue(), securityRules.size());
 231                             securityRuleGroupBuilder.setSecurityRule(securityRules);
 232                         }
 233                         LOG.debug("Added Rule {} to Subject {} in Contract {}", securityRuleGroupBuilder.getName()
 234                             .getValue(), subjectRef.getValue(), contract.getId().getValue());
 235                         securityRuleGroups.add(securityRuleGroupBuilder.build());
 236                     }
 237                 }
 238             }
 239         }
 240         LOG.trace("Done with buildSecurityRuleGroup for contract {}", contract.getId().getValue());
 241         return securityRuleGroups;
 242     }
 243
 244     private List<SecurityRule> getSecurityRules(Contract contract, SubjectName subjectRef, List<Rule> subRules) {
 245         List<SecurityRule> securityRules = new ArrayList<>();
 246         for (Rule rule : subRules) {
 247             List<ClassifierRef> classifierRefs = rule.getClassifierRef();
 248             List<RuleClassifier> pClassifiers = null;
 249             if (classifierRefs == null || classifierRefs.isEmpty()) {
 250                 LOG.warn("Rule {} in Subject {} in Contract {} doesn't have classifiers", rule.getName(), subjectRef,
 251                         contract.getId());
 252             } else {
 253                 pClassifiers = getClassifiers(gbpTenantId, contract, classifierRefs, dataProvider);
 254                 if (pClassifiers == null || pClassifiers.isEmpty()) {
 255                     LOG.warn("Rule {} in Subject {} in Contract {} doesn't have classifiers -- Will ignore this rule",
 256                             rule.getName(), subjectRef, contract.getId());
 257                 }
 258             }
 259             List<ActionRef> actionRefs = rule.getActionRef();
 260             List<RuleAction> pActions = null;
 261             if (actionRefs == null || actionRefs.isEmpty()) {
 262                 LOG.warn("Rule {} in Subject {} in Contract {} doesn't have actions", rule.getName(), subjectRef,
 263                         contract.getId());
 264             } else {
 265                 pActions = getActions(contract, actionRefs);
 266                 if (pActions == null || pActions.isEmpty()) {
 267                     LOG.warn("Rule {} in Subject {} in Contract {} doesn't have actions", rule.getName(), subjectRef,
 268                             contract.getId());
 269                 }
 270             }
 271
 272             securityRules.add(new SecurityRuleBuilder().setName(new Name(rule.getName().getValue()))
 273                 .setOrder(rule.getOrder())
 274                 .setRuleClassifier(pClassifiers)
 275                 .setRuleAction(pActions)
 276                 .build());
 277         } // for rules
 278         return securityRules;
 279     }
 280
 281     private List<RuleAction> getActions(Contract contract, List<ActionRef> actionRefs) {
 282         LOG.trace("Start Parsing Actions for actionRefs count {} in Contract {}", actionRefs.size(), contract.getId()
 283             .getValue());
 284         List<RuleAction> pActions = new ArrayList<>();
 285         for (ActionRef actionRef : actionRefs) {
 286             if (actionRef.getName() == null) {
 287                 LOG.warn("Couldn't find an Action in Contract {} -- ignored Action", contract.getId().getValue());
 288                 continue;
 289             }
 290             RuleActionBuilder ruleActionBuilder = new RuleActionBuilder();
 291             ruleActionBuilder.setName(new Name(actionRef.getName().getValue()));
 292             ruleActionBuilder.setOrder(actionRef.getOrder());
 293             ActionInstance actionInstance = getActionInstance(actionRef.getName());
 294             if (actionInstance == null) {
 295                 LOG.warn("Action instance {} is not found -- will only use the Action ref info", actionRef.getName());
 296             } else {
 297                 if (actionInstance.getActionDefinitionId() != null) {
 298                     ruleActionBuilder.setAdditionalInfo(new Text(actionInstance.getActionDefinitionId().getValue()));
 299                 }
 300                 List<ParameterValue> parms = null;
 301                 if (actionInstance.getParameterValue() != null) {
 302                     LOG.trace("Action Instance {} has {} parameters", actionInstance.getName().getValue(),
 303                             actionInstance.getParameterValue().size());
 304                     parms = new ArrayList<>();
 305                     for (org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.subject.feature.instance.ParameterValue instance : actionInstance.getParameterValue()) {
 306                         ParameterValueBuilder pBuilder = new ParameterValueBuilder();
 307                         pBuilder.setIntValue(instance.getIntValue());
 308                         if (instance.getName() != null) {
 309                             pBuilder.setName(new Name(instance.getName().getValue()));
 310                         }
 311                         pBuilder.setStringValue(instance.getStringValue());
 312                         if (instance.getRangeValue() != null) {
 313                             RangeValueBuilder rBuilder = new RangeValueBuilder().setMax(
 314                                     instance.getRangeValue().getMax()).setMin(instance.getRangeValue().getMin());
 315                             pBuilder.setRangeValue(rBuilder.build());
 316                         }
 317                         ParameterValue parm = pBuilder.build();
 318                         LOG.trace("Added Parm {} from Action Instance {}", parm, actionInstance.getName().getValue());
 319                         parms.add(parm);
 320                     }
 321                 } else {
 322                     LOG.trace("Action Instance {} has no parameters", actionInstance.getName().getValue());
 323                 }
 324                 ruleActionBuilder.setParameterValue(parms);
 325             }
 326             pActions.add(ruleActionBuilder.build());
 327         }
 328
 329         return pActions;
 330     }
 331
 332     private ActionInstance getActionInstance(ActionName name) {
 333         ReadOnlyTransaction trans = dataProvider.newReadOnlyTransaction();
 334         InstanceIdentifier<ActionInstance> ciId = InstanceIdentifier.builder(Tenants.class)
 335             .child(Tenant.class, new TenantKey(gbpTenantId))
 336             .child(Policy.class)
 337             .child(SubjectFeatureInstances.class)
 338             .child(ActionInstance.class, new ActionInstanceKey(name))
 339             .build();
 340         try {
 341             Optional<ActionInstance> data = trans.read(LogicalDatastoreType.CONFIGURATION, ciId).get();
 342             if (data.isPresent()) {
 343                 return data.get();
 344             }
 345         } catch (Exception e) {
 346             LOG.error("Couldn't read Action instance from datastore. Exception: ", e);
 347         }
 348         return null;
 349     }
 350
 351     private List<RuleClassifier> getClassifiers(TenantId tenantId, Contract contract,
 352             List<ClassifierRef> classifierRefs, DataBroker dataProvider) {
 353         List<RuleClassifier> fClassifiers = new ArrayList<>();
 354         for (ClassifierRef classifierRef : classifierRefs) {
 355             if (classifierRef.getName() == null) {
 356                 LOG.warn("Found a Classifer without name in Contract {} ", contract.getId().getValue());
 357                 continue;
 358             }
 359             RuleClassifierBuilder ruleClassifierBuilder = new RuleClassifierBuilder();
 360             ruleClassifierBuilder.setName(new Name(classifierRef.getName().getValue()));
 361             ClassifierInstance classifierInstance = getClassifierInstance(tenantId, classifierRef.getName(),
 362                     dataProvider);
 363             if (classifierInstance == null) {
 364                 LOG.warn("Classifer instance {} is not found -- will only use the classifier Ref info",
 365                         classifierRef.getName());
 366             } else {
 367                 if (classifierInstance.getClassifierDefinitionId() != null) {
 368                     ruleClassifierBuilder.setAdditionalInfo(new Text(classifierInstance.getClassifierDefinitionId()
 369                         .getValue()));
 370                 }
 371                 List<ParameterValue> parms = null;
 372                 if (classifierInstance.getParameterValue() != null) {
 373                     LOG.trace("Calssifier Instance {} has {} parameters", classifierInstance.getName().getValue(),
 374                             classifierInstance.getParameterValue().size());
 375                     parms = new ArrayList<>();
 376                     for (org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.subject.feature.instance.ParameterValue instance : classifierInstance.getParameterValue()) {
 377                         ParameterValueBuilder pBuilder = new ParameterValueBuilder();
 378                         pBuilder.setIntValue(instance.getIntValue());
 379                         pBuilder.setName(new Name(instance.getName().getValue()));
 380                         pBuilder.setStringValue(instance.getStringValue());
 381                         if (instance.getRangeValue() != null) {
 382                             RangeValueBuilder rBuilder = new RangeValueBuilder().setMax(
 383                                     instance.getRangeValue().getMax()).setMin(instance.getRangeValue().getMin());
 384                             pBuilder.setRangeValue(rBuilder.build());
 385                         }
 386                         ParameterValue parm = pBuilder.build();
 387                         LOG.trace("Added parm {} from Classifier Instance {}", parm, classifierInstance.getName()
 388                             .getValue());
 389                         parms.add(parm);
 390                     }
 391                 } else {
 392                     LOG.trace("Classifier Instance {} has no parameters", classifierInstance.getName().getValue());
 393                 }
 394                 ruleClassifierBuilder.setParameterValue(parms);
 395             }
 396             if (classifierRef.getDirection() != null) {
 397                 ruleClassifierBuilder.setDirection(Direction.forValue(classifierRef.getDirection().getIntValue()));
 398             } else {
 399                 ruleClassifierBuilder.setDirection(Direction.Bidirectional);
 400             }
 401             fClassifiers.add(ruleClassifierBuilder.build());
 402         }
 403         return fClassifiers;
 404     }
 405
 406     private ClassifierInstance getClassifierInstance(TenantId tenantId, ClassifierName name, DataBroker dataProvider) {
 407         ReadOnlyTransaction trans = dataProvider.newReadOnlyTransaction();
 408         InstanceIdentifier<ClassifierInstance> ciId = InstanceIdentifier.builder(Tenants.class)
 409             .child(Tenant.class, new TenantKey(tenantId))
 410             .child(Policy.class)
 411             .child(SubjectFeatureInstances.class)
 412             .child(ClassifierInstance.class, new ClassifierInstanceKey(name))
 413             .build();
 414         try {
 415             Optional<ClassifierInstance> data = trans.read(LogicalDatastoreType.CONFIGURATION, ciId).get();
 416             if (data.isPresent()) {
 417                 return data.get();
 418             }
 419         } catch (Exception e) {
 420             LOG.error("Couldn't read Action instance from datastore. Exception: ", e);
 421         }
 422         return null;
 423     }
 424 }