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/*-
* ========================LICENSE_START=================================
* ONAP : ccsdk oran
* ======================================================================
* Copyright (C) 2019-2020 Nordix Foundation. All rights reserved.
* ======================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ========================LICENSE_END===================================
*/
package org.onap.ccsdk.oran.a1policymanagementservice.tasks;
import static org.onap.ccsdk.oran.a1policymanagementservice.repository.Ric.RicState;
import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1Client;
import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1ClientFactory;
import org.onap.ccsdk.oran.a1policymanagementservice.clients.AsyncRestClientFactory;
import org.onap.ccsdk.oran.a1policymanagementservice.controllers.ServiceCallbacks;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Lock.LockType;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policies;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policy;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.PolicyType;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.PolicyTypes;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Ric;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Rics;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Services;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.BaseSubscriber;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.core.publisher.SignalType;
/**
* Synchronizes the content of a Near-RT RIC with the content in the repository.
* This means:
* <p>
* load all policy types
* <p>
* send all policy instances to the Near-RT RIC
* <p>
* if that fails remove all policy instances
* <p>
* Notify subscribing services
*/
@SuppressWarnings("squid:S2629") // Invoke method(s) only conditionally
public class RicSynchronizationTask {
private static final Logger logger = LoggerFactory.getLogger(RicSynchronizationTask.class);
static final int CONCURRENCY_RIC = 1; // How many paralell requests that is sent to one NearRT RIC
private final A1ClientFactory a1ClientFactory;
private final PolicyTypes policyTypes;
private final Policies policies;
private final Services services;
private final Rics rics;
private final AsyncRestClientFactory restClientFactory;
public RicSynchronizationTask(A1ClientFactory a1ClientFactory, PolicyTypes policyTypes, Policies policies,
Services services, AsyncRestClientFactory restClientFactory, Rics rics) {
this.a1ClientFactory = a1ClientFactory;
this.policyTypes = policyTypes;
this.policies = policies;
this.services = services;
this.restClientFactory = restClientFactory;
this.rics = rics;
}
public void run(Ric ric) {
logger.debug("Ric synchronization task created: {}", ric.getConfig().ricId());
if (ric.getState() == RicState.SYNCHRONIZING) {
logger.debug("Ric: {} is already being synchronized", ric.getConfig().ricId());
return;
}
ric.getLock().lock(LockType.EXCLUSIVE, "RicSynchronizationTask") //
.flatMap(notUsed -> synchronizeRic(ric)) //
.subscribe(new BaseSubscriber<Object>() {
@Override
protected void hookFinally(SignalType type) {
ric.getLock().unlockBlocking();
}
});
}
public Mono<Ric> synchronizeRic(Ric ric) {
return setRicState(ric) //
.flatMap(lock -> this.a1ClientFactory.createA1Client(ric)) //
.flatMapMany(client -> runSynchronization(ric, client)) //
.onErrorResume(throwable -> deleteAllPolicyInstances(ric, throwable)) //
.collectList() //
.map(notUsed -> ric) //
.doOnError(t -> { //
logger.warn("Synchronization failure for ric: {}, reason: {}", ric.id(), t.getMessage()); //
ric.setState(RicState.UNAVAILABLE); //
}) //
.flatMap(notUsed -> onSynchronizationComplete(ric)) //
.onErrorResume(t -> Mono.just(ric));
}
public Flux<PolicyType> synchronizePolicyTypes(Ric ric, A1Client a1Client) {
return a1Client.getPolicyTypeIdentities() //
.doOnNext(x -> ric.clearSupportedPolicyTypes()) //
.flatMapMany(Flux::fromIterable) //
.doOnNext(typeId -> logger.debug("For ric: {}, handling type: {}", ric.getConfig().ricId(), typeId)) //
.flatMap(policyTypeId -> getPolicyType(policyTypeId, a1Client), CONCURRENCY_RIC) //
.doOnNext(ric::addSupportedPolicyType); //
}
@SuppressWarnings("squid:S2445") // Blocks should be synchronized on "private final" fields
private Mono<Ric> setRicState(Ric ric) {
synchronized (ric) {
if (ric.getState() == RicState.SYNCHRONIZING) {
logger.debug("Ric: {} is already being synchronized", ric.getConfig().ricId());
return Mono.empty();
}
logger.debug("Ric state set to SYNCHRONIZING: {}", ric.getConfig().ricId());
ric.setState(RicState.SYNCHRONIZING);
return Mono.just(ric);
}
}
private Flux<Object> runSynchronization(Ric ric, A1Client a1Client) {
Flux<PolicyType> synchronizedTypes = synchronizePolicyTypes(ric, a1Client);
Flux<?> policiesDeletedInRic = a1Client.deleteAllPolicies();
Flux<Policy> policiesRecreatedInRic = recreateAllPoliciesInRic(ric, a1Client);
return Flux.concat(synchronizedTypes, policiesDeletedInRic, policiesRecreatedInRic);
}
private Mono<Ric> onSynchronizationComplete(Ric ric) {
if (this.rics.get(ric.id()) == null) {
logger.debug("Policies removed in removed ric: {}", ric.id());
return Mono.empty();
}
logger.debug("Synchronization completed for: {}", ric.id());
ric.setState(RicState.AVAILABLE);
ServiceCallbacks callbacks = new ServiceCallbacks(this.restClientFactory);
return callbacks.notifyServicesRicAvailable(ric, services) //
.collectList() //
.map(list -> ric);
}
private Flux<Object> deleteAllPolicyInstances(Ric ric, Throwable t) {
logger.warn("Recreation of policies failed for ric: {}, reason: {}", ric.id(), t.getMessage());
deleteAllPoliciesInRepository(ric);
Flux<PolicyType> synchronizedTypes = this.a1ClientFactory.createA1Client(ric) //
.flatMapMany(a1Client -> synchronizePolicyTypes(ric, a1Client));
Flux<?> deletePoliciesInRic = this.a1ClientFactory.createA1Client(ric) //
.flatMapMany(A1Client::deleteAllPolicies) //
.doOnComplete(() -> deleteAllPoliciesInRepository(ric));
return Flux.concat(synchronizedTypes, deletePoliciesInRic);
}
private Mono<PolicyType> getPolicyType(String policyTypeId, A1Client a1Client) {
if (policyTypes.contains(policyTypeId)) {
return Mono.just(policyTypes.get(policyTypeId));
}
return a1Client.getPolicyTypeSchema(policyTypeId) //
.map(schema -> createPolicyType(policyTypeId, schema));
}
private PolicyType createPolicyType(String policyTypeId, String schema) {
PolicyType pt = PolicyType.builder().id(policyTypeId).schema(schema).build();
policyTypes.put(pt);
return pt;
}
private void deleteAllPoliciesInRepository(Ric ric) {
for (Policy policy : policies.getForRic(ric.id())) {
this.policies.remove(policy);
}
}
private Flux<Policy> putPolicy(Policy policy, Ric ric, A1Client a1Client) {
logger.trace("Recreating policy: {}, for ric: {}", policy.getId(), ric.getConfig().ricId());
return a1Client.putPolicy(policy) //
.flatMapMany(notUsed -> Flux.just(policy));
}
private boolean checkTransient(Policy policy) {
if (policy.isTransient()) {
this.policies.remove(policy);
}
return policy.isTransient();
}
private Flux<Policy> recreateAllPoliciesInRic(Ric ric, A1Client a1Client) {
return Flux.fromIterable(policies.getForRic(ric.id())) //
.doOnNext(policy -> logger.debug("Recreating policy: {}, ric: {}", policy.getId(), ric.id())) //
.filter(policy -> !checkTransient(policy)) //
.flatMap(policy -> putPolicy(policy, ric, a1Client), CONCURRENCY_RIC)
.doOnError(t -> logger.warn("Recreating policy failed, ric: {}, reason: {}", ric.id(), t.getMessage()));
}
}
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