gerrit.onap Code Review - ccsdk/oran.git/blob

   1 /*-
   2  * ========================LICENSE_START=================================
   3  * ONAP : ccsdk oran
   4  * ======================================================================
   5  * Copyright (C) 2019-2020 Nordix Foundation. 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.onap.ccsdk.oran.a1policymanagementservice.tasks;
  22
  23 import static org.onap.ccsdk.oran.a1policymanagementservice.repository.Ric.RicState;
  24
  25 import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1Client;
  26 import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1ClientFactory;
  27 import org.onap.ccsdk.oran.a1policymanagementservice.clients.AsyncRestClientFactory;
  28 import org.onap.ccsdk.oran.a1policymanagementservice.controllers.ServiceCallbacks;
  29 import org.onap.ccsdk.oran.a1policymanagementservice.repository.ImmutablePolicyType;
  30 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Lock.LockType;
  31 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policies;
  32 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policy;
  33 import org.onap.ccsdk.oran.a1policymanagementservice.repository.PolicyType;
  34 import org.onap.ccsdk.oran.a1policymanagementservice.repository.PolicyTypes;
  35 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Ric;
  36 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Services;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39
  40 import reactor.core.publisher.BaseSubscriber;
  41 import reactor.core.publisher.Flux;
  42 import reactor.core.publisher.Mono;
  43 import reactor.core.publisher.SignalType;
  44
  45 /**
  46  * Synchronizes the content of a Near-RT RIC with the content in the repository.
  47  * This means:
  48  * <p>
  49  * load all policy types
  50  * <p>
  51  * send all policy instances to the Near-RT RIC
  52  * <p>
  53  * if that fails remove all policy instances
  54  * <p>
  55  * Notify subscribing services
  56  */
  57 @SuppressWarnings("squid:S2629") // Invoke method(s) only conditionally
  58 public class RicSynchronizationTask {
  59
  60     private static final Logger logger = LoggerFactory.getLogger(RicSynchronizationTask.class);
  61     static final int CONCURRENCY_RIC = 1; // How many paralell requests that is sent to one NearRT RIC
  62
  63     private final A1ClientFactory a1ClientFactory;
  64     private final PolicyTypes policyTypes;
  65     private final Policies policies;
  66     private final Services services;
  67     private final AsyncRestClientFactory restClientFactory;
  68
  69     public RicSynchronizationTask(A1ClientFactory a1ClientFactory, PolicyTypes policyTypes, Policies policies,
  70             Services services, AsyncRestClientFactory restClientFactory) {
  71         this.a1ClientFactory = a1ClientFactory;
  72         this.policyTypes = policyTypes;
  73         this.policies = policies;
  74         this.services = services;
  75         this.restClientFactory = restClientFactory;
  76     }
  77
  78     public void run(Ric ric) {
  79         logger.debug("Handling ric: {}", ric.getConfig().ricId());
  80
  81         if (ric.getState() == RicState.SYNCHRONIZING) {
  82             logger.debug("Ric: {} is already being synchronized", ric.getConfig().ricId());
  83             return;
  84         }
  85
  86         ric.getLock().lock(LockType.EXCLUSIVE) //
  87                 .flatMap(notUsed -> setRicState(ric)) //
  88                 .flatMap(lock -> this.a1ClientFactory.createA1Client(ric)) //
  89                 .flatMapMany(client -> runSynchronization(ric, client)) //
  90                 .onErrorResume(throwable -> deleteAllPolicyInstances(ric, throwable))
  91                 .subscribe(new BaseSubscriber<Object>() {
  92                     @Override
  93                     protected void hookOnError(Throwable throwable) {
  94                         logger.warn("Synchronization failure for ric: {}, reason: {}", ric.id(),
  95                                 throwable.getMessage());
  96                         ric.setState(RicState.UNAVAILABLE);
  97                     }
  98
  99                     @Override
 100                     protected void hookOnComplete() {
 101                         onSynchronizationComplete(ric);
 102                     }
 103
 104                     @Override
 105                     protected void hookFinally(SignalType type) {
 106                         ric.getLock().unlockBlocking();
 107                     }
 108                 });
 109     }
 110
 111     @SuppressWarnings("squid:S2445") // Blocks should be synchronized on "private final" fields
 112     private Mono<Ric> setRicState(Ric ric) {
 113         synchronized (ric) {
 114             if (ric.getState() == RicState.SYNCHRONIZING) {
 115                 logger.debug("Ric: {} is already being synchronized", ric.getConfig().ricId());
 116                 return Mono.empty();
 117             }
 118             ric.setState(RicState.SYNCHRONIZING);
 119             return Mono.just(ric);
 120         }
 121     }
 122
 123     private Flux<Object> runSynchronization(Ric ric, A1Client a1Client) {
 124         Flux<PolicyType> synchronizedTypes = synchronizePolicyTypes(ric, a1Client);
 125         Flux<?> policiesDeletedInRic = a1Client.deleteAllPolicies();
 126         Flux<Policy> policiesRecreatedInRic = recreateAllPoliciesInRic(ric, a1Client);
 127
 128         return Flux.concat(synchronizedTypes, policiesDeletedInRic, policiesRecreatedInRic);
 129     }
 130
 131     private void onSynchronizationComplete(Ric ric) {
 132         logger.debug("Synchronization completed for: {}", ric.id());
 133         ric.setState(RicState.AVAILABLE);
 134         notifyServices(ric);
 135     }
 136
 137     private Flux<Object> deleteAllPolicyInstances(Ric ric, Throwable t) {
 138         logger.debug("Recreation of policies failed for ric: {}, reason: {}", ric.id(), t.getMessage());
 139         deleteAllPoliciesInRepository(ric);
 140
 141         Flux<PolicyType> synchronizedTypes = this.a1ClientFactory.createA1Client(ric) //
 142                 .flatMapMany(a1Client -> synchronizePolicyTypes(ric, a1Client));
 143         Flux<?> deletePoliciesInRic = this.a1ClientFactory.createA1Client(ric) //
 144                 .flatMapMany(A1Client::deleteAllPolicies) //
 145                 .doOnComplete(() -> deleteAllPoliciesInRepository(ric));
 146
 147         return Flux.concat(synchronizedTypes, deletePoliciesInRic);
 148     }
 149
 150     void notifyServices(Ric ric) {
 151         ServiceCallbacks callbacks = new ServiceCallbacks(this.restClientFactory);
 152         callbacks.notifyServicesRicSynchronized(ric, services);
 153     }
 154
 155     private Flux<PolicyType> synchronizePolicyTypes(Ric ric, A1Client a1Client) {
 156         return a1Client.getPolicyTypeIdentities() //
 157                 .doOnNext(x -> ric.clearSupportedPolicyTypes()) //
 158                 .flatMapMany(Flux::fromIterable) //
 159                 .doOnNext(typeId -> logger.debug("For ric: {}, handling type: {}", ric.getConfig().ricId(), typeId)) //
 160                 .flatMap(policyTypeId -> getPolicyType(policyTypeId, a1Client), CONCURRENCY_RIC) //
 161                 .doOnNext(ric::addSupportedPolicyType); //
 162     }
 163
 164     private Mono<PolicyType> getPolicyType(String policyTypeId, A1Client a1Client) {
 165         if (policyTypes.contains(policyTypeId)) {
 166             return Mono.just(policyTypes.get(policyTypeId));
 167         }
 168         return a1Client.getPolicyTypeSchema(policyTypeId) //
 169                 .flatMap(schema -> createPolicyType(policyTypeId, schema));
 170     }
 171
 172     private Mono<PolicyType> createPolicyType(String policyTypeId, String schema) {
 173         PolicyType pt = ImmutablePolicyType.builder().id(policyTypeId).schema(schema).build();
 174         policyTypes.put(pt);
 175         return Mono.just(pt);
 176     }
 177
 178     private void deleteAllPoliciesInRepository(Ric ric) {
 179         for (Policy policy : policies.getForRic(ric.id())) {
 180             this.policies.remove(policy);
 181         }
 182     }
 183
 184     private Flux<Policy> putPolicy(Policy policy, Ric ric, A1Client a1Client) {
 185         logger.debug("Recreating policy: {}, for ric: {}", policy.id(), ric.getConfig().ricId());
 186         return a1Client.putPolicy(policy) //
 187                 .flatMapMany(notUsed -> Flux.just(policy));
 188     }
 189
 190     private boolean checkTransient(Policy policy) {
 191         if (policy.isTransient()) {
 192             this.policies.remove(policy);
 193         }
 194         return policy.isTransient();
 195     }
 196
 197     private Flux<Policy> recreateAllPoliciesInRic(Ric ric, A1Client a1Client) {
 198         return Flux.fromIterable(policies.getForRic(ric.id())) //
 199                 .filter(policy -> !checkTransient(policy)) //
 200                 .flatMap(policy -> putPolicy(policy, ric, a1Client), CONCURRENCY_RIC);
 201     }
 202
 203 }