Add first simple version of repository supervision

[nonrtric.git] / policy-agent / src / main / java / org / oransc / policyagent / tasks / RepositorySupervision.java

diff --git a/policy-agent/src/main/java/org/oransc/policyagent/tasks/RepositorySupervision.java b/policy-agent/src/main/java/org/oransc/policyagent/tasks/RepositorySupervision.java
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+++ b/policy-agent/src/main/java/org/oransc/policyagent/tasks/RepositorySupervision.java
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+/*-
+ * ========================LICENSE_START=================================
+ * O-RAN-SC
+ * %%
+ * Copyright (C) 2019 Nordix Foundation
+ * %%
+ * 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.oransc.policyagent.tasks;
+
+import org.oransc.policyagent.clients.A1Client;
+import org.oransc.policyagent.repository.Policies;
+import org.oransc.policyagent.repository.Ric;
+import org.oransc.policyagent.repository.Rics;
+import org.oransc.policyagent.repository.Ric.RicState;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.scheduling.annotation.EnableScheduling;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+/**
+ * Regularly checks the exisiting rics towards the local repository to keep it consistent.
+ */
+@Component
+@EnableScheduling
+public class RepositorySupervision {
+    private static final Logger logger = LoggerFactory.getLogger(RepositorySupervision.class);
+
+    private final Rics rics;
+    private final Policies policies;
+    private final A1Client a1Client;
+
+    @Autowired
+    public RepositorySupervision(Rics rics, Policies policies, A1Client a1Client) {
+        this.rics = rics;
+        this.policies = policies;
+        this.a1Client = a1Client;
+    }
+
+    /**
+     * Regularly contacts all Rics to check if they are alive.
+     */
+    @Scheduled(fixedRate = 1000 * 60)
+    public void checkAllRics() {
+        logger.debug("Checking Rics starting");
+        createTask().subscribe(this::onRicChecked, this::onError, this::onComplete);
+
+    }
+
+    private Flux<Ric> createTask() {
+        return Flux.fromIterable(rics.getRics()) //
+            .groupBy(ric -> ric.state()) //
+            .flatMap(fluxGroup -> handleGroup(fluxGroup.key(), fluxGroup));
+    }
+
+    private Flux<Ric> handleGroup(Ric.RicState key, Flux<Ric> fluxGroup) {
+        logger.debug("Handling group {}", key);
+        switch (key) {
+            case ACTIVE:
+                return fluxGroup.flatMap(this::checkActive);
+
+            case NOT_REACHABLE:
+                return fluxGroup.flatMap(this::checkNotReachable);
+
+            default:
+                // If not initiated, leave it to the StartupService.
+                return Flux.empty();
+        }
+    }
+
+    private Mono<Ric> checkActive(Ric ric) {
+        logger.debug("Handling active ric {}", ric);
+        a1Client.getPolicyIdentities(ric.getConfig().baseUrl()) //
+        .filter(policyId -> !policies.containsPolicy(policyId)) //
+        .doOnNext(policyId -> logger.debug("Deleting policy {}", policyId))
+        .flatMap(policyId -> a1Client.deletePolicy(ric.getConfig().baseUrl(), policyId)) //
+        .subscribe();
+        return Mono.just(ric);
+    }
+
+    private Mono<Ric> checkNotReachable(Ric ric) {
+        logger.debug("Handling not reachable ric {}", ric);
+        a1Client.getPolicyIdentities(ric.getConfig().baseUrl()) //
+        .filter(policyId -> !policies.containsPolicy(policyId)) //
+        .doOnNext(policyId -> logger.debug("Deleting policy {}", policyId))
+        .flatMap(policyId -> a1Client.deletePolicy(ric.getConfig().baseUrl(), policyId)) //
+        .subscribe(null, null, () -> ric.setState(RicState.ACTIVE));
+        return Mono.just(ric);
+    }
+
+    private void onRicChecked(Ric ric) {
+        logger.info("Ric: " + ric.name() + " checked");
+    }
+
+    private void onError(Throwable t) {
+        logger.error("Rics supervision failed", t);
+    }
+
+    private void onComplete() {
+        logger.debug("Checking Rics completed");
+    }
+
+}