/*
 * Copyright (c) 2015 Brocade Communications Systems, Inc. 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.cluster.datastore.entityownership;

import akka.actor.ActorRef;
import akka.dispatch.OnComplete;
import akka.util.Timeout;
import java.util.concurrent.TimeUnit;
import org.opendaylight.controller.cluster.datastore.DistributedDataStore;
import org.opendaylight.controller.cluster.datastore.messages.CreateShard;
import org.opendaylight.controller.md.sal.common.api.clustering.CandidateAlreadyRegisteredException;
import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipCandidate;
import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipCandidateRegistration;
import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListener;
import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListenerRegistration;
import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import scala.concurrent.Future;

/**
 * The distributed implementation of the EntityOwnershipService.
 *
 * @author Thomas Pantelis
 */
public class DistributedEntityOwnershipService implements EntityOwnershipService, AutoCloseable {
    private static final Logger LOG = LoggerFactory.getLogger(DistributedEntityOwnershipService.class);
    static final String ENTITY_OWNERSHIP_SHARD_NAME = "entity-ownership";
    private static final Timeout MESSAGE_TIMEOUT = new Timeout(1, TimeUnit.MINUTES);

    private final DistributedDataStore datastore;

    public DistributedEntityOwnershipService(DistributedDataStore datastore) {
        this.datastore = datastore;
    }

    public void start() {
        ActorRef shardManagerActor = datastore.getActorContext().getShardManager();

        CreateShard createShard = new CreateShard(ENTITY_OWNERSHIP_SHARD_NAME,
                datastore.getActorContext().getConfiguration().getUniqueMemberNamesForAllShards(),
                new EntityOwnershipShardPropsCreator(), null);

        Future<Object> createFuture = datastore.getActorContext().executeOperationAsync(shardManagerActor,
                createShard, MESSAGE_TIMEOUT);

        createFuture.onComplete(new OnComplete<Object>() {
            @Override
            public void onComplete(Throwable failure, Object response) {
                if(failure != null) {
                    LOG.error("Failed to create {} shard", ENTITY_OWNERSHIP_SHARD_NAME);
                } else {
                    LOG.info("Successfully created {} shard", ENTITY_OWNERSHIP_SHARD_NAME);
                }
            }
        }, datastore.getActorContext().getClientDispatcher());
    }

    @Override
    public EntityOwnershipCandidateRegistration registerCandidate(Entity entity, EntityOwnershipCandidate candidate)
            throws CandidateAlreadyRegisteredException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public EntityOwnershipListenerRegistration registerListener(Entity entity, EntityOwnershipListener listener) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void close() {
    }
}