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/*
 * Zeebe Broker Core
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */
package io.zeebe.broker.clustering.handler;

import io.zeebe.broker.Loggers;
import io.zeebe.broker.clustering.management.ClusterManager;
import io.zeebe.broker.transport.controlmessage.AbstractControlMessageHandler;
import io.zeebe.protocol.clientapi.ControlMessageType;
import io.zeebe.protocol.impl.BrokerEventMetadata;
import io.zeebe.transport.ServerOutput;
import io.zeebe.util.sched.ActorControl;
import io.zeebe.util.sched.future.ActorFuture;
import org.agrona.DirectBuffer;

public class RequestTopologyHandler extends AbstractControlMessageHandler
{
    protected final ClusterManager clusterManager;

    public RequestTopologyHandler(final ServerOutput output, final ClusterManager clusterManager)
    {
        super(output);
        this.clusterManager = clusterManager;
    }

    @Override
    public ControlMessageType getMessageType()
    {
        return ControlMessageType.REQUEST_TOPOLOGY;
    }

    @Override
    public void handle(final ActorControl actor, final int partitionId, final DirectBuffer buffer, final BrokerEventMetadata metadata)
    {
        final int requestStreamId = metadata.getRequestStreamId();
        final long requestId = metadata.getRequestId();

        final ActorFuture topologyActorFuture = clusterManager.requestTopology();
        actor.runOnCompletion(topologyActorFuture, ((topology, throwable) ->
        {
            if (throwable == null)
            {
                sendResponse(actor, requestStreamId, requestId, topology);
            }
            else
            {
                Loggers.CLUSTERING_LOGGER.debug("Problem on requesting topology. Exception {}", throwable);
                sendErrorResponse(actor, requestStreamId, requestId, "Cannot request topology");
            }
        }));
    }

}