--- /dev/null
+/*
+ * Copyright (c) 2021 PANTHEON.tech, s.r.o. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.eos.akka.registry.candidate;
+
+import akka.actor.typed.Behavior;
+import akka.actor.typed.javadsl.AbstractBehavior;
+import akka.actor.typed.javadsl.ActorContext;
+import akka.actor.typed.javadsl.Behaviors;
+import akka.actor.typed.javadsl.Receive;
+import akka.cluster.ddata.Key;
+import akka.cluster.ddata.ORMap;
+import akka.cluster.ddata.ORMapKey;
+import akka.cluster.ddata.ORSet;
+import akka.cluster.ddata.SelfUniqueAddress;
+import akka.cluster.ddata.typed.javadsl.DistributedData;
+import akka.cluster.ddata.typed.javadsl.Replicator;
+import akka.cluster.ddata.typed.javadsl.ReplicatorMessageAdapter;
+import org.opendaylight.controller.eos.akka.registry.candidate.command.CandidateRegistryCommand;
+import org.opendaylight.controller.eos.akka.registry.candidate.command.InternalUpdateResponse;
+import org.opendaylight.controller.eos.akka.registry.candidate.command.RegisterCandidate;
+import org.opendaylight.controller.eos.akka.registry.candidate.command.UnregisterCandidate;
+import org.opendaylight.mdsal.eos.dom.api.DOMEntity;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Actor responsible for handling registrations of candidates into distributed-data.
+ */
+public final class CandidateRegistry extends AbstractBehavior<CandidateRegistryCommand> {
+
+ private static final Logger LOG = LoggerFactory.getLogger(CandidateRegistry.class);
+
+ public static final Key<ORMap<DOMEntity, ORSet<String>>> KEY = new ORMapKey<>("candidateRegistry");
+
+ private final ReplicatorMessageAdapter<CandidateRegistryCommand, ORMap<DOMEntity, ORSet<String>>> replicatorAdapter;
+ private final SelfUniqueAddress node;
+
+ private CandidateRegistry(final ActorContext<CandidateRegistryCommand> context,
+ final ReplicatorMessageAdapter<CandidateRegistryCommand,
+ ORMap<DOMEntity, ORSet<String>>> replicatorAdapter) {
+ super(context);
+ this.replicatorAdapter = replicatorAdapter;
+
+ this.node = DistributedData.get(context.getSystem()).selfUniqueAddress();
+
+ LOG.debug("Candidate registry started");
+ }
+
+ public static Behavior<CandidateRegistryCommand> create() {
+ return Behaviors.setup(ctx ->
+ DistributedData.withReplicatorMessageAdapter(
+ (ReplicatorMessageAdapter<CandidateRegistryCommand,
+ ORMap<DOMEntity,ORSet<String>>> replicatorAdapter) ->
+ new CandidateRegistry(ctx, replicatorAdapter)));
+ }
+
+ @Override
+ public Receive<CandidateRegistryCommand> createReceive() {
+ return newReceiveBuilder()
+ .onMessage(RegisterCandidate.class, this::onRegisterCandidate)
+ .onMessage(UnregisterCandidate.class, this::onUnregisterCandidate)
+ .onMessage(InternalUpdateResponse.class, this::onInternalUpdateResponse)
+ .build();
+ }
+
+ private Behavior<CandidateRegistryCommand> onRegisterCandidate(final RegisterCandidate registerCandidate) {
+ LOG.debug("Registering candidate({}) for entity: {}",
+ registerCandidate.getCandidate(), registerCandidate.getEntity());
+ replicatorAdapter.askUpdate(
+ askReplyTo -> new Replicator.Update<>(
+ KEY,
+ ORMap.empty(),
+ Replicator.writeLocal(),
+ askReplyTo,
+ map -> map.update(node, registerCandidate.getEntity(), ORSet.empty(),
+ value -> value.add(node, registerCandidate.getCandidate()))),
+ InternalUpdateResponse::new);
+ return this;
+ }
+
+ private Behavior<CandidateRegistryCommand> onUnregisterCandidate(final UnregisterCandidate unregisterCandidate) {
+ LOG.debug("Removing candidate({}) from entity: {}",
+ unregisterCandidate.getCandidate(), unregisterCandidate.getEntity());
+ replicatorAdapter.askUpdate(
+ askReplyTo -> new Replicator.Update<>(
+ KEY,
+ ORMap.empty(),
+ Replicator.writeLocal(),
+ askReplyTo,
+ map -> map.update(node, unregisterCandidate.getEntity(), ORSet.empty(),
+ value -> value.remove(node, unregisterCandidate.getCandidate()))),
+ InternalUpdateResponse::new);
+ return this;
+ }
+
+ private Behavior<CandidateRegistryCommand> onInternalUpdateResponse(final InternalUpdateResponse updateResponse) {
+ LOG.debug("Received update response: {}", updateResponse.getRsp());
+ return this;
+ }
+}